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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.3898 | Andrei Khrennikov | Andrei Khrennikov | Quantum-like Representation of Macroscopic Configurations | null | Lecture Notes in Artificial Intelligence, 5494, 44-58 (2009) | null | null | quant-ph | null | The aim of this paper is to apply a contextual probabilistic model (in the
spirit of Mackey, Gudder, Ballentine) to represent and to generalize some
results of quantum logic about possible macroscopic quantum-like (QL)
behaviour. The crucial point is that our model provides QL-representation of
macroscopic configurations in terms of complex probability amplitudes -- wave
functions of such configurations. Thus, instead of the language of propositions
which is common in quatum logic, we use the language of wave functions which is
common in the conventional presentation of QM. We propose a quantum-like
representation algorithm, QLRA, which maps probabilistic data of any origin in
complex (or even hyperbolic) Hilbert space. On the one hand, this paper
clarifyes some questions in foundations of QM, since some rather mystical
quantum features are illustrated on the basis of behavior of macroscopic
systems. On the other hand, the approach developed in this paper may be used
e.g. in biology, sociology, or psychology. Our example of QL-representation of
hidden macroscopic configurations can find natural applications in those
domains of science.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 15:34:05 GMT"
}
] | 2014-03-13T00:00:00 | [
[
"Khrennikov",
"Andrei",
""
]
] |
0705.3899 | Juan Jose Sanz-Cillero | L.Y. Xiao and J.J. Sanz-Cillero | Renormalizable Sectors in Resonance Chiral Theory: S -> pi pi Decay
Amplitude | 4 pages | Phys.Lett.B659:452-456,2008 | 10.1016/j.physletb.2007.10.080 | null | hep-ph hep-th | null | We develop a resonance chiral theory without any a priori limitation on the
number of derivatives in the hadronic operators. Through an exhaustive analysis
of the resonance lagrangian and by means of field redefinitions, we find that
the number of independent operator contributing to the S -> pi pi decay
amplitude is finite: there is only one single-trace operator (the cd term) and
three multi-trace terms. The deep implication of this fact is that the
ultraviolet divergences that appear in this amplitude at the loop level can
only appear through these chiral invariant structures. Hence, a renormalization
of these couplings renders the amplitude finite.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 16:24:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Xiao",
"L. Y.",
""
],
[
"Sanz-Cillero",
"J. J.",
""
]
] |
0705.3900 | Pasquale Sodano | F. P. Mancini, P. Sodano, A. Trombettoni | Spatially Inhomogeneous Superconducting and Bosonic Networks With
Emergent Complex Behaviors | invited review paper, 32 pages, 8 figures | Int. J. Mod. Phys. B21, 1923 (2007) | 10.1142/S0217979207037181 | DFUPFG: 39-07 | cond-mat.supr-con cond-mat.dis-nn | null | The spontaneous emergence of enhanced responses and local orders are
properties often associated with complex matter where nonlinearities and
spatial inhomogeneities dominate. We discuss these phenomena in quantum devices
realized with superconducting Josephson junction networks and cold atoms in
optical lattices. We evidence how the pertinent engineering of the network's
shape induces the enhancement of the zero-voltage Josephson critical currents
in superconducting arrays as well as the emergence of spatially localized
condensates for cold atoms in inhomogeneous optical lattices.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 16:49:15 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Mancini",
"F. P.",
""
],
[
"Sodano",
"P.",
""
],
[
"Trombettoni",
"A.",
""
]
] |
0705.3901 | Cullen Blake | Cullen H. Blake, David Charbonneau, Russel J. White, Mark S. Marley,
Didier Saumon | Multiepoch Radial Velocity Observations of L Dwarfs | Accepted for publication in ApJ, 24 pages, 7 figures | Astrophys.J.666:1198-1204,2007 | 10.1086/520124 | null | astro-ph | null | We report on the development of a technique for precise radial-velocity
measurements of cool stars and brown dwarfs in the near infrared. Our technique
is analogous to the Iodine (I2) absorption cell method that has proven so
successful in the optical regime. We rely on telluric CH4 absorption features
to serve as a wavelength reference, relative to which we measure Doppler shifts
of the CO and H2O features in the spectra of our targets. We apply this
technique to high-resolution (R~50,000) spectra near 2.3 micron of nine L
dwarfs taken with the Phoenix instrument on Gemini-South and demonstrate a
typical precision of 300 m/s. We conduct simulations to estimate our expected
precision and show our performance is currently limited by the signal-to-noise
of our data. We present estimates of the rotational velocities and systemic
velocities of our targets. With our current data, we are sensitive to
companions with M sin i > 2MJ in orbits with periods less than three days. We
identify no companions in our current data set. Future observations with
improved signal-to-noise should result in radial-velocity precision of 100 m/s
for L dwarfs.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 17:00:47 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Blake",
"Cullen H.",
""
],
[
"Charbonneau",
"David",
""
],
[
"White",
"Russel J.",
""
],
[
"Marley",
"Mark S.",
""
],
[
"Saumon",
"Didier",
""
]
] |
0705.3902 | Marco Spaans | M. Spaans | A Derivation of Einstein Gravity without the Axiom of Choice: Topology
Hidden in GR | final edits: more detail on derivation of equations of motion for q | null | null | null | gr-qc hep-th math-ph math.MP | null | A derivation of the equations of motion of general relativity is presented
that does not invoke the Axiom of Choice, but requires the explicit
construction of a choice function q for continuous three-space regions. The
motivation for this (seemingly academic) endeavour is to take the background
independence intrinsic to Einstein gravity one step further, and to assure that
both the equations of motion and the way in which those equations of motion are
derived are as self-consistent as possible. That is, solutions to the equations
of motion of general relativity endow a three-space region with a physical and
distinguishing geometry in four-dimensional space-time. However, in order to
derive these equations of motion one should first be able to choose a
three-space region without having any prior knowledge of its physically
appropriate geometry. The expression of this choice process requires a
three-dimensional topological manifold Q, to which all considered three-space
regions belong, and that generates an equation of motion whose solutions are q.
These solutions relate the effects of curvature to the source term through the
topology of Q and constitute Einstein gravity. Q is given by 2T^3+3S^1xS^2, and
is embedded in four dimensions. This points toward a hidden topological content
for general relativity, best phrased as: Q and q provide a structure for how to
choose a three-space region irrespective of what geometric properties it has,
while at the same time Q and q determine that only GR can endow a three-space
with those geometric properties. In this sense, avoiding the Axiom of Choice
allows one to gain physical insight into GR. Possible links with holography are
pointed out.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 17:30:42 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 19:45:13 GMT"
},
{
"version": "v3",
"created": "Sun, 17 Jun 2007 19:57:11 GMT"
}
] | 2007-06-17T00:00:00 | [
[
"Spaans",
"M.",
""
]
] |
0705.3903 | Claus Michael Ringel | Claus Michael Ringel | The Self-injective Cluster Tilted Algebras | null | null | null | null | math.RT math.CO | null | We are going to determine all the self-injective cluster tilted algebras. All
are of finite representation type and special biserial.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 17:16:43 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Ringel",
"Claus Michael",
""
]
] |
0705.3904 | Gui Lu Long | Dan Liu, Xin Zhao and Gui Lu Long | Multiple Entropy Measures for Multipartite Quantum Entanglement | 4 pages and 4 figures. references added | null | null | null | quant-ph | null | A new entanglement measure, the multiple entropy measures (MEMS), is proposed
to quantify quantum entanglement of multi-partite quantum state. The MEMS is
vector-like with $m=[N/2]$, the integer part of $N/2$, components: $[S_1,
S_2,..., S_m]$, and the $i$-th component $S_i$ is the geometric mean of
$i$-body partial entropy of the system. The $S_i$ measures how strong an
arbitrary $i$ bodies from the system are entangled with the rest of the system.
The MEMS is not only transparent in physical picture, but also simple to
calculate. It satisfies the conditions for a good entanglement measure. We have
analyzed the entanglement properties of the GHZ-state, the W-states and
cluster-states under MEMS. The cluster-state is more entangled than the
GHZ-state and W-state under MEMS.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 17:16:53 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 09:45:43 GMT"
},
{
"version": "v3",
"created": "Mon, 11 Jun 2007 16:30:33 GMT"
},
{
"version": "v4",
"created": "Fri, 22 Jun 2007 23:54:14 GMT"
}
] | 2007-06-23T00:00:00 | [
[
"Liu",
"Dan",
""
],
[
"Zhao",
"Xin",
""
],
[
"Long",
"Gui Lu",
""
]
] |
0705.3905 | Claus Michael Ringel | Claus Michael Ringel | The Ladder Construction of Pruefer Modules | null | null | null | null | math.RT math.RA | null | Let R be a ring (associative, with 1). A non-zero module M is said to be a
Pruefer module provided there exists a surjective, locally nilpotent
endomorphism with kernel of finite length. The aim of this note is construct
Pruefer modules starting from a pair of module homomorphisms w,v: U_0 -> U_1,
where w is injective and its cokernel is of finite length.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 17:26:04 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Ringel",
"Claus Michael",
""
]
] |
0705.3906 | Dmitri Prokhorenko | D.V. Prokhorenko | Renormalization of Gauge theories and the Hopf Algebra of Diagrams | null | null | null | null | hep-th | null | In 1999 A. Connes and D. Kreimer have discovered a Hopf algebra structure on
the Feynman graphs of scalar field theory. They have found that the
renormalization can be interpreted as a solving of some Riemann - Hilbert
problem. In this work the generalization of their scheme to the case of
nonabelian gauge theories is proposed. The action of the gauge group on the
Hopf algebra is defined and the proof that this action is in consistent with
the Hopf algebra structure is given. The scetch of new proof of S-matrix, based
on the Hopf algebra is given.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 18:10:12 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Prokhorenko",
"D. V.",
""
]
] |
0705.3907 | Dmitri Prokhorenko | D.V. Prokhorenko | Squares of White Noise, SL(2,C) and Kubo - Martin -Schwinger States | null | null | null | null | math-ph math.MP | null | We investigate the structure of Kubo - Martin - Schwinger (KMS) states on
some extension of the universal enveloping algebra of SL(2,C}. We find that
there exists a one-to-one correspondence between the set of all covariant KMS
states on this algebra and the set of all probability measures d\mu on the real
half-line, which decrease faster than any inverse polynomial. This problem is
connected to the problem of KMS states on square of white noise algebra.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 18:48:02 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Prokhorenko",
"D. V.",
""
]
] |
0705.3908 | Andrew Gould | Andrew Gould | Microlens Parallax Measurements with a Warm Spitzer | 6 pages + 1 Figure, To be presented at The Warm Spitzer Mission
Workshop, 4-5 June 2007, Pasadena | AIP Conf.Proc.943:215-220,2007 | 10.1063/1.2806780 | null | astro-ph | null | Because Spitzer is an Earth-trailing orbit, losing about 0.1 AU/yr, it is
excellently located to perform microlens parallax observations toward the
Magellanic Clouds (LMC/SMC) and the Galactic bulge. These yield the so-called
``projected velocity'' of the lens, which can distinguish statistically among
different populations. A few such measurements toward the LMC/SMC would reveal
the nature of the lenses being detected in this direction (dark halo objects,
or ordinary LMC/SMC stars). Cool Spitzer has already made one such measurement
of a (rare) bright red-clump source, but warm (presumably less oversubscribed)
Spitzer could devote the extra time required to obtain microlens parallaxes for
the more common, but fainter, turnoff sources. Warm Spitzer could observe bulge
microlenses for 38 days per year, which would permit up to 24 microlens
parallaxes per year. This would yield interesting information on the disk mass
function, particularly old brown dwarfs, which at present are inaccessible by
other techniques. Target-of-Opportunity (TOO) observations should be divided
into RTOO/DTOO, i.e., ``regular'' and ``disruptive'' TOOs, as pioneered by the
Space Interferometry Mission (SIM). LMC/SMC parallax measurements would be
DTOO, but bulge measurements would be RTOO, i.e., they could be scheduled in
advance, without knowing exactly which star was to be observed.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 19:18:03 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Gould",
"Andrew",
""
]
] |
0705.3909 | Cristina Manuel | Cristina Manuel and Felipe Llanes-Estrada | Bulk viscosity in a cold CFL superfluid | 19 pages, 2 figures; one reference added, version to be published in
JCAP | JCAP0708:001,2007 | 10.1088/1475-7516/2007/08/001 | null | hep-ph | null | We compute one of the bulk viscosity coefficients of cold CFL quark matter in
the temperature regime where the contribution of mesons, quarks and gluons to
transport phenomena is Boltzmann suppressed. In that regime dissipation occurs
due to collisions of superfluid phonons, the Goldstone modes associated to the
spontaneous breaking of baryon symmetry. We first review the hydrodynamics of
relativistic superfluids, and remind that there are at least three bulk
viscosity coefficients in these systems. We then compute the bulk viscosity
coefficient associated to the normal fluid component of the superfluid. In our
analysis we use Son's effective field theory for the superfluid phonon, amended
to include scale breaking effects proportional to the square of the strange
quark mass m_s. We compute the bulk viscosity at leading order in the scale
breaking parameter, and find that it is dominated by collinear splitting and
joining processes. The resulting transport coefficient is zeta=0.011 m_s^4/T,
growing at low temperature T until the phonon fluid description stops making
sense. Our results are relevant to study the rotational properties of a compact
star formed by CFL quark matter.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 19:42:47 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 16:10:45 GMT"
},
{
"version": "v3",
"created": "Wed, 18 Jul 2007 12:29:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Manuel",
"Cristina",
""
],
[
"Llanes-Estrada",
"Felipe",
""
]
] |
0705.3910 | Pedro A. Movilla Fernandez | Pedro A. Movilla Fernandez (for the CDF and D0 collaborations) | Precision Determination of the Top Quark Mass | 14 pages, 4 figures; LaTeX2e, 8 .eps files, uses LaThuileFPSpro.sty
(included). To appear in the proceedings of the 21st Rencontres des Physique
de la Vallee d'Aoste, La Thuile, March 4-10, 2007 | Frascati Phys.Ser.44:259-272,2007 | null | FERMILAB-CONF-07-138-E | hep-ex | null | The CDF and D0 collaborations have updated their measurements of the mass of
the top quark using proton-antiproton collisions at sqrt{s}=1.96TeV produced at
the Tevatron. The uncertainties in each of the of top-antitop decay channels
have been reduced. The new Tevatron average for the mass of the top quark based
on about 1/fb of data per experiment is 170.9+-1.8GeV/c^2.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 21:49:36 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Fernandez",
"Pedro A. Movilla",
"",
"for the CDF and D0 collaborations"
]
] |
0705.3911 | Thomas Markwig | Thomas Markwig | A Note on Equimultiple Deformations | 11 pages | null | null | null | math.AG | null | While the tangent space to an equisingular family of curves can be discribed
by the sections of a twisted ideal sheaf, this is no longer true if we only
prescribe the multiplicity which a singular point should have. However, it is
still possible to compute the dimension of the tangent space with the aid of
the equimulitplicity ideal. In this note we consider families L_m={(C,p) |
mult_p(C)=m} with C in some linear system |L| on a smooth projective surface S
and for a fixed positive integer m, and we compute the dimension of the tangent
space to L_m at a point (C,p) depending on whether p is a unitangential
singular point of C or not. We deduce that the expected dimension of L_m at
(C,p) in any case is just dim|L|+2-m*(m+1)/2. The result is used in the study
of triple-point defective surfaces in some joint papers with Luca Chiantini.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 21:51:35 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Markwig",
"Thomas",
""
]
] |
0705.3912 | Thomas Markwig | Luca Chiantini, Thomas Markwig | Triple-Point Defective Regular Surfaces | The results of this paper have been generalised in the paper Triple
point defective surfaces (arXiv:0911.1222) by the same authors. The
assumptions on the linear system and on the surface have been weakened. Large
parts of the new paper coincide with this old paper and the reader should
rather refer to the new paper than to this old one | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the linear series |L-3p| of hyperplane sections with a
triple point p of a surface S embedded via a very ample line bundle L for a
general point p. If this linear series does not have the expected dimension we
call (S,L) triple-point defective. We show that on a triple-point defective
regular surface through a general point every hyperplane section has either a
triple component or the surface is rationally ruled and the hyperplane section
contains twice a fibre of the ruling.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 22:10:04 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Nov 2009 11:06:42 GMT"
}
] | 2009-11-06T00:00:00 | [
[
"Chiantini",
"Luca",
""
],
[
"Markwig",
"Thomas",
""
]
] |
0705.3913 | Thomas Markwig | Luca Chiantini, Thomas Markwig | Triple-Point Defective Ruled Surfaces | 15 pages | J. Pure Appl. Alg. 212,6 (2008), 1337-1346 | null | null | math.AG | null | In arXive:0705.3912 we studied triple-point defective very ample linear
systems on regular surfaces, and we showed that they can only exist if the
surface is ruled. In the present paper we show that we can drop the regularity
assumption, and we classify the triple-point defective very ample linear
systems on ruled surfaces.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 22:20:29 GMT"
}
] | 2009-10-01T00:00:00 | [
[
"Chiantini",
"Luca",
""
],
[
"Markwig",
"Thomas",
""
]
] |
0705.3914 | Yaacov Kopeliovich | Yaacov Kopeliovich | Modular equations of order $p$ and Theta functions | 7 pages expanded proofs fixed references and grammar errors to appear
in albanian journal of mathematics | null | null | null | math.CV math.NT | null | An algorithm to obtain equations between theta functions with integral
characteristics evaluated at $\tau$ and $p\tau$ for $g>1$ is presented.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 22:23:17 GMT"
},
{
"version": "v2",
"created": "Sun, 9 Dec 2007 19:44:08 GMT"
}
] | 2007-12-09T00:00:00 | [
[
"Kopeliovich",
"Yaacov",
""
]
] |
0705.3915 | Alakabha Datta | Alakabha Datta, Andrei V. Gritsan, David London, Makiko Nagashima and
Alejandro Szynkman | Testing Explanations of the $B\to\phi K^*$ Polarization Puzzle | 15 pages, 2 figures. Added reference and PACS numbers. To appear in
PRD | Phys.Rev.D76:034015,2007 | 10.1103/PhysRevD.76.034015 | UMiss-HEP-2007-03 and UdeM-GPP-TH-07-160 | hep-ph hep-ex | null | $B\to\phi K^*$ ($\btos$) is three separate decays, one for each polarization
of the final-state vector mesons (one longitudinal, two transverse). It is
observed that the fraction of transverse decays, $\fT$, and the fraction of
longitudinal decays, $\fL$, are roughly equal: $\fTfL \simeq 1$, in opposition
to the naive expectation that $\fT \ll \fL$. If one requires a single
explanation of all polarization puzzles, two possibilities remain within the
standard model: penguin annihilation and rescattering. In this paper we examine
the predictions of these two explanations for $\fTfL$ in $\btod$ decays. In $B
\to \rho\rho$ decays, only $\bd \to \rho^0\rho^0$ can possibly exhibit a large
$\fTfL$. In B decays related by U-spin, we find two promising possibilities:
(i) $B^+ \to K^{*0} \rho^+$ ($\btos$) and $B^+ \to \Kbar^{*0} K^{*+}$ ($\btod$)
and (ii) $\bs \to K^{*0} \Kbar^{*0}$ ($\btos$) and $\bd \to \Kbar^{*0} K^{*0}$
($\btod$). The measurement of $\fTfL$ in these pairs of decays will allow us to
test penguin annihilation and rescattering. Finally, it is possible to
distinguish penguin annihilation from rescattering by performing a
time-dependent angular analysis of $\bd \to \Kbar^{*0} K^{*0}$.
| [
{
"version": "v1",
"created": "Sat, 26 May 2007 23:07:21 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 16:56:06 GMT"
},
{
"version": "v3",
"created": "Sat, 21 Jul 2007 05:03:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Datta",
"Alakabha",
""
],
[
"Gritsan",
"Andrei V.",
""
],
[
"London",
"David",
""
],
[
"Nagashima",
"Makiko",
""
],
[
"Szynkman",
"Alejandro",
""
]
] |
0705.3916 | Geusa Marques AMarques | Geusa de A. Marques | Analogue of superradiance effect in acoustic black hole in the presence
of disclination | No figures | null | null | null | gr-qc | null | In this paper we invstigate the possibility of the acoustic analogue of a
phenomenon like superradiance, that is, the amplification of a sound wave by
reflection from the ergo-region of a rotating acoustic black hole in the fluid
"draining bathtub" model in the presence of a desclination be amplified or
reduced in agreement with the value of the deficit angle.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 00:12:33 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Marques",
"Geusa de A.",
""
]
] |
0705.3917 | Caryl Gronwall | C. Gronwall, R. Ciardullo, T. Hickey, E. Gawaiser, J. J. Feldmeier, P.
G. van Dokkum, C. M. Urry, D. Herrera, B. D. Lehmer, L. Infante, A. Orsi, D.
Marchesini, G. A. Blanc, H. Francke, P. Lira, and E. Treister | Ly-alpha Emission-Line Galaxies at z = 3.1 in the Extended Chandra Deep
Field South | 45 pages, 15 figures, accepted for publication in the Astrophysical
Journal | Astrophys.J.667:79-91,2007 | 10.1086/520324 | null | astro-ph | null | We describe the results of an extremely deep, 0.28 deg^2 survey for z = 3.1
Ly-alpha emission-line galaxies in the Extended Chandra Deep Field South. By
using a narrow-band 5000 Anstrom filter and complementary broadband photometry
from the MUSYC survey, we identify a statistically complete sample of 162
galaxies with monochromatic fluxes brighter than 1.5 x 10^-17 ergs cm^-2 s^-1
and observers frame equivalent widths greater than 80 Angstroms. We show that
the equivalent width distribution of these objects follows an exponential with
a rest-frame scale length of w_0 = 76 +/- 10 Angstroms. In addition, we show
that in the emission line, the luminosity function of Ly-alpha galaxies has a
faint-end power-law slope of alpha = -1.49 +/- 0.4, a bright-end cutoff of log
L^* = 42.64 +/- 0.2, and a space density above our detection thresholds of 1.46
+/- 0.12 x 10^-3 h70^3 galaxies Mpc^-3. Finally, by comparing the emission-line
and continuum properties of the LAEs, we show that the star-formation rates
derived from Ly-alpha are ~3 times lower than those inferred from the
rest-frame UV continuum. We use this offset to deduce the existence of a small
amount of internal extinction within the host galaxies. This extinction,
coupled with the lack of extremely-high equivalent width emitters, argues that
these galaxies are not primordial Pop III objects, though they are young and
relatively chemically unevolved.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 19:29:22 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Gronwall",
"C.",
""
],
[
"Ciardullo",
"R.",
""
],
[
"Hickey",
"T.",
""
],
[
"Gawaiser",
"E.",
""
],
[
"Feldmeier",
"J. J.",
""
],
[
"van Dokkum",
"P. G.",
""
],
[
"Urry",
"C. M.",
""
],
[
"Herrera",
"D.",
""
],
[
"Lehmer",
"B. D.",
""
],
[
"Infante",
"L.",
""
],
[
"Orsi",
"A.",
""
],
[
"Marchesini",
"D.",
""
],
[
"Blanc",
"G. A.",
""
],
[
"Francke",
"H.",
""
],
[
"Lira",
"P.",
""
],
[
"Treister",
"E.",
""
]
] |
0705.3918 | Paul M. Terwilliger | Kazumasa Nomura and Paul Terwilliger | Transition maps between the 24 bases for a Leonard pair | 28 pages | null | null | null | math.RA math.CO | null | Let $V$ denote a vector space with finite positive dimension. We consider a
pair of linear transformations $A : V \to V$ and $A^* : V \to V$ that satisfy
(i) and (ii) below:
(i) There exists a basis for $V$ with respect to which the matrix
representing $A$ is irreducible tridiagonal and the matrix representing $A^*$
is diagonal.
(ii) There exists a basis for $V$ with respect to which the matrix
representing $A^*$ is irreducible tridiagonal and the matrix representing $A$
is diagonal.
We call such a pair a Leonard pair on $V$. In an earlier paper we described
24 special bases for $V$. One feature of these bases is that with respect to
each of them the matrices that represent $A$ and $A^*$ are (i) diagonal and
irreducible tridiagonal or (ii) irreducible tridiagonal and diagonal or (iii)
lower bidiagonal and upper bidiagonal or (iv) upper bidiagonal and lower
bidiagonal. For each ordered pair of bases among the 24, there exists a unique
linear transformation from $V$ to $V$ that sends the first basis to the second
basis; we call this the transition map. In this paper we find each transition
map explicitly as a polynomial in $A,A^*$.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 00:09:01 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Nomura",
"Kazumasa",
""
],
[
"Terwilliger",
"Paul",
""
]
] |
0705.3919 | Nikolay Ivanov | Nikolay A. Ivanov | On the Structure of Some Reduced Amalgamated Free Product C*-Algebras | 23 pages | null | null | null | math.OA math.FA | null | We study some reduced free products of C*-algebras with amalgamations. We
give sufficient conditions for the positive cone of the K_0 group to be the
largest possible. We also give sufficient conditions for simplicity and
uniqueness of trace. We use the later result to give a necessary and sufficient
condition for simplicity and uniqueness of trace of the reduced C*-algebras of
the Baumslag-Solitar groups BS(m,n).
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 00:23:17 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 02:47:37 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Sep 2007 02:55:22 GMT"
}
] | 2007-09-04T00:00:00 | [
[
"Ivanov",
"Nikolay A.",
""
]
] |
0705.3920 | Jaejeong Lee | Jaejeong Lee | A convexity theorem for real projective structures | 61 pages, 19 figures | null | null | null | math.GT | null | Given a finite collection P of convex n-polytopes in RP^n (n>1), we consider
a real projective manifold M which is obtained by gluing together the polytopes
in P along their facets in such a way that the union of any two adjacent
polytopes sharing a common facet is convex. We prove that the real projective
structure on M is (1) convex if P contains no triangular polytope, and (2)
properly convex if, in addition, P contains a polytope whose dual polytope is
thick. Triangular polytopes and polytopes with thick duals are defined as
analogues of triangles and polygons with at least five edges, respectively.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 02:23:15 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Lee",
"Jaejeong",
""
]
] |
0705.3921 | Robert Carroll | Robert Carroll | Remarks on Weyl geometry and quantum mechanics | 25 pages, Latex, typos fixed, some embellishment, reference added,
typos corrected, some reorganization and clarification | null | null | null | gr-qc | null | A short survey of some material related to conformal general relativity
(CGR), integrable Weyl geometry, and Dirac-Weyl (DW) theory is given which
suggests that CGR is essentially equivalent to DW with quantum mass equivalent
to conformal mass, and various actions can be reformulated in terms of the
quantum potential.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 00:25:14 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Jun 2007 02:16:39 GMT"
},
{
"version": "v3",
"created": "Thu, 3 Jan 2008 16:09:59 GMT"
}
] | 2008-01-03T00:00:00 | [
[
"Carroll",
"Robert",
""
]
] |
0705.3922 | Adam Burrows | Ivan Hubeny and Adam Burrows | A Systematic Study of Departures from Chemical Equilibrium in the
Atmospheres of Substellar Mass Objects | Accepted to the Astrophysical Journal; 21 figures in a total of 26
emulateapj pages | null | 10.1086/522107 | null | astro-ph | null | We present a systematic study of the spectral consequences of departures from
chemical equilibrium in the atmospheres of L and T dwarfs, and for even cooler
dwarfs. The temperature/pressure profiles of the non-equilibrium models are
fully consistent with the non-equilibrium chemistry. Our grid of
non-equilibrium models includes spectra for effective temperatures from 200 K
to 1800 K, three surface gravities, four possible values of the coefficient of
eddy diffusion in the radiative zone, and three different CO/CH$_4$ chemical
reaction prescriptions. We find that the non-equilibrium overabundance of CO
translates into flux suppressions in the M ($\sim4-$5 $\mu$m) band of at most
$\sim$40% between effective temperatures of 600 and 1800 K. The effect is
largest around $T_{\rm eff} \approx 1100$ K. The underabundance of ammonia due
to non-equilibrium chemistry translates into flux enhancements of no more than
$\sim$20% for the $T_{\rm eff}$ range from 300 to 1800 K, with the largest
effects at the lowest values of $T_{\rm eff}$. The magnitude of the departure
from chemical equilibrium increases with decreasing gravity, with increasing
eddy diffusion coefficient, and with decreasing speed of the CO/CH$_4$
reaction. Though these effects are modest, they lead to better fits with the
measured T dwarf spectra. Furthermore, the suppression in the M band due to
non-equilibrium enhancements in the CO abundance disappears below $\sim$500 K,
and is only partial above $\sim$500 K, preserving the M band flux as a useful
diagnostic of cool atmospheres and maintaining its importance for searches for
brown dwarfs cooler than T dwarfs.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 00:58:13 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 18:39:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hubeny",
"Ivan",
""
],
[
"Burrows",
"Adam",
""
]
] |
0705.3923 | Eduardo Mucciolo | Martina Hentschel, Diego C. B. Valente, Eduardo R. Mucciolo, Harold U.
Baranger | Improving Intrinsic Decoherence in Multi-Quantum-Dot Charge Qubits | 11 pages, 6 figures, submitted to Phys. Rev. B | Phys. Rev. B 76, 235309 (2007) | 10.1103/PhysRevB.76.235309 | null | cond-mat.mes-hall quant-ph | null | We discuss decoherence in charge qubits formed by multiple lateral quantum
dots in the framework of the spin-boson model and the Born-Markov
approximation. We consider the intrinsic decoherence caused by the coupling to
bulk phonon modes. Two distinct quantum dot configurations are studied: (i)
Three quantum dots in a ring geometry with one excess electron in total and
(ii) arrays of quantum dots where the computational basis states form multipole
charge configurations. For the three-dot qubit, we demonstrate the possibility
of performing one- and two-qubit operations by solely tuning gate voltages.
Compared to the proposal by DiVincenzo {\it et al.} involving a linear
three-dot spin qubit, the three-dot charge qubit allows for less overhead on
two-qubit operations. For small interdot tunnel amplitudes, the three-dot
qubits have $Q$ factors much higher than those obtained for double dot systems.
The high-multipole dot configurations also show a substantial decrease in
decoherence at low operation frequencies when compared to the double-dot qubit.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 19:43:45 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Dec 2007 15:38:29 GMT"
}
] | 2009-08-12T00:00:00 | [
[
"Hentschel",
"Martina",
""
],
[
"Valente",
"Diego C. B.",
""
],
[
"Mucciolo",
"Eduardo R.",
""
],
[
"Baranger",
"Harold U.",
""
]
] |
0705.3924 | Alexander D. Hernandez | A. D. Hern\'andez, O. Ar\'es, C. Hart, D. Dom\'inguez, H. Pastoriza,
and A. Butera | Dissipation in Mesoscopic Superconductors with Ac Magnetic Fields | 4 pages, 2 figures | Journal of Low Temperature Physics 135, 119 (2004) | 10.1023/B:JOLT.0000016970.18066.ca | null | cond-mat.supr-con cond-mat.mes-hall | null | The response of mesoscopic superconductors to an ac magnetic field is
investigated both experimentally and with numerical simulations. We study small
square samples with dimensions of the order of the penetration depth. We obtain
the ac susceptibitity $\chi=\chi'+i\chi''$ at microwave frequencies as a
function of the dc magnetic field $H_{dc}$. We find that the dissipation, given
by $\chi''$, has a non monotonous behavior in mesoscopic samples. In the
numerical simulations we obtain that the dissipation increases before the
penetration of vortices and then it decreases abruptly after vortices have
entered the sample. This is verified experimentally, where we find that
$\chi''$ has strong oscillations as a function of $H_{dc}$ in small squares of
Pb.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 19:31:20 GMT"
}
] | 2016-03-28T00:00:00 | [
[
"Hernández",
"A. D.",
""
],
[
"Arés",
"O.",
""
],
[
"Hart",
"C.",
""
],
[
"Domínguez",
"D.",
""
],
[
"Pastoriza",
"H.",
""
],
[
"Butera",
"A.",
""
]
] |
0705.3925 | Peter Forrester | Peter J. Forrester and Eric M. Rains | Symmetrized models of last passage percolation and non-intersecting
lattice paths | 21 pages, 5 figures | null | 10.1007/s10955-007-9413-y | null | math-ph math.MP | null | It has been shown that the last passage time in certain symmetrized models of
directed percolation can be written in terms of averages over random matrices
from the classical groups $U(l)$, $Sp(2l)$ and $O(l)$. We present a theory of
such results based on non-intersecting lattice paths, and integration
techniques familiar from the theory of random matrices. Detailed derivations of
probabilities relating to two further symmetrizations are also given.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 02:16:07 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Forrester",
"Peter J.",
""
],
[
"Rains",
"Eric M.",
""
]
] |
0705.3926 | Takafumi Kita | Takafumi Kita | Entropy Change through Rayleigh-B\'enard Convective Transition with
Rigid Boundaries | 5 pages, 4 figures | J. Phys. Soc. Jpn. 76, No. 6 (2007) | 10.1143/JPSJ.76.064006 | null | cond-mat.stat-mech | null | The previous investigation on Rayleigh-B\'enard convection of a dilute
classical gas [T. Kita: J. Phys. Soc. Jpn. {\bf 75} (2006) 124005] is extended
to calculate entropy change of the convective transition with the rigid
boundaries. We obtain results qualitatively similar to those of the stress-free
boundaries. Above the critical Rayleigh number, the roll convection is realized
among possible steady states with periodic structures, carrying the highest
entropy as a function of macroscopic mechanical variables.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 02:19:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kita",
"Takafumi",
""
]
] |
0705.3927 | Laurette S. Tuckerman | Katarzyna Boronska and Laurette S. Tuckerman | Standing and travelling waves in cylindrical Rayleigh-Benard convection | null | J. Fluid Mech. 559, 279-298 (2006) | 10.1017/S0022112006000309 | null | physics.flu-dyn | null | The Boussinesq equations for Rayleigh-Benard convection are simulated for a
cylindrical container with an aspect ratio near 1.5. The transition from an
axisymmetric stationary flow to time-dependent flows is studied using nonlinear
simulations, linear stability analysis and bifurcation theory. At a Rayleigh
number near 25,000, the axisymmetric flow becomes unstable to standing or
travelling azimuthal waves. The standing waves are slightly unstable to
travelling waves. This scenario is identified as a Hopf bifurcation in a system
with O(2) symmetry.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 03:41:17 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 22:13:52 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Boronska",
"Katarzyna",
""
],
[
"Tuckerman",
"Laurette S.",
""
]
] |
0705.3928 | Taejin Lee | Seungmuk Ji, Ja-Yong Koo and Taejin Lee | Dissipative Hofstadter Model at the Magic Points and Critical Boundary
Sine-Gordon Model | 6 pages, to be published in J. Koean. Physics. Soc. (2007) | J. Korean Phys. Soc.50, S54 (2007) | 10.3938/jkps.50.54 | null | hep-th cond-mat.mes-hall quant-ph | null | The dissipative Hofstadter model describes quantum particles moving in two
dimensions subject to a uniform magnetic field, a periodic potential and a
dissipative force. We discuss the dissipative Hofstadter model in the framework
of the boundary state formulation in string theory and construct exact boundary
states for the model at the magic points by using the fermion representation.
The dissipative Hofstadter model at magic points is shown to be equivalent to
the critical boundary sine-Gordon model.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 04:53:38 GMT"
}
] | 2016-01-29T00:00:00 | [
[
"Ji",
"Seungmuk",
""
],
[
"Koo",
"Ja-Yong",
""
],
[
"Lee",
"Taejin",
""
]
] |
0705.3929 | Jordan Bell | Leonhard Euler | Speculations on some characteristic properties of numbers | 9 pages | null | null | null | math.HO math.NT | null | Translation of the Latin original "Speculationes circa quasdam insignes
proprietates numerorum" (1784). E564 in the Enestrom index. In this paper Euler
talks about Farey sequences and proves some results about the phi function, the
number of positive integers less than and relatively prime to an integer. Euler
uses the notation pi instead of phi.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 04:53:42 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Euler",
"Leonhard",
""
]
] |
0705.3930 | Taejin Lee | Taejin Lee | Boundary State for Dissipative Quantum Mechanics and Thirring Model | 6 pages | null | null | null | hep-th cond-mat.mes-hall quant-ph | null | The dissipative quantum system is studied using the Thirring model with a
boundary mass. At the critical point where the Thirring coupling vanishes, the
theory reduces to a free fermion theory with a boundary mass. We construct
boundary states for the dissipative quantum systems in one dimension, which
describes the system off the critical points as well as at the critical points.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 05:00:42 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Lee",
"Taejin",
""
]
] |
0705.3931 | David Eisenbud | David Eisenbud and Bernd Ulrich | Row Ideals and Fibers of Morphisms | Many small improvements over the May 2007 version | null | null | null | math.AC math.AG | null | We study the fibers of a projective morphism and some related algebraic
problems. We characterize the analytic spread of a homogeneous ideal through
properties of its syzygy matrix. Powers of linearly presented ideals need not
be linearly presented, but we identify a weaker linearity property that is
preserved under taking powers.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 20:56:57 GMT"
},
{
"version": "v2",
"created": "Sat, 29 Mar 2008 07:10:48 GMT"
}
] | 2008-03-29T00:00:00 | [
[
"Eisenbud",
"David",
""
],
[
"Ulrich",
"Bernd",
""
]
] |
0705.3932 | Michael Zieve | Michael E. Zieve | p^k-torsion of genus two curves over F_{p^m} | 7 pages; the proofs sketched in the previous version are now given in
detail | Math. Comp. 79 (2010) 1833-1838 | null | null | math.AG math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the isogeny classes of abelian surfaces over F_q whose group of
F_q-rational points has order divisible by q^2. We also solve the same problem
for Jacobians of genus-2 curves.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 06:01:26 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 04:06:32 GMT"
},
{
"version": "v3",
"created": "Fri, 29 Aug 2008 18:52:56 GMT"
}
] | 2013-10-08T00:00:00 | [
[
"Zieve",
"Michael E.",
""
]
] |
0705.3933 | Subenoy Chakraborty | Asit Banerjee, Tanwi Bandyopadhyay and Subenoy Chakraborty | Emergent Universe in Brane World Scenario | 4 pages, no figure | Grav.Cosmol.13:290-292,2007 | null | null | gr-qc | null | A model of an emergent universe is obtained in brane world. Here the bulk
energy is in the form of cosmological constant, while the brane consists of the
Chaplygin gas with the modified equation of state such as $p=A\rho-B/\rho$.
Initially the brane matter for the special choice $A=1/3$ may have negative or
positive pressure depending on the relative magnitudes of the parameter $B$ and
the cosmological constant of the bulk, while asymptotically in future the brane
world approaches a $\Lambda$CDM model.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 06:36:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Banerjee",
"Asit",
""
],
[
"Bandyopadhyay",
"Tanwi",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] |
0705.3934 | Izu Vaisman | Izu Vaisman | Generalized CRF-structures | Appendix on generalized Sasakian structures added | null | null | null | math.DG | null | A generalized F-structure is a complex, isotropic subbundle $E$ of
$T_cM\oplus T^*_cM$ ($T_cM=TM\otimes_{\mathds{R}}\mathds{C}$ and the metric is
defined by pairing) such that $E\cap\bar E^{\perp}=0$. If $E$ is also closed by
the Courant bracket, $E$ is a generalized CRF-structure. We show that a
generalized F-structure is equivalent with a skew-symmetric endomorphism $\Phi$
of $TM\oplus T^*M$ that satisfies the condition $\Phi^3+\Phi=0$ and we express
the CRF-condition by means of the Courant-Nijenhuis torsion of $\Phi$. The
structures that we consider are generalizations of the F-structures defined by
Yano and of the CR (Cauchy-Riemann) structures. We construct generalized
CRF-structures from: a classical F-structure, a pair $(\mathcal{V},\sigma)$
where $\mathcal{V}$ is an integrable subbundle of $TM$ and $\sigma$ is a 2-form
on $M$, a generalized, normal, almost contact structure of codimension $h$. We
show that a generalized complex structure on a manifold $\tilde M$ induces
generalized CRF-structures into some submanifolds $M\subseteq\tilde M$.
Finally, we consider compatible, generalized, Riemannian metrics and we define
generalized CRFK-structures that extend the generalized K\"ahler structures and
are equivalent with quadruples $(\gamma,F_+,F_-,\psi)$, where $(\gamma,F_\pm)$
are classical, metric CRF-structures, $\psi$ is a 2-form and some conditions
expressible in terms of the exterior differential $d\psi$ and the
$\gamma$-Levi-Civita covariant derivative $\nabla F_\pm$ hold. If $d\psi=0$,
the conditions reduce to the existence of two partially K\"ahler reductions of
the metric $\gamma$. The paper ends by an Appendix where we define and
characterize generalized Sasakian structures.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 07:20:58 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 13:40:46 GMT"
}
] | 2007-09-06T00:00:00 | [
[
"Vaisman",
"Izu",
""
]
] |
0705.3935 | You-Quan Li | Li-Hua Lu and You-Quan Li | Conversion of $^{40}$K-$^{87}$Rb mixtures into stable molecules | Revtex, 5 pages, 3 figures; version to appear in PRA (some content
changed) | Phys. Rev. A 76, 053608 (2007) | 10.1103/PhysRevA.76.053608 | null | cond-mat.soft cond-mat.other | null | We study the conversion of $^{40}$K and $^{87}$Rb atoms into stable molecules
through the stimulated Raman adiabatic passage (STIRAP) in photoassociation
assisted with Feshbach resonance. Starting with the mean-field Langrange
density, we show that the atom-to-molecule conversion efficiency by STIRAP
aided by Feshbach resonance is much larger than that by bare Feshbach
resonance. We also study the influence of the population imbalance on the
atom-to-molecule conversion.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 07:28:36 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 09:05:29 GMT"
}
] | 2007-11-24T00:00:00 | [
[
"Lu",
"Li-Hua",
""
],
[
"Li",
"You-Quan",
""
]
] |
0705.3936 | Shigehiro Yasui | A. Arai, M. Oka and S. Yasui | \Lambda^{\ast}-hypernuclei in phenomenological nuclear forces | null | Prog.Theor.Phys.119:103-115,2008 | 10.1143/PTP.119.103 | null | nucl-th | null | The $\Lambda^{\ast}$-hypernuclei, which are bound states of $\Lambda(1405)$
and nuclei, are discussed as a possible interpretation of the $\bar{K}$-nuclei.
The Bonn and Nijmegen potentials are extended and used as a phenomenological
potential between $\Lambda^{\ast}$ and $N$. The $K$-exchange potential is also
considered in the $\Lambda^{\ast}$ and $N$ interaction. The two-body
($\Lambda^{\ast}N$) and three-body ($\Lambda^{\ast}NN$) systems are solved by a
variational method. It is shown that the spin and isospin of the ground states
are assigned as $\Lambda^{\ast}N(S=1, I=1/2)$ and $\Lambda^{\ast}NN(S=3/2,
I=0)$, respectively. The binding energies of the $\Lambda^{\ast}$-hypernuclei
are discussed in comparison with experiment.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 08:05:24 GMT"
},
{
"version": "v2",
"created": "Sun, 11 Nov 2007 11:10:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Arai",
"A.",
""
],
[
"Oka",
"M.",
""
],
[
"Yasui",
"S.",
""
]
] |
0705.3937 | Aristides Kontogeorgis | Dimoklis Goundaroulis, Aristides Kontogeorgis | On the principal ideal theorem in arithmetic topology | 5 pages | null | null | null | math.GT math.NT | null | In this paper we state and prove the analogous of the principal ideal theorem
of algebraic number theory for the case of 3-manifolds from the point of view
of arithmetic topology.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 08:11:44 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Goundaroulis",
"Dimoklis",
""
],
[
"Kontogeorgis",
"Aristides",
""
]
] |
0705.3938 | Naoya Enomoto | Naoya Enomoto and Masaki Kashiwara | Symmetric Crystals and LLTA Type Conjectures for the Affine Hecke
Algebras of Type B | 20pages | null | null | null | math.RT math.QA | null | In the previous paper "Symmetric Crystals and Affine Hecke Algebras of Type
B", we formulated a conjecture on the relations between certain classes of
irreducible representations of affine Hecke algebras of type B and symmetric
crystals for $\gl_\infty$. In the first half of this paper (sections 2 and 3),
we give a survey of the LLTA type theorem of the affine Hecke algebra of type
$A$. In the latter half (sections 4, 5 and 6), we review the construction of
the symmetric crystals and the LLTA type conjectures for the affine Hecke
algebra of type $B$.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 08:33:42 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Enomoto",
"Naoya",
""
],
[
"Kashiwara",
"Masaki",
""
]
] |
0705.3939 | Rishikesh Vaidya | Chan-Chi Chiou, Otto C. W. Kong and Rishikesh D. Vaidya | Quark Loop Contributions to Neutron, Deuteron, and Mercury EDMs from
Supersymmetry without R parity | 16 pages, 10 figures, accepted for publication in Physical Review D | Phys.Rev.D76:013003,2007 | 10.1103/PhysRevD.76.013003 | NCU-HEP-k026 | hep-ph | null | We present a detailed analysis of the neutron, deuteron and mercury electric
dipole moment from supersymmetry without R parity, focusing on the quark-scalar
loop contributions. Being proportional to top Yukawa and top mass, such
contributions are often large. Analytical expressions illustrating the explicit
role of the R-parity violating parameters are given following perturbative
diagonalization of mass-squared matrices for the scalars. Dominant
contributions come from the combinations $B_i \lambda^{\prime}_{ij1}$ for which
we obtain robust bounds. It turns out that neutron and deuteron EDMs receive
much stronger contributions than mercury EDM and any null result at the future
deuteron EDM experiment or Los Alamos neutron EDM experiment can lead to
extra-ordinary constraints on RPV parameter space. Even if R-parity violating
couplings are real, CKM phase does induce RPV contribution and for some cases
such a contribution is as strong as contribution from phases in the R-parity
violating couplings.Hence, we have bounds directly on $|B_i
\lambda^{\prime}_{ij1}|$ even if the RPV parameters are all real.
Interestingly, even if slepton mass and/or $\mu_0$ is as high as 1 TeV, it
still leads to neutron EDM that is an order of magnitude larger than the
sensitivity at Los Alamos experiment. Since the results are not much sensitive
to $\tan \beta$, our constraints will survive even if other observables tighten
the constraints on $\tan \beta$.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 09:07:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chiou",
"Chan-Chi",
""
],
[
"Kong",
"Otto C. W.",
""
],
[
"Vaidya",
"Rishikesh D.",
""
]
] |
0705.3940 | Tomonori Hioki | Tomonori Hioki, Yoichi Itoh, Yumiko Oasa, Misato Fukagawa, Tomoyuki
Kudo, Satoshi Mayama, Hitoshi Funayama, Masahiko Hayashi, Saeko S. Hayashi,
Tae-Soo Pyo, Miki Ishii, Takayuki Nishikawa, Motohide Tamura | Near-Infrared Coronagraphic Observations of the T Tauri Binary System UY
Aur | 16 pages, 6 figures; accepted for publication in AJ | Astron.J.134:880-885,2007 | 10.1086/519737 | null | astro-ph | null | We present a near-infrared image of UY Aur, a 0.9" separated binary system,
using the Coronagraphic Imager with Adaptive Optics on the Subaru Telescope.
Thanks to adaptive optics, the spatial resolution of our image was ~0.1" in the
full width at half maximum of the point spread function, the highest achieved.
By comparison with previous measurements, we estimated that the orbital period
is ~1640 yrs and the total mass of the binary is ~1.73 solar mass. The observed
H-band magnitude of the secondary varies by as much as 1.3 mag within a decade,
while that of the primary is rather stable. This inconstancy may arise from
photospheric variability caused by an uneven accretion rate or from the
rotation of the secondary. We detected a half-ring shaped circumbinary disk
around the binary with a bright southwest part but a barely detectable
northeast portion. The brightness ratio is ~57. Its inner radius and
inclination are about 520 AU and 42, respectively. The disk is not uniform but
has remarkable features, including a clumpy structure along the disk,
circumstellar material inside the inner cavity, and an extended armlike
structure. The circumstellar material inside the cavity probably corresponds to
a clump or material accreting from the disk onto the binary. The armlike
structure is a part of the disk, created by the accretion from the outer region
of the disk or encounters with other stellar systems.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 09:44:32 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hioki",
"Tomonori",
""
],
[
"Itoh",
"Yoichi",
""
],
[
"Oasa",
"Yumiko",
""
],
[
"Fukagawa",
"Misato",
""
],
[
"Kudo",
"Tomoyuki",
""
],
[
"Mayama",
"Satoshi",
""
],
[
"Funayama",
"Hitoshi",
""
],
[
"Hayashi",
"Masahiko",
""
],
[
"Hayashi",
"Saeko S.",
""
],
[
"Pyo",
"Tae-Soo",
""
],
[
"Ishii",
"Miki",
""
],
[
"Nishikawa",
"Takayuki",
""
],
[
"Tamura",
"Motohide",
""
]
] |
0705.3941 | Kirill Shtengel | F. Pollmann, P. Fulde and K. Shtengel | Kinetic ferromagnetism on a kagome lattice | 4 pages, 2 color eps figures; updated version published in Phys. Rev.
Lett.; one reference added | Phys. Rev. Lett. 100, 136404 (2008) | 10.1103/PhysRevLett.100.136404 | null | cond-mat.str-el | null | We study strongly correlated electrons on a kagome lattice at 1/6 and 1/3
filling. They are described by an extended Hubbard Hamiltonian. We are
concerned with the limit |t|<<V<<U with hopping amplitude t, nearest-neighbor
repulsion V and on-site repulsion U. We derive an effective Hamiltonian and
show, with the help of the Perron-Frobenius theorem, that the system is
ferromagnetic at low temperatures. The robustness of ferromagnetism is
discussed and extensions to other lattices are indicated.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 10:09:25 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 01:05:43 GMT"
}
] | 2008-06-18T00:00:00 | [
[
"Pollmann",
"F.",
""
],
[
"Fulde",
"P.",
""
],
[
"Shtengel",
"K.",
""
]
] |
0705.3942 | Fardin Kheirandish | M. Amooshahi and F. Kheirandish | Electromagnetic field quantization in an anisotropic and inhomogeneous
magnetodielectric | 19 pages | J. Phys. A : Math. Theo. 41 (2008) 275402 | 10.1142/S0217732308026455 | null | quant-ph | null | The electromagnetic field in an anisotropic and inhomogeneous
magnetodielectric is quantized by modelling the medium with two independent
quantum fields. Some coupling tensors coupling the electromagnetic field with
the medium are introduced. Electric and magnetic polarizations are obtained in
terms of the ladder operators of the medium and the coupling tensors
explicitly. Using a minimal coupling scheme for electric and magnetic
interactions, the Maxwell equations and the constitutive equations of the
medium are obtained. The electric and magnetic susceptibility tensors of the
medium are calculated in terms of the coupling tensors. Finally the efficiency
of the approach is elucidated by some examples.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 09:48:45 GMT"
}
] | 2012-07-12T00:00:00 | [
[
"Amooshahi",
"M.",
""
],
[
"Kheirandish",
"F.",
""
]
] |
0705.3943 | Zoe Leinhardt | Zoe M. Leinhardt, Sarah T. Stewart, Peter H. Schultz | Physical effects of collisions in the Kuiper belt | To appear in The Solar System Beyond Neptune, published by Arizona
Press | null | null | null | astro-ph | null | Collisions are a major modification process over the history of the Kuiper
Belt. Recent work illuminates the complex array of possible outcomes of
individual collisions onto porous, volatile bodies. The cumulative effects of
such collisions on the surface features, composition, and internal structure of
Kuiper Belt Objects are not yet known. In this chapter, we present the current
state of knowledge of the physics of cratering and disruptive collisions in KBO
analog materials. We summarize the evidence for a rich collisional history in
the Kuiper Belt and present the range possible physical modifications on
individual objects. The question of how well present day bodies represent
primordial planetesimals can be addressed through future studies of the coupled
physical and collisional evolution of Kuiper Belt Objects.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 10:09:51 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Leinhardt",
"Zoe M.",
""
],
[
"Stewart",
"Sarah T.",
""
],
[
"Schultz",
"Peter H.",
""
]
] |
0705.3944 | Mihail Chizhov | Mihail V. Chizhov | Heavy chiral bosons search at hadron colliders | 14 pages, 7 figures + 1 additional page with figures | null | null | null | hep-ph hep-ex | null | The production of new spin-1 chiral bosons at the hadron colliders, the
Fermilab Tevatron and the CERN LHC, is considered. The masses of the chiral
bosons can be determined on the basis of experimental data of precise
low-energy experiments, which already indicate indirectly their existence. They
can explain, for example, the serious 4.5 sigma discrepancy between the
measured and the predicted two pion branching ratio of the tau decay and the
sign of the 3.3 sigma deviation of the muon (g-2) theoretical prediction from
the experimental value. Quantitative evaluations of the various differential
cross-sections of the chiral boson production at hadron colliders are made
using the CalcHEP package. It is noteworthy that the Tevatron data already hint
the existence of the lightest charged chiral boson with a mass around 500 GeV.
New Tevatron data and the LHC results will definitely confirm or reject this
indication. In the positive case the LHC would be able to discover all
predicted charged and neutral chiral bosons spanning in mass up to 1 TeV.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 10:22:21 GMT"
}
] | 2007-09-19T00:00:00 | [
[
"Chizhov",
"Mihail V.",
""
]
] |
0705.3945 | Flera Kopylova Dr. | Flera G. Kopylova, Alexander I. Kopylov (Special Astrophysical
Observatory of Russian Academy of Sciences) | Peculiar Motions in the Region of the Ursa Major Supercluster of
Galaxies | 21 pages, 4 tables, 7 figures | Astron.Lett.33:211-221,2007; Pisma Astron.Zh.33:243-254,2007 | 10.1134/S1063773707040019 | null | astro-ph | null | We have investigated the peculiar motions of clusters of galaxies in the Ursa
Major (UMa) supercluster and its neighborhood. Based on SDSS (Sloan Digital Sky
Survey) data, we have compiled a sample of early-type galaxies and used their
fundamental plane to determine the cluster distances and peculiar velocities.
The samples of early-type galaxies in the central regions (within R_200) of 12
UMa clusters of galaxies, in three main subsystems of the supercluster -- the
filamentary structures connecting the clusters, and in nine clusters from the
nearest UMa neighborhood have similar parameters. The fairly high overdensity
(3 by the galaxy number and 15 by the cluster number) suggests that the
supercluster as a whole is gravitationally bound, while no significant peculiar
motions have been found: the peculiar velocities do not exceed the measurement
errors by more than a factor of 1.5-2. The mean random peculiar velocities of
clusters and the systematic deviations from the overall Hubble expansion in the
supercluster are consistent with theoretical estimates. For the possible
approach of the three UMa subsystems to be confirmed, the measurement accuracy
must be increased by a factor of 2-3.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 10:30:43 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Kopylova",
"Flera G.",
"",
"Special Astrophysical\n Observatory of Russian Academy of Sciences"
],
[
"Kopylov",
"Alexander I.",
"",
"Special Astrophysical\n Observatory of Russian Academy of Sciences"
]
] |
0705.3946 | Shao-Long Chen | Shao-Long Chen and Xiao-Gang He | Interactions of Unparticles with Standard Model Particles | more discussion added; to be published in Phys. Rev. D (Rapid
Communications) | Phys.Rev.D76:091702,2007 | 10.1103/PhysRevD.76.091702 | null | hep-ph hep-th | null | We study interactions of unparticles ${\cal {U}}$ of dimension $d_{\cal {U}}$
due to Georgi with Standard Model (SM) fields through effective operators. The
unparticles describe the low energy physics of a non-trivial scale invariant
sector. Since unparticles come from beyond the SM physics, it is plausible that
they transform as a singlet under the SM gauge group. This helps tremendously
in limiting possible interactions. We analyze interactions of scalar ${\cal
{U}}$, vector ${\cal {U}}$$^\mu$ and spinor ${\cal {U}}$$^s$ unparticles with
SM fields and derivatives up to dimension four. Using these operators, we
discuss different features of producing unparticles at $e^+ e^-$ collider and
other phenomenologies. It is possible to distinguish different unparticles
produced at $e^+e^-$ collider by looking at various distributions of production
cross sections.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 12:02:27 GMT"
},
{
"version": "v2",
"created": "Sun, 3 Jun 2007 06:49:57 GMT"
},
{
"version": "v3",
"created": "Thu, 14 Jun 2007 08:10:20 GMT"
},
{
"version": "v4",
"created": "Fri, 14 Sep 2007 06:42:54 GMT"
}
] | 2010-04-06T00:00:00 | [
[
"Chen",
"Shao-Long",
""
],
[
"He",
"Xiao-Gang",
""
]
] |
0705.3947 | Hilmar Forkel | Hilmar Forkel | Gauge-invariant soft modes in Yang-Mills theory | 4 pages | Int.J.Mod.Phys.E16:2789-2793,2007 | 10.1142/S0218301307008410 | null | hep-th | null | A gauge-invariant saddle point expansion for the Yang-Mills vacuum transition
amplitude on the basis of the squeezed approximation to the vacuum wave
functional is outlined. This framework allows the identification of
gauge-invariant infrared degrees of freedom which arise as dominant sets of
gauge field orbits and provide the principal input for an essentially
analytical treatment of soft amplitudes. The analysis of the soft modes sheds
new light on how vacuum fields organize themselves into collective excitations
and yields a gauge-invariant representation of instanton and meron effects as
well as a new physical interpretation for Faddeev-Niemi knots.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 12:11:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Forkel",
"Hilmar",
""
]
] |
0705.3948 | Dag Madsen | Bernt Tore Jensen, Dag Madsen, Xiuping Su | Degeneration of A-infinity modules | 18 pages | null | null | null | math.RT | null | In this paper we use A-infinity modules to study the derived category of a
finite dimensional algebra over an algebraically closed field. We study
varieties parameterising A-infinity modules. These varieties carry an action of
an algebraic group such that orbits correspond to quasi-isomorphism classes of
complexes in the derived category. We describe orbit closures in these
varieties, generalising a result of Zwara and Riedtmann for modules.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 12:30:31 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Jensen",
"Bernt Tore",
""
],
[
"Madsen",
"Dag",
""
],
[
"Su",
"Xiuping",
""
]
] |
0705.3949 | Yeb Havinga | Yeb Havinga | Translating a first-order modal language to relational algebra | null | null | null | null | cs.LO cs.DB | null | This paper is about Kripke structures that are inside a relational database
and queried with a modal language. At first the modal language that is used is
introduced, followed by a definition of the database and relational algebra.
Based on these definitions two things are presented: a mapping from components
of the modal structure to a relational database schema and instance, and a
translation from queries in the modal language to relational algebra queries.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 12:36:58 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Havinga",
"Yeb",
""
]
] |
0705.3950 | Bingsong Zou | J.J.Xie, B.S.Zou, H.C.Chiang | The role of $N^*(1535)$ in $pp \to pp \phi$ and $\pi^- p \to n \phi$
reactions | 15 pages, 6 figures | Phys.Rev.C77:015206,2008 | 10.1103/PhysRevC.77.015206 | null | nucl-th | null | The near threshold $\phi$ meson production in proton-proton and $\pi^- p$
collisions is studied with the assumption that the production mechanism is due
to the sub-$N\phi$-threshold $N^*(1535)$ resonance. The $\pi^0$, $\eta$ and
$\rho^0$-meson exchanges for proton-proton collisions are considered. It is
shown that the contribution to the $pp \to pp \phi$ reaction from the t-channel
$\pi^0$ meson exchange is dominant. With a significant $N^*(1535)N\phi$
coupling ($g^2_{N^*(1535)N \phi}/4 \pi$ = 0.13), both $pp \to pp \phi$ and
$\pi^- p \to n \phi$ data are very well reproduced. The significant coupling of
the $N^*(1535)$ resonance to $N \phi$ is compatible with previous indications
of a large $s \bar{s}$ component in the quark wave function of the $N^*(1535)$
resonance and may be the real origin of the significant enhancement of the
$\phi$ production over the naive OZI-rule predictions.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 13:25:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Xie",
"J. J.",
""
],
[
"Zou",
"B. S.",
""
],
[
"Chiang",
"H. C.",
""
]
] |
0705.3951 | Claudio Ciofi degli Atti | C. Ciofi degli Atti, L.P. Kaptari | A non factorized calculation of the process ^3He(e,e'p)^2H at medium
energies | 14 pages, 6 figures | Phys.Rev.Lett.100:122301,2008 | 10.1103/PhysRevLett.100.122301 | null | nucl-th hep-ph | null | The exclusive process ^3He(e,e^\prime p)^2H has been analyzed using realistic
few-body wave functions corresponding to the AV18 interaction and treating the
final state interaction (FSI) within the Eikonal Approximation to describe the
multiple rescattering of the struck nucleon with the nucleons of the spectator
two-nucleon system. Calculations have been performed in momentum space so that
the nucleon electromagnetic current could be left in the fully covariant form
avoiding by this way non relativistic reductions and the factorization
approximation. The results of calculations, which are compared with recent JLab
experimental data, show that the left-right asymmetry exhibit a clear
dependence upon the multiple scattering in the final state and demonstrate the
breaking down of the factorization approximation at \phi=0 i.e. for "negative"
and large \geq 300MeV/c values of the missing momentum.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 13:03:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Atti",
"C. Ciofi degli",
""
],
[
"Kaptari",
"L. P.",
""
]
] |
0705.3952 | DaeKil Park | Eylee Jung, Mi-Ra Hwang, You Hwan Ju, D. K. Park, Hungsoo Kim, Min-Soo
Kim, Jin-Woo Son | Amplitude Damping for single-qubit System with single-qubit mixed-state
Environment | 13 pages, 2 figures incluided V2: homepage address is included in
reference V3: version to appear in J. Phys. A: Mathematical and Theoretical | J. Phys. A: Math. and Theor. 41 (2008) 045306 | 10.1088/1751-8113/41/4/045306 | null | quant-ph | null | We study a generalized amplitude damping channel when environment is
initially in the single-qubit mixed state. Representing the affine
transformation of the generalized amplitude damping by a three-dimensional
volume, we plot explicitly the volume occupied by the channels simulatable by a
single-qubit mixed-state environment. As expected, this volume is embedded in
the total volume by the channels which is simulated by two-qubit enviroment.
The volume ratio is approximately 0.08 which is much smaller than 3/8, the
volume ratio for generalized depolarizing channels.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 13:28:14 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 13:51:07 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Dec 2007 08:26:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jung",
"Eylee",
""
],
[
"Hwang",
"Mi-Ra",
""
],
[
"Ju",
"You Hwan",
""
],
[
"Park",
"D. K.",
""
],
[
"Kim",
"Hungsoo",
""
],
[
"Kim",
"Min-Soo",
""
],
[
"Son",
"Jin-Woo",
""
]
] |
0705.3953 | Peter Albers | Peter Albers, Helmut Hofer | On the Weinstein conjecture in higher dimensions | 5 pages | Commentarii Mathematici Helvetici, Volume 84, Issue 2, 2009, pp.
429-436 | 10.4171/CMH/167 | null | math.SG math.GT | null | The existence of a "Plastikstufe" for a contact structure implies the
Weinstein conjecture for all supporting contact forms.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 13:58:13 GMT"
}
] | 2010-03-03T00:00:00 | [
[
"Albers",
"Peter",
""
],
[
"Hofer",
"Helmut",
""
]
] |
0705.3954 | Stefan Alin | Alin Stefan | The Cones associated to some Transversal Polymatroids | 17 pages | null | null | null | math.AC | null | In this paper we describe the facets cone associated to transversal
polymatroid presented by $\mathcal{A} =
\{\{1,2\},\{2,3\},...,\{n-1,n\},\{n,1\}\}.$ Using the Danilov-Stanley theorem
to characterize the canonicale module, we deduce that the base ring associated
to this polymatroid is Gorenstein ring. Also, starting from this polymatroid we
describe the transversal polymatroids with Gorenstein base ring in dimension 3
and with the help $\it Normaliz$ in dimension 4.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 14:08:14 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Stefan",
"Alin",
""
]
] |
0705.3955 | Hamze Nakhaee Motlagh | Hamze Nakhaee Motlagh, H. Moradi | The transition temperature of Ising ferromagnetic thin film with
aniaxial anisotropy | 5 pages, 4 figures | null | null | null | cond-mat.other | null | The magnetic properties in the Ising ferromagnetic thin films are studied. By
transfer matrix method, the transition temperatures are calculated as a
function of the intra- and interlayer exchange interactions. The transition
temperatures in the Ising ferromagnetic thin films with uniaxial anisotropy are
also studied. The results show that the transition temperature changes with the
film thickness.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 14:29:35 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jul 2007 21:44:02 GMT"
},
{
"version": "v3",
"created": "Mon, 20 Aug 2007 18:25:25 GMT"
}
] | 2007-08-20T00:00:00 | [
[
"Motlagh",
"Hamze Nakhaee",
""
],
[
"Moradi",
"H.",
""
]
] |
0705.3956 | Fabrice Gerbier | Fabrice Gerbier (LKB - Lhomond) | Boson Mott insulators at finite temperatures | null | Physical Review Letters 99 (2007) 120405 | 10.1103/PhysRevLett.99.120405 | null | cond-mat.other | null | We discuss the finite temperature properties of ultracold bosons in optical
lattices in the presence of an additional, smoothly varying potential, as in
current experiments. Three regimes emerge in the phase diagram: a
low-temperature Mott regime similar to the zero-temperature quantum phase, an
intermediate regime where MI features persist, but where superfluidity is
absent, and a thermal regime where features of the Mott insulator state have
disappeared. We obtain the thermodynamic functions of the Mott phase in the
latter cases. The results are used to estimate the temperatures achieved by
adiabatic loading in current experiments. We point out the crucial role of the
trapping potential in determining the final temperature, and suggest a scheme
for further cooling by adiabatic decompression.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 14:32:28 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 11:24:05 GMT"
}
] | 2007-09-20T00:00:00 | [
[
"Gerbier",
"Fabrice",
"",
"LKB - Lhomond"
]
] |
0705.3957 | John Gibson | John F. Gibson, Jonathan Halcrow, Predrag Cvitanovi\'c | Visualizing the geometry of state space in plane Couette flow | 32 pages, 13 figures submitted to Journal of Fluid Mechanics | null | 10.1017/S002211200800267X | null | physics.flu-dyn math.DS | null | Motivated by recent experimental and numerical studies of coherent structures
in wall-bounded shear flows, we initiate a systematic exploration of the
hierarchy of unstable invariant solutions of the Navier-Stokes equations. We
construct a dynamical, 10^5-dimensional state-space representation of plane
Couette flow at Re = 400 in a small, periodic cell and offer a new method of
visualizing invariant manifolds embedded in such high dimensions. We compute a
new equilibrium solution of plane Couette flow and the leading eigenvalues and
eigenfunctions of known equilibria at this Reynolds number and cell size. What
emerges from global continuations of their unstable manifolds is a surprisingly
elegant dynamical-systems visualization of moderate-Reynolds turbulence. The
invariant manifolds tessellate the region of state space explored by
transiently turbulent dynamics with a rigid web of continuous and discrete
symmetry-induced heteroclinic connections.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 17:13:29 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 19:57:31 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Aug 2007 23:11:27 GMT"
},
{
"version": "v4",
"created": "Fri, 10 Aug 2007 19:21:18 GMT"
},
{
"version": "v5",
"created": "Mon, 11 Feb 2008 17:37:49 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Gibson",
"John F.",
""
],
[
"Halcrow",
"Jonathan",
""
],
[
"Cvitanović",
"Predrag",
""
]
] |
0705.3958 | Zhuo Li | Zhuo Li, Xiang-Yu Wang, Eli Waxman and Peter Meszaros | Photon Acceleration at Shock Breakout of Trans-Relativistic Supernova | 5 pages, 2 figs, talk at Amsterdam 2007 GRB meeting. No figs in the
version for the proceedings "070228: The Next Decade of Gamma-Ray Burst
Afterglows", eds. Wijers, R.A.M.J., Kaper, L, and van Eerten, H.J., Elsevier
(Amsterdam) | null | null | null | astro-ph | null | The predicted thermal flash from SN shock breakout might have been detected
for the first time by Swift in GRB 060218/SN 2006aj. The detected thermal X-ray
emission in this event implies emergence of a trans-relativistic (TR) SN shock
with kinetic energy of E_k>1E49 erg. During TRSN shock breakout, the thermal
photons could be "accelerated" by the shock through repeated bulk Compton
scattering, forming a nonthermal gamma/X-ray component with dominant energy
over thermal one. This mechanism of "photon acceleration" at TRSN shock
breakout might also account for gamma-rays in the other similar low-luminosity
GRBs, implying that they are atypical GRBs with only TR outflows. TRSNe form a
peculiar type of SNe with large kinetic energy, >1E49 erg, in TR ejecta,
\Gamma\beta ~2.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 11:24:03 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Li",
"Zhuo",
""
],
[
"Wang",
"Xiang-Yu",
""
],
[
"Waxman",
"Eli",
""
],
[
"Meszaros",
"Peter",
""
]
] |
0705.3959 | Alain Pham Ngoc Dinh | Long Nguyen Thanh, Alain Pham Ngoc Dinh (MAPMO), Le Xuan Truong | Existence and Decay of Solutions of a Nonlinear Viscoelastic Problem
with a Mixed Nonhomogeneous Condition | 26 pages | Numerical Functional Analysis and Optimization / Numerical
Functional Analysis and Optimization An International Journal 29, 11-12
(2008) 1363-1393 | null | null | math.AP | null | We study the initial-boundary value problem for a nonlinear wave equation
given by u_{tt}-u_{xx}+\int_{0}^{t}k(t-s)u_{xx}(s)ds+ u_{t}^{q-2}u_{t}=f(x,t,u)
, 0 < x < 1, 0 < t < T, u_{x}(0,t)=u(0,t), u_{x}(1,t)+\eta u(1,t)=g(t),
u(x,0)=\^u_{0}(x), u_{t}(x,0)={\^u}_{1}(x), where \eta \geq 0, q\geq 2 are
given constants {\^u}_{0}, {\^u}_{1}, g, k, f are given functions. In part I
under a certain local Lipschitzian condition on f, a global existence and
uniqueness theorem is proved. The proof is based on the paper [10] associated
to a contraction mapping theorem and standard arguments of density. In Part} 2,
under more restrictive conditions it is proved that the solution u(t) and its
derivative u_{x}(t) decay exponentially to 0 as t tends to infinity.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 15:35:13 GMT"
}
] | 2009-11-11T00:00:00 | [
[
"Thanh",
"Long Nguyen",
"",
"MAPMO"
],
[
"Dinh",
"Alain Pham Ngoc",
"",
"MAPMO"
],
[
"Truong",
"Le Xuan",
""
]
] |
0705.3960 | Oliver Zimmer | O. Zimmer, K. Baumann, M. Fertl, B. Franke, S. Mironov, C. Plonka, D.
Rich, P. Schmidt-Wellenburg, H.-F. Wirth, B. van den Brandt | A superfluid helium converter for accumulation and extraction of
ultracold neutrons | null | Phys.Rev.Lett.99:104801,2007 | 10.1103/PhysRevLett.99.071302 | null | nucl-ex | null | We report the first successful extraction of accumulated ultracold neutrons
(UCN) from a converter of superfluid helium, in which they were produced by
downscattering neutrons of a cold beam from the Munich research reactor.
Windowless UCN extraction is performed in vertical direction through a
mechanical cold valve. This prototype of a versatile UCN source is comprised of
a novel cryostat designed to keep the source portable and to allow for rapid
cooldown. We measured time constants for UCN storage and extraction into a
detector at room temperature, with the converter held at various temperatures
between 0.7 and 1.3 K. The UCN production rate inferred from the count rate of
extracted UCN is close to the theoretical expectation.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 17:03:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zimmer",
"O.",
""
],
[
"Baumann",
"K.",
""
],
[
"Fertl",
"M.",
""
],
[
"Franke",
"B.",
""
],
[
"Mironov",
"S.",
""
],
[
"Plonka",
"C.",
""
],
[
"Rich",
"D.",
""
],
[
"Schmidt-Wellenburg",
"P.",
""
],
[
"Wirth",
"H. -F.",
""
],
[
"Brandt",
"B. van den",
""
]
] |
0705.3961 | Wei Zhang | Wei Zhang | New Examples of Biharmonic Submanifolds in $CP^n$ and $S^{2n+1}$ | 10 pages | null | null | null | math.DG | null | We construct biharmonic real hypersurfaces and Lagrangian submanifolds of
Clifford torus type in $CP^n$ via the Hopf fibration; and get new examples of
biharmonic submanifolds in $S^{2n+1}$ as byproducts .
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 15:49:42 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Zhang",
"Wei",
""
]
] |
0705.3962 | Christian Schoenenberger | M. R. Graeber, M. Weiss, D. Keller, S. Oberholzer, C. Schoenenberger | Mapping electron delocalization by charge transport spectroscopy in an
artificial molecule | null | null | 10.1002/andp.200710256 | null | cond-mat.mes-hall | null | In this letter we present an experimental realization of the quantum
mechanics textbook example of two interacting electronic quantum states that
hybridize forming a molecular state. In our particular realization, the quantum
states themselves are fabricated as quantum dots in a molecule, a carbon
nanotube.
For sufficient quantum-mechanical interaction (tunnel coupling) between the
two quantum states, the molecular wavefunction is a superposition of the two
isolated (dot) wavefunctions. As a result, the electron becomes delocalized and
a covalent bond forms.
In this work, we show that electrical transport can be used as a sensitive
probe to measure the relative weight of the two components in the superposition
state as a function of the gate-voltages.
For the field of carbon nanotube double quantum dots, the findings represent
an additional step towards the engineering of quantum states.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 16:02:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Graeber",
"M. R.",
""
],
[
"Weiss",
"M.",
""
],
[
"Keller",
"D.",
""
],
[
"Oberholzer",
"S.",
""
],
[
"Schoenenberger",
"C.",
""
]
] |
0705.3963 | S Brendle | S. Brendle and R.M. Schoen | Classification of manifolds with weakly 1/4-pinched curvatures | Final version | Acta Math. 200, 1--13 (2008) | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a compact Riemannian manifold with weakly 1/4-pinched sectional
curvatures is either locally symmetric or diffeomorphic to a space form.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 16:06:40 GMT"
},
{
"version": "v2",
"created": "Sun, 25 Nov 2007 23:08:22 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Jul 2008 12:01:09 GMT"
}
] | 2008-07-18T00:00:00 | [
[
"Brendle",
"S.",
""
],
[
"Schoen",
"R. M.",
""
]
] |
0705.3964 | Christian Reinboth | Ulrich H.P. Fischer, Matthias Haupt, Christian Reinboth | Realization of an Economical Polymer Optical Fiber Demultiplexer | 2006 International Students and Young Scientists Workshop "Photonics
and Microsystems" | null | null | null | physics.optics physics.gen-ph | null | Polymer Optical Fiber (POF) can be and are being used in various fields of
applications. Two of the main fields are the automotive and the home
entertainment sector. The POF can be applied in several different optical
communication systems as automotive multi-media busses or in-house Ethernet
systems.
The requirements of bandwidth are increasing very fast in these sectors and
therefore solutions that satisfy these demands are of high actuality. One
solution is to use the wavelength division multiplexing (WDM) technique. Here,
several different wavelengths can carry information over one POF fiber. All
wavelengths that are transmitted over the fiber, must be separated at the
receiver to regain and redirect the information channels. These separators are
so-called Demultiplexers.
There are several systems available on the market, which are all afflicted
with certain disadvantages. But all these solutions have one main disadvantage,
they are all too expensive for most of the applications mentioned above. So the
goal of this study is to develop an economical Demultiplexer for WDM
transmission over POF.
The main idea is to separate the chromatic light in its monochromatic
components with the help of a prism with low reciprocal dispersive power. The
prism and the other assemblies, which are needed to adjust the optical path,
should be manufactured in injection molding technique. This manufacturing
technique is a very simple and economical way to produce a mass production
applicable Demultiplexer for POF.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 16:21:43 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Fischer",
"Ulrich H. P.",
""
],
[
"Haupt",
"Matthias",
""
],
[
"Reinboth",
"Christian",
""
]
] |
0705.3965 | Avraham Gal | E. Friedman and A. Gal | In-medium nuclear interactions of low-energy hadrons | 86 pages, 44 figures, slight revisions, references added, Physics
Reports (in press) | Phys.Rept.452:89-153,2007 | 10.1016/j.physrep.2007.08.002 | null | nucl-th | null | Experimental and theoretical developments of the last decade in the study of
exotic atoms and some related low-energy reactions are reviewed, in order to
provide information on the in-medium hadron-nucleon t matrix over a wide range
of densities up to central nuclear densities. In particular, we review pionic
deeply bound atomic states and related evidence for partial restoration of
chiral symmetry in dense nuclear matter. The case for relatively narrow deeply
bound atomic states for antikaons and antiprotons is made, based on the physics
of strong nuclear absorption. Recent experimental suggestions for signals of
antikaon-nuclear deeply bound states are reviewed, and dynamical models for
calculating binding energies, widths and densities of antikaon nuclear states
are discussed. Specific features of low-energy in-medium interactions of kaons,
antiprotons and of Sigma hyperons are discussed, and suggestions to study
experimentally Cascade atoms are reviewed.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 16:24:36 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Aug 2007 20:06:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Friedman",
"E.",
""
],
[
"Gal",
"A.",
""
]
] |
0705.3966 | N. Odegard | N. Odegard, R. G. Arendt, E. Dwek, L. M. Haffner, M. G. Hauser, R. J.
Reynolds | Determination of the Far-Infrared Cosmic Background Using COBE/DIRBE and
WHAM Data | 38 pages, 8 figures. Accepted for publication in ApJ | Astrophys.J.667:11-25,2007 | 10.1086/520079 | null | astro-ph | null | Determination of the cosmic infrared background (CIB) at far infrared
wavelengths using COBE/DIRBE data is limited by the accuracy to which
foreground interplanetary and Galactic dust emission can be modeled and
subtracted. Previous determinations of the far infrared CIB (e.g., Hauser et
al. 1998) were based on the detection of residual isotropic emission in skymaps
from which the emission from interplanetary dust and the neutral interstellar
medium were removed. In this paper we use the Wisconsin H-alpha Mapper (WHAM)
Northern Sky Survey as a tracer of the ionized medium to examine the effect of
this foreground component on determination of the CIB. We decompose the DIRBE
far infrared data for five high Galactic latitude regions into H I and H-alpha
correlated components and a residual component. We find the H-alpha correlated
component to be consistent with zero for each region, and we find that addition
of an H-alpha correlated component in modeling the foreground emission has
negligible effect on derived CIB results. Our CIB detections and 2 sigma upper
limits are essentially the same as those derived by Hauser et al. and are given
by nu I_nu (nW m-2 sr-1) < 75, < 32, 25 +- 8, and 13 +- 3 at 60, 100, 140, and
240 microns, respectively. Our residuals have not been subjected to a detailed
anisotropy test, so our CIB results do not supersede those of Hauser et al. We
derive upper limits on the 100 micron emissivity of the ionized medium that are
typically about 40% of the 100 micron emissivity of the neutral atomic medium.
This low value may be caused in part by a lower dust-to-gas mass ratio in the
ionized medium than in the neutral medium, and in part by a shortcoming of
using H-alpha intensity as a tracer of far infrared emission.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 16:31:08 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Odegard",
"N.",
""
],
[
"Arendt",
"R. G.",
""
],
[
"Dwek",
"E.",
""
],
[
"Haffner",
"L. M.",
""
],
[
"Hauser",
"M. G.",
""
],
[
"Reynolds",
"R. J.",
""
]
] |
0705.3967 | Subhayan Mandal | Subhayan Mandal, Pankaj Jain | Circumventing Astrophysical Bounds Upon PVLAS Experiment | 4 pages, 4 figures, Brief talk presented at XVII DAE-BRNS HEP
Symposium, 2006. References Added. Typos Corrected. Introduction Rewritten | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of evading astrophysical bound on light
pseudoscalars. We argue that the solar bounds can be evaded if we have a
sufficiently strong self-coupling of the pseudoscalars. The required coupling
does not conflict with any known experimental bounds. We also show that it is
possible to find a coupling range such that the recent PVLAS experiment is not
in conflict with any astrophysical bounds.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:25:54 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Oct 2008 11:26:55 GMT"
}
] | 2008-10-27T00:00:00 | [
[
"Mandal",
"Subhayan",
""
],
[
"Jain",
"Pankaj",
""
]
] |
0705.3968 | Bin Zhang | Bin Zhang (1), Lie-Wen Chen (2), Che Ming Ko (3) ((1) Arkansas State
U, (2) Shanghai Jiao Tong U, (3) Texas A-M) | Equation of state of the hot dense matter in a multi-phase transport
model | null | J. Phys. G: Nucl. Part. Phys. 35 (2008) 065103 | 10.1088/0954-3899/35/6/065103 | null | nucl-th | null | Within the framework of a multi-phase transport model, we study the equation
of state and pressure anisotropy of the hot dense matter produced in central
relativistic heavy ion collisions. Both are found to depend on the
hadronization scheme and scattering cross sections used in the model.
Furthermore, only partial thermalization is achieved in the produced matter as
a result of its fast expansion.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 16:44:33 GMT"
}
] | 2008-04-29T00:00:00 | [
[
"Zhang",
"Bin",
""
],
[
"Chen",
"Lie-Wen",
""
],
[
"Ko",
"Che Ming",
""
]
] |
0705.3969 | Rupert Frank | Rupert L. Frank, Ari Laptev, Stanislav Molchanov | Eigenvalue estimates for magnetic Schroedinger operators in domains | 15 pages | null | null | null | math.SP math-ph math.MP | null | Inequalities are derived for sums and quotients of eigenvalues of magnetic
Schroedinger operators with non-negative electric potentials in domains. The
bounds reflect the correct order of growth in the semi-classical limit.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 17:51:35 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Frank",
"Rupert L.",
""
],
[
"Laptev",
"Ari",
""
],
[
"Molchanov",
"Stanislav",
""
]
] |
0705.3970 | Itziar de Gregorio-Monsalvo | Guido Garay, Luis F. Rodriguez, and Itziar de Gregorio-Monsalvo | VLA observations of candidate high-mass protostellar objects at 7 mm | 17 pages, 5 figures, accepted by The Astronomical Journal | Astron.J.134:906-911,2007 | 10.1086/520334 | null | astro-ph | null | We present radio continuum observations at 7 mm made using the Very Large
Array towards three massive star forming regions thought to be in very early
stages of evolution selected from the sample of Sridharan et al. (2002).
Emission was detected towards all three sources (IRAS 18470-0044, IRAS
19217+1651 and IRAS 23151+5912). We find that in all cases the 7 mm emission
corresponds to thermal emission from ionized gas. The regions of ionized gas
associated with IRAS 19217+1651 and IRAS 23151+5912 are hypercompact with
diameters of 0.009 and 0.0006 pc, and emission measures of 7.0 x 10^8 and 2.3 x
10^9 pc cm^(-6), respectively.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 18:16:02 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Garay",
"Guido",
""
],
[
"Rodriguez",
"Luis F.",
""
],
[
"de Gregorio-Monsalvo",
"Itziar",
""
]
] |
0705.3971 | Vyacheclav Borisov | Vyacheslav S. Borisov | On dynamics of multi-phase elastic-plastic media | 16 pages | null | null | null | physics.flu-dyn | null | The paper is concerned with dynamics of multi-phase media consisting of a
solid permeable material and a compressible Newtonian fluid. Governing
macroscopic equations are derived starting from the space-averaged microscopic
mass and momentum balances. The Reynolds stress models (i.e., momentum
dispersive fluxes) are discussed, and a suitable model is developed. In the
case of granular media the solid constituent is considered as an
elastic-plastic matrix, and the yield condition is approximated by Coulomb
friction law. It is revealed that the classical principle of maximum plastic
work is not, in general, valid for granular media, and an appropriate
variational principle is developed. This novel principle coincides with the
maximum plastic work principle for the case of cohesionless and free from
internal friction granular media.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 21:50:06 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Borisov",
"Vyacheslav S.",
""
]
] |
0705.3972 | Edriss Titi | Varga K. Kalantarov and Edriss S. Titi | Global Attractors and Determining Modes for the 3D Navier-Stokes-Voight
Equations | null | null | null | null | math.AP math-ph math.MP | null | We investigate the long-term dynamics of the three-dimensional
Navier-Stokes-Voight model of viscoelastic incompressible fluid. Specifically,
we derive upper bounds for the number of determining modes for the 3D
Navier-Stokes-Voight equations and for the dimension of a global attractor of a
semigroup generated by these equations. Viewed from the numerical analysis
point of view we consider the Navier-Stokes-Voight model as a non-viscous
(inviscid) regularization of the three-dimensional Navier-Stokes equations.
Furthermore, we also show that the weak solutions of the Navier-Stokes-Voight
equations converge, in the appropriate norm, to the weak solutions of the
inviscid simplified Bardina model, as the viscosity coefficient $\nu \to 0$.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 18:32:54 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Kalantarov",
"Varga K.",
""
],
[
"Titi",
"Edriss S.",
""
]
] |
0705.3973 | Jordi Sod-Hoffs | Jordi Sod-Hoffs, Egor D Rodchenko | On the properties of the Ernst-Manko-Ruiz equatorially antisymmetric
solutions | 15 pages, 5 figures, submitted to Classical and Quantum Gravity | Class.Quant.Grav.24:4617-4630,2007 | 10.1088/0264-9381/24/18/004 | null | gr-qc | null | Two new equatorially antisymmetric solutions recently published by Ernst et
al are studied. For both solutions the full set of metric functions is derived
in explicit analytic form and the behavior of the solutions on the symmetry
axis is analyzed. It is shown in particular that two counter-rotating equal
Kerr-Newman-NUT objects will be in equilibrium when the condition
m^2+\nu^2=q^2+b^2 is verified, whereas two counter-rotating equal masses
endowed with arbitrary magnetic and electric dipole moments cannot reach
equilibrium under any choice of the parameters, so that a massless strut
between them will always be present.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 19:06:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sod-Hoffs",
"Jordi",
""
],
[
"Rodchenko",
"Egor D",
""
]
] |
0705.3974 | Antoine Suarez | Antoine Suarez | Classical Demons and Quantum Angels: On 't Hooft's deterministic Quantum
Mechanics | 13 pages, 3 figures | null | null | null | quant-ph gr-qc | null | It is argued that 't Hooft's deterministic program does not disenchant the
quantum world but rather inspires the incantation of the classical one.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 21:26:04 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Suarez",
"Antoine",
""
]
] |
0705.3975 | Satoshi Honda | Satoshi Honda, Wako Aoki, Yuhri Ishimaru, and Shinya Wanajo | Neutron-capture elements in the very metal-poor star HD88609: another st
ar with excesses of light neutron-capture elements | 18 pages, 6 figures, accepted for publication in ApJ | Astrophys.J.666:1189-1197,2007 | 10.1086/520034 | null | astro-ph | null | We obtained a high resolution, high signal-to-noise UV-blue spectrum of the
extremely metal-poor red giant HD88609 to determine the abundances of heavy
elements. Nineteen neutron-capture elements are detected in the spectrum. Our
analysis revealed that this object has large excesses of light neutron-capture
elements while heavy neutron-capture elements are deficient. The abundance
pattern shows a continuously decreasing trend, as a function of atomic number,
from Sr to Yb, which is quite different from those in stars with excesses of
r-process elements. Such an abundance pattern is very similar to that of
HD122563 that was studied by our previous work. The results indicate that the
abundance pattern found in the two stars could represent the pattern produced
by the nucleosynthesis process that provided light neutron-capture elements in
the very early Galaxy.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 19:23:50 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Honda",
"Satoshi",
""
],
[
"Aoki",
"Wako",
""
],
[
"Ishimaru",
"Yuhri",
""
],
[
"Wanajo",
"Shinya",
""
]
] |
0705.3976 | Stanislav Fisenko | S.I. Fisenko, I.S. Fisenko | Concept of a thermonuclear reactor based on gravity retention of
high-temperature plasma | 13 pages, 12 figures | null | null | null | physics.gen-ph | null | In the present paper the realization of the obtained results in relation to
the dense high- temperature plasma of multivalent ions including experimental
data interpretation is discussed.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 19:26:56 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Fisenko",
"S. I.",
""
],
[
"Fisenko",
"I. S.",
""
]
] |
0705.3977 | Roberto Soria | R. Soria (MSSL/CfA), A. Baldi (CfA), G. Risaliti (Arcetri), G.
Fabbiano (CfA), A. R. King (Leicester), V. La Parola (INAF-Palermo), A. Zezas
(CfA) | New flaring of an ultraluminous X-ray source in NGC 1365 | 14 pages, to appear in MNRAS | Mon.Not.Roy.Astron.Soc.379:1313-1324,2007 | 10.1111/j.1365-2966.2007.12031.x | null | astro-ph | null | We have studied a highly variable ultraluminous X-ray source (ULX) in the
Fornax galaxy NGC 1365, with a series of 12 Chandra and XMM-Newton observations
between 2002 and 2006. In 2006 April, the source peaked at a luminosity ~ 3 x
10^{40} erg/s in the 0.3-10 keV band (similar to the maximum luminosity found
by ASCA in 1995), and declined on an e-folding timescale ~ 3 days. The X-ray
spectrum is always dominated by a broad power-law-like component. When the
source is seen at X-ray luminosities ~ 10^{40} erg/s, an additional soft
thermal component (which we interpret as emission from the accretion disk)
contributes ~ 1/4 of the X-ray flux; when the luminosity is higher, ~ 3 x
10^{40} erg/s, the thermal component is not detected and must contribute < 10%
of the flux. At the beginning of the decline, ionized absorption is detected
around 0.5-2 keV; it is a possible signature of a massive outflow. The
power-law is always hard, with a photon index Gamma ~ 1.7 (and even flatter at
times), as is generally the case with bright ULXs. We speculate that this
source and perhaps most other bright ULXs are in a high/hard state: as the
accretion rate increases well above the Eddington limit, more and more power is
extracted from the inner region of the inflow through non-radiative channels,
and is used to power a Comptonizing corona, jet or wind. The observed thermal
component comes from the standard outer disk; the transition radius between
outer standard disk and Comptonizing inner region moves further out and to
lower disk temperatures as the accretion rate increases. This produces the
observed appearance of a large, cool disk. Based on X-ray luminosity and
spectral arguments, we suggest that this accreting black hole has a likely mass
~ 50-150 Msun (even without accounting for possible beaming).
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 20:17:20 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Soria",
"R.",
"",
"MSSL/CfA"
],
[
"Baldi",
"A.",
"",
"CfA"
],
[
"Risaliti",
"G.",
"",
"Arcetri"
],
[
"Fabbiano",
"G.",
"",
"CfA"
],
[
"King",
"A. R.",
"",
"Leicester"
],
[
"La Parola",
"V.",
"",
"INAF-Palermo"
],
[
"Zezas",
"A.",
"",
"CfA"
]
] |
0705.3978 | Bianca Letizia Cerchiai | Fabio Bernardoni, Sergio L. Cacciatori, Bianca L. Cerchiai, Antonio
Scotti | Mapping the geometry of the F4 group | 50 pages; some typos corrected | Adv.Theor.Math.Phys.12:889-994,2008 | null | UCB-PTH-07/07, IFIC/07-21, FTUV/07-0527 | math-ph hep-th math.MP | null | In this paper we present a construction of the compact form of the
exceptional Lie group F4 by exponentiating the corresponding Lie algebra f4. We
realize F4 as the automorphisms group of the exceptional Jordan algebra, whose
elements are 3 x 3 hermitian matrices with octonionic entries. We use a
parametrization which generalizes the Euler angles for SU(2) and is based on
the fibration of F4 via a Spin(9) subgroup as a fiber. This technique allows us
to determine an explicit expression for the Haar invariant measure on the F4
group manifold. Apart from shedding light on the structure of F4 and its coset
manifold OP2=F4/Spin(9), the octonionic projective plane, these results are a
prerequisite for the study of E6, of which F4 is a (maximal) subgroup.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:31:22 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 19:02:36 GMT"
}
] | 2009-12-15T00:00:00 | [
[
"Bernardoni",
"Fabio",
""
],
[
"Cacciatori",
"Sergio L.",
""
],
[
"Cerchiai",
"Bianca L.",
""
],
[
"Scotti",
"Antonio",
""
]
] |
0705.3979 | Mamniashvili Grigor I | A. Akhkalkatsi, T. Gegechkori, G. Mamniashvili, Z. Shermadini, A.N.
Pogorely, O.M. Kuzmak | Influence of pulsed magnetic field on single- and two-pulse nuclear spin
echoes in multidomain magnets | 11 pages | null | null | null | cond-mat.mtrl-sci | null | By the method of additional pulsed magnetic field influence in different
magnetic materials (half metals, manganites, lithium ferrite, cobalt) it is
established the analogy of time diagrams of magnetic pulse influence on single-
and two pulse echoes in magnets when the distortion mechanism of single-pulse
echo formation is effective, and the absence of such analogy in the case of
lithium ferrite where the multipulse mechanism of single-pulse echo formation
is effective.
It is shown also that the timing and frequency diagrams of magnetic pulse
influence on the two-pulse echo signals, corresponding to the symmetric and
asymmetric magnetic pulse applications in the studied magnets, are defined by
their domain walls parameters and could serve for their qualitative and
quantitative characterization.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 21:36:06 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Akhkalkatsi",
"A.",
""
],
[
"Gegechkori",
"T.",
""
],
[
"Mamniashvili",
"G.",
""
],
[
"Shermadini",
"Z.",
""
],
[
"Pogorely",
"A. N.",
""
],
[
"Kuzmak",
"O. M.",
""
]
] |
0705.3980 | Kendrick Smith | Kendrick M. Smith, Oliver Zahn, Olivier Dore | Detection of Gravitational Lensing in the Cosmic Microwave Background | 27 pages, 20 figures | Phys.Rev.D76:043510,2007 | 10.1103/PhysRevD.76.043510 | null | astro-ph | null | Gravitational lensing of the cosmic microwave background (CMB), a
long-standing prediction of the standard cosmolgical model, is ultimately
expected to be an important source of cosmological information, but first
detection has not been achieved to date. We report a 3.4 sigma detection, by
applying quadratic estimator techniques to all sky maps from the Wilkinson
Microwave Anisotropy Probe (WMAP) satellite, and correlating the result with
radio galaxy counts from the NRAO VLA Sky Survey (NVSS). We present our
methodology including a detailed discussion of potential contaminants. Our
error estimates include systematic uncertainties from density gradients in
NVSS, beam effects in WMAP, Galactic microwave foregrounds, resolved and
unresolved CMB point sources, and the thermal Sunyaev-Zeldovich effect.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:02:48 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Smith",
"Kendrick M.",
""
],
[
"Zahn",
"Oliver",
""
],
[
"Dore",
"Olivier",
""
]
] |
0705.3981 | Stanley L. Robertson | Stanley L. Robertson | A Gedanken Experiment For Gravitomagnetism | 6 pages | null | null | null | gr-qc | null | A gedanken experiment implies the existence of gravitomagnetism and raises a
question about what we know about the weak-field limit of the gravitomagnetic
field of General Relativity.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 21:52:55 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Robertson",
"Stanley L.",
""
]
] |
0705.3982 | Tolga Guver | Tolga Guver, Feryal Ozel, Ersin Gogus | Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis | Replaced with the accepted version | null | 10.1086/525840 | null | astro-ph | null | We analyze archival Chandra and XMM-Newton data of 4U 0142+61 within the
context of the Surface Thermal Emission and Magnetospheric Scattering model. We
show that 4U 0142+61 spectrum can be fit very well with this physical model
that contains only four parameters. The system parameters can be tightly
constrained from the fits, yielding a surface magnetic field strength of
B=(4.75 \pm 0.02)x 10^{14} G, a surface temperature of kT = 0.309 \pm 0.001$
keV and a scattering optical depth of a few in the magnetosphere. These values
do not vary between observations due to the stability of the source within the
window of the observations. The detailed fits yield $\chi^2$ values that are
statistically much better than the traditionally employed blackbody+power-law
and two blackbody fits. The spectroscopically measured surface magnetic field
strength is higher than, but within, the theoretical uncertainties of the value
inferred from the dipole spindown formula.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 21:57:11 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 16:45:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Guver",
"Tolga",
""
],
[
"Ozel",
"Feryal",
""
],
[
"Gogus",
"Ersin",
""
]
] |
0705.3983 | Emmanuel Tannenbaum | Yoav Raz, Emmanuel Tannenbaum | The influence of horizontal gene transfer on the mean fitness of
unicellular populations in static environments | 27 pages, 4 figures | null | null | null | q-bio.PE q-bio.GN | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper develops a mathematical model describing the influence that
conjugation-mediated Horizontal Gene Transfer (HGT) has on the
mutation-selection balance in an asexually reproducing population of
unicellular, prokaryotic organisms. It is assumed that mutation-selection
balance is reached in the presence of a fixed background concentration of
antibiotic, to which the population must become resistant in order to survive.
We analyze the behavior of the model in the limit of low and high
antibiotic-induced first-order death rate constants, and find that the highest
mean fitness is obtained at low rates of bacterial conjugation. As the rate of
conjugation crosses a threshold, the mean fitness decreases to a minimum, and
then rises asymptotically to a limiting value as the rate of conjugation
becomes infinitely large. However, this limiting value is smaller than the mean
fitness obtained in the limit of low conjugation rate. This dependence of the
mean fitness on the conjugation rate is fairly small for the parameter ranges
we have considered, and disappears as the first-order death rate constant due
to the presence of antibiotic approaches zero. For large values of the
antibiotic death rate constant, we have obtained an analytical solution for the
behavior of the mean fitness that agrees well with the results of simulations.
The results of this paper suggest that conjugation-mediated HGT has a slightly
deleterious effect on the mean fitness of a population at mutation-selection
balance. Therefore, we argue that HGT confers a selective advantage by allowing
for faster adaptation to a new or changing environment. The results of this
paper are consistent with the observation that HGT can be promoted by
environmental stresses on a population.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 22:13:23 GMT"
},
{
"version": "v2",
"created": "Sat, 4 Jul 2009 20:02:39 GMT"
}
] | 2009-07-06T00:00:00 | [
[
"Raz",
"Yoav",
""
],
[
"Tannenbaum",
"Emmanuel",
""
]
] |
0705.3984 | Melissa L. Enoch | M. L. Enoch (1), J. Glenn (2), N. J. Evans II (3), A. I. Sargent (1),
K. E. Young (3,4), and T. L. Huard (5) ((1) Caltech, (2) Univ. of Colorado,
Boulder, (3) Univ. of Texas, Austin, (4) Nicholls State Univ., (5) CfA) | Comparing Star Formation on Large Scales in the c2d Legacy Clouds:
Bolocam 1.1 mm Dust Continuum Surveys of Serpens, Perseus, and Ophiuchus | 32 pages, including 18 figures, accepted for publication in ApJ | Astrophys.J.666:982-1001,2007 | 10.1086/520321 | null | astro-ph | null | We have undertaken an unprecedentedly large 1.1 millimeter continuum survey
of three nearby star forming clouds using Bolocam at the Caltech Submillimeter
Observatory. We mapped the largest areas in each cloud at millimeter or
submillimeter wavelengths to date: 7.5 sq. deg in Perseus (Paper I), 10.8 sq.
deg in Ophiuchus (Paper II), and 1.5 sq. deg in Serpens with a resolution of
31", detecting 122, 44, and 35 cores, respectively. Here we report on results
of the Serpens survey and compare the three clouds. Average measured angular
core sizes and their dependence on resolution suggest that many of the observed
sources are consistent with power-law density profiles. Tests of the effects of
cloud distance reveal that linear resolution strongly affects measured source
sizes and densities, but not the shape of the mass distribution. Core mass
distribution slopes in Perseus and Ophiuchus (alpha=2.1+/-0.1 and
alpha=2.1+/-0.3) are consistent with recent measurements of the stellar IMF,
whereas the Serpens distribution is flatter (alpha=1.6+/-0.2). We also compare
the relative mass distribution shapes to predictions from turbulent
fragmentation simulations. Dense cores constitute less than 10% of the total
cloud mass in all three clouds, consistent with other measurements of low
star-formation efficiencies. Furthermore, most cores are found at high column
densities; more than 75% of 1.1 mm cores are associated with Av>8 mag in
Perseus, 15 mag in Serpens, and 20-23 mag in Ophiuchus.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 22:56:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Enoch",
"M. L.",
""
],
[
"Glenn",
"J.",
""
],
[
"Evans",
"N. J.",
"II"
],
[
"Sargent",
"A. I.",
""
],
[
"Young",
"K. E.",
""
],
[
"Huard",
"T. L.",
""
]
] |
0705.3985 | George B. Martins | George B. Martins (Department of Physics, Oakland University, MI, USA)
Wolfram Brenig (Institut fur Theoretische Physik, Technische Universitat
Braunschweig, Germany) | Static Holes in the Geometrically Frustrated Bow Tie Ladder | 7 pages, 9 eps figures | J. Phys.: Condens. Matter 20 (2008) 415204 | 10.1088/0953-8984/20/41/415204 | null | cond-mat.str-el | null | We investigate the doping of a geometrically frustrated spin ladder with
static holes by a complementary approach using exact diagonalization and
quantum dimers. Results for thermodynamic properties, the singlet density of
states, the hole-binding energy and the spin correlations will be presented.
For the undoped systems the ground state is non-degenerate, with
translationally invariant nearest-neighbor spin correlations. In the doped
case, we find that static holes polarize their vicinity by a localization of
singlets in order to reduce the frustration. This polarization induces short
range repulsive forces between two holes and an oscillatory behavior of the
long range two-hole energy. For most quantities investigated, we find very good
agreement between the quantum dimer approach and the results from exact
diagonalization.
| [
{
"version": "v1",
"created": "Sun, 27 May 2007 23:17:44 GMT"
}
] | 2010-01-20T00:00:00 | [
[
"Martins",
"George B.",
"",
"Department of Physics, Oakland University, MI, USA"
],
[
"Brenig",
"Wolfram",
"",
"Institut fur Theoretische Physik, Technische Universitat\n Braunschweig, Germany"
]
] |
0705.3986 | Janina Maultzsch | Yang Wu, Janina Maultzsch, Ernst Knoesel, Bhupesh Chandra, Mingyuan
Huang, Matthew Y. Sfeir, Louis E. Brus, J. Hone, and Tony F. Heinz (Columbia
University New York) | Variable Electron-Phonon Coupling in Isolated Metallic Carbon Nanotubes
Observed by Raman Scattering | 13 pages; submitted to Phys. Rev. Lett | Phys. Rev. Lett. 99, 027402 (2007) | 10.1103/PhysRevLett.99.027402 | null | cond-mat.mtrl-sci | null | We report the existence of broad and weakly asymmetric features in the
high-energy (G) Raman modes of freely suspended metallic carbon nanotubes of
defined chiral index. A significant variation in peak width (from 12 cm-1 to
110 cm-1) is observed as a function of the nanotube's chiral structure. When
the nanotubes are electrostatically gated, the peak widths decrease. The
broadness of the Raman features is understood as the consequence of coupling of
the phonon to electron-hole pairs, the strength of which varies with the
nanotube chiral index and the position of the Fermi energy.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 00:10:36 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Wu",
"Yang",
"",
"Columbia\n University New York"
],
[
"Maultzsch",
"Janina",
"",
"Columbia\n University New York"
],
[
"Knoesel",
"Ernst",
"",
"Columbia\n University New York"
],
[
"Chandra",
"Bhupesh",
"",
"Columbia\n University New York"
],
[
"Huang",
"Mingyuan",
"",
"Columbia\n University New York"
],
[
"Sfeir",
"Matthew Y.",
"",
"Columbia\n University New York"
],
[
"Brus",
"Louis E.",
"",
"Columbia\n University New York"
],
[
"Hone",
"J.",
"",
"Columbia\n University New York"
],
[
"Heinz",
"Tony F.",
"",
"Columbia\n University New York"
]
] |
0705.3987 | Tim D. Cochran | Tim D. Cochran (Rice University), Shelly Harvey (Rice University),
Constance Leidy (University of Pennsylvania and Wesleyan University) | Knot concordance and Blanchfield duality | 54 pages, 16 figures | null | null | null | math.GT | null | We introduce a new technique for showing classical knots and links are not
slice. As one application we resolve a long-standing question as to whether
certain natural families of knots contain topologically slice knots. We also
present a simpler proof of the result of Cochran-Teichner that the successive
quotients of the integral terms of the Cochran-Orr-Teichner filtration of the
knot concordance group have rank 1. For links we have similar results. We show
that the iterated Bing doubles of many algebraically slice knots are not
topologically slice. Some of the proofs do not use the existence of the
Cheeger-Gromov bound, a deep analytical tool used by Cochran-Teichner. Our main
examples are actually boundary links but cannot be detected in the algebraic
boundary link concordance group, nor by any $\rho$ invariants associated to
solvable representations into finite unitary groups.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:13:05 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Cochran",
"Tim D.",
"",
"Rice University"
],
[
"Harvey",
"Shelly",
"",
"Rice University"
],
[
"Leidy",
"Constance",
"",
"University of Pennsylvania and Wesleyan University"
]
] |
0705.3988 | Hiroshi Kontani | Hideyuki Hara, Hiroshi Kontani | Theory of Thermal Conductivity in High-Tc Superconductors below Tc:
Comparison between Hole-Doped and Electron-Doped Systems | 5 pages, to be published in J. Phys. Soc. Jpn. Vol.76 No.7 | null | 10.1143/JPSJ.76.073705 | null | cond-mat.supr-con cond-mat.str-el | null | In hole-doped high-Tc superconductors, thermal conductivity increases
drastically just below Tc, which has been considered as a hallmark of a nodal
gap. In contrast, such a coherence peak in thermal conductivity is not visible
in electron-doped compounds, which may indicate a full-gap state such as a
(d+is)-wave state. To settle this problem, we study the thermal conductivity in
the Hubbard model using the fluctuation-exchange (FLEX) approximation, which
predicts that the nodal d-wave state is realized in both hole-doped and
electron-doped compounds. The contrasting behavior of thermal conductivity in
both compounds originates from the differences in the hot/cold spot structure.
In general, a prominent coherence peak in thermal conductivity appears in
line-node superconductors only when the cold spot exists on the nodal line.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 01:03:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hara",
"Hideyuki",
""
],
[
"Kontani",
"Hiroshi",
""
]
] |
0705.3989 | Domenico Napoletani | D. Napoletani, T. Sauer, D. C. Struppa, E. Petricoin, L. Liotta | Augmented Sparse Reconstruction of Protein Signaling Networks | 24 pages, 6 figures | Journal of Theoretical Biology, vol. 255, Issue 1, 40-52 (2008) | null | null | physics.data-an q-bio.MN | null | The problem of reconstructing and identifying intracellular protein signaling
and biochemical networks is of critical importance in biology today. We sought
to develop a mathematical approach to this problem using, as a test case, one
of the most well-studied and clinically important signaling networks in biology
today, the epidermal growth factor receptor (EGFR) driven signaling cascade.
More specifically, we suggest a method, augmented sparse reconstruction, for
the identification of links among nodes of ordinary differential equation (ODE)
networks from a small set of trajectories with different initial conditions.
Our method builds a system of representation by using a collection of integrals
of all given trajectories and by attenuating block of terms in the
representation itself. The system of representation is then augmented with
random vectors, and minimization of the 1-norm is used to find sparse
representations for the dynamical interactions of each node. Augmentation by
random vectors is crucial, since sparsity alone is not able to handle the large
error-in-variables in the representation. Augmented sparse reconstruction
allows to consider potentially very large spaces of models and it is able to
detect with high accuracy the few relevant links among nodes, even when
moderate noise is added to the measured trajectories. After showing the
performance of our method on a model of the EGFR protein network, we sketch
briefly the potential future therapeutic applications of this approach.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 01:13:31 GMT"
},
{
"version": "v2",
"created": "Fri, 16 Nov 2007 02:09:38 GMT"
}
] | 2012-06-15T00:00:00 | [
[
"Napoletani",
"D.",
""
],
[
"Sauer",
"T.",
""
],
[
"Struppa",
"D. C.",
""
],
[
"Petricoin",
"E.",
""
],
[
"Liotta",
"L.",
""
]
] |
0705.3990 | Tadashi Wadyama | Tadashi Wadayama | Interior Point Decoding for Linear Vector Channels | 18 pages, 17 figures, The paper has been submitted to IEEE
Transaction on Information Theory | null | 10.1088/1742-6596/95/1/012009 | null | cs.IT math.IT | null | In this paper, a novel decoding algorithm for low-density parity-check (LDPC)
codes based on convex optimization is presented. The decoding algorithm, called
interior point decoding, is designed for linear vector channels. The linear
vector channels include many practically important channels such as inter
symbol interference channels and partial response channels. It is shown that
the maximum likelihood decoding (MLD) rule for a linear vector channel can be
relaxed to a convex optimization problem, which is called a relaxed MLD
problem. The proposed decoding algorithm is based on a numerical optimization
technique so called interior point method with barrier function. Approximate
variations of the gradient descent and the Newton methods are used to solve the
convex optimization problem. In a decoding process of the proposed algorithm, a
search point always lies in the fundamental polytope defined based on a
low-density parity-check matrix. Compared with a convectional joint message
passing decoder, the proposed decoding algorithm achieves better BER
performance with less complexity in the case of partial response channels in
many cases.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 01:14:19 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 04:11:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wadayama",
"Tadashi",
""
]
] |
0705.3991 | Mun Dae Kim | Mun Dae Kim, Sam Young Cho | Macroscopic Greenberger-Horne-Zeilinger and W States in Flux Qubits | 5 pages, 3 figures, version to appear in Phys. Rev. B (Rapid Comm.) | Phys. Rev. B 77, 100508(R) (2008) | 10.1103/PhysRevB.77.100508 | null | cond-mat.supr-con cond-mat.mes-hall | null | We investigate two types of genuine three-qubit entanglement, known as the
Greenberger-Horne-Zeilinger(GHZ) and W states, in a macroscopic quantum system.
Superconducting flux qubits are considered theoretically in order to generate
such states. A phase coupling is proposed to offer enough strength of
interactions between qubits. While an excited state can be the W state, the GHZ
state is formed at the ground state of the three flux qubits. The GHZ and W
states are shown to be robust against external flux fluctuations for feasible
experimental realizations.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 01:54:02 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Feb 2008 08:33:23 GMT"
}
] | 2012-02-24T00:00:00 | [
[
"Kim",
"Mun Dae",
""
],
[
"Cho",
"Sam Young",
""
]
] |
0705.3992 | Tadashi Wadyama | Tadashi Wadayama | Average Stopping Set Weight Distribution of Redundant Random Matrix
Ensembles | 14 pages, 7 figures, Conference version to appear at the 2007 IEEE
International Symposium on Information Theory, Nice, France, June 2007 | null | 10.1109/ISIT.2007.4557663 | null | cs.IT math.IT | null | In this paper, redundant random matrix ensembles (abbreviated as redundant
random ensembles) are defined and their stopping set (SS) weight distributions
are analyzed. A redundant random ensemble consists of a set of binary matrices
with linearly dependent rows. These linearly dependent rows (redundant rows)
significantly reduce the number of stopping sets of small size. An upper and
lower bound on the average SS weight distribution of the redundant random
ensembles are shown. From these bounds, the trade-off between the number of
redundant rows (corresponding to decoding complexity of BP on BEC) and the
critical exponent of the asymptotic growth rate of SS weight distribution
(corresponding to decoding performance) can be derived. It is shown that, in
some cases, a dense matrix with linearly dependent rows yields asymptotically
(i.e., in the regime of small erasure probability) better performance than
regular LDPC matrices with comparable parameters.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 01:55:36 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Wadayama",
"Tadashi",
""
]
] |
0705.3993 | Raoul Dillenschneider | Raoul Dillenschneider, Jung Hoon Kim, Jung Hoon Han | Vector chiral states in low-dimensional quantum spin systems | 4 pages, 1 figure | Journal of the Korean Physical Society 53, 732 (2008) | 10.3938/jkps.53.732 | null | cond-mat.str-el | null | A class of exact spin ground states with nonzero averages of vector spin
chirality, $<\v{S}_i \times \v{S}_j \cdot \hat{z}>$, is presented. It is
obtained by applying non-uniform O(2) rotations of spin operators in the XY
plane on the SU(2)-invariant Affleck-Kennedy-Lieb-Tasaki (AKLT) states and
their parent Hamiltonians. Excitation energies of the new ground states are
studied with the use of single-mode approximation in one dimension for S=1. The
excitation gap remains robust. Construction of chiral AKLT states is shown to
be possible in higher dimensions. We also present a general idea to produce
vector chirality-condensed ground states as non-uniform O(2) rotations of the
non-chiral parent states. Dzyaloshinskii-Moriya interaction is shown to imply
non-zero spin chirality.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 12:36:03 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 07:44:46 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Dillenschneider",
"Raoul",
""
],
[
"Kim",
"Jung Hoon",
""
],
[
"Han",
"Jung Hoon",
""
]
] |
0705.3994 | Akinori Nishino | Akinori Nishino and Naomichi Hatano | Resonance in an open quantum dot system with a Coulomb interaction: a
Bethe-ansatz approach | 8 pages, 2 figures | J. Phys. Soc. Jpn. 76 (2007) 063002 | 10.1143/JPSJ.76.063002 | null | cond-mat.str-el cond-mat.mes-hall | null | An open quantum system consisting of a quantum dot with a Coulomb interaction
and two leads without interactions is studied. The many-body scattering states
are constructed with the Bethe-ansatz approach. The expectation value of the
electric current is exactly calculated for the scattering states to observe
resonance peaks due to many-body scattering.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 02:30:35 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Nishino",
"Akinori",
""
],
[
"Hatano",
"Naomichi",
""
]
] |
0705.3995 | Tadashi Wadyama | Tadashi Wadayama | On Undetected Error Probability of Binary Matrix Ensembles | 9 pages, a part of the paper was submitted to ISIT 2008 | null | null | null | cs.IT math.IT | null | In this paper, an analysis of the undetected error probability of ensembles
of binary matrices is presented. The ensemble called the Bernoulli ensemble
whose members are considered as matrices generated from i.i.d. Bernoulli source
is mainly considered here. The main contributions of this work are (i)
derivation of the error exponent of the average undetected error probability
and (ii) closed form expressions for the variance of the undetected error
probability. It is shown that the behavior of the exponent for a sparse
ensemble is somewhat different from that for a dense ensemble. Furthermore, as
a byproduct of the proof of the variance formula, simple covariance formula of
the weight distribution is derived.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 02:44:27 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 02:36:53 GMT"
}
] | 2008-04-08T00:00:00 | [
[
"Wadayama",
"Tadashi",
""
]
] |
0705.3996 | Kenichiro Aoki | Kenichiro Aoki and Takahisa Mitsui | A small tabletop experiment for a direct measurement of the speed of
light | 4pages, 5figs | null | 10.1119/1.2919743 | null | physics.ed-ph | null | A small tabletop experiment for a direct measurement of the speed of light to
an accuracy of few percent is described. The experiment is accessible to a wide
spectrum of undergraduate students, in particular to students not majoring in
science or engineering. The experiment may further include a measurement of the
index of refraction of a sample. Details of the setup and equipment are given.
Results and limitations of the experiment are analyzed, partly based on our
experience in employing the experiment in our student laboratories. Safety
considerations are also discussed.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 03:24:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aoki",
"Kenichiro",
""
],
[
"Mitsui",
"Takahisa",
""
]
] |
0705.3997 | Marco Battaglia | Marco Battaglia | The International Linear Collider | 51 pages, to appear in the Proceedings of the Theoretical Advanced
Study Institute in Elementary Particle Physics (TASI), University of
Colorado, Boulder, Colorado, June 4-30, 2006 | null | 10.1142/9789812819260_0002 | null | hep-ex | null | The International Linear Collider (ILC) is the next large scale project in
accelerator particle physics. Colliding electrons with positrons at energies
from 0.3 TeV up to about 1 TeV, the ILC is expected to provide the accuracy
needed to complement the LHC data and extend the sensitivity to new phenomena
at the high energy frontier and answer some of the fundamental questions in
particle physics and in its relation to Cosmology. This paper reviews some
highlights of the ILC physics program and some of the major challenges for the
accelerator and detector design.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:20:18 GMT"
}
] | 2016-11-23T00:00:00 | [
[
"Battaglia",
"Marco",
""
]
] |
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