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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0708.1449 | Hendrik Ulbricht | Sarayut Deachapunya, Paul J. Fagan, Andras G. Major, Elisabeth Reiger,
Helmut Ritsch, Andre Stefanov, Hendrik Ulbricht and Markus Arndt | Slow beams of massive molecules | 7 pages, 6 figures | Eur. Phys. J. D 46, 307 (2008) | 10.1140/epjd/e2007-00301-8 | null | quant-ph physics.atm-clus physics.bio-ph physics.chem-ph | null | Slow beams of neutral molecules are of great interest for a wide range of
applications, from cold chemistry through precision measurements to tests of
the foundations of quantum mechanics. We report on the quantitative observation
of thermal beams of perfluorinated macromolecules with masses up to 6000 amu,
reaching velocities down to 11 m/s. Such slow, heavy and neutral molecular
beams are of importance for a new class of experiments in matter-wave
interferometry and we also discuss the requirements for further manipulation
and cooling schemes with molecules in this unprecedented mass range.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:59:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Deachapunya",
"Sarayut",
""
],
[
"Fagan",
"Paul J.",
""
],
[
"Major",
"Andras G.",
""
],
[
"Reiger",
"Elisabeth",
""
],
[
"Ritsch",
"Helmut",
""
],
[
"Stefanov",
"Andre",
""
],
[
"Ulbricht",
"Hendrik",
""
],
[
"Arndt",
"Markus",
""
]
] |
0708.1450 | Francoise Heres-Renzetti | C. Trapes, V. Gadenne (L2MP), L. Roua\"i | Pi-Molecular dielectric layer for organic thin film diode | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Very thin (1.2-2.5nm) self-assembled organic dielectric monolayers have been
integrated into organic thin-film diode to achieve electrical characteristics.
These dielectrics are fabricated by self-assembling deposition, resulting in
smooth, strongly adherent, thermally stable, organosiloxane thin films having
interesting electrical capacitances (around 150 nF cm-2 at -3V) and insulating
properties (leakage current densities around 10-5 A cm2 at -1V).
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:09:38 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Trapes",
"C.",
"",
"L2MP"
],
[
"Gadenne",
"V.",
"",
"L2MP"
],
[
"Rouaï",
"L.",
""
]
] |
0708.1451 | Stephen King | R. Howl and S.F. King | Minimal E_6 Supersymmetric Standard Model | Minor corrections,32 pages, 2 figures | JHEP 0801:030,2008 | 10.1088/1126-6708/2008/01/030 | null | hep-ph | null | We propose a Minimal E_6 Supersymmetric Standard Model (ME$_6$SSM) which
allows Planck scale unification, provides a solution to the $\mu$ problem and
predicts a new Z'. Above the conventional GUT scale $M_{GUT}\sim 10^{16}$ GeV
the gauge group corresponds to a left-right symmetric Supersymmetric Pati-Salam
model, together with an additional $U(1)_{\psi}$ gauge group arising from an
E_6 gauge group broken near the Planck scale. Below $M_{GUT}$ the ME$_6$SSM
contains three reducible $\mathbf{27}$ representations of the Standard Model
gauge group together with an additional U(1)_X gauge group, consisting of a
novel and non-trivial linear combination of $U(1)_{\psi}$ and two Pati-Salam
generators, which is broken at the TeV scale by the same singlet which also
generates the effective $\mu$ term, resulting in a new low energy Z' gauge
boson. We discuss the phenomenology of the new Z' gauge boson in some detail.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:45:43 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 16:56:31 GMT"
},
{
"version": "v3",
"created": "Fri, 16 Nov 2007 15:35:42 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Howl",
"R.",
""
],
[
"King",
"S. F.",
""
]
] |
0708.1452 | Francoise Heres-Renzetti | J. Nunez, J.-M. Quintana, M.-J. Avedillo | Holding Dissapearance in RTD-based Quantizers | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Multiple-valued Logic (MVL) circuits are one of the most attractive
applications of the Monostable-to-Multistable transition Logic (MML), and they
are on the basis of advanced circuits for communications. The operation of such
quantizer has two steps : sampling and holding. Once the quantizer samples the
signal, it must maintain the sampled value even if the input changes. However,
holding property is not inherent to MML circuit topologies. This paper analyses
the case of an MML ternary inverter used as a quantizer, and determines the
relations that circuit representative parameters must verify to avoid this
malfunction.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:09:59 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Nunez",
"J.",
""
],
[
"Quintana",
"J. -M.",
""
],
[
"Avedillo",
"M. -J.",
""
]
] |
0708.1453 | Francoise Heres-Renzetti | P. Venkatesh Kumaran | Nano Calculators | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | The whole circuit is obtained from the sun through a molecule called
"Rhodopsin and bacteriorhodopsin". These molecules have the capability of
trapping and storing energy from the sun light. These molecules are placed on
the outer surface of the calculator to trap the energy and store it themselves
for latter usage. The thickness of the whole circuit measures less than
300nm.The top layer is made up of layer which will show the different keys and
a display unit. "Molecules are not only meant for compounding But also for
computing".
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:10:23 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Kumaran",
"P. Venkatesh",
""
]
] |
0708.1454 | Francoise Heres-Renzetti | F. Martorell, A. Rubio | Cell Architecture for Nanoelectronic Design | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Several nanoelectronic devices have been already proved. However, no
architecture which makes use of them provides a feasible opportunity to build
medium/large systems. Nanoarchitecture proposals only solve a small part of the
problems needed to achieve a real design. In this paper, we propose and analyze
a cell architecture that overcomes most of those at the gate level. Using the
cell structure we build 2 and 3-input NAND gates showing their error
probabilities. Finally, we outline a method to further improve the structure's
tolerance by taking advantage of interferences among nanodevices. Using this
improvement we show that it is possible to reduce the output standard deviation
by a factor larger than $\sqrt{2}$ and restitute the signal levels using
nanodevices.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:10:40 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Martorell",
"F.",
""
],
[
"Rubio",
"A.",
""
]
] |
0708.1455 | Francoise Heres-Renzetti | E. Kolonis (TIMA), M. Nicolaidis (TIMA) | Towards a Holistic CAD Platform for Nanotechnologies | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Silicon-based CMOS technologies are predicted to reach their ultimate limits
by the middle of the next decade. Research on nanotechnologies is actively
conducted, in a world-wide effort to develop new technologies able to maintain
the Moore's law. They promise revolutionizing the computing systems by
integrating tremendous numbers of devices at low cost. These trends will have a
profound impact on the architectures of computing systems and will require a
new paradigm of CAD. The paper presents a work in progress on this direction.
It is aimed at fitting requirements and constraints of nanotechnologies, in an
effort to achieve efficient use of the huge computing power promised by them.
To achieve this goal we are developing CAD tools able to exploit efficiently
these huge computing capabilities promised by nanotechnologies in the domain of
simulation of complex systems composed by huge numbers of relatively simple
elements.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:10:56 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Kolonis",
"E.",
"",
"TIMA"
],
[
"Nicolaidis",
"M.",
"",
"TIMA"
]
] |
0708.1456 | Francoise Heres-Renzetti | J.-M. Pingarron, P. Yanez-Sedeno, A. Gonzalez-Cortes, V. Carralero | Nanostructured Immunosensors. Application to the detection of
Progesterone | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | A novel nanostructured electrochemical immunsensor for the determination of
progesterone is reported. The approach combines the properties of gold
nanoparticles with the use of a graphite-Teflon composite electrode matrix,
into which gold nanoparticles are incorporated by simple physical inclusion.
The antibody anti-progesterone was directly attached to the electrode surface.
The immunosensor functioning is based on competitive assay between progesterone
and alkaline phosphatase-labelled progesterone. Monitoring of the affinity
reaction was accomplished by the electrochemical oxidation of 1-naphtol.
Modification of the graphite -Teflon electrode matrix with gold nanoparticles
improves substantially the electrooxidation response of 1-naphtol. Using a
detection potential of +0.3V, a detection limit for progesterone of 0.84 ng
ml-1 was obtained. Analysis of seven milk samples spiked at a 3.5 ng ml-1
progesterone concentration level yielded a mean recovery of 101+6%. Detection
of the antigen-antibody reaction with a graphite - Teflon - colloidal - gold -
Tyrosinase electrode, using phenylphosphate as alkaline phosphatase substrate
to generate phenol, which is subsequently reduced at -0.1 V at the composite
electrode, produced a high improvement in the sensitivity for progesterone
detection
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:11:39 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Pingarron",
"J. -M.",
""
],
[
"Yanez-Sedeno",
"P.",
""
],
[
"Gonzalez-Cortes",
"A.",
""
],
[
"Carralero",
"V.",
""
]
] |
0708.1457 | Francoise Heres-Renzetti | Valery A. Petrensko, S.-N. Ustino, I-Hsuan Chen | Fusion Phage as a Bioselective Nanomaterial : Evolution of the Concept | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Multibillion-clone landscape phage display libraries were prepared by the
fusion of the phage major coat protein pVIII with foreign random peptides.
Phage particles and their proteins specific for cancer and bacterial cells were
selected from the landscape libraries and exploited as molecular recognition
interfaces in detection, gene- and drug-delivery systems. The biorecognition
interfaces were obtained by incorporation of the cell-specific phage fusion
proteins into liposomes using intrinsic structural duplicity of the proteins.
As a paradigm, we incorporated targeted pVIII proteins into commercially
available therapeutic liposomes "Doxil", which acquired a new emergent
property-ability to bind target receptors. Targeting of the drug was evidenced
by fluorescence-activated cell sorting, microarray, optical and electron
microscopy. In contrast to a poorly controllable conjugation targeting, the new
landscape phage-based approach relies on very powerful and extremely precise
mechanisms of selection, biosynthesis and self assembly, in which phages
themselves serve as a source of the final product.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:11:57 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Petrensko",
"Valery A.",
""
],
[
"Ustino",
"S. -N.",
""
],
[
"Chen",
"I-Hsuan",
""
]
] |
0708.1458 | Francoise Heres-Renzetti | M. Hamdi (LVR), A. Ferreira (LVR) | DNA Nanorobotics | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | This paper presents a molecular mechanics study for new nanorobotic
structures using molecular dynamics (MD) simulations coupled to virtual reality
(VR) techniques. The operator can design and characterize through molecular
dynamics simulation the behavior of bionanorobotic components and structures
through 3-D visualization. The main novelty of the proposed simulations is
based on the mechanical characterization of passive/active robotic devices
based on double stranded DNA molecules. Their use as new DNA-based nanojoint
and nanotweezer are simulated and results discussed.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:12:22 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Hamdi",
"M.",
"",
"LVR"
],
[
"Ferreira",
"A.",
"",
"LVR"
]
] |
0708.1459 | Francoise Heres-Renzetti | S.-K. Sarkar, Souvik Sarkar, P.K. Sahu, K.-S. Kumar, S. Rani | To study the effects of degradation of phonon distribution on the high
frequency response in nano structures | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Under hot electron condition, the hot carriers phonon excited by ultra-short
pulses in polar semiconductors initially loose energy rapidly by emitting
longitudinal optic phonons via dominant Frolic coupling. Thus, energy supplied
to the carriers by high electric fields goes into phonon generation. As the
phonon life time is long enough, phonon distribution is disturbed and a non
equilibrium population of LO phonons or hot phonons are produced, leading to
their re-absorption by the carriers. In the present work the high frequency
performance of GaN nanostructures is studied in the framework of heated drifted
Fermi-Dirac distribution function incorporating the relevant scattering
mechanisms and the influence of non-equilibrium LO phonons. It is observed that
degradation of phonon distribution enhances significantly 3-dB cut off
frequency thereby makes the high frequency response flatter reflecting that
high frequency response is better if effects of non-equilibrium phonon
distributions are included in the calculations.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:12:41 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Sarkar",
"S. -K.",
""
],
[
"Sarkar",
"Souvik",
""
],
[
"Sahu",
"P. K.",
""
],
[
"Kumar",
"K. -S.",
""
],
[
"Rani",
"S.",
""
]
] |
0708.1460 | Herrera Ramon Dr | Sergio del Campo and Ramon Herrera | Warm inflation in the DGP brane-world model | 15 pages and 1 figure. Accepted for publication in Phys. Lett. B | Phys.Lett.B653:122-128,2007 | 10.1016/j.physletb.2007.08.007 | null | gr-qc astro-ph hep-th | null | Warm inflationary universe models on a warped Dvali-Gabadadze-Porrati brane
are studied. General conditions required for these models to be realizable are
derived and discussed. By using an effective exponential potential we develop
models for constant and variable dissipation coefficient ratio
$r=\frac{\Gamma}{3 H}$. We use recent astronomical observations for
constraining the parameters appearing in our models.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:21:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"del Campo",
"Sergio",
""
],
[
"Herrera",
"Ramon",
""
]
] |
0708.1461 | Francoise Heres-Renzetti | E.S. Vasilieva, O.V. Tolochko, V.E. Yudin, D. Kim, D.-W. Lee | Production and application of metal-based nanoparticles | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | A number of metal-based nanopowders such kinds as Fe, Co, Fe/Co alloy, Fe/C,
Fe/organic shell were successfully produced by aerosol synthesis method. The
mechanism of nanoparticles formation and the influence of experimental
parameters on shape, size distribution, structure, chemical and phase
composition of oxide-, carbon-, or organic- coated nanoparticles were
evaluated. The sizes of particles can be varied from 6-100 nm with narrow size
distribution. The several application fields of synthesized nanoparticles have
been studied.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:13:02 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Vasilieva",
"E. S.",
""
],
[
"Tolochko",
"O. V.",
""
],
[
"Yudin",
"V. E.",
""
],
[
"Kim",
"D.",
""
],
[
"Lee",
"D. -W.",
""
]
] |
0708.1462 | Francoise Heres-Renzetti | N.-C. Popa, A. Siblini (DIOM - Ea 3523), J.-J. Rousseau (DIOM - Ea
3523), M.-F. Blanc-Mignon (DIOM - Ea 3523), J.-P. Chatelon (DIOM - Ea 3523) | Structural Characterization of Magnetic Nano-particles Suspensions,
Using Magnetic Measurements | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | The paper describes some characteristics of the "P" curves for structural
characterization of magnetic nano-particles suspensions (complex fluids,
complex powders, complex composite materials, or living biological materials
having magnetic properties). In the case of these materials, the magnetic
properties are conferred to various carrier liquids by artificially integrating
in their structure ferromagnetic particles of different sizes. The magnetic
properties are usually shown by the hysteresis curve. The structure can be seen
on (electronic) micrography. The P curves offer another possibility to
determine the structure of the magnetic component of a complex fluid by
numerical analysis of the magnetization curve experimentally obtained. The
paper presents a detailed approach of the P curves and some limitations in
their use.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:13:19 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Popa",
"N. -C.",
"",
"DIOM - Ea 3523"
],
[
"Siblini",
"A.",
"",
"DIOM - Ea 3523"
],
[
"Rousseau",
"J. -J.",
"",
"DIOM - Ea\n 3523"
],
[
"Blanc-Mignon",
"M. -F.",
"",
"DIOM - Ea 3523"
],
[
"Chatelon",
"J. -P.",
"",
"DIOM - Ea 3523"
]
] |
0708.1463 | Walter Goldberger | Walter D. Goldberger, Benjamin Grinstein, Witold Skiba | Light scalar at LHC: the Higgs or the dilaton? | 7 pages, LaTeX | Phys.Rev.Lett.100:111802,2008 | 10.1103/PhysRevLett.100.111802 | UCSD-PTH/07-09 | hep-ph | null | It is likely that the LHC will observe a color- and charge-neutral scalar
whose decays are consistent with those of the Standard Model (SM) Higgs boson.
The Higgs interpretation of such a discovery is not the only possibility. For
example, electroweak symmetry breaking (EWSB) could be triggered by a
spontaneously broken, nearly conformal sector. The spectrum of states at the
electroweak scale would then contain a narrow scalar resonance, the
pseudo-Goldstone boson of conformal symmetry breaking, with Higgs-like
properties. If the conformal sector is strongly coupled, this pseudo-dilaton
may be the only new state accessible at high energy colliders. We discuss the
prospects for distinguishing this mode from a minimal Higgs boson at the LHC
and ILC. The main discriminants between the two scenarios are (1) cubic
self-interactions and (2) a potential enhancement of couplings to massless SM
gauge bosons. A particularly interesting situation arises when the scale f of
conformal symmetry breaking is approximately the electroweak scale v~246 GeV.
Although in this case the LHC may not be able to tell apart a pseudo-dilaton
from the Higgs boson, the self-interactions differ in a way that depends only
on the scaling dimension of certain operators in the conformal sector. This
opens the possibility of using dilaton pair production at future colliders as a
probe of EWSB induced by nearly conformal new physics.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:53:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Goldberger",
"Walter D.",
""
],
[
"Grinstein",
"Benjamin",
""
],
[
"Skiba",
"Witold",
""
]
] |
0708.1464 | Francoise Heres-Renzetti | E. Barborini, M. Leccardi, G. Bertolini, O. Rorato, P. Repetto, D.
Bandiera, M. Gatelli, A. Raso, A. Garibbo, L. Seminara, C. Ducati, P. Milani | Batch fabrication of cluster assembled microarrays for chemical sensing | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Deposition of clusters from the gas phase is becoming an enabling technology
for the production of nanostructured devices. Supersonic clusters beam
deposition (SCBD) has been shown as a viable route for the production of
nanostructured thin films. By using SCBD and by exploiting aerodynamical
effects typical of supersonic beams it is possible to obtain very high
deposition rates with a control on neutral cluster mass distribution, allowing
the deposition of thin films with tailored nanostructure. Due to high
deposition rates, high lateral resolution, low temperature processing, SCBD can
be used for the integration of cluster-assembled films on micro- and
nanofabricated platforms with limited or no post-growth processing. Here we
present the industrial opportunities for batch fabrication of gas sensor
microarrays based on transition metal oxide nanoparticles deposited on
microfabricated substrates.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:13:58 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Barborini",
"E.",
""
],
[
"Leccardi",
"M.",
""
],
[
"Bertolini",
"G.",
""
],
[
"Rorato",
"O.",
""
],
[
"Repetto",
"P.",
""
],
[
"Bandiera",
"D.",
""
],
[
"Gatelli",
"M.",
""
],
[
"Raso",
"A.",
""
],
[
"Garibbo",
"A.",
""
],
[
"Seminara",
"L.",
""
],
[
"Ducati",
"C.",
""
],
[
"Milani",
"P.",
""
]
] |
0708.1465 | Francoise Heres-Renzetti | P. Desgreys (LTCI), J. Gomes Da Silva (LTCI), D. Robert (LTCI) | Dispersion Impact on Ballistic CNTFET n+-i-n+ Performances | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | The designs integrating the promising carbon nanotube transistors (CNTFET)
will have to take into account the constraints implied by the strong dispersion
inherent to nanotube manufacturing. This paper proposes to characterize the
main CNTFET performances : on-current Ion, Ion/Ioff ratio and inverse
sub-threshold slope S according to the dispersion on the nanotube diameter. For
this purpose, we use a compact model suitable for testing several diameter
values.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:14:22 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Desgreys",
"P.",
"",
"LTCI"
],
[
"Da Silva",
"J. Gomes",
"",
"LTCI"
],
[
"Robert",
"D.",
"",
"LTCI"
]
] |
0708.1466 | Francoise Heres-Renzetti | S. Inoue, T. Nakajima, K. Nomura, Y. Kikuchi | Growth Mechanism and Selective Synthesis of SWNTs | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Ever since the landmark discovery of single-walled carbon nanotubes (SWNTs)
in 1993, they have been considered as ideal materials for any kind of
application based on their outstanding properties (e.g. mechanical strength,
thermal conductivity, ultra stability, etc.), and various techniques, including
laser furnace technique, arc discharge technique, and recently, Catalytic
Chemical Vapor Deposition (CCVD) technique, have been developed for the
high-quality macroscopic generation. Recently Hata et al. realized the
macroscopic production after great efforts of many scientists ; however, the
growth mechanisms are still unclear and this incomplete knowledge prevents us
from applying SWNTs to any fields. Here we can partially control the diameter
distribution of SWNTs using Alcohol Catalytic CVD (ACCVD) technique and well
combined catalysts. Their diameter is quite depend on the size of catalyst and
their species, that is why this can be a technique to control SWNTs, and
finally we propose the simple growth model.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:14:45 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Inoue",
"S.",
""
],
[
"Nakajima",
"T.",
""
],
[
"Nomura",
"K.",
""
],
[
"Kikuchi",
"Y.",
""
]
] |
0708.1467 | Francoise Heres-Renzetti | C.-J. Wu, C.-Y. Chou, C.-N. Han, K.-N. Chiang | Numerical Simulation of The Mechanical Properties of Carbon Nanotube
Using the Atomistic-Continuum Mechanics | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | This paper the utilizes atomistic-continuum mechanics (ACM) to investigate
the mechanical properties of single-walled carbon nanotubes (SWCNTs). By
establishing a linkage between structural mechanics and molecular mechanics,
not only the Young's moduli could be obtained but also the modal analysis could
be achieved. In addition, according to atomistic-continuum mechanics and finite
element method, an effective atomistic-continuum model is constructed to
investigate the above two mechanical properties of SWCNTs with affordable
computational time by personal computers. The validity of the results is
demonstrated by comparing them with existing results.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:15:17 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Wu",
"C. -J.",
""
],
[
"Chou",
"C. -Y.",
""
],
[
"Han",
"C. -N.",
""
],
[
"Chiang",
"K. -N.",
""
]
] |
0708.1468 | Francoise Heres-Renzetti | P. Hazdra, J. Voves, J. Oswald, K. Kuldova, A. Hospodkova, E.
Hulicius, J. Pangrac | Optical Characterisation of MOVPE Grown Vertically Correlated InAs/GaAs
Quantum Dots | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans European Nano Systems Worshop - ENS 2006, Paris : France
(2006) | null | null | cond-mat.mtrl-sci | null | Structures with self-organised InAs quantum dots in a GaAs matrix were grown
by the low pressure metal-organic vapour phase epitaxy (LP-MOVPE) technique.
Photoluminescence in combination with photomodulated reflectance spectroscopy
were used as the main characterisation methods for the growth optimisation.
Results show that photoreflectance spectroscopy is an excellent tool for
characterisation of QD structures wetting layers (thickness and composition)
and for identification of spacers in vertically stacked QDs structures.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:15:44 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Hazdra",
"P.",
""
],
[
"Voves",
"J.",
""
],
[
"Oswald",
"J.",
""
],
[
"Kuldova",
"K.",
""
],
[
"Hospodkova",
"A.",
""
],
[
"Hulicius",
"E.",
""
],
[
"Pangrac",
"J.",
""
]
] |
0708.1469 | Keun-young Kim | Keun-Young Kim, Sang-Jin Sin and Ismail Zahed | The Chiral Model of Sakai-Sugimoto at Finite Baryon Density | V3: 39 pages, 16 figures, minor corrections, version to appear in
JHEP. V2: references added, typos corrected | JHEP 0801:002,2008 | 10.1088/1126-6708/2008/01/002 | null | hep-th hep-ph | null | In the context of holographic QCD we analyze Sakai-Sugimoto's chiral model at
finite baryon density and zero temperature. The baryon number density is
introduced through compact D4 wrapping S^4 at the tip of D8-\bar{D8}. Each
baryon acts as a chiral point-like source distributed uniformly over R^3, and
leads a non-vanishing U(1)_V potential on the brane. For fixed baryon charge
density n_B we analyze the bulk energy density and pressure using the canonical
formalism. The baryonic matter with point like sources is always in the
spontaneously broken phase of chiral symmetry, whatever the density. The
point-like nature of the sources and large N_c cause the matter to be repulsive
as all baryon interactions are omega mediated. Through the induced DBI action
on D8-\bar{D8}, we study the effects of the fixed baryon charge density n_B on
the pion and vector meson masses and couplings. Issues related to vector
dominance in matter in the context of holographic QCD are also discussed.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:54:34 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 20:59:53 GMT"
},
{
"version": "v3",
"created": "Wed, 6 Feb 2008 01:48:14 GMT"
}
] | 2009-06-11T00:00:00 | [
[
"Kim",
"Keun-Young",
""
],
[
"Sin",
"Sang-Jin",
""
],
[
"Zahed",
"Ismail",
""
]
] |
0708.1470 | Karl R\"okaeus | Karl R\"okaeus | A note on the lambda-structure on the Burnside ring | 7 pages | null | null | null | math.GR | null | Let G be a finite group and let S be a G-set. The Burnside ring of G has a
natural structure of a lambda-ring. However, a priori the images of S under the
lambda-operations can only be computed implicitly. In this paper we establish
an explicit formula, expressing these images as linear combinations of classes
of G-sets.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:17:22 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Rökaeus",
"Karl",
""
]
] |
0708.1471 | Thomas D. Cohen | Danielle Allor, Thomas D. Cohen, David A. McGady | The Schwinger mechanism and graphene | Extensive revisions. The distinction between the vacuum decay rate
and the pair production rate in the Schwinger mechanism is now stressed. The
discussion of quality of sample needed for a viable experimental test has
been significantly expanded. References added | Phys.Rev.D78:096009,2008 | 10.1103/PhysRevD.78.096009 | null | cond-mat.mes-hall hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Schwinger mechanism, the production of charged particle-antiparticle
pairs in a macroscopic external electric field, is derived for 2+1 dimensional
theories. The rate of pair production per unit area for four species of
massless fermions, with charge $q$, in a constant electric field $E$ is given
by $ \pi^{-2} \hbar^{-3/2} \tilde{c}^{-1/2} (q E)^{3/2} $ where $\tilde{c}$ is
the speed of light for the two-dimensional system. To the extent undoped
graphene behaves like the quantum field-theoretic vacuum for massless fermions
in 2+1 dimensions, the Schwinger mechanism should be testable experimentally. A
possible experimental configuration for this is proposed. Effects due to
deviations from this idealized picture of graphene are briefly considered. It
is argued that with present day samples of graphene, tests of the Schwinger
formula may be possible.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:17:29 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 17:35:43 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Sep 2007 00:59:23 GMT"
},
{
"version": "v4",
"created": "Mon, 22 Sep 2008 13:30:27 GMT"
}
] | 2009-02-23T00:00:00 | [
[
"Allor",
"Danielle",
""
],
[
"Cohen",
"Thomas D.",
""
],
[
"McGady",
"David A.",
""
]
] |
0708.1472 | Michael Maziashvili | Michael Maziashvili | Operational definition of (brane induced) space-time and constraints on
the fundamental parameters | 9 pages | Phys.Lett.B666:364-370,2008 | 10.1016/j.physletb.2008.07.084 | null | hep-th gr-qc hep-ph | null | First we contemplate the operational definition of space-time in four
dimensions in light of basic principles of quantum mechanics and general
relativity and consider some of its phenomenological consequences. The quantum
gravitational fluctuations of the background metric that comes through the
operational definition of space-time are controlled by the Planck scale and are
therefore strongly suppressed. Then we extend our analysis to the braneworld
setup with low fundamental scale of gravity. It is observed that in this case
the quantum gravitational fluctuations on the brane may become unacceptably
large. The magnification of fluctuations is not linked directly to the low
quantum gravity scale but rather to the higher-dimensional modification of
Newton's inverse square law at relatively large distances. For models with
compact extra dimensions the shape modulus of extra space can be used as a most
natural and safe stabilization mechanism against these fluctuations.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:35:53 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Maziashvili",
"Michael",
""
]
] |
0708.1473 | Jochen M\"uller | Jochen M\"uller, P. Banzer, and S. Quabis, U. Peschel, G. Leuchs | Waveguide properties of single subwavelength holes demonstrated with
radially and azimuthally polarized light | null | null | null | null | physics.optics | null | We investigate the transmission of focused beams through single subwavelength
holes in a silver film. We use radially and azimuthally polarized light,
respectively, to excite higher order waveguide modes as well as to match the
radial symmetry of the aperture geometry. Remarkably, the transmission
properties can be described by a classical waveguide model even for thicknesses
of the silver film as thin as a quarter of a wavelength.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:56:05 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Müller",
"Jochen",
""
],
[
"Banzer",
"P.",
""
],
[
"Quabis",
"S.",
""
],
[
"Peschel",
"U.",
""
],
[
"Leuchs",
"G.",
""
]
] |
0708.1474 | Johannes Bluemlein | Johannes Bl\"umlein | The Status of the Polarized Parton Densities | Proceedings of 15th International Workshop on Deep-Inelastic
Scattering and Related Subjects (DIS2007), Munich, Germany, 16-20 Apr 2007, 6
pages | null | null | DESY 07-114, SFB/CPP-07-48 | hep-ph astro-ph hep-ex | null | A survey is given on the present knowledge of the polarized parton
distribution functions. We give an outlook for further developments desired
both on the theoretical as well on the experimental side to complete the
understanding of the spin--structure of nucleons in the future.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:30:40 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 06:57:28 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Blümlein",
"Johannes",
""
]
] |
0708.1475 | Gwilherm N \.enert | G. N\'enert, and T. T. M. Palstra | Prediction for new magnetoelectric fluorides | 12 pages, 4 figures, To appear in Journal of Physics: Condensed
Matter | null | 10.1088/0953-8984/19/40/406213 | null | cond-mat.mtrl-sci cond-mat.str-el | null | We use symmetry considerations in order to predict new magnetoelectric
fluorides. In addition to these magnetoelectric properties, we discuss among
these fluorides the ones susceptible to present multiferroic properties. We
emphasize that several materials present ferromagnetic properties. This
ferromagnetism should enhance the interplay between magnetic and dielectric
properties in these materials.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:34:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nénert",
"G.",
""
],
[
"Palstra",
"T. T. M.",
""
]
] |
0708.1476 | Emil Lundh | Emil Lundh | Mott transition in anharmonic confinement | 4 pages, 4 figures | null | 10.1140/epjd/e2008-00003-9 | null | cond-mat.other | null | Two effects are identified that affect the visibility of the Mott transition
in an atomic gas in an optical lattice confined in a power-law potential. The
transition can be made more pronounced by increasing the power law, but at the
same time, experimental uncertainty in the number of particles will induce
corresponding fluctuations in the measured condensate fraction. Calculations in
two dimensions indicate that a potential slightly more flat-bottomed than a
quadratic one is to be preferred for a wide range of particle number
fluctuation size.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:39:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lundh",
"Emil",
""
]
] |
0708.1477 | Suzanne Talon | Florian P. Pantillon, Suzanne Talon, Corinne Charbonnel | Angular momentum transport by internal gravity waves III - Wave
excitation by core convection and the Coriolis effect | 9 pages, 10 figures, accepted for publication by A&A | null | 10.1051/0004-6361:20078078 | null | astro-ph | null | This is the third in a series of papers that deal with angular momentum
transport by internal gravity waves. We concentrate on the waves excited by
core convection in a 3Msun, Pop I main sequence star. Here, we want to examine
the role of the Coriolis acceleration in the equations of motion that describe
the behavior of waves and to evaluate its impact on angular momentum transport.
We use the so-called traditional approximation of geophysics, which allows
variable separation in radial and horizontal components. In the presence of
rotation, the horizontal structure is described by Hough functions instead of
spherical harmonics. The Coriolis acceleration has two main effects on waves.
It transforms pure gravity waves into gravito-inertial waves that have a larger
amplitude closer to the equator, and it introduces new waves whose restoring
force is mainly the conservation of vorticity. Taking the Coriolis acceleration
into account changes the subtle balance between prograde and retrograde waves
in non-rotating stars. It also introduces new types of waves that are either
purely prograde or retrograde. We show in this paper where the local deposition
of angular momentum by such waves is important.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 15:44:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pantillon",
"Florian P.",
""
],
[
"Talon",
"Suzanne",
""
],
[
"Charbonnel",
"Corinne",
""
]
] |
0708.1478 | Aharon Levy | ZEUS Collaboration: S. Chekanov, et al | Exclusive rho^0 production in deep inelastic scattering at HERA | 58 pages, 31 figures, 12 tables, minor revisions, accepted for
publication in PMC Physics A | PMC Phys. A1:6,2007 | 10.1186/1754-0410-1-6 | DESY-07-118 | hep-ex | null | Exclusive rho^0 electroproduction at HERA has been studied with the ZEUS
detector using 120 pb^{-1} of integrated luminosity collected during 1996-2000.
The analysis was carried out in the kinematic range of photon virtuality 2 <
Q^2 < 160 GeV$^2, and gamma^* p centre-of-mass energy 32 < W < 180 GeV. The
results include the Q^2 and W dependence of the gamma^* p --> rho^0 p cross
section and the distribution of the squared-four-momentum transfer to the
proton. The helicity analysis of the decay-matrix elements of the rho^0 was
used to study the ratio of the gamma^* p cross section for longitudinal and
transverse photon as a function of Q^2 and W. Finally, an effective Pomeron
trajectory was extracted. The results are compared to various theoretical
predictions.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:23:51 GMT"
},
{
"version": "v2",
"created": "Tue, 13 Nov 2007 17:38:46 GMT"
}
] | 2010-03-17T00:00:00 | [
[
"ZEUS Collaboration",
"",
""
],
[
"Chekanov",
"S.",
""
]
] |
0708.1479 | Alexander Scholz | Jochen Eisloeffel and Alexander Scholz | The rotation of very low-mass stars and brown dwarfs | 8 pages, 5 figures, Proceedings for IAU Symposium No. 243, 2007,
'Star-disk interaction in young stars' | null | 10.1017/S174392130700960X | null | astro-ph | null | The evolution of angular momentum is a key to our understanding of star
formation and stellar evolution. The rotational evolution of solar-mass stars
is mostly controlled by magnetic interaction with the circumstellar disc and
angular momentum loss through stellar winds. Major differences in the internal
structure of very low-mass stars and brown dwarfs -- they are believed to be
fully convective throughout their lives, and thus should not operate a
solar-type dynamo -- may lead to major differences in the rotation and activity
of these objects. Here, we report on observational studies to understand the
rotational evolution of the very low-mass stars and brown dwarfs.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:03:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Eisloeffel",
"Jochen",
""
],
[
"Scholz",
"Alexander",
""
]
] |
0708.1480 | Jean-Louis Krivine | Jean-Louis Krivine (PPS), Yves Legrandg\'erard (PPS) | Valid formulas, games and network protocols | 12 pages | null | null | null | cs.LO | null | We describe a remarkable relation between the notion of valid formula of
predicate logic and the specification of network protocols. We give several
examples such as the acknowledgement of one packet or of a sequence of packets.
We show how to specify the composition of protocols.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:17:00 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Nov 2007 20:03:26 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Krivine",
"Jean-Louis",
"",
"PPS"
],
[
"Legrandgérard",
"Yves",
"",
"PPS"
]
] |
0708.1481 | Asia Rauf | Asia Rauf | Stanley Decompositions, Pretty Clean Filtrations and Reductions Modulo
Regular Elements | 7 pages | null | null | null | math.AC | null | We study the behavior of Stanley decompositions and of pretty clean
filtrations under reduction modulo a regular element.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:26:25 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Rauf",
"Asia",
""
]
] |
0708.1482 | Sohrab Rahvar | Reza Saffari, Sohrab Rahvar | f(R) Gravity: From the Pioneer Anomaly to the Cosmic Acceleration | 6 pages, 2 figures | Phys.Rev.D77:104028,2008 | 10.1103/PhysRevD.77.104028 | null | astro-ph gr-qc hep-th | null | We use metric formalism in $f(R)$ modified gravity to study the dynamics of
various systems from the solar system to the cosmological scale. we assume an
ansatz for the derivative of action as a function of distance and describe the
Pioneer anomaly and the flat rotation curve of the spiral galaxies. Having the
asymptotic behavior of action, we propose the action of $f(R) = (R + \Lambda)(1
+ \ln(R/R_c)/(R/R_0 + 2/\alpha))$ where in galactic and solar system scales it
can recover our desired form. The vacuum solution of this action also results
in a positive late time acceleration for the universe. We fix the parameters of
this model, comparing with the Pioneer anomaly, rotation curve of spiral
galaxies and Supernova Type Ia gold sample data.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:27:38 GMT"
},
{
"version": "v2",
"created": "Wed, 28 May 2008 03:41:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Saffari",
"Reza",
""
],
[
"Rahvar",
"Sohrab",
""
]
] |
0708.1483 | Maxim Budaev | Maxim Budaev | Memory in the system: trajectory-environment | 20 pages, 5 figures | null | null | null | physics.gen-ph | null | In the paper the memory effect in the system consisting from a trajectory of
process and an environment is considered. The environment is presented by
scalar potential and noise. The evolution of system is interpreted as process
of the continuous "measurement" of a trajectory by an environment and\or on the
contrary. In this sense the measured value is entropy-the information about
embedding of the trajectory into configurations space. The concepts
"measurement" and "interaction" are identified alike in quantum theory. Thus,
the entropy evolution is not only the effect of dynamics, but also its cause,
if it is possible to speak about causality in this case. It is shown, that such
non-elastic interaction leads to occurrence of memory in the system. The reflex
memory mechanism is realized as a real conformal dynamic metrics. The
metastable event (attractor) is defined and time of its life is estimated. It
is shown, that in the system there is a change of dynamic modes from spatial
localization to random walk (fluctuation, relaxation). On scale of the
attractors dynamics the memory is appearing as a semi-regular (in some
information sense) drift of the image of fluctuations in a power spectrum of
environment to absolute minimum. The latter properties (topological
convergence) attract the attention to algorithmic aspect of a considered
system.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:30:09 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Budaev",
"Maxim",
""
]
] |
0708.1484 | J. M. Taylor | J. M. Taylor | A quantum dot implementation of the quantum NAND algorithm | 5 pages, 3 figures | null | null | null | quant-ph cond-mat.mes-hall | null | We propose a physical implementation of the quantum NAND tree evaluation
algorithm. Our approach, based on continuous time quantum walks, uses the wave
interference of a single electron in a heirarchical set of tunnel coupled
quantum dots. We find that the query complexity of the NAND tree evaluation
does not suffer strongly from disorder and dephasing, nor is it directly
limited by temperature or restricted dimensionality for 2-d structures.
Finally, we suggest a potential application of this algorithm to the efficient
determination of high-order correlation functions of complex quantum systems.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:34:10 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Taylor",
"J. M.",
""
]
] |
0708.1485 | Rob Tibshirani | Jerome Friedman, Trevor Hastie, Holger H\"ofling, Robert Tibshirani | Pathwise coordinate optimization | Published in at http://dx.doi.org/10.1214/07-AOAS131 the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Statistics 2007, Vol. 1, No. 2, 302-332 | 10.1214/07-AOAS131 | IMS-AOAS-AOAS131 | stat.CO math.OC | null | We consider ``one-at-a-time'' coordinate-wise descent algorithms for a class
of convex optimization problems. An algorithm of this kind has been proposed
for the $L_1$-penalized regression (lasso) in the literature, but it seems to
have been largely ignored. Indeed, it seems that coordinate-wise algorithms are
not often used in convex optimization. We show that this algorithm is very
competitive with the well-known LARS (or homotopy) procedure in large lasso
problems, and that it can be applied to related methods such as the garotte and
elastic net. It turns out that coordinate-wise descent does not work in the
``fused lasso,'' however, so we derive a generalized algorithm that yields the
solution in much less time that a standard convex optimizer. Finally, we
generalize the procedure to the two-dimensional fused lasso, and demonstrate
its performance on some image smoothing problems.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:54:30 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Dec 2007 07:44:22 GMT"
}
] | 2007-12-18T00:00:00 | [
[
"Friedman",
"Jerome",
""
],
[
"Hastie",
"Trevor",
""
],
[
"Höfling",
"Holger",
""
],
[
"Tibshirani",
"Robert",
""
]
] |
0708.1486 | Leonhard Mayrhofer | Leonhard Mayrhofer, Milena Grifoni | The low energy spectrum of finite size metallic SWNTs | null | European Physical Journal B 63 (2008) 43-58 | 10.1140/epjb/e2008-00204-0 | null | cond-mat.mes-hall cond-mat.str-el | null | The electronic spectrum of metallic finite-size single-wall carbon nanotubes
at low energies is derived. It is based on a tight-binding description for the
interacting p_{z} electrons. Not only the forward scattering parts of the
Coulomb interaction, which are diagonalized by bosonization, are considered,
but also all other processes becoming relevant for small diameter tubes. As a
consequence of the substructure of the underlying lattice, a spin 1 triplet is
found as ground state if the exchange splitting is larger than the branch
mismatch, a spin 0 singlet otherwise. Moreover the excitation spectrum is
calculated.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 16:51:42 GMT"
}
] | 2008-07-31T00:00:00 | [
[
"Mayrhofer",
"Leonhard",
""
],
[
"Grifoni",
"Milena",
""
]
] |
0708.1487 | Pavel Etingof | Pavel Etingof and Shlomo Gelaki | Quasisymmetric and unipotent tensor categories | 8 pages, latex | null | null | null | math.QA math.CT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We classify braided tensor categories over C of exponential growth which are
quasisymmetric, i.e., the squared braiding is the identity on the product of
any two simple objects. This generalizes the classification results of Deligne
on symmetric categories of exponential growth, and of Drinfeld on
quasitriangular quasi-Hopf algebras. In particular, we classify braided
categories of exponential growth which are unipotent, i.e., those whose only
simple object is the unit object. We also classify fiber functors on such
categories. Finally, using the Etingof-Kazhdan quantization theory of Poisson
algebraic groups, we give a classification of coconnected Hopf algebras, i.e.
of unipotent categories of exponential growth with a fiber functor.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:01:05 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Jun 2009 16:47:32 GMT"
}
] | 2009-06-01T00:00:00 | [
[
"Etingof",
"Pavel",
""
],
[
"Gelaki",
"Shlomo",
""
]
] |
0708.1488 | Anton Andronic | A. Andronic, P. Braun-Munzinger, K. Redlich, J. Stachel | Charmonium and open charm production in nuclear collisions at SPS/FAIR
energies and the possible influence of a hot hadronic medium | 12 pages, 4 figures; v2: slightly revised text and updated
calculations; v3: slightly enhanced discussion, one more ref.; data file with
calculations will be available at
http://www-linux.gsi.de/~andronic/physics/charm/ | Phys.Lett.B659:149-155,2008 | 10.1016/j.physletb.2007.10.064 | null | nucl-th | null | We provide predictions for charmonium and open charm production in nuclear
collisions at SPS/FAIR energies within the framework of the statistical
hadronization model. The increasing importance at lower energies of Lambda_c
production is demonstrated and provides a challenge for future experiments. We
also demonstrate that, because of the large charm quark mass and the different
timescales for charm quark and charmed hadron production, possible
modifications of charmed hadrons in the hot hadronic medium do not lead to
measurable changes in cross sections for D-meson production. A possible
influence of medium effects can be seen, however, in yields of charmonium.
These effects are visible at all energies and results are presented for the
energy range between charm threshold and RHIC energy.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:06:14 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 18:18:30 GMT"
},
{
"version": "v3",
"created": "Fri, 26 Oct 2007 15:53:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Andronic",
"A.",
""
],
[
"Braun-Munzinger",
"P.",
""
],
[
"Redlich",
"K.",
""
],
[
"Stachel",
"J.",
""
]
] |
0708.1489 | Michael Mattes Dr. | M. Mattes and M. Sorg | Principle of Minimal Energy in Relativistic Schroedinger Theory | 65 pages | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamilton-Lagrange action principle for Relativistic Schr\"odinger Theory
(RST) is converted to a variational principle (with constraints) for the
stationary bound states. The groundstate energy is the minimally possible value
of the corresponding energy functional and the relativistic energy eigenvalue
equations do appear as the corresponding variational equations. The matter part
of these eigenvalue equations is a relativistic generalization of the
well-known Ritz principle in non-relativistic quantum mechanics which however
disregards the dynamical character of the particle interactions. If the latter
are included in the proposed principle of minimal energy for the bound states,
one obtains a closed dynamical system for both matter and gauge fields. The new
variational principle enables the development of variational techniques for
solving approximately the energy eigenvalue equations. As a demonstration, the
positronium groundstate is treated in great detail. Here a simple exponential
trial function is sufficient in order to reproduce the (exact) result of
conventional quantum mechanics where the relativistic and spin effects are
neglected.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:14:46 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Jul 2008 16:42:29 GMT"
}
] | 2008-07-03T00:00:00 | [
[
"Mattes",
"M.",
""
],
[
"Sorg",
"M.",
""
]
] |
0708.1490 | Juli\'an Candia | Juli\'an Candia | Nonequilibrium Opinion Spreading on 2D Small-World Networks | 14 pages, 7 figures. To appear in JSTAT | J. Stat. Mech. (2007) P09001 | 10.1088/1742-5468/2007/09/P09001 | null | physics.soc-ph cond-mat.dis-nn cond-mat.stat-mech physics.comp-ph | null | Irreversible opinion spreading phenomena are studied on small-world networks
generated from 2D regular lattices by means of the magnetic Eden model, a
nonequilibrium kinetic model for the growth of binary mixtures in contact with
a thermal bath. In this model, the opinion or decision of an individual is
affected by those of their acquaintances, but opinion changes (analogous to
spin flips in an Ising-like model) are not allowed. Particularly, we focus on
aspects inherent to the underlying 2D nature of the substrate, such as domain
growth and cluster size distributions. Larger shortcut fractions are observed
to favor long-range ordering connections between distant clusters across the
network, while the temperature is shown to drive the system across an
order-disorder transition, in agreement with previous investigations on related
equilibrium spin systems. Furthermore, the extrapolated phase diagram, as well
as the correlation length critical exponent, are determined by means of
standard finite-size scaling procedures.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:39:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Candia",
"Julián",
""
]
] |
0708.1491 | Jean-Luc Marichal | Jean-Luc Marichal | On perfect, amicable, and sociable chains | 10 pages | null | null | null | math.CO cs.DM math.NT | null | Let $x = (x_0,...,x_{n-1})$ be an n-chain, i.e., an n-tuple of non-negative
integers $< n$. Consider the operator $s: x \mapsto x' = (x'_0,...,x'_{n-1})$,
where x'_j represents the number of $j$'s appearing among the components of x.
An n-chain x is said to be perfect if $s(x) = x$. For example, (2,1,2,0,0) is a
perfect 5-chain. Analogously to the theory of perfect, amicable, and sociable
numbers, one can define from the operator s the concepts of amicable pair and
sociable group of chains. In this paper we give an exhaustive list of all the
perfect, amicable, and sociable chains.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:45:38 GMT"
}
] | 2010-11-19T00:00:00 | [
[
"Marichal",
"Jean-Luc",
""
]
] |
0708.1492 | Rosemary Wyse | Rosemary F.G. Wyse and Gerard Gilmore | Observed Properties of Dark Matter on Small Spatial Scales | To appear in proceedings of IAU Symposium 244, `Dark Galaxies & Lost
Baryons', eds J. Davies & M. Disney. Eight pages | null | 10.1017/S1743921307013828 | null | astro-ph | null | The nature of dark matter is one of the outstanding questions of
astrophysics. The internal motions of member stars reveal that the lowest
luminosity galaxies in the Local Group are the most dark-matter dominated. New
large datasets allow one to go further, and determine systematic properties of
their dark matter haloes. We summarise recent results, emphasising the critical
role of the dwarf spheroidal galaxies in understanding both dark matter and
baryonic processes that shape galaxy evolution.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:47:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wyse",
"Rosemary F. G.",
""
],
[
"Gilmore",
"Gerard",
""
]
] |
0708.1493 | Umesh Garg | S. Mukhopadhyay, D. Almehed, U. Garg, S. Frauendorf, T. Li, P. V.
Madhusudhana Rao, X. Wang, S. S. Ghugre, M. P. Carpenter, S. Gros, A. Hecht,
R. V. F. Janssens, F. G. Kondev, T. Lauritsen, D. Seweryniak, and S. Zhu | From chiral vibration to static chirality in ^{135}Nd | Accepted for publication in the Physical Review Letters. Small
modifications to fit the length limits of the journal. 10 pages, 4 figures | Phys.Rev.Lett.99:172501,2007 | 10.1103/PhysRevLett.99.172501 | null | nucl-ex nucl-th | null | Electromagnetic transition probabilities have been measured for the intra-
and inter-band transitions in the two sequences in the nucleus ^{135}Nd that
were previously identified as a composite chiral pair of rotational bands. The
measurements are in good agreement with results of a new combination of TAC and
RPA calculations. The chiral character of the bands is affirmed and it is shown
that their behavior is associated with a transition from a vibrational into a
static chiral regime.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:58:16 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Sep 2007 20:26:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mukhopadhyay",
"S.",
""
],
[
"Almehed",
"D.",
""
],
[
"Garg",
"U.",
""
],
[
"Frauendorf",
"S.",
""
],
[
"Li",
"T.",
""
],
[
"Rao",
"P. V. Madhusudhana",
""
],
[
"Wang",
"X.",
""
],
[
"Ghugre",
"S. S.",
""
],
[
"Carpenter",
"M. P.",
""
],
[
"Gros",
"S.",
""
],
[
"Hecht",
"A.",
""
],
[
"Janssens",
"R. V. F.",
""
],
[
"Kondev",
"F. G.",
""
],
[
"Lauritsen",
"T.",
""
],
[
"Seweryniak",
"D.",
""
],
[
"Zhu",
"S.",
""
]
] |
0708.1494 | Jean Alexandre | Jean Alexandre | A new non-perturbative time-dependent string configuration | Talk given at PASCOS-07 | AIPConf.Proc.957:289-292,2007 | 10.1063/1.2823783 | null | hep-th gr-qc hep-ph | null | A time-dependent bosonic string configuration is discussed, in graviton and
dilaton backgrounds, leading to Weyl-symmetry beta-functions which are
homogeneous in X^0, to any order in alpha'. As a consequence, a string
reparametrization can always be implemented, such that beta functions can be
cancelled, to any order in alpha'. This non-perturbative conformal invariance
is valid for any target space dimension, and leads to a power law expanding
Universe, for which the power vanishes if a specific relation between the
dimension and dilaton amplitude holds. Finally, D=4 is the minimum dimension
(in the case of a spherical world sheet) for which this configuration is
consistent with a Wick rotation in a Minkowski target space.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 17:49:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Alexandre",
"Jean",
""
]
] |
0708.1495 | Jon Urheim | MINOS Collaboration | Preliminary Results from MINOS on Muon Neutrino Disappearance Based on
an Exposure of 2.5x10^20 120 GeV Protons on the NuMI Target | 13 pages, including 10 figures (20 figure files), submitted to the
XXIII International Symposium on Lepton and Photon Interactions at High
Energy, Daegu Korea, August 13-18, 2007. v2 fix typo in number of expected
events | null | null | Fermilab-pub-07-413 | hep-ex hep-ph | null | Updating our previous measurements with new data and analysis modifications,
we report preliminary results on the energy-dependent deficit of muon neutrinos
from the Fermilab NuMI beam as observed with the MINOS Far Detector located 735
km away in the Soudan Underground Laboratory. From an exposure of 2.50x10^20
protons on target, we observe 563 charged-current nu_mu interaction candidates
in the Far Detector, where 738+/-30 events are expected in the absence of
neutrino oscillations. We have analyzed these data assuming two-flavor nu_mu to
nu_tau oscillations. From a simultaneous fit to the reconstructed nu_mu energy
spectra obtained during two running periods we obtain the neutrino squared-mass
difference Delta m_{32}^2 = (2.38 +0.20/-0.16) x 10^-3 eV^2/c^4 with errors at
68% confidence level (CL), and mixing angle sin^2(2 theta_23) > 0.84 at 90% CL.
The uncertainties and confidence intervals include both statistical and
systematic errors. All results and plots presented here are preliminary.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:12:56 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 15:44:30 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"MINOS Collaboration",
"",
""
]
] |
0708.1496 | Mihai Oltean | Mihai Oltean | A Light-Based Device for Solving the Hamiltonian Path Problem | 11 pages, Unconventional Computation conference, 2006 | LNCS 4135, Unconventional Computation conference, pp. 217-227,
2006 | 10.1007/11839132 | null | cs.AR cs.DC | null | In this paper we suggest the use of light for performing useful computations.
Namely, we propose a special device which uses light rays for solving the
Hamiltonian path problem on a directed graph. The device has a graph-like
representation and the light is traversing it following the routes given by the
connections between nodes. In each node the rays are uniquely marked so that
they can be easily identified. At the destination node we will search only for
particular rays that have passed only once through each node. We show that the
proposed device can solve small and medium instances of the problem in
reasonable time.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:12:52 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Oltean",
"Mihai",
""
]
] |
0708.1497 | Alfonso Martinez | Alfonso Martinez | Information Rate Loss due to Radiation Decoherence | 6 pages | null | null | null | quant-ph | null | The information rates achievable by using electromagnetic radiation affected
by thermal noise and signal decoherence are studied. The standard coherent
Gaussian model is compared with an alternative photon gas model which
represents lack of a shared phase reference between transmitter and receiver.
At any frequency, information rates over the photon gas model essentially
coincide with those over the Gaussian model when the signal-to-noise ratio is
below a threshold. Only above the threshold does decoherence cause a loss in
information rates; the loss can amount to half of the capacity. The threshold
exceeds 40 dB for radio frequencies and vanishes at optical frequencies.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:18:28 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Martinez",
"Alfonso",
""
]
] |
0708.1498 | Sean Huver | Zhanghan Wu, Sean D. Huver, Dmitry Uskov, Hwang Lee, and Jonathan P.
Dowling | Optimizing Optical Quantum Logic Gates using Genetic Algorithms | 4 pages, 3 figures | null | null | null | quant-ph | null | We introduce the method of using an annealing genetic algorithm to the
numerically complex problem of looking for quantum logic gates which
simultaneously have highest fidelity and highest success probability. We first
use the linear optical quantum nonlinear sign (NS) gate as an example to
illustrate the efficiency of this method. We show that by appropriately
choosing the annealing parameters, we can reach the theoretical maximum success
probability (1/4 for NS) for each attempt. We then examine the controlled-z
(CZ) gate as the first new problem to be solved. We show results that agree
with the highest known maximum success probability for a CZ gate (2/27) while
maintaining a fidelity of 0.9997. Since the purpose of our algorithm is to
optimize a unitary matrix for quantum transformations, it could easily be
applied to other areas of interest such as quantum optics and quantum sensors.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:39:16 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 22:02:51 GMT"
}
] | 2007-09-05T00:00:00 | [
[
"Wu",
"Zhanghan",
""
],
[
"Huver",
"Sean D.",
""
],
[
"Uskov",
"Dmitry",
""
],
[
"Lee",
"Hwang",
""
],
[
"Dowling",
"Jonathan P.",
""
]
] |
0708.1499 | Suzanne Talon | Suzanne Talon | Transport processes in stars: diffusion, rotation, magnetic fields and
internal waves | 50 pages, proceedings of the Aussois school "Stellar Nucleosynthesis:
50 years after B2FH" | null | 10.1051/eas:0832003 | null | astro-ph | null | In this paper, I explore various transport processes that have a large impact
of the distribution of elements inside stars and thus, on stellar evolution. A
heuristic description of the physics behind equations is provided, and key
references are given. Finally, for each process, I will briefly review (some)
important results as well as discuss directions for future work.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:32:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Talon",
"Suzanne",
""
]
] |
0708.1500 | Maria A. Avino-Diaz | Maria A. Avino-Diaz | The reverse engineering problem with probabilities and sequential
behavior: Probabilistic Sequential Networks | Key words: simulation, homomorphism, dynamical system, sequential
network, reverse engineering problem. Submitted to Elsevier | null | null | null | math.DS math.CT | null | The reverse engineering problem with probabilities and sequential behavior is
introducing here, using the expression of an algorithm. The solution is
partially founded, because we solve the problem only if we have a Probabilistic
Sequential Network. Therefore the probabilistic structure on sequential
dynamical systems is introduced here, the new model will be called
Probabilistic Sequential Network, PSN. The morphisms of Probabilistic
Sequential Networks are defined using two algebraic conditions, whose imply
that the distribution of probabilities in the systems are close. It is proved
here that two homomorphic Probabilistic Sequential Networks have the same
equilibrium or steady state probabilities. Additionally, the proof of the set
of PSN with its morphisms form the category PSN, having the category of
sequential dynamical systems SDS, as a full subcategory is given. Several
examples of morphisms, subsystems and simulations are given.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:35:38 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Avino-Diaz",
"Maria A.",
""
]
] |
0708.1501 | Daniel H. Lenz | Anne Boutet de Monvel, Daniel Lenz, Peter Stollmann | Sch'nol's Theorem For Strongly Local Forms | 18 pages | null | null | null | math.SP math.AP | null | We prove a variant of Sch'nol's theorem in a general setting: for generators
of strongly local Dirichlet forms perturbed by measures. As an application, we
discuss quantum graphs with $\delta$- or Kirchhoff boundary conditions.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:36:30 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"de Monvel",
"Anne Boutet",
""
],
[
"Lenz",
"Daniel",
""
],
[
"Stollmann",
"Peter",
""
]
] |
0708.1502 | Kasper Peeters | Kasper Peeters and Marija Zamaklar | The string/gauge theory correspondence in QCD | Lectures presented by KP at the 45th Winter School on Theoretical
Physics, February 2007, Schladming, Austria; v3: minor corrections, typos
fixed, references added | Eur.Phys.J.ST152:113-138,2007 | 10.1140/epjst/e2007-00379-0 | SPIN-07/23, ITP-UU-07/34, DCPT-07/39 | hep-ph hep-lat hep-th | null | Ideas about a duality between gauge fields and strings have been around for
many decades. During the last ten years, these ideas have taken a much more
concrete mathematical form. String descriptions of the strongly coupled
dynamics of semi-realistic gauge theories, exhibiting confinement and chiral
symmetry breaking, are now available. These provide remarkably simple ways to
compute properties of the strongly coupled quark-gluon fluid phase, and also
shed new light on various phenomenological models of hadron fragmentation. We
present a review and highlight some exciting recent developments.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 18:54:15 GMT"
},
{
"version": "v2",
"created": "Sun, 12 Aug 2007 16:57:26 GMT"
},
{
"version": "v3",
"created": "Tue, 19 Feb 2008 11:41:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Peeters",
"Kasper",
""
],
[
"Zamaklar",
"Marija",
""
]
] |
0708.1503 | Vladimir Vovk | Vladimir Vovk | Defensive forecasting for optimal prediction with expert advice | 14 pages | null | null | null | cs.LG | null | The method of defensive forecasting is applied to the problem of prediction
with expert advice for binary outcomes. It turns out that defensive forecasting
is not only competitive with the Aggregating Algorithm but also handles the
case of "second-guessing" experts, whose advice depends on the learner's
prediction; this paper assumes that the dependence on the learner's prediction
is continuous.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:19:54 GMT"
}
] | 2007-08-13T00:00:00 | [
[
"Vovk",
"Vladimir",
""
]
] |
0708.1504 | Satoshi Kokado | Satoshi Kokado, Kazumasa Ueda, Kikuo Harigaya, Akimasa Sakuma | Theoretical study of a localized quantum spin reversal by the sequential
injection of spins in a spin quantum dot | 12 pages, 12 figures, to be published in Phys. Rev. B, typos
corrected | Phys. Rev. B 76 (2007), 054451-1 - 054451-11 | 10.1103/PhysRevB.76.054451 | null | cond-mat.mes-hall cond-mat.mtrl-sci quant-ph | null | This is a theoretical study of the reversal of a localized quantum spin
induced by sequential injection of spins for a spin quantum dot that has a
quantum spin. The system consists of ``electrode/quantum
well(QW)/dot/QW/electrode" junctions, in which the left QW has an energy level
of conduction electrons with only up-spin. We consider a situation in which
up-spin electrons are sequentially injected from the left electrode into the
dot through the QW and an exchange interaction acts between the electrons and
the localized spin. To describe the sequentially injected electrons, we propose
a simple method based on approximate solutions from the time-dependent
Schr$\ddot{\rm o}$dinger equation. Using this method, it is shown that the spin
reversal occurs when the right QW has energy levels of conduction electrons
with only down-spin. In particular, the expression of the reversal time of a
localized spin is derived and the upper and lower limits of the time are
clearly expressed. This expression is expected to be useful for a rough
estimation of the minimum relaxation time of the localized spin to achieve the
reversal. We also obtain analytic expressions for the expectation value of the
localized spin and the electrical current as a function of time. In addition,
we found that a system with the non-magnetic right QW exhibits spin reversal or
non-reversal depending on the exchange interaction.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:23:31 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Aug 2007 03:51:03 GMT"
}
] | 2009-01-11T00:00:00 | [
[
"Kokado",
"Satoshi",
""
],
[
"Ueda",
"Kazumasa",
""
],
[
"Harigaya",
"Kikuo",
""
],
[
"Sakuma",
"Akimasa",
""
]
] |
0708.1505 | Dominik Janzing | Dominik Janzing and Thomas Decker | How much is a quantum controller controlled by the controlled system? | 17 pages, references added, results slightly improved | null | null | null | quant-ph | null | We consider unitary transformations on a bipartite system A x B. To what
extent entails the ability to transmit information from A to B the ability to
transfer information in the converse direction? We prove a dimension-dependent
lower bound on the classical channel capacity C(A<--B) in terms of the capacity
C(A-->B) for the case that the bipartite unitary operation consists of
controlled local unitaries on B conditioned on basis states on A. This can be
interpreted as a statement on the strength of the inevitable backaction of a
quantum system on its controller.
If the local operations are given by the regular representation of a finite
group G we have C(A-->B)=log |G| and C(A<--B)=log N where N is the sum over the
degrees of all inequivalent representations. Hence the information deficit
C(A-->B)-C(A<--B) between the forward and the backward capacity depends on the
"non-abelianness" of the control group. For regular representations, the ratio
between backward and forward capacities cannot be smaller than 1/2. The
symmetric group S_n reaches this bound asymptotically. However, for the general
case (without group structure) all bounds must depend on the dimensions since
it is known that the ratio can tend to zero.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:40:16 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 00:07:40 GMT"
}
] | 2007-08-21T00:00:00 | [
[
"Janzing",
"Dominik",
""
],
[
"Decker",
"Thomas",
""
]
] |
0708.1506 | Eugene Levin | E. Gotsman, E. Levin and U. Maor (Tel Aviv Univ.) | A Soft Interaction Model at Ultra High Energies: Amplitudes, Cross
Sections and Survival Probabilities | 22 pages, 15 figures | null | null | TAUP -2560-07 | hep-ph | null | In this paper we present a two channel model with the goal of reproducing the
soft scattering data available in the ISR-Tevatron energy range, and extend the
model results to LHC and Cosmic Rays energies. A characteristic feature of the
model is that we represent the sum of all diffractive final states at a vertex,
by a single diffractive state. Our two main results are: (i) The approach of
the elastic scattering amplitude to the black disc bound is very slow, reaching
it at energies far higher than the GZK ankle cutoff. (ii) Our predicted
survival probability for Higgs exclusive central diffractive production at the
LHC is 0.7%, which is considerably smaller than our previous estimate. The
above features are compatible with a parton-like model in which the traditional
soft Pomeron is replaced by an amplitude describing the partonic system, which
issaturated in the soft (long distance) limit.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:32:19 GMT"
},
{
"version": "v2",
"created": "Sun, 4 Nov 2007 07:20:53 GMT"
}
] | 2007-11-05T00:00:00 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv Univ."
],
[
"Levin",
"E.",
"",
"Tel Aviv Univ."
],
[
"Maor",
"U.",
"",
"Tel Aviv Univ."
]
] |
0708.1507 | Bernd Schroers | Catherine Meusburger, Bernd Schroers | Quaternionic and Poisson-Lie structures in 3d gravity: the cosmological
constant as deformation parameter | 34 pages, minor corrections, references added | J.Math.Phys.49:083510,2008 | 10.1063/1.2973040 | EMPG-07-15, pi-qg-55 | gr-qc hep-th math-ph math.MP | null | Each of the local isometry groups arising in 3d gravity can be viewed as the
group of unit (split) quaternions over a ring which depends on the cosmological
constant. In this paper we explain and prove this statement, and use it as a
unifying framework for studying Poisson structures associated with the local
isometry groups. We show that, in all cases except for Euclidean signature with
positive cosmological constant, the local isometry groups are equipped with the
Poisson-Lie structure of a classical double. We calculate the dressing action
of the factor groups on each other and find, amongst others, a simple and
unified description of the symplectic leaves of SU(2) and SL(2,R). We also
compute the Poisson structure on the dual Poisson-Lie groups of the local
isometry groups and on their Heisenberg doubles; together, they determine the
Poisson structure of the phase space of 3d gravity in the so-called
combinatorial description.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:39:19 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 09:16:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Meusburger",
"Catherine",
""
],
[
"Schroers",
"Bernd",
""
]
] |
0708.1508 | Rudolph C. Hwa | Rudolph C. Hwa | Elliptic Flow arising from Ridges due to Semi-hard Scattering | revised version with new title and expanded discussion, to be
published in Phys. Lett. B | null | 10.1016/j.physletb.2008.06.075 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Azimuthal anisotropy in heavy-ion collisions is studied by taking into
account the ridges generated by semi-hard scattering of intermediate-momentum
partons, which can be sensitive to the initial spatial configuration of the
medium in non-central collisions. In a simple treatment of the problem where
the recombination of only thermal partons is considered, analytical formulas
can be derived that yield results in accord with the data on v_2 for p_T <1-2
GeV/c. Centrality dependence is described by a geometrical factor. Ridge
phenomenology is used to determine the initial slopes of v_2 at low p_T for
both pion and proton. For higher p_T, shower partons from high-p_T jets must be
included, but they are not considered here.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:40:14 GMT"
},
{
"version": "v2",
"created": "Tue, 20 Nov 2007 23:16:53 GMT"
},
{
"version": "v3",
"created": "Wed, 2 Jul 2008 17:26:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hwa",
"Rudolph C.",
""
]
] |
0708.1509 | Alin Panaitescu | A. Panaitescu | X-ray flares, plateaus, and chromatic breaks of GRB afterglows from
up-scattered forward-shock emission | to appear in MNRAS, 12 pages, 7 figures | Mon.Not.Roy.Astron.Soc. 383 (2008) 1143-1153 | 10.1111/j.1365-2966.2007.12607.x | null | astro-ph | null | Scattering of the forward-shock synchrotron emission by a relativistic
outflow located behind the leading blast-wave may produce an X-ray emission
brighter than that coming directly from the forward-shock and may explain four
features displayed by Swift X-ray afterglows: flares, plateaus (slow decays),
chromatic light-curve breaks, and fast post-plateau decays. For a cold
scattering outflow, the reflected flux overshines the primary one if the
scattering outflow is nearly baryon-free and highly relativistic. These two
requirements can be relaxed if the scattering outflow is energized by weak
internal shocks, so that the incident forward-shock photons are also
inverse-Compton scattered, in addition to bulk-scattering. Sweeping-up of the
photons left behind by the forward shock naturally yields short X-ray flares.
Owing to the boost in photon energy produced by bulk-scattering scattering, the
reflected emission is more likely to overshine that coming directly from the
forward shock at higher photon energies, yielding light-curve plateaus and
breaks that appear only in the X-ray. The brightness, shape, and decay of the
X-ray light-curve plateau depend on the radial distribution of the scatterer's
Lorentz factor and mass-flux. Chromatic X-ray light-curve breaks and sharp
post-plateau decays cannot be accommodated by the direct forward-shock emission
and argue in favour of the scattering-outflow model proposed here. On the other
hand, the X-ray afterglows without plateaus, those with achromatic breaks, and
those with very long-lived power-law decays are more naturally accommodated by
the standard forward-shock model. Thus the diversity of X-ray light-curves
arises from the interplay of the scattered and direct forward-shock emissions.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 19:51:59 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Oct 2007 19:21:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Panaitescu",
"A.",
""
]
] |
0708.1510 | Bethany Cobb | Bethany E. Cobb and Charles D. Bailyn | Connecting GRBs and galaxies: the probability of chance coincidence | edited, accepted by ApJ | Astrophys.J.677:1157-1167,2008 | 10.1086/533427 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studies of GRB host galaxies are crucial to understanding GRBs. However,
since they are identified by the superposition in the plane of the sky of a GRB
afterglow and a galaxy there is always a possibility that an association
represents a chance alignment, rather than a physical connection. We examine a
uniform sample of 72 GRB fields to explore the probability of chance
superpositions. There is typically a ~1% chance that an optical afterglow will
coincide with a galaxy by chance. While spurious host galaxy detections will,
therefore, be rare, the possibility must be considered when examining
individual GRB/host galaxy examples. It is also tempting to use the large and
uniform collection of X-ray afterglow positions to search for GRB-associated
galaxies. However, we find that approximately half of the 14 superpositions in
our sample are likely to occur by chance, so in the case of GRBs localized only
by an X-ray afterglow, even statistical studies are suspect.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 20:09:00 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Oct 2010 22:35:35 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Cobb",
"Bethany E.",
""
],
[
"Bailyn",
"Charles D.",
""
]
] |
0708.1511 | Edo Berger | E. Berger, J.E. Gizis, M.S. Giampapa, R.E. Rutledge, J. Liebert, E.
Martin, G. Basri, T.A. Fleming, C.M. Johns-Krull, N. Phan-Bao, W.H. Sherry | Simultaneous Multi-Wavelength Observations of Magnetic Activity in
Ultracool Dwarfs. I. The Complex Behavior of the M8.5 Dwarf TVLM513-46546 | 13 pages, 4 figures | null | 10.1086/524769 | null | astro-ph | null | [Abridged] We present the first simultaneous radio, X-ray, ultraviolet, and
optical spectroscopic observations of the M8.5 dwarf TVLM513-46546, with a
duration of 9 hours. These observations are part of a program to study the
origin of magnetic activity in ultracool dwarfs, and its impact on
chromospheric and coronal emission. Here we detect steady quiescent radio
emission superposed with multiple short-duration, highly polarized flares;
there is no evidence for periodic bursts previously reported for this object,
indicating their transient nature. We also detect soft X-ray emission, with
L_X/L_bol~10^-4.9, the faintest to date for any object later than M5, and a
possible weak X-ray flare. TVLM513-46546 continues the trend of severe
violation of the radio/X-ray correlation in ultracool dwarfs, by nearly 4
orders of magnitude. From the optical spectroscopy we find that the Balmer line
luminosity exceeds the X-ray luminosity by a factor of a few, suggesting that,
unlike in early M dwarfs, chromospheric heating may not be due to coronal X-ray
emission. More importantly, we detect a sinusoidal H-alpha light curve with a
period of 2 hr, matching the rotation period of TVLM513-46546. This is the
first known example of such Balmer line behavior, which points to a co-rotating
chromospheric hot spot or an extended magnetic structure, with a covering
fraction of about 50%. This feature may be transitory based on the apparent
decline in light curve peak during the four observed maxima. From the radio
data we infer a large scale steady magnetic field of ~100 G, in good agreement
with the value required for confinement of the X-ray emitting plasma. The radio
flares, on the other hand, are produced in a component of the field with a
strength of ~3 kG and a likely multi-polar configuration.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 20:00:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Berger",
"E.",
""
],
[
"Gizis",
"J. E.",
""
],
[
"Giampapa",
"M. S.",
""
],
[
"Rutledge",
"R. E.",
""
],
[
"Liebert",
"J.",
""
],
[
"Martin",
"E.",
""
],
[
"Basri",
"G.",
""
],
[
"Fleming",
"T. A.",
""
],
[
"Johns-Krull",
"C. M.",
""
],
[
"Phan-Bao",
"N.",
""
],
[
"Sherry",
"W. H.",
""
]
] |
0708.1512 | Mihai Oltean | Mihai Oltean | Solving the Hamiltonian path problem with a light-based computer | 17 pages, Natural Computing journal | Natural Computing, Springer, Vol 6, 2007 | 10.1007/s11047-007-9042-z | null | cs.AR cs.DC | null | In this paper we propose a special computational device which uses light rays
for solving the Hamiltonian path problem on a directed graph. The device has a
graph-like representation and the light is traversing it by following the
routes given by the connections between nodes. In each node the rays are
uniquely marked so that they can be easily identified. At the destination node
we will search only for particular rays that have passed only once through each
node. We show that the proposed device can solve small and medium instances of
the problem in reasonable time.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 20:01:24 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Oltean",
"Mihai",
""
]
] |
0708.1513 | Roberto Assef | R.J. Assef, C.S. Kochanek, M. Brodwin, M.J.I. Brown, N. Caldwell, R.J.
Cool, P. Eisenhardt, D. Eisenstein, A.H. Gonzalez, B.T. Jannuzi, C. Jones, E.
McKenzie, S.S. Murray, D. Stern | Low Resolution Spectral Templates For Galaxies From 0.2 -- 10 microns | Accepted for publication in The Astrophysical Journal. 22 text pages
+ 6 tables + 15 figures. Minor modifications from the original version.
Fortran codes, templates and electronic tables available at
http://www.astronomy.ohio-state.edu/~rjassef/lrt/ | Astrophys.J. 676 (2008) 286 | 10.1086/527533 | null | astro-ph | null | We built an optimal basis of low resolution templates for galaxies over the
wavelength range from 0.2 to 10 $\mu$m using a variant of the algorithm
presented by Budavari et al. (2000). We derived them using eleven bands of
photometry from the NDWFS, FLAMEX, zBo\"otes and IRAC Shallow surveys for 16033
galaxies in the NDWFS Bo\"otes field with spectroscopic redshifts measured by
the AGN and Galaxy Evolution Survey. We also developed algorithms to accurately
determine photometric redshifts, K corrections and bolometric luminosities
using these templates. Our photometric redshifts have an accuracy of
$\sigma_z/(1+z) = 0.04$ when clipped to the best 95%. We used these templates
to study the spectral type distribution in the field and to estimate luminosity
functions of galaxies as a function of redshift and spectral type. In
particular, we note that the 5-8$\mu$m color distribution of galaxies is
bimodal, much like the optical g--r colors.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 20:02:07 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jan 2008 01:09:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Assef",
"R. J.",
""
],
[
"Kochanek",
"C. S.",
""
],
[
"Brodwin",
"M.",
""
],
[
"Brown",
"M. J. I.",
""
],
[
"Caldwell",
"N.",
""
],
[
"Cool",
"R. J.",
""
],
[
"Eisenhardt",
"P.",
""
],
[
"Eisenstein",
"D.",
""
],
[
"Gonzalez",
"A. H.",
""
],
[
"Jannuzi",
"B. T.",
""
],
[
"Jones",
"C.",
""
],
[
"McKenzie",
"E.",
""
],
[
"Murray",
"S. S.",
""
],
[
"Stern",
"D.",
""
]
] |
0708.1514 | Elizabeth Wehner | Elizabeth Wehner and William Harris | UCD Candidates in the Hydra Cluster | 5 pages, 3 figures. Accepted for publication in ApJ Letters | null | 10.1086/522305 | null | astro-ph | null | NGC 3311, the giant cD galaxy in the Hydra cluster (A1060), has one of the
largest globular cluster systems known. We describe new Gemini GMOS (g',i')
photometry of the NGC 3311 field which reveals that the red, metal-rich side of
its globular cluster population extends smoothly upward into the mass range
associated with the new class of Ultra-Compact Dwarfs (UCDs). We identify 29
UCD candidates with estimated masses > 6x10^6 solar masses and discuss their
characteristics. This UCD-like sequence is the most well defined one yet seen,
and reinforces current ideas that the high-mass end of the globular cluster
sequence merges continuously into the UCD sequence, which connects in turn to
the E galaxy structural sequence.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 20:06:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wehner",
"Elizabeth",
""
],
[
"Harris",
"William",
""
]
] |
0708.1515 | Jana Bilikova | J. Bilikova, R. N. M. Williams, Y.-H. Chu, R. A. Gruendl and B. F.
Lundgren | Supernova Remnants in the Large Magellanic Clouds IX: Multiwavelength
Analysis of the Physical Structure of N49 | 25 pages, 9 figures, accepted by the Astronomical Journal, November
2007 Issue | Astron.J.134:2308-2317,2007 | 10.1086/522302 | null | astro-ph | null | We present a multiwavelength analysis of the supernova remnant N49 in the
Large Magellanic Cloud. Using high-resolution Hubble Space Telescope WFPC2
images of H-alpha, [S II] and [O III] emission, we study the morphology of the
remnant and calculate the rms electron densities in different regions. We
detect an offset of [O III] and H-alpha emission of about 0.5 arcsec, and
discuss possible scenarios that could give rise to such high values. The
kinematics of the remnant is analyzed by matching individual filaments to the
echelle spectra obtained at CTIO. We detect narrow H-alpha emission component
which we identify as the diffuse post-shock recombination radiation, and
discrete broad emission features that correspond to the shocked gas in
filaments. The overall expansion of the remnant is about 250 km/s. The dense
clouds are shocked up to line-of-sight velocities of 250 km/s and the less
dense gas up to 300 km/s. A few cloudlets have even higher radial velocities,
reaching up to 350 km/s. We confirm the presence of the cavity in the remnant,
and identify the center of explosion. Using archival Chandra and XMM-Newton
data, we observe the same trends in surface brightness distribution for the
optical and X-ray images. We carry out the spectral analysis of three regions
that represent the most significant optical features.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 20:16:43 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bilikova",
"J.",
""
],
[
"Williams",
"R. N. M.",
""
],
[
"Chu",
"Y. -H.",
""
],
[
"Gruendl",
"R. A.",
""
],
[
"Lundgren",
"B. F.",
""
]
] |
0708.1516 | Dieter Horns | K. Manolakou (1), D. Horns (1), J.G. Kirk (2) ((1) Institute for
Astronomy and Astrophysics Tuebingen, Germany, (2) Max-Planck-Institute fuer
Kernphysik, Heidelberg, Germany) | Spectral evolution of non-thermal electron distributions in intense
radiation fields | 14 pages, 8 figures, acccepted for publication in A&A | null | 10.1051/0004-6361:20078298 | null | astro-ph | null | (abridged) Models of many astrophysical gamma-ray sources assume they contain
a homogeneous distribution of electrons that are injected as a power-law in
energy and evolve by interacting with radiation fields, magnetic fields and
particles in the source and by escaping. This problem is particularly
complicated if the radiation fields have higher energy density than the
magnetic field and are sufficiently energetic that inverse Compton scattering
is not limited to the Thomson regime. We present a simple, time-dependent,
semi-analytical solution of the electron kinetic equation that treats both
continuous and impulsive injection, cooling via synchrotron and inverse Compton
radiation, (taking into account Klein-Nishina effects) and energy dependent
particle escape. The kinetic equation for an arbitrary, time-dependent source
function is solved by the method of Laplace transformations. Using an
approximate expression for the energy loss rate that takes into account
synchrotron and inverse Compton losses including Klein-Nishina effects for
scattering off an isotropic photon field with either a power-law or black-body
distribution, we find explicit expressions for the cooling time and escape
probability of individual electrons. This enables the full, time-dependent
solution to be reduced to a single quadrature. From the electron distribution,
we then construct the time-dependent, multi-wavelength emission spectrum. We
compare our solutions with several limiting cases and discuss the general
appearance and temporal behaviour of spectral features (i.e., cooling breaks,
bumps etc.). As a specific example, we model the broad-band energy spectrum of
the open stellar association Westerlund-2 at different times of its evolution,
and compare it with observations.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 18:11:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Manolakou",
"K.",
""
],
[
"Horns",
"D.",
""
],
[
"Kirk",
"J. G.",
""
]
] |
0708.1517 | Ariel G. Sanchez | Ariel G. Sanchez (1), Shaun Cole (2) ((1) Instituto de Astronomia
Teorica y Experimental (IATE), Cordoba, Argentina, (2) Institute for
Computational Cosmology, Durham, UK) | The galaxy power spectrum: precision cosmology from large scale
structure? | 13 pages, 10 figures; minor changes to match version accepted for
publication in MNRAS | Mon.Not.Roy.Astron.Soc.385:830-840,2008 | 10.1111/j.1365-2966.2007.12787.x | null | astro-ph | null | Published galaxy power spectra from the 2dFGRS and SDSS are not in good
agreement. We revisit this issue by analyzing both the 2dFGRS and SDSS DR5
catalogues using essentially identical techniques. We confirm that the 2dFGRS
exhibits relatively more large scale power than the SDSS, or, equivalently,
SDSS has more small scale power. We demonstrate that this difference is due to
the r-band selected SDSS catalogue being dominated by more strongly clustered
red galaxies, which have a stronger scale dependent bias. The power spectra of
galaxies of the same rest frame colours from the two surveys match well. If not
accounted for, the difference between the SDSS and 2dFGRS power spectra causes
a bias in the obtained constraints on cosmological parameters which is larger
than the uncertainty with which they are determined. We also found that the
correction developed by Cole et al.(2005) to model the distortion in the shape
of the power spectrum due to non-linear evolution and scale dependent bias is
not able to reconcile the constraints obtained from the 2dFGRS and SDSS power
spectra. Intriguingly, the model is able to describe the differences between
the 2dFGRS and the much more strongly clustered LRG sample, which exhibits
greater nonlinearities. This shows that more work is needed to understand the
relation between the galaxy power spectrum and the linear perturbation theory
prediction for the power spectrum of matter fluctuations. It is therefore
important to accurately model these effects to get precise estimates of
cosmological parameters from these power spectra and from future galaxy surveys
like Pan-STARRS, or the Dark Energy Survey, which will use selection criteria
similar to the one of SDSS.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 14:28:07 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Dec 2007 14:59:47 GMT"
}
] | 2009-07-28T00:00:00 | [
[
"Sanchez",
"Ariel G.",
""
],
[
"Cole",
"Shaun",
""
]
] |
0708.1518 | Tesla E. Jeltema | Tesla E. Jeltema, Eric J. Hallman, Jack O. Burns, and Patrick M. Motl | Cluster Structure in Cosmological Simulations I: Correlation to
Observables, Mass Estimates, and Evolution | 57 pages, 18 figures, accepted to ApJ, updated definition of T_X and
M_gas but results unchanged, for version with full resolution figures, see
http://www.ociw.edu/~tesla/sims.ps.gz | Astrophys.J.681:167-186,2008 | 10.1086/587502 | null | astro-ph | null | We use Enzo, a hybrid Eulerian AMR/N-body code including non-gravitational
heating and cooling, to explore the morphology of the X-ray gas in clusters of
galaxies and its evolution in current generation cosmological simulations. We
employ and compare two observationally motivated structure measures: power
ratios and centroid shift. Overall, the structure of our simulated clusters
compares remarkably well to low-redshift observations, although some
differences remain that may point to incomplete gas physics. We find no
dependence on cluster structure in the mass-observable scaling relations, T_X-M
and Y_X-M, when using the true cluster masses. However, estimates of the total
mass based on the assumption of hydrostatic equilibrium, as assumed in
observational studies, are systematically low. We show that the hydrostatic
mass bias strongly correlates with cluster structure and, more weakly, with
cluster mass. When the hydrostatic masses are used, the mass-observable scaling
relations and gas mass fractions depend significantly on cluster morphology,
and the true relations are not recovered even if the most relaxed clusters are
used. We show that cluster structure, via the power ratios, can be used to
effectively correct the hydrostatic mass estimates and mass-scaling relations,
suggesting that we can calibrate for this systematic effect in cosmological
studies. Similar to observational studies, we find that cluster structure,
particularly centroid shift, evolves with redshift. This evolution is mild but
will lead to additional errors at high redshift. Projection along the line of
sight leads to significant uncertainty in the structure of individual clusters:
less than 50% of clusters which appear relaxed in projection based on our
structure measures are truly relaxed.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 23:43:42 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 02:32:24 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Jeltema",
"Tesla E.",
""
],
[
"Hallman",
"Eric J.",
""
],
[
"Burns",
"Jack O.",
""
],
[
"Motl",
"Patrick M.",
""
]
] |
0708.1519 | Vadim Markel | George Y. Panasyuk, John C. Schotland and Vadim A. Markel | Classical Theory of Optical Nonlinearity in Conducting Nanoparticles | Page margins have been adjusted; otherwise, identical to the previous
version | Phys. Rev. Lett. 100, 047402 (2008) | 10.1103/PhysRevLett.100.047402 | null | physics.optics physics.class-ph | null | We develop a classical theory of electron confinement in conducting
nanoparticles. The theory is used to compute the nonlinear optical response of
the nanoparticle to a harmonic external field.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 20:34:04 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Aug 2007 16:09:25 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Panasyuk",
"George Y.",
""
],
[
"Schotland",
"John C.",
""
],
[
"Markel",
"Vadim A.",
""
]
] |
0708.1520 | Luyan Sun | L. Sun, K. R. Brown, and B. E. Kane | Coulomb blockade in a Si channel gated by an Al single-electron
transistor | 3 pages, 4 figures, 1 table; typos corrected, minor clarifications
added; published in APL | Appl. Phys. Lett. 91, 142117 (2007) | 10.1063/1.2793712 | null | cond-mat.mes-hall | null | We incorporate an Al-AlO_x-Al single-electron transistor as the gate of a
narrow (~100 nm) metal-oxide-semiconductor field-effect transistor (MOSFET).
Near the MOSFET channel conductance threshold, we observe oscillations in the
conductance associated with Coulomb blockade in the channel, revealing the
formation of a Si single-electron transistor. Abrupt steps present in sweeps of
the Al transistor conductance versus gate voltage are correlated with
single-electron charging events in the Si transistor, and vice versa. Analysis
of these correlations using a simple electrostatic model demonstrates that the
two single-electron transistor islands are closely aligned, with an
inter-island capacitance approximately equal to 1/3 of the total capacitance of
the Si transistor island, indicating that the Si transistor is strongly coupled
to the Al transistor.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 19:25:09 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Oct 2007 19:43:18 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Sun",
"L.",
""
],
[
"Brown",
"K. R.",
""
],
[
"Kane",
"B. E.",
""
]
] |
0708.1521 | Christian Moni Bidin | C. Moni Bidin, S. Moehler, G. Piotto, Y. Momany, A. Recio-Blanco | Spectroscopy of horizontal branch stars in NGC6752 - Anomalous results
on atmospheric parameters and masses | 12 pages, 10 figures, accepted for pubblication in A&A. Replaced for
typos and better LaTeX output | null | 10.1051/0004-6361:20078184 | null | astro-ph | null | We used the ESO VLT-FORS2 facility to collect low-resolution spectra of 51
targets distributed along the Horizontal Branch. We determined atmospheric
parameters by comparison with theoretical models through standard fitting
routines, and masses by basic equations. Results are in general in good
agreement with previous works, although not always with theoretical
expectations for cooler stars (Teff<15000 K). The calculated color excess is
systematically lower than literature values, pointing towards a possible
underestimation of effective temperatures. Moreover, we find two groups of
stars at Teff=14000 K and at Teff=27000$ K that present anomalies with respect
to the general trend and expectations. We suppose that the three peculiar
bright stars at Teff=14000 K are probably affected by an enhanced stellar wind.
For the eight Extreme Horizontal Branch stars at Teff=27000 K which show
unusually high masses we find no plausible explanation. While most of our
results agree well with the predictions of standard horizontal branch
evolution, we still have problems with the low masses we derive in certain
temperature ranges. We believe that Kurucz ATLAS9 LTE model atmospheres with
solar-scaled abundances are probably inadequate for these temperature ranges.
Concerning the group of anomalous stars at Teff=27000 K, a Kolmogorov-Smirnov
test indicates that there is only an 8.4% probability that these stars are
randomly drawn from the general distribution in the color-magnitude diagram.
This is not conclusive but points out that these stars could be both (and
independently) spectroscopically and photometrically peculiar with respect to
the general Extreme Horizontal Branch population.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 21:05:25 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 21:07:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bidin",
"C. Moni",
""
],
[
"Moehler",
"S.",
""
],
[
"Piotto",
"G.",
""
],
[
"Momany",
"Y.",
""
],
[
"Recio-Blanco",
"A.",
""
]
] |
0708.1522 | Todd Brintlinger | Todd Brintlinger, Yi Qi, Kamal H. Baloch, David Goldhaber-Gordon and
John Cumings | Electron Thermal Microscopy | 1 PDF file, incl. 17 pages manuscript plus 6 pages Supplementary
Discussion v2: Add corresponding author asterisk and acknowledgement | null | 10.1021/nl0729375 | null | cond-mat.mtrl-sci | null | The progress of semiconductor electronics toward ever-smaller length scales
and associated higher power densities brings a need for new high-resolution
thermal microscopy techniques. Traditional thermal microscopy is performed by
detecting infrared radiation with far-field optics, where the resolution is
limited by the wavelength of the light. By adopting a serial, local-probe
approach, near-field and scanned-probe microscopies can surpass this limit but
sacrifice imaging speed. In the same way that electron microscopy was invented
to overcome the resolution limits of light microscopy, we here demonstrate a
thermal imaging technique that uses an electron microscope to overcome the
limits of infrared thermal microscopy, without compromising imaging speed. With
this new technique, which we call electron thermal microscopy, temperature is
resolved by detecting the liquid-solid transition of arrays of nanoscale
islands, producing thermal maps in real-time (30 thermal images per second over
a 16um^2 field-of-view). The experimental demonstration is supported by
combined electrical and thermal modeling.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 21:06:45 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 17:52:17 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Brintlinger",
"Todd",
""
],
[
"Qi",
"Yi",
""
],
[
"Baloch",
"Kamal H.",
""
],
[
"Goldhaber-Gordon",
"David",
""
],
[
"Cumings",
"John",
""
]
] |
0708.1523 | Jean Turner | Jean L. Turner (UCLA), David S. Meier (NRAO) | Chemical Complexity in Galaxies | to appear in Astrophysics and Space Science, proceedings of the
international conference Science with ALMA: a new era for Astrophysics 2006 | Astrophys.Space Sci.313:267-272,2008 | 10.1007/s10509-007-9633-2 | null | astro-ph | null | ALMA will be able to detect a broad spectrum of molecular lines in galaxies.
Current aperture synthesis observations indicate that the molecular line
emission from galaxies is remarkably variable, even on kpc scales. Imaging
spectroscopy at resolutions of an arcsecond or better will reduce the chemical
complexity by allowing regions of physical conditions to be defined and
classified.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 21:33:50 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Turner",
"Jean L.",
"",
"UCLA"
],
[
"Meier",
"David S.",
"",
"NRAO"
]
] |
0708.1524 | Leonardo Ubeda | Leonardo Ubeda and Anne Pellerin | Discovery of Two Dust Pillars near the Galactic Plane | 5 pages, 2 figures, 1 table | null | null | null | astro-ph | null | We report the discovery of two dust pillars using GLIMPSE archival images
obtained with the Infrared Array Camera on board the Spitzer Space Telescope.
They are located close to the Galactic molecular cloud GRSMC45.453+0.060 and
they appear to be aligned with the ionizing region associated with
GRSMC45.478+0.131. Our three colour mosaics show that these stellar incubators
present different morphologies as seen from planet Earth. One of them shows the
unquestionable existence of young stellar objects in its head, whose influence
on the original cocoon is evident, while the other presents a well defined
bright-rimmed ionizing front. We argue that second-generation star formation
has been triggered in these protuberances by the action of massive stars
present in the nearby H II regions.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 22:04:21 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Ubeda",
"Leonardo",
""
],
[
"Pellerin",
"Anne",
""
]
] |
0708.1525 | Anabella Araudo | G. E. Romero, S. P. Owocki, A.T. Araudo, R. Townsend, P. Benaglia | Using gamma-rays to probe the clumped structure of stellar winds | 3 pages, 2 figures, to appear in the workshop proceedings "Clumping
in Hot Star Winds" | null | null | null | astro-ph | null | Gamma-rays can be produced by the interaction of a relativistic jet and the
matter of the stellar wind in the subclass of massive X-ray binaries known as
"microquasars". The relativistic jet is ejected from the surroundings of the
compact object and interacts with cold protons from the stellar wind, producing
pions that then quickly decay into gamma-rays. Since the resulting gamma-ray
emissivity depends on the target density, the detection of rapid variability in
microquasars with GLAST and the new generation of Cherenkov imaging arrays
could be used to probe the clumped structure of the stellar wind. In
particular, we show here that the relative fluctuation in gamma rays may scale
with the square root of the ratio of porosity length to binary separation,
\sqrt{h/a}, implying for example a ca. 10 % variation in gamma ray emission for
a quite moderate porosity, h/a ~ 0.01.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 22:17:38 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Romero",
"G. E.",
""
],
[
"Owocki",
"S. P.",
""
],
[
"Araudo",
"A. T.",
""
],
[
"Townsend",
"R.",
""
],
[
"Benaglia",
"P.",
""
]
] |
0708.1526 | Frank Bridges | F. Bridges, C. Downs, T. O'Brien, Il-K Jeong, T. Kimura | Limitations on the extent of off-center displacements in TbMnO3 from
EXAFS measurements | submitted to PRB; 11 pages (preprint form) 7 figures | Phys. Rev. B 76, 092109/1-4 2007 | 10.1103/PhysRevB.76.092109 | null | cond-mat.str-el cond-mat.mtrl-sci | null | We present EXAFS data at the Mn K and Tb L3 edges that provide upper limits
on the possible displacements of any atoms in TbMnO3. The displacements must be
less than 0.005-0.01A for all atoms which eliminates the possibility of
moderate distortions (0.02A) with a small c-axis component, but for which the
displacements in the ab plane average to zero. Assuming the polarization arises
from a displacement of the O2 atoms along the c-axis, the measured polarization
then leads to an O2 displacement that is at least 6X10^{-4}A, well below our
experimental limit. Thus a combination of the EXAFS and the measured electrical
polarization indicate that the atomic displacements likely lie in the range
6X10^{-4} - 5X10^{-3}A.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 22:33:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bridges",
"F.",
""
],
[
"Downs",
"C.",
""
],
[
"O'Brien",
"T.",
""
],
[
"Jeong",
"Il-K",
""
],
[
"Kimura",
"T.",
""
]
] |
0708.1527 | Stasinos Konstantopoulos | Stasinos Konstantopoulos | A Data-Parallel Version of Aleph | Proceedings of Parallel and Distributed Computing for Machine
Learning workshop, held in conjunction with the 14th European Conference on
Machine Learning. Cavtat, Croatia, 2003 | null | null | null | cs.AI cs.DC | null | This is to present work on modifying the Aleph ILP system so that it
evaluates the hypothesised clauses in parallel by distributing the data-set
among the nodes of a parallel or distributed machine. The paper briefly
discusses MPI, the interface used to access message- passing libraries for
parallel computers and clusters. It then proceeds to describe an extension of
YAP Prolog with an MPI interface and an implementation of data-parallel clause
evaluation for Aleph through this interface. The paper concludes by testing the
data-parallel Aleph on artificially constructed data-sets.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 23:32:16 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Konstantopoulos",
"Stasinos",
""
]
] |
0708.1528 | Yi-Jun Yao | Yi-Jun Yao | Rankin-Cohen Deformations and Representation Theory | null | null | null | null | math.QA math.CO | null | In this paper, we use the unitary representation theory of $SL_2(\mathbb R)$
to understand the Rankin-Cohen brackets for modular forms. Then we use this
interpretation to study the corresponding deformation problems that Paula
Cohen, Yuri Manin and Don Zagier initiated. Two uniqueness results are
established.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 23:19:40 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Yao",
"Yi-Jun",
""
]
] |
0708.1529 | Iddo Tzameret | Ran Raz, Iddo Tzameret | Resolution over Linear Equations and Multilinear Proofs | 44 pages | Annals of Pure and Applied Logic , 155(3):194-224, 2008; | 10.1016/j.apal.2008.04.001 | null | cs.CC cs.LO | null | We develop and study the complexity of propositional proof systems of varying
strength extending resolution by allowing it to operate with disjunctions of
linear equations instead of clauses. We demonstrate polynomial-size refutations
for hard tautologies like the pigeonhole principle, Tseitin graph tautologies
and the clique-coloring tautologies in these proof systems. Using the
(monotone) interpolation by a communication game technique we establish an
exponential-size lower bound on refutations in a certain, considerably strong,
fragment of resolution over linear equations, as well as a general polynomial
upper bound on (non-monotone) interpolants in this fragment.
We then apply these results to extend and improve previous results on
multilinear proofs (over fields of characteristic 0), as studied in
[RazTzameret06]. Specifically, we show the following:
1. Proofs operating with depth-3 multilinear formulas polynomially simulate a
certain, considerably strong, fragment of resolution over linear equations.
2. Proofs operating with depth-3 multilinear formulas admit polynomial-size
refutations of the pigeonhole principle and Tseitin graph tautologies. The
former improve over a previous result that established small multilinear proofs
only for the \emph{functional} pigeonhole principle. The latter are different
than previous proofs, and apply to multilinear proofs of Tseitin mod p graph
tautologies over any field of characteristic 0.
We conclude by connecting resolution over linear equations with extensions of
the cutting planes proof system.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 23:23:10 GMT"
}
] | 2010-04-19T00:00:00 | [
[
"Raz",
"Ran",
""
],
[
"Tzameret",
"Iddo",
""
]
] |
0708.1530 | Isao Maruyama | Isao Maruyama and Yasuhiro Hatsugai | Nontrivial quantized Berry phases for itinerant spin liquids | 8 pages, 4 figures | null | 10.1143/JPSJ.76.113601 | null | cond-mat.str-el | null | Quantized Berry phases as local order parameters in t-J models are studied. A
texture pattern of the local order parameters is topologically stable due to
the quantization of non-Abelian Berry phases defined by low-energy states below
a spin gap, which exists in the large J/t case with a few electrons. We have
confirmed that itinerant singlets in the wide class of t-J models carry the
nontrivial Berry phase pi. In the large J/t case for the one-dimensional t-J
model, Berry phases are uniformly pi when the number of electrons is N =4n +2,
($n=0,1,2,...$).
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 23:34:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maruyama",
"Isao",
""
],
[
"Hatsugai",
"Yasuhiro",
""
]
] |
0708.1531 | Ernst Helmut Brandt | E. H. Brandt and G. P. Mikitik | "Unusual" critical states in type-II superconductors | 15 pages including 11 figures | null | 10.1103/PhysRevB.76.064526 | null | cond-mat.supr-con | null | We give a theoretical description of the general critical states in which the
critical currents in type-II superconductors are not perpendicular to the local
magnetic induction. Such states frequently occur in real situations, e.g., when
the sample shape is not sufficiently symmetric or the direction of the external
magnetic field changes in some complex way. Our study is restricted to the
states in which flux-line cutting does not occur. The properties of such
general critical states can essentially differ from the well-known properties
of the usual Bean critical states. To illustrate our approach, we analyze
several examples. In particular, we consider the critical states in a slab
placed in a uniform perpendicular magnetic field and to which two components of
the in-plane magnetic field are then applied successively. We also analyze the
critical states in a long thin strip placed in a perpendicular magnetic field
which then is tilted towards the axis of the strip.
| [
{
"version": "v1",
"created": "Fri, 10 Aug 2007 23:57:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brandt",
"E. H.",
""
],
[
"Mikitik",
"G. P.",
""
]
] |
0708.1532 | Xianggang Qiu | Xu Fang, Zhiyuan Li, Yongbing Long, Hongxiang Wei, Rongjuan Liu, Jiyun
Ma, M. Kamran, Huaying Zhao, Xiufeng Han, Bairu Zhao, and Xianggang Qiu | Surface plasmon polaritons assisted diffraction in periodic
subwavelength holes of metal films with reduced interplane coupling | 4 pages, 5 figures, 26 references | Phys. Rev. Lett. 99, 066805(2007) | 10.1103/PhysRevLett.99.066805 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Metal films grown on Si wafer perforated with a periodic array of
subwavelength holes have been fabricated and anomalous enhanced transmission in
the mid-infrared regime has been observed. High order transmission peaks up to
Si(2,2) are clearly revealed due to the large dielectric constant contrast of
the dielectrics at the opposite interfaces. Si(1,1) peak splits at oblique
incidence both in TE and TM polarization, which confirms that anomalous
enhanced transmission is a surface plasmon polaritons (SPPs) assisted
diffraction phenomenon. Theoretical transmission spectra agree excellently with
the experimental results and confirm the role of SPPs diffraction by the
lattice.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 00:13:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fang",
"Xu",
""
],
[
"Li",
"Zhiyuan",
""
],
[
"Long",
"Yongbing",
""
],
[
"Wei",
"Hongxiang",
""
],
[
"Liu",
"Rongjuan",
""
],
[
"Ma",
"Jiyun",
""
],
[
"Kamran",
"M.",
""
],
[
"Zhao",
"Huaying",
""
],
[
"Han",
"Xiufeng",
""
],
[
"Zhao",
"Bairu",
""
],
[
"Qiu",
"Xianggang",
""
]
] |
0708.1533 | Krzysztof T. Chyzy | K.T. Chyzy, M. Ehle, R. Beck | Magnetic fields and gas in the cluster influenced spiral galaxy NGC4254
- I. Radio and X-rays observations | 17 pages, 15 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20077497 | null | astro-ph | null | Radio observations can show how cluster galaxies are affected by various
environmental factors. We made three frequency radio-polarimetric VLA
observations and performed sensitive XMM-Newton observations in X-rays and UV
light of NGC4254. The distribution of total radio intensity at 8.46 4.86 GHz
reveals a global asymmetry with a more diffuse and almost two times larger
extension to the north than to the south. The radio polarized intensity is even
more asymmetric, showing a strange bright ridge in the southern disk edge,
displaced to the downstream side of the local density wave. Magnetic arms can
be also seen in other disk portions, mostly avoiding nearby optical spiral
arms. Spatially resolved emission of hot X-ray gas from the whole galactic
disk, with its soft component closely tracing star-forming regions, is
detected. The slope of the local radio nonthermal-infrared relation is <1, thus
smaller than for the radio thermal-infrared one (>1). Using the radio thermal
emission-based star formation rate (SFR) we find higher extinction in more
Halpha luminous star-forming regions with a power-law slope of 0.83. The
galaxy's estimated mean SFR of 0.026 M_sun/yr/kpc^2 is three times larger than
in other spirals of similar Hubble type. NGC4254 seems to belong to the class
of `young' Virgo cluster members, which recently experienced a gravitational
encounter at the cluster's periphery, which perturbed its spiral arms by tidal
forces and triggered a burst of star-formation which still maintains strong
radio and infrared emissions. Tidal forces could also sheared the magnetic
field in the southern disk portion and led to the observed polarized ridge,
though, magnetic field compression by weak ram pressure forces of the cluster
gas cannot be excluded.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 00:58:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chyzy",
"K. T.",
""
],
[
"Ehle",
"M.",
""
],
[
"Beck",
"R.",
""
]
] |
0708.1534 | Moritz Karbach | The BABAR Collaboration: B. Aubert, et al | Measurement of branching fraction and CP asymmetries in B->D0(cp)K
decays | 17 pages, 15 postscript figures, contributed to Lepton Photon 2007 | null | null | BABAR-CONF-07/006, SLAC-PUB-12696 | hep-ex | null | We present a preliminary study of $B^- \to D^0_{CP} \pi^-$ and $B^- \to
D^0_{CP} K^-$ decays, with the $D^0_{CP}$ reconstructed in the CP-odd
eigenstates $K_s \pi^0$, $K_s \omega$, in the CP-even eigenstates $K^+ K^-$,
$\pi^+ \pi^-$, and in the (non-CP) flavor eigenstate $K^\mp \pi^\pm$. Using a
sample of about 382 million Y(4S) decays into BBbar pairs, collected with the
BABAR detector operating at the PEP-II asymmetric-energy B Factory at SLAC, we
measure the ratios of the branching fractions R_CP+- and the direct CP
asymmetries A_CP+-. The results are:
R_CP- = 0.81 \pm 0.10 (stat) \pm 0.05 (syst)
R_CP+ = 1.07 \pm 0.10 (stat) \pm 0.04 (syst)
A_CP- = -0.19 \pm 0.12 (stat) \pm 0.02 (syst)
A_CP+ = 0.35 \pm 0.09 (stat) \pm 0.05 (syst)
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 00:46:23 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.1535 | Imam Fachruddin | I. Fachruddin, Ch. Elster and W. Gloeckle | Three-Nucleon Scattering at Intermediate Energies | 5 pages, 5 figures, Proceeding of the Third Asia-Pacific Conference
on Few-Body Problem in Physics, Nakhon Ratchasima, Thailand, July 26-30 2005 | null | 10.1142/9789812706881_0016 | null | nucl-th | null | By means of a technique, which does not employ partial wave (PW)
decompositions, the nucleon-deuteron break-up process is evaluated in the
Faddeev scheme, where only the leading order term of the amplitude is
considered. This technique is then applied to calculate the semi-exclusive
proton-deuteron break-up reaction d(p,n)pp for proton laboratory energies Elab
of a few hundred MeV. A comparison with PW calculations is performed at 197 MeV
projectile energy. At the same energy rescattering processes, which are not
included in the 3D calculations yet, are shown to be still important in the
full Faddeev PW calculations, especially for the cross section and the
analyzing power Ay. Next, kinematical relativistic effects are investigated for
projectile energies up to about 500 MeV. At the higher energies, those
relativistic effects start not to be negligible, especially in the peak of the
cross section.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 00:59:58 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Fachruddin",
"I.",
""
],
[
"Elster",
"Ch.",
""
],
[
"Gloeckle",
"W.",
""
]
] |
0708.1536 | Ravi Gomatam | R. Gomatam | Physics and Commonsense - Reassessing the connection in the light of
quantum theory | 37 pages (including 4 figures); a few sentence constructions improved | null | null | null | quant-ph | null | Scientific realism in classical (i.e. pre-quantum) physics has remained
compatible with the naive realism of everyday thinking on the whole; whereas it
has proven impossible to find any consistent way to visualize the world
underlying quantum theory in terms of our pictures in the everyday world. The
general conclusion is that in quantum theory naive realism, although necessary
at the level of observations, fails at the microscopic level. In this paper I
offer a counter view that what fails in quantum theory is naive realism at the
level of observations itself.
| [
{
"version": "v1",
"created": "Sun, 12 Aug 2007 04:43:27 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Gomatam",
"R.",
""
]
] |
0708.1537 | Tiberiu Harko | Christian G. Boehmer, Tiberiu Harko, Francisco S. N. Lobo | Conformally symmetric traversable wormholes | 8 pages, 1 figure, references added; minor changes, accepted for
publication in PRD | Phys.Rev.D76:084014,2007 | 10.1103/PhysRevD.76.084014 | null | gr-qc astro-ph hep-th | null | Exact solutions of traversable wormholes are found under the assumption of
spherical symmetry and the existence of a {\it non-static} conformal symmetry,
which presents a more systematic approach in searching for exact wormhole
solutions. In this work, a wide variety of solutions are deduced by considering
choices for the form function, a specific linear equation of state relating the
energy density and the pressure anisotropy, and various phantom wormhole
geometries are explored. A large class of solutions impose that the spatial
distribution of the exotic matter is restricted to the throat neighborhood,
with a cut-off of the stress-energy tensor at a finite junction interface,
although asymptotically flat exact solutions are also found. Using the ``volume
integral quantifier,'' it is found that the conformally symmetric phantom
wormhole geometries may, in principle, be constructed by infinitesimally small
amounts of averaged null energy condition violating matter. Considering the
tidal acceleration traversability conditions for the phantom wormhole geometry,
specific wormhole dimensions and the traversal velocity are also deduced.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 09:20:53 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 02:36:03 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Aug 2007 03:13:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] |
0708.1538 | Peter Krawitz | P. Krawitz, I. Shmulevich | Entropy of complex relevant components of Boolean networks | 8 pages, 6 figures | null | 10.1103/PhysRevE.76.036115 | null | cond-mat.dis-nn | null | Boolean network models of strongly connected modules are capable of capturing
the high regulatory complexity of many biological gene regulatory circuits. We
study numerically the previously introduced basin entropy, a parameter for the
dynamical uncertainty or information storage capacity of a network as well as
the average transient time in random relevant components as a function of their
connectivity. We also demonstrate that basin entropy can be estimated from
time-series data and is therefore also applicable to non-deterministic networks
models.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 03:07:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Krawitz",
"P.",
""
],
[
"Shmulevich",
"I.",
""
]
] |
0708.1539 | Paul Busch | Werner Stulpe and Paul Busch | The Structure of Classical Extensions of Quantum Probability Theory | null | J. Math. Phys. 49 (2008) 032104/1-22 | 10.1063/1.2884581 | null | quant-ph | null | On the basis of a suggestive definition of a classical extension of quantum
mechanics in terms of statistical models, we prove that every such classical
extension is essentially given by the so-called Misra-Bugajski reduction map.
We consider how this map enables one to understand quantum mechanics as a
reduced classical statistical theory on the projective Hilbert space as phase
space and discuss features of the induced hidden-variables model. Moreover,
some relevant technical results on the topology and Borel structure of the
projective Hilbert space are reviewed.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 03:37:30 GMT"
}
] | 2008-04-04T00:00:00 | [
[
"Stulpe",
"Werner",
""
],
[
"Busch",
"Paul",
""
]
] |
0708.1540 | Maximilian Puelma Touzel Mr. | M.A.P. Touzel, R.B.A. Adamson, A.M. Steinberg | Optimal bounded-error strategies for projective measurements in
non-orthogonal state discrimination | 7 pages, 4 figures, Revtex4 | null | 10.1103/PhysRevA.76.062314 | null | quant-ph | null | Research in non-orthogonal state discrimination has given rise to two
conventional optimal strategies: unambiguous discrimination (UD) and minimum
error (ME) discrimination. This paper explores the experimentally relevant
range of measurement strategies between the two, where the rate of inconclusive
results is minimized for a bounded-error rate. We first provide some
constraints on the problem that apply to generalized measurements (POVMs). We
then provide the theory for the optimal projective measurement (PVM) in this
range. Through analytical and numerical results we investigate this family of
projective, bounded-error strategies and compare it to the POVM family as well
as to experimental implementation of UD using POVMs. We also discuss a possible
application of these bounded-error strategies to quantum key distribution.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 17:13:38 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 20:44:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Touzel",
"M. A. P.",
""
],
[
"Adamson",
"R. B. A.",
""
],
[
"Steinberg",
"A. M.",
""
]
] |
0708.1541 | Shosuke Sasaki | Shosuke Sasaki | Energy Spectra for Fractional Quantum Hall States | 5 pages, 3 figures | null | 10.1088/1742-6596/100/4/042021 | null | cond-mat.mes-hall cond-mat.str-el | null | Fractional quantum Hall states (FQHS) with the filling factor nu = p/q of q <
21 are examined and their energies are calculated. The classical Coulomb energy
is evaluated among many electrons; that energy is linearly dependent on 1/nu.
The residual binding energies are also evaluated. The electron pair in nearest
Landau-orbitals is more affected via Coulomb transition than an electron pair
in non-nearest orbitals. Each nearest electron pair can transfer to some empty
orbital pair, but it cannot transfer to the other empty orbital pair because of
conservation of momentum. Counting the numbers of the allowed and forbidden
transitions, the binding energies are evaluated for filling factors of 126
fraction numbers. Gathering the classical Coulomb energy and the pair
transition energy, we obtain the spectrum of energy versus nu. This energy
spectrum elucidates the precise confinement of Hall resistance at specific
fractional filling factors.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 04:44:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sasaki",
"Shosuke",
""
]
] |
0708.1542 | Ilya Zaliapin | Andrei Gabrielov, Vladimir Keilis-Borok, Ilya Zaliapin | Predictability of extreme events in a branching diffusion model | 4 pages, 2 figures | null | null | null | nlin.AO | null | We propose a framework for studying predictability of extreme events in
complex systems. Major conceptual elements -- direct cascading or
fragmentation, spatial dynamics, and external driving -- are combined in a
classical age-dependent multi-type branching diffusion process with
immigration. A complete analytic description of the size- and space-dependent
distributions of particles is derived. We then formulate an extreme event
prediction problem and determine characteristic patterns of the system behavior
as an extreme event approaches. In particlular, our results imply specific
premonitory deviations from self-similarity, which have been heuristically
observed in real-world and modeled complex systems. Our results suggest a
simple universal mechanism of such premonitory patterns and natural framework
for their analytic study.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 05:11:50 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Gabrielov",
"Andrei",
""
],
[
"Keilis-Borok",
"Vladimir",
""
],
[
"Zaliapin",
"Ilya",
""
]
] |
0708.1543 | Kouichi Hagino | K. Hagino and H. Sagawa | Dipole excitation and geometry of borromean nuclei | 4 pages, 4 eps figures | Phys.Rev.C76:047302,2007 | 10.1103/PhysRevC.76.047302 | null | nucl-th | null | We analyze the Coulomb breakup cross sections of $^{11}$Li and $^6$He nuclei
using a three-body model with a density-dependent contact interaction. We show
that the concentration of the B(E1) strength near the threshold can be well
reproduced with this model. With the help of the calculated B(E1) value, we
extract the root-mean-square (rms) distance between the core nucleus and the
center of mass of two valence neutrons without resorting to the sum rule, which
may suffer from unphysical Pauli forbidden transitions. Together with the
empirical rms distance between the neutrons obtained from the matter radius
study and also from the three-body correlation study in the break-up reaction,
we convert these rms distances to the mean opening angle between the valence
neutrons from the core nucleus. We find that the obtained mean opening angles
in $^{11}$Li and $^6$He agree with the three-body model predictions.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 05:46:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hagino",
"K.",
""
],
[
"Sagawa",
"H.",
""
]
] |
0708.1544 | Chih-Hsiang Cheng | The BABAR Collaboration: B. Aubert, et al | Measurement of cos2beta in B0->D(*)h0 Decays with a Time-Dependent
Dalitz Plot Analysis of D->KSpi+pi- | 7 pages, 3 figures, submitted to Physical Review Letters | Phys.Rev.Lett.99:231802,2007 | 10.1103/PhysRevLett.99.231802 | BABAR-PUB-07/047, SLAC-PUB-12727 | hep-ex | null | We study the time-dependent Dalitz plot of D->KSpi+pi- in B0->D(*)h0 decays,
where h0 is a pi0, eta, eta', or omega meson and D*->Dpi0 using a data sample
of 383 X 10^6 Upsilon(4S)->BBbar decays collected with the BABAR detector. We
determine cos2beta = 0.42+-0.49+-0.09+-0.13, sin2beta = 0.29+-0.34+-0.03+-0.05,
and |lambda| = 1.01+-0.08+-0.02, where the first error is statistical, the
second is the experimental systematic uncertainty, and the third, where given,
is the Dalitz model uncertainty. Assuming the world average value for sin2beta
and |lambda|=1, cos2beta>0 is preferred over cos2beta<0 at 86% confidence
level.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 05:55:35 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.1545 | Charles Liu | Charles T. Liu (1), Peter Capak (2), Bahram Mobasher (3), Timothy A.
D. Paglione (4), R. Michael Rich (5), Nicholas Z. Scoville (2), Shana M.
Tribiano (6), and Neil D. Tyson (7) ((1) CUNY College of Staten Island, (2)
Caltech, (3) STScI, (4) CUNY York College, (5) UCLA, (6) CUNY BMCC, (7) AMNH) | The Faint End Slopes Of Galaxy Luminosity Functions In The COSMOS
2-Square Degree Field | 24 pages including 5 figures, accepted to ApJS | null | 10.1086/522361 | null | astro-ph | null | We examine the faint-end slope of the rest-frame V-band luminosity function
(LF), with respect to galaxy spectral type, of field galaxies with redshift
z<0.5, using a sample of 80,820 galaxies with photometric redshifts in the
Cosmic Evolution Survey (COSMOS) field. For all galaxy spectral types combined,
the LF slope, alpha, ranges from -1.24 to -1.12, from the lowest redshift bin
to the highest. In the lowest redshift bin (0.02<z<0.1), where the magnitude
limit is M(V) ~ -13, the slope ranges from ~ -1.1 for galaxies with early-type
spectral energy distributions (SEDs), to ~ -1.9 for galaxies with
low-extinction starburst SEDs. In each galaxy SED category (Ell, Sbc, Scd/Irr,
and starburst), the faint-end slopes grow shallower with increasing redshift;
in the highest redshift bin (0.4<z<0.5), the slope is ~ -0.5 and ~ -1.3 for
early-types and starbursts respectively. The steepness of alpha at lower
redshift could be qualitatively explained by large numbers of faint dwarf
galaxies, perhaps of low surface brightness, which are not detected at higher
redshifts.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 14:29:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liu",
"Charles T.",
""
],
[
"Capak",
"Peter",
""
],
[
"Mobasher",
"Bahram",
""
],
[
"Paglione",
"Timothy A. D.",
""
],
[
"Rich",
"R. Michael",
""
],
[
"Scoville",
"Nicholas Z.",
""
],
[
"Tribiano",
"Shana M.",
""
],
[
"Tyson",
"Neil D.",
""
]
] |
0708.1546 | Frank Bridges | Y. Jiang, F. Bridges, L. Downward, J. J. Neumeier | Relationship between macroscopic physical properties and local
distortions of low doping La{1-x}Ca{x}MnO3: an EXAFS study | 27 pages, 8 figures, to be submitted to Phys. Rev. B | null | 10.1103/PhysRevB.76.224428 | null | cond-mat.str-el | null | A temperature-dependent EXAFS investigation of La{1-x}Ca{x}MnO3 is presented
for the concentration range that spans the ferromagnetic-insulator (FMI) to
ferromagnetic-metal (FMM) transition region, x = 0.16-0.22. The samples are
insulating for x = 0.16-0.2 and show a metal/insulator transition for x = 0.22.
All samples are ferromagnetic although the saturation magnetization for the 16%
Ca sample is only ~ 70% of the expected value at 0.4T. We find that the FMI
samples have similar correlations between changes in the local Mn-O distortions
and the magnetization as observed previously for the colossal magnetoresistance
(CMR) samples (0.2 < x < 0.5) - except that the FMI samples never become fully
magnetized. The data show that there are at least two distinct types of
distortions. The initial distortions removed as the insulating sample becomes
magnetized are small and provides direct evidence that roughly 50% of the Mn
sites have a small distortion/site and are magnetized first. The large
remaining Mn-O distortions at low T are attributed to a small fraction of
Jahn-Teller-distorted Mn sites that are either antiferromagnetically ordered or
unmagnetized. Thus the insulating samples are very similar to the behavior of
the CMR samples up to the point at which the M/I transition occurs for the CMR
materials. The lack of metallic conductivity for x <= 0.2, when 50% or more of
the sample is magnetic, implies that there must be preferred magnetized Mn
sites and that such sites do not percolate at these concentrations.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 07:10:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jiang",
"Y.",
""
],
[
"Bridges",
"F.",
""
],
[
"Downward",
"L.",
""
],
[
"Neumeier",
"J. J.",
""
]
] |
0708.1547 | Michael Goldberg | Michael Goldberg | Strichartz Estimates for the Schroedinger Equation with Time-Periodic
L^{n/2} Potentials | 21 pages. Added L^2 stability statement to main theorem, as it was
already implicit in the proof | null | null | null | math.AP math-ph math.MP | null | We prove Strichartz estimates for the Schroedinger operator $H = -\Delta +
V(t,x)$ with time-periodic complex potentials $V$ belonging to the
scaling-critical space $L^{n/2}_x L^\infty_t$ in dimensions $n \ge 3$. This is
done directly from estimates on the resolvent rather than using dispersive
bounds, as the latter generally require a stronger regularity condition than
what is stated above. In typical fashion, we project onto the continuous
spectrum of the operator and must assume an absence of resonances. Eigenvalues
are permissible at any location in the spectrum, including at threshold
energies, provided that the associated eigenfunction decays sufficiently
rapidly.
| [
{
"version": "v1",
"created": "Mon, 13 Aug 2007 00:46:05 GMT"
},
{
"version": "v2",
"created": "Sat, 3 Nov 2007 05:08:48 GMT"
}
] | 2007-11-03T00:00:00 | [
[
"Goldberg",
"Michael",
""
]
] |
0708.1548 | Galina L. Klimchitskaya | B. Geyer, G. L. Klimchitskaya, U. Mohideen and V. M. Mostepanenko | Comment on ``Precision measurement of the Casimir-Lifshitz force in a
fluid'' | 5 pages, 1 figure, submitted to Physical Review A; corrections are
made in accordance to referee's suggestions | Phys. Rev. A, v.77, N3, p.036102-(1-3) (2008). | 10.1103/PhysRevA.77.036102 | null | physics.atom-ph cond-mat.stat-mech physics.gen-ph quant-ph | null | Recently J.N. Munday and F. Capasso [Phys. Rev. A {\bf 75}, 060102(R) (2007);
arXiv:0705.3793] claimed that they have performed a precision measurement of
the Casimir force between a sphere and a plate coated with Au, both immersed in
ethanol. The measurement results were claimed to be consistent with the
Lifshitz theory. We demonstrate that the calculation of the Casimir force
between the smooth bodies following the authors prescription has a discrepancy
up to 25% with respect to authors result. We show also that the attractive
electrostatic force only due to the surface potential differences was
underestimated by a factor of 590 and the charge double layer interaction was
not taken into account. All this leads to the conclusion that the results of
this experiment are in fact uncertain.
| [
{
"version": "v1",
"created": "Sat, 11 Aug 2007 07:50:59 GMT"
},
{
"version": "v2",
"created": "Fri, 16 Nov 2007 12:50:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Geyer",
"B.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mohideen",
"U.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] |
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