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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.1098 | Shinya Tomizawa | Shinya Tomizawa, Hideki Ishihara, Masashi Kimura and Ken Matsuno | Supersymmetric Black Rings on Eguchi-Hanson Space | 21 pages | Class.Quant.Grav.24:5609-5626,2007 | 10.1088/0264-9381/24/22/020 | OCU-PHYS 266, AP-GR 42 | hep-th | null | We construct new supersymmetric black ring solutions on the Eguchi-Hanson
base space as solutions of five-dimensional minimal supergravity. The solutions
have the same two angular momentum components and the asymptotic structure on
timeslices is asymptotically locally Euclidean. The S^1-direction of the black
ring is along the equator on a S^2-bolt on the Eguchi-Hanson space. We also
investigate the limit to a black hole, which describes the BMPV black hole with
the topology of the lens space L(2;1)=S^3/Z_2.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 13:54:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tomizawa",
"Shinya",
""
],
[
"Ishihara",
"Hideki",
""
],
[
"Kimura",
"Masashi",
""
],
[
"Matsuno",
"Ken",
""
]
] |
0705.1099 | Stefano Pirandola | Stefano Pirandola, Stefano Mancini, Samuel L. Braunstein, and David
Vitali | Minimal qudit code for a qubit in the phase-damping channel | 9 pages, 3 figures. REVTeX | Phys. Rev. A 77, 032309 (2008) | 10.1103/PhysRevA.77.032309 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the stabilizer formalism we construct the minimal code into a
D-dimensional Hilbert space (qudit) to protect a qubit against phase damping.
The effectiveness of this code is then studied by means of input-output
fidelity.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 13:56:51 GMT"
},
{
"version": "v2",
"created": "Thu, 29 Nov 2007 19:45:57 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Jun 2008 13:27:35 GMT"
}
] | 2008-06-10T00:00:00 | [
[
"Pirandola",
"Stefano",
""
],
[
"Mancini",
"Stefano",
""
],
[
"Braunstein",
"Samuel L.",
""
],
[
"Vitali",
"David",
""
]
] |
0705.1100 | Randall D. Peters | Randall D. Peters | A New Tool for Seismology--the Cumulative Spectral Power | 14 pages, 9 figures | null | null | null | physics.geo-ph | null | The power spectral density (PSD) function is commonly used to specify
seismometer performance. It is derived from the FFT of acceleration and
correction is made for the transfer function of the instrument that generated
the data. As with any such spectrum of density (`per Hz') type, the noise
inherent to a PSD is large. This article illustrates the value of a function
that is derived from the PSD and for which the influence of noise is
significantly reduced. Called the cumulative spectral power (CSP), it is
obtained from the PSD through the noise-reducing process of integration. The
maximum of the CSP (corresponding to the longest graphed value of the period)
provides a means for estimating the total vibrational power of the earth. The
present author has significantly simplified the process of PSD generation. Thus
routine graphing is straightforwared-of first the FFT, followed by the
generation of both a PSD and its associated CSP. The unique properties of the
CSP make it valuable for the study of a variety of earth dynamics. For example,
the strking simplicity of a CSP graph generated from a record containing a
strong teleseismic earthquake is undoubtedly important to the development and
refinement of any viable theory of earthquake dynamics.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 13:57:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Peters",
"Randall D.",
""
]
] |
0705.1101 | Miguel Rodriguez | G. Spavieri (Universidad de Los Andes) and M. Rodriguez (Universidad
de Carabobo) | Photon mass and quantum effects of the Aharonov-Bohm type | 5 pages | Phys. Rev. A, (2007) | 10.1103/PhysRevA.75.052113 | null | quant-ph | null | The magnetic field due to the photon rest mass $m_{ph}$ modifies the standard
results of the Aharonov-Bohm effect for electrons, and of other recent quantum
effects. For the effect involving a coherent superposition of beams of
particles with opposite electromagnetic properties, by means of a table-top
experiment, the limit $m_{ph}x10^{-51}g$ is achievable, improving by 6 orders
of magnitude that derived by Boulware and Deser for the Aharonov-Bohm effect.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 14:29:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Spavieri",
"G.",
"",
"Universidad de Los Andes"
],
[
"Rodriguez",
"M.",
"",
"Universidad\n de Carabobo"
]
] |
0705.1102 | Zhigang Jiang | Z. Jiang, Y. Zhang, H. L. Stormer and P. Kim | The Nature of Quantum Hall States near the Charge Neutral Dirac Point in
Graphene | 4 pages, 4 figures, to appear in Phys. Rev. Lett | Phys. Rev. Lett. 99, 106802 (2007) | 10.1103/PhysRevLett.99.106802 | null | cond-mat.mes-hall | null | We investigate the quantum Hall (QH) states near the charge neutral Dirac
point of a high mobility graphene sample in high magnetic fields. We find that
the QH states at filling factors $\nu=\pm1$ depend only on the perpendicular
component of the field with respect to the graphene plane, indicating them to
be not spin-related. A non-linear magnetic field dependence of the activation
energy gap at filling factor $\nu=1$ suggests a many-body origin. We therefore
propose that the $\nu=0$ and $\pm1$ states arise from the lifting of the spin
and sub-lattice degeneracy of the $n=0$ LL, respectively.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 14:33:17 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jul 2007 18:21:43 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Jiang",
"Z.",
""
],
[
"Zhang",
"Y.",
""
],
[
"Stormer",
"H. L.",
""
],
[
"Kim",
"P.",
""
]
] |
0705.1103 | Mari Carmen Ba\~nuls | Mari-Carmen Ba\~nuls, J. Ignacio Cirac, Michael M. Wolf | Entanglement in fermionic systems | 13 pages, 3 figures, 4 tables | Physical Review A 76, 022311 (2007) | 10.1103/PhysRevA.76.022311 | null | quant-ph | null | The anticommuting properties of fermionic operators, together with the
presence of parity conservation, affect the concept of entanglement in a
composite fermionic system. Hence different points of view can give rise to
different reasonable definitions of separable and entangled states. Here we
analyze these possibilities and the relationship between the different classes
of separable states. We illustrate the differences by providing a complete
characterization of all the sets defined for systems of two fermionic modes.
The results are applied to Gibbs states of infinite chains of fermions whose
interaction corresponds to a XY-Hamiltonian with transverse magnetic field.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:28:22 GMT"
}
] | 2007-09-05T00:00:00 | [
[
"Bañuls",
"Mari-Carmen",
""
],
[
"Cirac",
"J. Ignacio",
""
],
[
"Wolf",
"Michael M.",
""
]
] |
0705.1104 | Jonathan Baugh | J. Baugh, Y. Kitamura, K. Ono and S. Tarucha | Large nuclear Overhauser fields detected in vertically-coupled double
quantum dots | 5 pages, 4 figures, rev-tex. Improved presentation of figures 1-3,
also added SEM image to figure 1. Minor changes to discussion section, and
added a concluding paragraph | Phys. Rev. Lett. 99, 096804 (2007) | 10.1103/PhysRevLett.99.096804 | null | cond-mat.mes-hall quant-ph | null | We report the electrical induction and detection of dynamic nuclear
polarization in the spin-blockade regime of double GaAs vertical quantum dots.
The largest Overhauser field observed was about 4 Tesla, corresponding to a
nuclear polarization of about 40% in the present device. A phenomenological
model is presented to provide a qualitative understanding of our results.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:51:57 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 08:41:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Baugh",
"J.",
""
],
[
"Kitamura",
"Y.",
""
],
[
"Ono",
"K.",
""
],
[
"Tarucha",
"S.",
""
]
] |
0705.1105 | Scott Wolpert | Scott A. Wolpert | Weil-Petersson Metric Geometry Quick Overview | A 3 page handout | null | null | null | math.DG math.MG | null | A quick overview is provided on the current development of the WP metric
geometry.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 14:44:03 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 10:32:53 GMT"
}
] | 2007-07-03T00:00:00 | [
[
"Wolpert",
"Scott A.",
""
]
] |
0705.1106 | Andrzej Derdzinski | Andrzej Derdzinski (Ohio State University), Witold Roter (Wroclaw
University of Technology) | On compact manifolds admitting indefinite metrics with parallel Weyl
tensor | 20 pages | Journal of Geometry and Physics, vol. 58 (2008), no. 9, pp.
1137-1147 | 10.1016/j.geomphys.2008.03.011 | null | math.DG | null | Compact pseudo-Riemannian manifolds that have parallel Weyl tensor without
being conformally flat or locally symmetric are known to exist in infinitely
many dimensions greater than 4. We prove some general topological properties of
such manifolds, namely, vanishing of the Euler characteristic and real
Pontryagin classes, and infiniteness of the fundamental group. We also show
that, in the Lorentzian case, each of them is at least 5-dimensional and admits
a two-fold cover which is a bundle over the circle.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 14:51:11 GMT"
}
] | 2011-06-07T00:00:00 | [
[
"Derdzinski",
"Andrzej",
"",
"Ohio State University"
],
[
"Roter",
"Witold",
"",
"Wroclaw\n University of Technology"
]
] |
0705.1107 | Jakob Yngvason | J.-B. Bru, M. Correggi, P. Pickl, J. Yngvason | The TF Limit for Rapidly Rotating Bose Gases in Anharmonic Traps | null | Commun. Math. Phys. 280, pp 517-544 (2008) | 10.1007/s00220-008-0455-z | null | math-ph cond-mat.other math.MP | null | Starting from the full many body Hamiltonian we derive the leading order
energy and density asymptotics for the ground state of a dilute, rotating Bose
gas in an anharmonic trap in the ` Thomas Fermi' (TF) limit when the
Gross-Pitaevskii coupling parameter and/or the rotation velocity tend to
infinity. Although the many-body wave function is expected to have a
complicated phase, the leading order contribution to the energy can be computed
by minimizing a simple functional of the density alone.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 14:51:30 GMT"
}
] | 2008-06-19T00:00:00 | [
[
"Bru",
"J. -B.",
""
],
[
"Correggi",
"M.",
""
],
[
"Pickl",
"P.",
""
],
[
"Yngvason",
"J.",
""
]
] |
0705.1108 | Yun-Wei Yu | Yun-Wei Yu, Zi-Gao Dai | Shallow decay phase of GRB X-ray afterglows from relativistic wind
bubbles | 5 pages, 4 figures, Accepted for Publication in A&A | Astron.Astrophys.470:119,2007 | 10.1051/0004-6361:20077053 | null | astro-ph | null | The postburst object of a GRB is likely to be a highly magnetized, rapidly
rotating compact object (e.g., a millisecond magnetar), which could produce an
ultrarelativistic electron-positron-pair wind. The interaction of such a wind
with an outwardly expanding fireball ejected during the burst leads to a
relativistic wind bubble (RWB). We numerically calculate the dynamics and
radiative properties of RWBs and use this model to explain the shallow decay
phase of the early X-ray afterglows observed by Swift. We find that RWBs can
fall into two types: forward-shock-dominated and reverse-shock-dominated
bubbles. Their radiation during a period of $\sim 10^{2}-10^{5}$ seconds is
dominated by the shocked medium and the shocked wind, respectively, based on
different magnetic energy fractions of the shocked materials. For both types,
the resulting light curves always have a shallow decay phase. In addition, we
provide an example fit to the X-ray afterglows of GRB 060813 and GRB 060814 and
show that they could be produced by forward-shock-dominated and
reverse-shock-dominated bubbles, respectively. This implies that, for some
early afterglows (e.g., GRB 060814), the long-lasting reverse shock emission is
strong enough to explain their shallow decay phase.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 14:58:23 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Yu",
"Yun-Wei",
""
],
[
"Dai",
"Zi-Gao",
""
]
] |
0705.1109 | Vyacheclav Borisov | V. S. Borisov, M. Mond | On monotonicity, stability, and construction of central schemes for
hyperbolic conservation laws with source terms (Revised Version) | 48 pages, 6 figures. Found inexactitudes are corrected. A second
order scheme based on operator-splitting techniques is constructed | null | null | null | physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The monotonicity and stability of difference schemes for, in general,
hyperbolic systems of conservation laws with source terms are studied. The
basic approach is to investigate the stability and monotonicity of a non-linear
scheme in terms of its corresponding scheme in variations. Such an approach
leads to application of the stability theory for linear equation systems to
establish stability of the corresponding non-linear scheme. The main
methodological innovation is the theorems establishing the notion that a
non-linear scheme is stable (and monotone) if the corresponding scheme in
variations is stable (and, respectively, monotone). Criteria are developed for
monotonicity and stability of difference schemes associated with the numerical
analysis of systems of partial differential equations. The theorem of
Friedrichs (1954) is generalized to be applicable to variational schemes with
non-symmetric matrices. A new modification of the central Lax-Friedrichs (LxF)
scheme is developed to be of the second order accuracy. A monotone piecewise
cubic interpolation is used in the central schemes to give an accurate
approximation for the model in question. The stability and monotonicity of the
modified scheme are investigated. Some versions of the modified scheme are
tested on several conservation laws, and the scheme is found to be accurate and
robust. As applied to hyperbolic conservation laws with, in general, stiff
source terms, it is constructed a second order scheme based on
operator-splitting techniques.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:28:42 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Oct 2007 12:59:17 GMT"
},
{
"version": "v3",
"created": "Wed, 17 Sep 2008 09:33:39 GMT"
},
{
"version": "v4",
"created": "Tue, 4 Nov 2008 16:45:08 GMT"
}
] | 2008-11-04T00:00:00 | [
[
"Borisov",
"V. S.",
""
],
[
"Mond",
"M.",
""
]
] |
0705.1110 | Edgar Graaf de | Edgar de Graaf Joost Kok Walter Kosters | Mining Patterns with a Balanced Interval | null | null | null | null | cs.AI cs.DB | null | In many applications it will be useful to know those patterns that occur with
a balanced interval, e.g., a certain combination of phone numbers are called
almost every Friday or a group of products are sold a lot on Tuesday and
Thursday.
In previous work we proposed a new measure of support (the number of
occurrences of a pattern in a dataset), where we count the number of times a
pattern occurs (nearly) in the middle between two other occurrences. If the
number of non-occurrences between two occurrences of a pattern stays almost the
same then we call the pattern balanced.
It was noticed that some very frequent patterns obviously also occur with a
balanced interval, meaning in every transaction. However more interesting
patterns might occur, e.g., every three transactions. Here we discuss a
solution using standard deviation and average. Furthermore we propose a simpler
approach for pruning patterns with a balanced interval, making estimating the
pruning threshold more intuitive.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:22:38 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kosters",
"Edgar de Graaf Joost Kok Walter",
""
]
] |
0705.1111 | P Ajith | P. Ajith, M. Hewitson, J. R. Smith, H. Grote, S. Hild and K. A. Strain | Physical instrumental vetoes for gravitational-wave burst triggers | Minor changes, To appear in Phys. Rev. D | Phys.Rev.D76:042004,2007 | 10.1103/PhysRevD.76.042004 | AEI-2007-037 | gr-qc | null | We present a robust strategy to \emph{veto} certain classes of instrumental
glitches that appear at the output of interferometric gravitational-wave (GW)
detectors.This veto method is `physical' in the sense that, in order to veto a
burst trigger, we make use of our knowledge of the coupling of different
detector subsystems to the main detector output. The main idea behind this
method is that the noise in an instrumental channel X can be \emph{transferred}
to the detector output (channel H) using the \emph{transfer function} from X to
H, provided the noise coupling is \emph{linear} and the transfer function is
\emph{unique}. If a non-stationarity in channel H is causally related to one in
channel X, the two have to be consistent with the transfer function. We
formulate two methods for testing the consistency between the burst triggers in
channel X and channel H. One method makes use of the \emph{null-stream}
constructed from channel H and the \emph{transferred} channel X, and the second
involves cross-correlating the two. We demonstrate the efficiency of the veto
by `injecting' instrumental glitches in the hardware of the GEO 600 detector.
The \emph{veto safety} is demonstrated by performing GW-like hardware
injections. We also show an example application of this method using 5 days of
data from the fifth science run of GEO 600. The method is found to have very
high veto efficiency with a very low accidental veto rate.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:27:19 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 08:06:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ajith",
"P.",
""
],
[
"Hewitson",
"M.",
""
],
[
"Smith",
"J. R.",
""
],
[
"Grote",
"H.",
""
],
[
"Hild",
"S.",
""
],
[
"Strain",
"K. A.",
""
]
] |
0705.1112 | Lubomir Gavrilov | Lubomir Gavrilov | Cyclicity of period annuli and principalization of Bautin ideals | 14 pages, 1 figure | Ergodic Theory Dynam. Systems 28 (2008), no. 5, 1497--1507. | null | null | math.DS math.CA | null | We prove that the maximal number of limit cycles which bifurcate from an open
period annulus under a given multi-parameter analytic deformation of a given
analytic vector field is the same as in an appropriate one-parameter analytic
deformation of the field, provided that this cyclicity is finite. Along the
same lines we give also a bound of the cyclicity of homoclinic saddle loops.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:20:31 GMT"
},
{
"version": "v2",
"created": "Sat, 10 Nov 2007 18:15:04 GMT"
}
] | 2010-05-04T00:00:00 | [
[
"Gavrilov",
"Lubomir",
""
]
] |
0705.1113 | Stephan Eijt | S.W.H. Eijt, B. Barbiellini, A.J. Houtepen, D. Vanmaekelbergh, P.E.
Mijnarends and A. Bansil | Positron studies of surfaces, structure and electronic properties of
nanocrystals | 6 pages, 5 figures, to appear in Physica Status Solidi (b) - basic
solid state physics, presented at the 14th International Conference of
Positron Annihilation ICPA-14 | Phys. Stat. Sol. (c) 4, 3883 (2007) | 10.1002/pssc.200675753 | null | cond-mat.mtrl-sci | null | A brief review is given of recent positron studies of metal and semiconductor
nanocrystals. The prospects offered by positron annihilation as a sensitive
method to access nanocrystal (NC) properties are described and compared with
other experimental methods. The tunability of the electronic structure of
nanocrystals underlies their great potential for application in many areas.
Owing to their large surface-to-volume ratio, the surfaces and interfaces of
NCs play a crucial role in determining their properties. Here we focus on
positron 2D angular correlation of annihilation radiation (2D-ACAR) and
(two-detector) Doppler studies for investigating surfaces and electronic
properties of CdSe NCs.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:27:56 GMT"
}
] | 2007-10-11T00:00:00 | [
[
"Eijt",
"S. W. H.",
""
],
[
"Barbiellini",
"B.",
""
],
[
"Houtepen",
"A. J.",
""
],
[
"Vanmaekelbergh",
"D.",
""
],
[
"Mijnarends",
"P. E.",
""
],
[
"Bansil",
"A.",
""
]
] |
0705.1114 | Ian Tice | Ian Tice | Lorentz Space Estimates and Jacobian Convergence for the Ginzburg-Landau
Energy with Applied Magnetic Field | 58 pages | null | null | null | math.AP math-ph math.MP | null | In this paper we continue the study of Lorentz space estimates for the
Ginzburg-Landau energy started in our previous paper, \cite{p1}. We focus on
getting estimates for the Ginzburg-Landau energy with external magnetic field
$h_{ex}$ in certain interesting regimes of $h_{ex}$. This allows us to show
that for configurations close to minimizers or local minimizers of the energy,
the vorticity mass of the configuration $(u,A)$ is comparable to the
$L^{2,\infty}$ Lorentz space norm of $\nabla_A u$. We also establish
convergence of the gauge-invariant Jacobians (vorticity measures) in the dual
of a function space defined in terms of Lorentz spaces.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:55:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tice",
"Ian",
""
]
] |
0705.1115 | Barbara M. Terhal | Nikhil Bansal, Sergey Bravyi and Barbara M. Terhal | Classical approximation schemes for the ground-state energy of quantum
and classical Ising spin Hamiltonians on planar graphs | 7 pages; v2 has some small corrections; the presentation in v3 has
been substantially revised. v4 is considerably expanded and includes our
results on quantum Ising spin glasses | Quant. Inf. Comp. Vol. 9, No.8, p. 0701 (2009) | null | null | quant-ph | null | We describe an efficient approximation algorithm for evaluating the
ground-state energy of the classical Ising Hamiltonian with linear terms on an
arbitrary planar graph. The running time of the algorithm grows linearly with
the number of spins and exponentially with 1/epsilon, where epsilon is the
worst-case relative error. This result contrasts the well known fact that exact
computation of the ground-state energy for the two-dimensional Ising spin glass
model is NP-hard. We also present a classical approximation algorithm for the
Local Hamiltonian Problem or Quantum Ising Spin Glass problem on a planar graph
with bounded degree which is known to be a QMA-complete problem. Using a
different technique we find a classical approximation algorithm for the quantum
Ising spin glass problem on the simplest planar graph with unbounded degree,
the star graph.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:38:49 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 17:48:27 GMT"
},
{
"version": "v3",
"created": "Mon, 26 Nov 2007 16:39:01 GMT"
},
{
"version": "v4",
"created": "Tue, 15 Apr 2008 17:52:50 GMT"
}
] | 2009-09-16T00:00:00 | [
[
"Bansal",
"Nikhil",
""
],
[
"Bravyi",
"Sergey",
""
],
[
"Terhal",
"Barbara M.",
""
]
] |
0705.1116 | Lucian M. Ionescu | Lucian M. Ionescu | The Search for a New Equivalence Principle | Essay, 13 pages, AMS LaTeX file | null | null | null | physics.gen-ph | null | The new emerging quantum physics - quantum computing conceptual bridge,
mandates a ``grand unification'' of space-time-matter and quantum information
(all quantized), with deep implications for science in general. The major
physics revolutions in our understanding of the universe are briefly reviewed
and a ``missing'' equivalence principle is identified and its nature explained.
An implementation as an external super-symmetry $\C{E}=ic\C{P}$ is suggested,
generalizing the Wick rotation ``trick''. Taking advantage of the
interpretation of entropy as a measure of symmetry, it is naturally asimilated
within the present Feynman Path Integral algebraic formalism.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:56:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ionescu",
"Lucian M.",
""
]
] |
0705.1117 | Peter Jorgensen | Peter Jorgensen | Quotients of cluster categories | 20 pages | null | null | null | math.RT | null | Higher cluster categories were recently introduced as a generalization of
cluster categories.
This paper shows that in Dynkin types A and D, half of all higher cluster
categories are actually just quotients of cluster categories. The other half
can be obtained as quotients of 2-cluster categories, the "lowest" type of
higher cluster categories.
Hence, in Dynkin types A and D, all higher cluster phenomena are implicit in
cluster categories and 2-cluster categories. In contrast, the same is not true
in Dynkin type E.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:57:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Jorgensen",
"Peter",
""
]
] |
0705.1118 | Yang Liu | Yang Liu, Karin A. Dahmen and A. Berger | Determination of intrinsic switching field distributions in
perpendicular recording media: numerical study of the $\Delta H(M, \Delta M)$
method | 13 pages, 9 figures | Phys. Rev. B 77, 054422 (2008) | 10.1103/PhysRevB.77.054422 | null | cond-mat.dis-nn | null | We present a numerical study of the $\Delta H(M,\Delta M)$ method and its
ability to accurately determine intrinsic switching field distributions in
interacting granular magnetic materials such as perpendicular recording media.
In particular, we study how this methodology fails for large ferromagnetic
inter-granular interactions, at which point the associated strongly correlated
magnetization reversal cannot be properly represented by the mean-field
approximation, upon which the $\Delta H(M,\Delta M)$ method is based. In this
study, we use a 2-dimensional array of symmetric hysterons that have an
intrinsic switching field distribution of standard deviation $\sigma$ and
ferromagnetic nearest-neighbor interactions $J$. We find the $\Delta H(M,\Delta
M)$ method to be very accurate for small $J/\sigma$ values, while substantial
errors develop once the effective exchange field becomes comparable with
$\sigma$, corroborating earlier results from micromagnetic simulations. We
furthermore demonstrate that this failure is correlated with deviations from
data set redundancy, which is a key property of the mean-field approximation.
Thus, the $\Delta H(M,\Delta M)$ method fails in a well defined and
quantifiable manner that can be easily assessed from the data sets alone.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:58:16 GMT"
}
] | 2008-02-23T00:00:00 | [
[
"Liu",
"Yang",
""
],
[
"Dahmen",
"Karin A.",
""
],
[
"Berger",
"A.",
""
]
] |
0705.1119 | Andreas W. Aste | Andreas Aste, Dirk Trautmann | Focusing of high-energy particles in the electrostatic field of a
homogeneously charged sphere and the effective momentum approximation | 16 pages, 9 figures, LATEX, some references added | Eur.Phys.J.A33:11-20,2007 | 10.1140/epja/i2007-10432-4 | null | nucl-th | null | The impact of the strongly attractive electromagnetic field of heavy nuclei
on electrons in quasi-elastic (e,e') scattering is often accounted for by the
effective momentum approximation. This method is a plane wave Born
approximation which takes the twofold effect of the attractive nucleus on
initial and final state electrons into account, namely the modification of the
electron momentum in the vicinity of the nucleus, and the focusing of electrons
towards the nuclear region leading to an enhancement of the corresponding wave
function amplitudes. The focusing effect due to the attractive Coulomb field of
a homogeneously charged sphere on a classical ensemble of charged particles
incident on the field is calculated in the highly relativistic limit and
compared to results obtained from exact solutions of the Dirac equation. The
result is relevant for the theoretical foundation of the effective momentum
approximation and describes the high energy behavior of the amplitude of
continuum Dirac waves in the potential of a homogeneously charged sphere. Our
findings indicate that the effective momentum approximation is a useful
approximation for the calculation of Coulomb corrections in (e,e') scattering
off heavy nuclei for sufficiently high electron energies and momentum transfer.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 15:59:47 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 15:46:14 GMT"
},
{
"version": "v3",
"created": "Sat, 28 Jul 2007 21:37:21 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Aste",
"Andreas",
""
],
[
"Trautmann",
"Dirk",
""
]
] |
0705.1120 | Gaetano Fiore | Gaetano Fiore | Can QFT on Moyal-Weyl spaces look as on commutative ones? | Talk given at the 21st Nishinomiya-Yukawa Memorial Symposium on
Theoretical Physics "Noncommutative Geometry and Spacetime in Physics",
Nishinomiya-Kyoto, Nov. 2006 | Prog. Theor. Phys. Supplement 171 (2007), 54-60 | 10.1143/PTPS.171.54 | Preprint 07-16 Dip. Matematica e Applicazioni, Universit\`a di
Napoli; DSF/12-2007 | hep-th | null | We sketch a natural affirmative answer to the question based on a joint work
[11] with J. Wess. There we argue that a proper enforcement of the "twisted
Poincare'" covariance makes any differences $(x-y)^\mu$ of coordinates of two
copies of the Moyal-Weyl deformation of Minkowski space like undeformed. Then
QFT in an operator approach becomes compatible with (minimally adapted)
Wightman axioms and time-ordered perturbation theory, and physically equivalent
to ordinary QFT, as observables involve only coordinate differences.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:11:31 GMT"
}
] | 2012-09-28T00:00:00 | [
[
"Fiore",
"Gaetano",
""
]
] |
0705.1121 | Robert Fleischer | Robert Fleischer (CERN) | $B_{s,d} \to \pi\pi,\pi K, KK$: Status and Prospects | 28 pages, 10 figures | Eur.Phys.J.C52:267-281,2007 | 10.1140/epjc/s10052-007-0391-7 | CERN-PH-TH/2007-080 | hep-ph hep-ex | null | Several years ago, it was pointed out that the U-spin-related decays
$B_d\to\pi^+\pi^-$, $B_s\to K^+K^-$ and $B_d\to\pi^\mp K^\pm$, $B_s\to \pi^\pm
K^\mp$ offer interesting strategies for the extraction of the angle gamma of
the unitarity triangle. Using the first results from the Tevatron on the $B_s$
decays and the B-factory data on $B_{u,d}$ modes, we compare the determinations
of gamma from both strategies, study the sensitivity on U-spin-breaking
effects, discuss the resolution of discrete ambiguities, predict observables
that were not yet measured but will be accessible at LHCb, explore the
extraction of the width difference $\Delta\Gamma_s$ from untagged $B_s\to
K^+K^-$ rates, and address the impact of new physics. The data for the
$B_d\to\pi^+\pi^-$, $B_s\to K^+K^-$ system favour the BaBar measurement of
direct CP violation in $B_d\to\pi^+\pi^-$, which will be used in the numerical
analysis, and result in a fortunate situation, yielding
$\gamma=(66.6^{+4.3+4.0}_{-5.0-3.0})^\circ$, where the latter errors correspond
to a generous estimate of U-spin-breaking effects. On the other hand, the
$B_d\to\pi^\mp K^\pm$, $B_s\to \pi^\pm K^\mp$ analysis leaves us with
$26^\circ\leq\gamma\leq70^\circ$, and points to a value of the $B_s\to \pi^\pm
K^\mp$ branching ratio that is larger than the current Tevatron result. An
important further step will be the measurement of mixing-induced CP violation
in $B_s\to K^+K^-$, which will also allow us to extract the $B^0_s$--$\bar
B^0_s$ mixing phase unambiguously with the help of $B_s\to J/\psi \phi$ at the
LHC. Finally, the measurement of direct CP violation in $B_s\to K^+K^-$ will
make the full exploitation of the physics potential of the $B_{s,d}\to \pi\pi,
\pi K, KK$ modes possible.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:15:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] |
0705.1122 | Panos Christakoglou | NA49 Collaboration | Rapidity and energy dependence of the electric charge correlations in
A+A collisions at the SPS energies | Submitted in Phys. Rev. C | Phys.Rev.C76:024914,2007 | 10.1103/PhysRevC.76.024914 | null | nucl-ex | null | Results from electric charge correlations studied with the Balance Function
method in A+A collisions from 20\emph{A} to 158\emph{A} GeV are presented in
two different rapidity intervals: In the mid-rapidity region we observe a
decrease of the width of the Balance Function distribution with increasing
centrality of the collision, whereas this effect vanishes in the forward
rapidity region.
Results from the energy dependence study in central Pb+Pb collisions show
that the narrowing of the Balance Function expressed by the normalised width
parameter \textit{W} increases with energy towards the highest SPS and RHIC
energies.
Finally we compare our experimental data points with predictions of several
models. The hadronic string models UrQMD and HIJING do not reproduce the
observed narrowing of the Balance Function. However, AMPT which contains a
quark-parton transport phase before hadronization can reproduce the narrowing
of the BF's width with centrality. This confirms the proposed sensitivity of
the Balance Function analysis to the time of hadronization.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:15:39 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"NA49 Collaboration",
"",
""
]
] |
0705.1123 | Zaili Fang | Z. L. Fang, P. Wu, N. Kundtz, A. M. Chang, X. Y. Liu and J. K. Furdyna | Spin dependent resonant tunneling through 6 micron diameter double
barrier resonant tunneling diode | 3 pages with 3 pictures, submitted to Appl. Phys. Lett | null | 10.1063/1.2751132 | null | cond-mat.mes-hall | null | A vertical resonant tunneling diode (RTD) based on the paramagnetic
Zn1-x-yMnyCdxSe system has been fabricated with a pillar diameter down to ~ 6
micron. The diode exhibits high quality resonant tunneling characteristics
through the electron sub-band of the quantum well at a temperature of 4.2K,
where a clear phonon replica was observable in addition to the primary peak.
Both peaks show a giant Zeeman splitting in an applied magnetic field.
Employing a self-consistent real-time Green's function method, the
current-voltage characteristic was simulated, showing good agreement with the
measured result.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:21:19 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 14:32:34 GMT"
},
{
"version": "v3",
"created": "Thu, 10 May 2007 14:58:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fang",
"Z. L.",
""
],
[
"Wu",
"P.",
""
],
[
"Kundtz",
"N.",
""
],
[
"Chang",
"A. M.",
""
],
[
"Liu",
"X. Y.",
""
],
[
"Furdyna",
"J. K.",
""
]
] |
0705.1124 | Hsiao-Ping Hsu | Hsiao-Ping Hsu, Wolfgang Paul, and Kurt Binder | One- and two-component bottle-brush polymers: simulations compared to
theoretical predictions | 27pages, 33 figures | Macromol. Theory & Simul. 16, 660 (2007) | null | null | cond-mat.soft | null | Scaling predictions and results from self-consistent field calculations for
bottle-brush polymers with a rigid backbone and flexible side chains under good
solvent conditions are summarized and their validity and applicability is
assessed by a comparison with Monte Carlo simulations of a simple lattice
model. It is shown that under typical conditions, as they are also present in
experiments, only a rather weak stretching of the side chains is realized, and
then the scaling predictions based on the extension of the Daoud-Cotton blob
picture are not applicable.
Also two-component bottle brush polymers are considered, where two types
(A,B) of side chains are grafted, assuming that monomers of different kind
repel each other. In this case, variable solvent quality is allowed for, such
that for poor solvent conditions rather dense cylinder-like structures result.
Theories predict ``Janus Cylinder''-type phase separation along the backbone in
this case. The Monte Carlo simulations, using the pruned-enriched Rosenbluth
method (PERM) then are restricted to rather short side chain length.
Nevertheless, evidence is obtained that the phase separation between an A-rich
part of the cylindrical molecule and a B-rich part can only occur locally. The
correlation length of this microphase separation can be controlled by the
solvent quality. This lack of a phase transition is interpreted by an analogy
with models for ferromagnets in one space dimension.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:23:22 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Hsu",
"Hsiao-Ping",
""
],
[
"Paul",
"Wolfgang",
""
],
[
"Binder",
"Kurt",
""
]
] |
0705.1125 | Catherine Brocksopp | Catherine Brocksopp (MSSL), James Miller-Jones (University of
Amsterdam), Rob Fender (University of Southampton), Ben Stappers (Astron) | A highly polarised radio jet during the 1998 outburst of the black hole
transient XTE J1748-288 | Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.11846.x | null | astro-ph | null | XTE J1748-288 is a black hole X-ray transient which went into outburst in
1998 June. The X-ray lightcurves showed canonical morphologies, with minor
variations on the ``Fast Rise Exponential Decay'' profile. The radio source,
however, reached an unusually high flux density of over 600 mJy. This high
radio flux was accompanied by an exceptional (>20%) fractional linear
polarisation, the variability of which was anti-correlated with the flux
density. We use this variability to discuss possible depolarisation mechanisms
and to predict the underlying behaviour of the (unresolved) core/jet
components.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:30:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brocksopp",
"Catherine",
"",
"MSSL"
],
[
"Miller-Jones",
"James",
"",
"University of\n Amsterdam"
],
[
"Fender",
"Rob",
"",
"University of Southampton"
],
[
"Stappers",
"Ben",
"",
"Astron"
]
] |
0705.1126 | Florian Lenz Mr | Florian Lenz, Fotis K. Diakonos, Peter Schmelcher | Scattering Dynamics of Driven Closed Billiards | 12 pages, 4 figures | null | 10.1209/0295-5075/79/20002 | null | nlin.CD | null | We investigate the classical scattering dynamics of the driven elliptical
billiard. Two fundamental scattering mechanisms are identified and employed to
understand the rich behavior of the escape rate. A long-time algebraic decay
which can be tuned by varying the driving amplitude is established. Pulsed
escape rates and decelerated escaping particles are generic properties of the
harmonically breathing billiard. This suggests time-dependent billiards as
prototype systems to study the nonequilibrium evolution of classical ensembles
encountering a multitude of scattering processes off driven targets.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:34:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lenz",
"Florian",
""
],
[
"Diakonos",
"Fotis K.",
""
],
[
"Schmelcher",
"Peter",
""
]
] |
0705.1127 | Tom Girard | TA Girard and S. Figueiredo | Discrepancies in Determinations of the Ginzburg-Landau Parameter | submitted to Phys. Rev. B | null | 10.1103/PhysRevB.76.104513 | null | cond-mat.supr-con | null | Long-standing discrepancies within determinations of the Ginzburg-Landau
parameter $\kappa$ from supercritical field measurements on superconducting
microspheres are reexamined. The discrepancy in tin is shown to result from
differing methods of analyses, whereas the discrepancy in indium is a
consequence of significantly differing experimental results. The reanalyses
however confirms the lower $\kappa$ determinations to within experimental
uncertainties.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:45:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Girard",
"TA",
""
],
[
"Figueiredo",
"S.",
""
]
] |
0705.1128 | Dan A. Lee | Hubert L. Bray and Dan A. Lee | On the Riemannian Penrose inequality in dimensions less than 8 | 21 pages | Duke Math. J. 148, no. 1 (2009), 81-106 | 10.1215/00127094-2009-020 | null | math.DG gr-qc | null | The Positive Mass Theorem states that a complete asymptotically flat manifold
of nonnegative scalar curvature has nonnegative mass. The Riemannian Penrose
inequality provides a sharp lower bound for the mass when black holes are
present. More precisely, this lower bound is given in terms of the area of an
outermost minimal surface, and equality is achieved only for Schwarzschild
metrics. The Riemannian Penrose inequality was first proved in three dimensions
in 1997 by G. Huisken and T. Ilmanen for the case of a single black hole. In
1999, H. Bray extended this result to the general case of multiple black holes
using a different technique. In this paper we extend Bray's technique to
dimensions less than 8.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 16:45:55 GMT"
}
] | 2019-12-19T00:00:00 | [
[
"Bray",
"Hubert L.",
""
],
[
"Lee",
"Dan A.",
""
]
] |
0705.1129 | Hirotada Kobayashi | Hirotada Kobayashi | General Properties of Quantum Zero-Knowledge Proofs | 33 pages | null | null | null | quant-ph | null | This paper studies the complexity classes QZK and HVQZK of problems having a
quantum computational zero-knowledge proof system and an honest-verifier
quantum computational zero-knowledge proof system, respectively. The results
proved in this paper include: (a) HVQZK = QZK, (b) any problem in QZK has a
public-coin quantum computational zero-knowledge proof system, (c) any problem
in QZK has a quantum computational zero-knowledge proof system of perfect
completeness, and (d) any problem in QZK has a three-message public-coin
quantum computational zero-knowledge proof system of perfect completeness with
arbitrarily small constant error in soundness. All the results above are
unconditional and do not rely any computational assumptions. For the classes
QPZK, HVQPZK, and QSZK of problems having a quantum perfect zero-knowledge
proof system, an honest-verifier quantum perfect zero-knowledge proof system,
and a quantum statistical zero-knowledge proof system, respectively, the
following new properties are proved: (e) HVQPZK = QPZK, (f) any problem in QPZK
has a public-coin quantum perfect zero-knowledge proof system, (g) any problem
in QSZK has a quantum statistical zero-knowledge proof system of perfect
completeness, and (h) any problem in QSZK has a three-message public-coin
quantum statistical zero-knowledge proof system of perfect completeness with
arbitrarily small constant error in soundness. It is stressed that our proofs
are direct and do not use complete promise problems or those equivalents. This
gives a unified framework that works well for all of quantum perfect,
statistical, and computational zero-knowledge proofs, and enables us to prove
properties even on the computational and perfect zero-knowledge proofs for
which no complete promise problems are known.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 17:20:45 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kobayashi",
"Hirotada",
""
]
] |
0705.1130 | Andrea Gregori | Andrea Gregori | An Entropy-Weighted Sum over Non-Perturbative Vacua | LaTex, 198 pages, 23 figures. Version 2: added comments and
references, corrected typos and errors | null | null | null | hep-th hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how, in a Universe restricted to the causal region connected to
the observer, General Relativity implies the quantum nature of physical
phenomena and directly leads to a string theory scenario, whose dynamics is
ruled by a functional that weights all configurations according to their
entropy. The most favoured configurations are those of minimal entropy. Along
this class of vacua a four-dimensional space-time is automatically selected;
when, at large volume, a description of space-time in terms of classical
geometry can be recovered, the entropy-weighted sum reduces to the ordinary
Feynman's path integral. What arises is a highly predictive scenario,
phenomenologically compatible with the experimental observations and
measurements, in which everything is determined in terms of the fundamental
constants and the age of the Universe, with no room for freely-adjustable
parameters. We discuss how this leads to the known spectrum of particles and
interactions. Besides the computation of masses and couplings, CKM matrix
elements, cosmological constant, expansion parameters of the Universe etc...,
all resulting, within the degree of the approximation we used, in agreement
with the experimental observations, we also discuss how this scenario passes
the tests provided by cosmology and the constraints imposed by the physics of
the primordial Universe.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:06:52 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Feb 2009 11:40:39 GMT"
}
] | 2009-02-09T00:00:00 | [
[
"Gregori",
"Andrea",
""
]
] |
0705.1131 | Elizabeth Winstanley | Dean Morgan, Stuart Thom, Elizabeth Winstanley and Phil M. Young | Some general properties of the renormalized stress-energy tensor for
static quantum states on (n+1)-dimensional spherically symmetric black holes | 9 pages, no figures, RevTeX4, references added, accepted for
publication in General Relativity and Gravitation | Gen.Rel.Grav.39:1719-1734,2007 | 10.1007/s10714-007-0486-3 | null | gr-qc | null | We study the renormalized stress-energy tensor (RSET) for static quantum
states on (n+1)-dimensional, static, spherically symmetric black holes. By
solving the conservation equations, we are able to write the stress-energy
tensor in terms of a single unknown function of the radial co-ordinate, plus
two arbitrary constants. Conditions for the stress-energy tensor to be regular
at event horizons (including the extremal and ``ultra-extremal'' cases) are
then derived using generalized Kruskal-like co-ordinates. These results should
be useful for future calculations of the RSET for static quantum states on
spherically symmetric black hole geometries in any number of space-time
dimensions.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 17:19:35 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 16:39:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Morgan",
"Dean",
""
],
[
"Thom",
"Stuart",
""
],
[
"Winstanley",
"Elizabeth",
""
],
[
"Young",
"Phil M.",
""
]
] |
0705.1132 | Michael Mortonson | Michael J. Mortonson, Wayne Hu (KICP, UChicago) | Model-independent constraints on reionization from large-scale CMB
polarization | 14 pages, 13 figures; submitted to ApJ | Astrophys.J.672:737-751,2008 | 10.1086/523958 | null | astro-ph | null | On large angular scales, the polarization of the CMB contains information
about the evolution of the average ionization during the epoch of reionization.
Interpretation of the polarization spectrum usually requires the assumption of
a fixed functional form for the evolution, e.g. instantaneous reionization. We
develop a model-independent method where a small set of principal components
completely encapsulate the effects of reionization on the large-angle E-mode
polarization for any reionization history within an adjustable range in
redshift. Using Markov Chain Monte Carlo methods, we apply this approach to
both the 3-year WMAP data and simulated future data. WMAP data constrain two
principal components of the reionization history, approximately corresponding
to the total optical depth and the difference between the contributions to the
optical depth at high and low redshifts. The optical depth is consistent with
the constraint found in previous analyses of WMAP data that assume
instantaneous reionization, with only slightly larger uncertainty due to the
expanded set of models. Using the principal component approach, WMAP data also
place a 95% CL upper limit of 0.08 on the contribution to the optical depth
from redshifts z>20. With improvements in polarization sensitivity and
foreground modeling, approximately five of the principal components can
ultimately be measured. Constraints on the principal components, which probe
the entire reionization history, can test models of reionization, provide
model-independent constraints on the optical depth, and detect signatures of
high-redshift reionization.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 17:26:26 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Mortonson",
"Michael J.",
"",
"KICP, UChicago"
],
[
"Hu",
"Wayne",
"",
"KICP, UChicago"
]
] |
0705.1133 | Haijiang Gong | Haijiang Gong (for the PHENIX Collaboration) | Search for Direct Photons from $\sqrt{s_{NN}}=200GeV$ AuAu Collisions
Using a New $\pi^{0}$ Tagging Method in the PHENIX Experiment at RHIC | 6 pages, 4 figures, Proceedings of Poster Session, 19th International
Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter
2006), November 14-20, 2006, Shanghai, P.R.China | null | null | null | nucl-ex | null | Direct photons provide a insightful tool to study the different stages of a
heavy ion collision, especially the formation of a quark-gluon plasma, without
being influenced by the strong interaction and hadronization processes. The
yield of direct photons can be determined based on the inclusive photon yield
and the background from hadronic decays. We present a new analysis technique
applied to PHENIX Run4 Au+Au dataset. It uses strict particle
identification(PID) in the Electromagnetic Calorimeter(EMCal) and a charged
particle veto to extract a clean photon signal. These photons are then tagged
with EMCal photon candidates with loose PID cuts, which can be reconstructed
with high efficiency, to determine the fraction of photons originating from
$\pi^{0}$ decays. Many systematic uncertainties and detector effects cancel in
this method.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 17:32:12 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gong",
"Haijiang",
"",
"for the PHENIX Collaboration"
]
] |
0705.1134 | Haret Rosu | H.C. Rosu, O. Cornejo-Perez, J.E. Perez-Terrazas | Supersymmetric methods in the traveling variable: inside neurons and at
the brain scale | 14 pages, 1 figure | null | 10.1142/9789812779953_0010 | null | physics.bio-ph | null | We apply the mathematical technique of factorization of differential
operators to two different problems. First we review our results related to the
supersymmetry of the Montroll kinks moving onto the microtubule walls as well
as mentioning the sine-Gordon model for the microtubule nonlinear excitations.
Second, we find analytic expressions for a class of one-parameter solutions of
a sort of diffusion equation of Bessel type that is obtained by supersymmetry
from the homogeneous form of a simple damped wave equations derived in the
works of P.A. Robinson and collaborators for the corticothalamic system. We
also present a possible interpretation of the diffusion equation in the brain
context
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 17:40:38 GMT"
}
] | 2016-11-23T00:00:00 | [
[
"Rosu",
"H. C.",
""
],
[
"Cornejo-Perez",
"O.",
""
],
[
"Perez-Terrazas",
"J. E.",
""
]
] |
0705.1135 | Ryan Porter | R. L. Porter | A He I Case-B Recombination Code | 5 pages, 1 table | null | null | null | astro-ph | null | Recent calculations of collisionless, Case-B, He I emissivities were
performed by Bauman et al. (2005). The source code used in the calculation has
been freely available online since that paper was published. A number of
changes have been made to simplify the use of the code by third parties. Here I
provide details on how to obtain, compile, and execute the program and
interpret the results.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 17:42:15 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Porter",
"R. L.",
""
]
] |
0705.1136 | Gerardo Adesso | Alessio Serafini and Gerardo Adesso | Standard forms and entanglement engineering of multimode Gaussian states
under local operations | 14 pages, 2 figures, IOP style. Published in J. Phys. A, Special
Issue on Quantum Information, Communication, Computation and Cryptography
(the arXiv version has an extra note added) | J. Phys. A: Math. Theor. 40, 8041 (2007) | 10.1088/1751-8113/40/28/S13 | null | quant-ph math.SG physics.optics | null | We investigate the action of local unitary operations on multimode (pure or
mixed) Gaussian states and single out the minimal number of locally invariant
parametres which completely characterise the covariance matrix of such states.
For pure Gaussian states, central resources for continuous-variable quantum
information, we investigate separately the parametre reduction due to the
additional constraint of global purity, and the one following by the
local-unitary freedom. Counting arguments and insights from the phase-space
Schmidt decomposition and in general from the framework of symplectic analysis,
accompany our description of the standard form of pure n-mode Gaussian states.
In particular we clarify why only in pure states with n<=3 modes all the direct
correlations between position and momentum operators can be set to zero by
local unitary operations. For any n, the emerging minimal set of parametres
contains complete information about all forms of entanglement in the
corresponding states. An efficient state engineering scheme (able to encode
direct correlations between position and momentum operators as well) is
proposed to produce entangled multimode Gaussian resources, its number of
optical elements matching the minimal number of locally invariant degrees of
freedom of general pure n-mode Gaussian states. We demonstrate that so-called
"block-diagonal" Gaussian states, without direct correlations between position
and momentum, are systematically less entangled, on average, than arbitrary
pure Gaussian states.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:12:09 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jul 2007 15:42:58 GMT"
}
] | 2007-07-10T00:00:00 | [
[
"Serafini",
"Alessio",
""
],
[
"Adesso",
"Gerardo",
""
]
] |
0705.1137 | Yuri Kornyushin | Yuri Kornyushin | Some problems of low-dimensional physics | Zero boundary conditions model is applied to calculate Fermi and
kinetic energies, and to derive conditions of low-dimensional movement.
Useful for students. Russian version included | Facta Universitatis, Series: Physics, Chemistry and Technology
Vol. 2, No 3, 2001, pp. 35 - 39 | null | null | cond-mat.mtrl-sci cond-mat.stat-mech quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fermi and kinetic energy are usually calculated in periodic boundary
conditions model, which is not self-consistent for low-dimensional problems,
where particles are confined. Thus for confined particles the potential box
model was used self-consistently to calculate Fermi and kinetic energies in 3-,
2-, and 1-dimensional cases. This approach is much more logical and
self-consistent. Then the conditions for neglecting dimensions, that is
conditions under which the movement of particles in the box could be considered
as 2- and 1- dimensional, were derived.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:19:30 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 03:19:42 GMT"
},
{
"version": "v3",
"created": "Thu, 9 Jul 2009 10:58:30 GMT"
},
{
"version": "v4",
"created": "Fri, 10 Dec 2010 20:57:47 GMT"
},
{
"version": "v5",
"created": "Tue, 17 Apr 2012 05:55:24 GMT"
}
] | 2012-04-18T00:00:00 | [
[
"Kornyushin",
"Yuri",
""
]
] |
0705.1138 | Paulina Marian | Paulina Marian and Tudor A. Marian | Bures distance as a measure of entanglement for symmetric two-mode
Gaussian states | published version | Physical Review A 77, 062319 (2008) | 10.1103/PhysRevA.77.062319 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate a Gaussian entanglement measure for a symmetric two-mode Gaussian
state of the quantum electromagnetic field in terms of its Bures distance to
the set of all separable Gaussian states. The required minimization procedure
was considerably simplified by using the remarkable properties of the Uhlmann
fidelity as well as the standard form II of the covariance matrix of a
symmetric state. Our result for the Gaussian degree of entanglement measured by
the Bures distance depends only on the smallest symplectic eigenvalue of the
covariance matrix of the partially transposed density operator. It is thus
consistent to the exact expression of the entanglement of formation for
symmetric two-mode Gaussian states. This non-trivial agreement is specific to
the Bures metric.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:22:41 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 20:37:22 GMT"
},
{
"version": "v3",
"created": "Wed, 18 Jun 2008 12:17:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marian",
"Paulina",
""
],
[
"Marian",
"Tudor A.",
""
]
] |
0705.1139 | Lincoln D. Carr | L. D. Carr and Joachim Brand | Theory of Multidimensional Solitons | review paper, to appear as Chapter 5a in "Emergent Nonlinear
Phenomena in Bose-Einstein Condensates: Theory and Experiment," edited by P.
G. Kevrekidis, D. J. Frantzeskakis, and R. Carretero-Gonzalez
(Springer-Verlag) | Chapter 7 in "Emergent Nonlinear Phenomena in Bose-Einstein
Condensates: Theory and Experiment," edited by P. G. Kevrekidis, D. J.
Frantzeskakis, and R. Carretero-Gonzalez (Springer-Verlag, Berlin, 2009) | 10.1007/978-3-540-73591-5_7 | null | cond-mat.other cond-mat.mes-hall nlin.PS | null | We review a number of topics germane to higher-dimensional solitons in
Bose-Einstein condensates. For dark solitons, we discuss dark band and planar
solitons; ring dark solitons and spherical shell solitons; solitary waves in
restricted geometries; vortex rings and rarefaction pulses; and multi-component
Bose-Einstein condensates. For bright solitons, we discuss instability,
stability, and metastability; bright soliton engineering, including pulsed atom
lasers; solitons in a thermal bath; soliton-soliton interactions; and bright
ring solitons and quantum vortices. A thorough reference list is included.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:28:50 GMT"
}
] | 2010-06-01T00:00:00 | [
[
"Carr",
"L. D.",
""
],
[
"Brand",
"Joachim",
""
]
] |
0705.1140 | Chuong van Tran | Chuong V. Tran | An upper bound for passive scalar diffusion in shear flows | 4 pages, to appear in Phys. Fluids | null | 10.1063/1.2744050 | null | physics.flu-dyn | null | This study is concerned with the diffusion of a passive scalar $\Theta(\r,t)$
advected by general $n$-dimensional shear flows $\u=u(y,z,...,t)\hat{x}$ having
finite mean-square velocity gradients. The unidirectionality of the
incompressible flows conserves the stream-wise scalar gradient,
$\partial_x\Theta$, allowing only the cross-stream components to be amplified
by shearing effects. This amplification is relatively weak because an important
contributing factor, $\partial_x\Theta$, is conserved, effectively rendering a
slow diffusion process. It is found that the decay of the scalar variance
$<\Theta^2>$ satisfies $d<\Theta^2>/dt\ge -C\kappa^{1/3}$, where $C>0$ is a
constant, depending on the fluid velocity gradients and initial distribution of
$\Theta$, and $\kappa$ is the molecular diffusivity. This result generalizes to
axisymmetric flows on the plane and on the sphere having finite mean-square
angular velocity gradients.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:44:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tran",
"Chuong V.",
""
]
] |
0705.1141 | Chandan Joshi Mr. | Chandan Joshi, Lokesh Bharti and S.N.A. Jaaffrey | Enhanced Joule Heating in Umbral Dots | 8 pages, 1 figure, accepted in Solar Physics | null | 10.1007/s11207-007-9052-0 | null | astro-ph | null | We present a study of magnetic profiles of umbral dots (UDs) and its
consequences on the Joule heating mechanisms. Hamedivafa (2003) studied Joule
heating using vertical component of magnetic field. In this paper UDs magnetic
profile has been investigated including the new azimuthal component of magnetic
field which might explain the relatively larger enhancement of Joule heating
causing more brightness near circumference of UD.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:38:44 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 15:26:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Joshi",
"Chandan",
""
],
[
"Bharti",
"Lokesh",
""
],
[
"Jaaffrey",
"S. N. A.",
""
]
] |
0705.1142 | Natalie Frank | Natalie Priebe Frank | A primer on substitution tilings of the Euclidean plane | 26 pages, 39 figures | null | null | null | math.DS math-ph math.HO math.MP | null | This paper is intended to provide an introduction to the theory of
substitution tilings. For our purposes, tiling substitution rules are divided
into two broad classes: geometric and combinatorial. Geometric substitution
tilings include self-similar tilings such as the well-known Penrose tilings;
for this class there is a substantial body of research in the literature.
Combinatorial substitutions are just beginning to be examined, and some of what
we present here is new. We give numerous examples, mention selected major
results, discuss connections between the two classes of substitutions, include
current research perspectives and questions, and provide an extensive
bibliography. Although the author attempts to fairly represent the as a whole,
the paper is not an exhaustive survey, and she apologizes for any important
omissions.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 18:31:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Frank",
"Natalie Priebe",
""
]
] |
0705.1143 | Kouichi Yasui | Kouichi Yasui | Exotic rational elliptic surfaces without 1-handles | 19 pages, 41 figures | Algebr. Geom. Topol. 8 (2008) 971-996 | 10.2140/agt.2008.8.971 | null | math.GT | null | Harer, Kas and Kirby have conjectured that every handle decomposition of the
elliptic surface $E(1)_{2,3}$ requires both 1- and 3-handles. In this article,
we construct a smooth 4-manifold which has the same Seiberg-Witten invariant as
$E(1)_{2,3}$ and admits neither 1- nor 3-handles, by using rational blow-downs
and Kirby calculus. Our manifold gives the first example of either a
counterexample to the Harer-Kas-Kirby conjecture or a homeomorphic but
non-diffeomorphic pair of simply connected closed smooth 4-manifolds with the
same non-vanishing Seiberg-Witten invariants.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:00:43 GMT"
}
] | 2016-01-20T00:00:00 | [
[
"Yasui",
"Kouichi",
""
]
] |
0705.1144 | Morgan Le Delliou | Morgan Le Delliou (IFT, CFTC) | Merger as Intermittent Accretion | letter accepted by A&A 29/09/08, 4 pages, colour figures | Astron.Astrophys.490:L43-L48,2008 | 10.1051/0004-6361:200810819 | DF-IFT/UAM-08-13 | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Self-Similar Secondary Infall Model (SSIM) is modified to simulate a
merger event. The model encompass spherical versions of tidal stripping and
dynamical friction that agrees with the Syer & White merger paradigm's
behaviour. The SSIM shows robustness in absorbing even comparable mass
perturbations and returning to its original state. It suggests the approach to
be invertible and allows to consider accretion as smooth mass inflow merging
and mergers as intermittent mass inflow accretion.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:01:13 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Aug 2008 13:44:36 GMT"
},
{
"version": "v3",
"created": "Fri, 12 Sep 2008 14:55:32 GMT"
},
{
"version": "v4",
"created": "Wed, 1 Oct 2008 05:15:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Delliou",
"Morgan Le",
"",
"IFT, CFTC"
]
] |
0705.1145 | Masataka Ando | Masataka Ando, Kouji Ohta, Ikuru Iwata, Masayuki Akiyama, Kentaro
Aoki, and Naoyuki Tamura | Lyman Break Galaxies at z~5: Rest-frame UV Spectra II | 17 pages, 5 figures, accepted for publication in PASJ | null | 10.1093/pasj/59.4.717 | null | astro-ph | null | We present the results of spectroscopy of Lyman Break Galaxies (LBGs) at z~5
in the J0053+1234 field with the Faint Object Camera and Spectrograph on the
Subaru telescope. Among 5 bright candidates with z' < 25.0 mag, 2 objects are
confirmed to be at z~5 from their Ly alpha emission and the continuum
depression shortward of Ly alpha. The EWs of Ly alpha emission of the 2 LBGs
are not so strong to be detected as Ly alpha emitters, and one of them shows
strong low-ionized interstellar (LIS) metal absorption lines. Two faint objects
with z' \geq 25.0 mag are also confirmed to be at z~5, and their spectra show
strong Ly alpha emission in contrast to the bright ones. These results suggest
a deficiency of strong Ly alpha emission in bright LBGs at z~5, which has been
discussed in our previous paper. Combined with our previous spectra of LBGs at
z~5 obtained around the Hubble Deep Field-North (HDF-N), we made a composite
spectrum of UV luminous (M_1400 \leq -21.5 mag) LBGs at z~5. The resultant
spectrum shows a weak Ly alpha emission and strong LIS absorptions which
suggests that the bright LBGs at z~5 have chemically evolved at least to ~0.1
solar metallicity. For a part of our sample in the HDF-N region, we obtained
near-to-mid infrared data, which constraint stellar masses of these objects.
With the stellar mass and the metallicity estimated from LIS absorptions, the
metallicities of the LBGs at z~5 tend to be lower than those of the galaxies
with the same stellar mass at z \lesssim 2, although the uncertainty is very
large.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:03:26 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ando",
"Masataka",
""
],
[
"Ohta",
"Kouji",
""
],
[
"Iwata",
"Ikuru",
""
],
[
"Akiyama",
"Masayuki",
""
],
[
"Aoki",
"Kentaro",
""
],
[
"Tamura",
"Naoyuki",
""
]
] |
0705.1146 | Eugen Radu | Eugen Radu and D. H. Tchrakian | Goldstone models in D+1 dimensions, D=3,4,5, supporting stable and zero
topological charge solutions | 29 pages, 6 figures | null | 10.1088/1751-8113/40/33/013 | DIAS-STP-07-06 | hep-th | null | We study finite energy static solutions to a global symmetry breaking
Goldstone model described by an isovector scalar field in D+1 spacetime
dimensions. Both topologically stable multisolitons with arbitrary winding
numbers, and zero topological charge soliton--antisoliton solutions are
constructed numerically in D=3,4,5. We have explored the types of symmetries
the systems should be subjected to, for there to exist multisoliton and
soliton--antisoliton pairs in D=3,4,5,6. These findings are underpinned by
constructing numerical solutions in the $D\le 5$ examples. Subject to axial
symmetry, only multisolitons of all topological charges exist in even D, and in
odd D, only zero and unit topological charge solutions exist. Subjecting the
system to weaker than axial symmetries, results in the existence of all the
possibilities in all dimensions. Our findings apply also to finite 'energy'
solutions to Yang--Mills and Yang-Mills--Higgs systems, and in principle also
sigma models.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:09:30 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 13:51:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Radu",
"Eugen",
""
],
[
"Tchrakian",
"D. H.",
""
]
] |
0705.1147 | Abhijit Majumder | A. Majumder and B. M\"uller | Higher twist jet broadening and classical propagation | 17 pages, 6 figures, revtex4, references added, typos corrected,
discussion updated | Phys.Rev.C77:054903,2008 | 10.1103/PhysRevC.77.054903 | null | nucl-th hep-ph | null | The transverse broadening of jets produced in deep-inelastic scattering (DIS)
off a large nucleus is studied in the collinear limit. A class of medium
enhanced higher twist corrections are re-summed to calculate the transverse
momentum distribution of the produced collinear jet. In contrast to previous
approaches, resummation of the leading length enhanced higher twist corrections
is shown to lead to a two dimensional diffusion equation for the transverse
momentum of the propagating jet. Results for the average transverse momentum
obtained from this approach are then compared to the broadening expected from a
classical Langevin analysis for the propagation of the jet under the action of
the fluctuating color Lorentz force inside the nucleons. The set of
approximations that lead to identical results from the two approaches are
outlined. The relationship between the momentum diffusion constant $D$ and the
transport coefficient $\hat{q}$ is explicitly derived.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:09:55 GMT"
},
{
"version": "v2",
"created": "Tue, 8 May 2007 23:09:12 GMT"
},
{
"version": "v3",
"created": "Mon, 11 Jun 2007 18:34:28 GMT"
},
{
"version": "v4",
"created": "Mon, 25 Feb 2008 16:02:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Majumder",
"A.",
""
],
[
"Müller",
"B.",
""
]
] |
0705.1148 | Damien Chablat | Damien Chablat (IRCCyN), Philippe Wenger (IRCCyN) | S\'eparation des Solutions aux Mod\`eles G\'eom\'etriques Direct et
Inverse pour les Manipulateurs Pleinement Parall\`eles | null | Journal of Mechanism and Machine Theory 36, 6 (2001) 763-783 | null | null | cs.RO | null | This article provides a formalism making it possible to manage the solutions
of the direct and inverse kinematic models of the fully parallel manipulators.
We introduce the concept of working modes to separate the solutions from the
opposite geometrical model. Then, we define, for each working mode, the aspects
of these manipulators. To separate the solutions from the direct kinematics
model, we introduce the concept of characteristic surfaces. Then, we define the
uniqueness domains, as being the greatest domains of the workspace in which
there is unicity of solutions. The principal applications of this work are the
design, the trajectory planning.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:10:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chablat",
"Damien",
"",
"IRCCyN"
],
[
"Wenger",
"Philippe",
"",
"IRCCyN"
]
] |
0705.1149 | Simon Gr\"oblacher | Simon Groeblacher, Sylvain Gigan, Hannes R. Boehm, Anton Zeilinger,
Markus Aspelmeyer | Radiation-pressure self-cooling of a micromirror in a cryogenic
environment | null | Europhys. Lett. 81, 54003 (2008) | 10.1209/0295-5075/81/54003 | null | quant-ph cond-mat.mtrl-sci | null | We demonstrate radiation-pressure cavity-cooling of a mechanical mode of a
micromirror starting from cryogenic temperatures. To achieve that, a
high-finesse Fabry-Perot cavity (F\approx 2200) was actively stabilized inside
a continuous-flow 4He cryostat. We observed optical cooling of the fundamental
mode of a 50mu x 50 mu x 5.4 mu singly-clamped micromirror at \omega_m=3.5 MHz
from 35 K to approx. 290 mK. This corresponds to a thermal occupation factor of
<n>\approx 1x10^4. The cooling performance is only limited by the mechanical
quality and by the optical finesse of the system. Heating effects, e.g. due to
absorption of photons in the micromirror, could not be observed. These results
represent a next step towards cavity-cooling a mechanical oscillator into its
quantum ground state.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:10:41 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 13:25:53 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Groeblacher",
"Simon",
""
],
[
"Gigan",
"Sylvain",
""
],
[
"Boehm",
"Hannes R.",
""
],
[
"Zeilinger",
"Anton",
""
],
[
"Aspelmeyer",
"Markus",
""
]
] |
0705.1150 | Damien Chablat | Damien Chablat (IRCCyN), Jorge Angeles (CIM) | On the Kinetostatic Optimization of Revolute-Coupled Planar Manipulators | null | Journal of Mechanism and Machine Theory (2002) 351-374 | null | null | cs.RO | null | Proposed in this paper is a kinetostatic performance index for the optimum
dimensioning of planar manipulators of the serial type. The index is based on
the concept of distance of the underlying Jacobian matrix to a given isotropic
matrix that is used as a reference model for purposes of performance
evaluation. Applications of the index fall in the realm of design, but control
applications are outlined. The paper focuses on planar manipulators, the basic
concepts being currently extended to their three-dimensional counterparts.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:11:12 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chablat",
"Damien",
"",
"IRCCyN"
],
[
"Angeles",
"Jorge",
"",
"CIM"
]
] |
0705.1151 | Mustafa Cenk Gursoy | Junwei Zhang, Mustafa Cenk Gursoy | Achievable Rates and Optimal Resource Allocation for Imperfectly-Known
Fading Relay Channels | null | null | null | null | cs.IT math.IT | null | In this paper, achievable rates of imperfectly-known fading relay channels
are studied. It is assumed that communication starts with the network training
phase in which the receivers estimate the fading coefficients of their
respective channels. In the data transmission phase, amplify-and-forward and
decode-and-forward relaying schemes are considered, and the corresponding
achievable rate expressions are obtained. The achievable rate expressions are
then employed to identify the optimal resource allocation strategies.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:21:40 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Zhang",
"Junwei",
""
],
[
"Gursoy",
"Mustafa Cenk",
""
]
] |
0705.1152 | Jorge Alberto Guccione | Graciela Carboni, Jorge A. Guccione and Juan J. Guccione | The cyclic homology of monogenic extensions in the noncommutative
setting | 22 pages | null | null | null | math.KT | null | We study the Hochschild and cyclic homologies of noncommutative monogenic
extensions. As an aplication we compute the Hochschild and cyclic homologies of
the rank~1 Hopf algebras introduced by L. Krop and D. Radford in [Finite
dimensional Hopf algebras of rank 1 in characteristic 0, Journal of Algebra
302, no. 1, 214-230} (2006)].
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:27:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Carboni",
"Graciela",
""
],
[
"Guccione",
"Jorge A.",
""
],
[
"Guccione",
"Juan J.",
""
]
] |
0705.1153 | Kevin Krisciunas | Kevin Krisciunas, Dylan R. Semler, Joseph Richards, Hugo E. Schwarz,
Nicholas B. Suntzeff, Sergio Vera, and Pedro Sanhueza | Optical Sky Brightness at Cerro Tololo Inter-American Observatory from
1992 to 2006 | 24 pages, 5 figures, to be published in the June, 2007, issue of the
Publications of the Astron. Society of the Pacific | null | 10.1086/519564 | null | astro-ph | null | We present optical UBVRI sky brightness measures from 1992 through 2006. The
data are based on CCD imagery obtained with the CTIO 0.9-m, 1.3-m, and 1.5-m
telescopes. The B- and V-band data are in reasonable agreement with
measurements previously made at Mauna Kea, though on the basis of a small
number of images per year there are discrepancies for the years 1992 through
1994. Our CCD-based data are not significantly different than values obtained
at Cerro Paranal. We find that the yearly averages of V-band sky brightness are
best correlated with the 10.7-cm solar flux taken 5 days prior to the sky
brightness measures. This implies an average speed of 350 km/sec for the solar
wind. While we can measure an enhancement of the night sky levels over La
Serena 10 degrees above the horizon, at elevation angles above 45 degrees we
find no evidence that the night sky brightness at Cerro Tololo is affected by
artificial light of nearby towns and cities.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:28:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Krisciunas",
"Kevin",
""
],
[
"Semler",
"Dylan R.",
""
],
[
"Richards",
"Joseph",
""
],
[
"Schwarz",
"Hugo E.",
""
],
[
"Suntzeff",
"Nicholas B.",
""
],
[
"Vera",
"Sergio",
""
],
[
"Sanhueza",
"Pedro",
""
]
] |
0705.1154 | Mehrdad Adibzadeh | Mehrdad Adibzadeh and P. Q. Hung | Quark-lepton mass unification at TeV scales | Accepted for publication in PRD: The new version is in agreement with
the accepted manuscript | Phys.Rev.D76:085002,2007 | 10.1103/PhysRevD.76.085002 | null | hep-ph | null | A scenario combining a model of early (TeV) unification of quarks and leptons
with the physics of large extra dimensions provides a natural mechanism linking
quark and lepton masses at TeV scale. This has been dubbed as early
quark-lepton mass unification by one of us (PQH) in one of the two models of
early quark-lepton unification, which are consistent with data, namely SU(4)_PS
\otimes SU(2)_L \otimes SU(2)_R \otimes SU(2)_H. In particular, it focused on
the issue of naturally light Dirac neutrino. The present paper will focus on
similar issues in the other model, namely SU(4)_PS \otimes SU(3)_L \otimes
SU(3)_H.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:33:54 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 15:48:02 GMT"
},
{
"version": "v3",
"created": "Wed, 15 Aug 2007 18:48:26 GMT"
}
] | 2009-04-16T00:00:00 | [
[
"Adibzadeh",
"Mehrdad",
""
],
[
"Hung",
"P. Q.",
""
]
] |
0705.1155 | Kerry Soileau | Kerry M. Soileau | State Vector Determination By A Single Tracking Satellite | null | null | null | null | astro-ph | http://creativecommons.org/licenses/by/4.0/ | Using only a single tracking satellite capable of only range measurements to
an orbiting object in an unknown Keplerian orbit, it is theoretically possible
to calculate the orbit and a current state vector. In this paper we derive an
algorithm that can perform this calculation.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:35:37 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Aug 2022 14:22:37 GMT"
}
] | 2022-08-29T00:00:00 | [
[
"Soileau",
"Kerry M.",
""
]
] |
0705.1156 | Michele Campisi | M. Campisi, D. Accoto, F. Damiani, P. Dario | A soft-lithographed chaotic electrokinetic micromixer for efficient
chemical reactions in lab-on-chips | 8 pages, 6 fihures | Journal of Micro-Nano Mechatronics 5, 69 (2010) | 10.1007/s12213-010-0024-3 | null | cond-mat.soft | null | Mixing is one of the basic functions which automated lab-on-chips require for
the effective management of liquid samples. In this paper we report on the
working principle, design, fabrication and experimental characterization of a
soft-lithographed micromixer for microfluidic applications. The device
effectively mixes two liquids by means of chaotic advection obtained as an
implementation of a Linked Twisted Map (LTM). In this sense it is chaotic. The
liquids are electrokinetically displaced by generating rolls through AC
electroosmosis on co-planar electrodes. The device performance has been tested
on dyed DI-water for several voltages, frequencies and flow-rates, displaying
good mixing properties in the range of $10 \div 100$kHz, at low peak-to-peak
voltages ($\sim15 \div 20$ volts). Low voltage supply, small dimensions and
possibility of fabrication via standard lithographic techniques make the device
highly integrable in lab-on-a-chip platforms.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:37:04 GMT"
}
] | 2010-12-14T00:00:00 | [
[
"Campisi",
"M.",
""
],
[
"Accoto",
"D.",
""
],
[
"Damiani",
"F.",
""
],
[
"Dario",
"P.",
""
]
] |
0705.1157 | Hyun Min Lee | Hyun Min Lee and Antonios Papazoglou | Gravitino in six-dimensional warped supergravity | 24 pages, no figures, matches version in Nucl. Phys. B | Nucl.Phys.B792:166-186,2008 | 10.1016/j.nuclphysb.2007.09.024 | null | hep-th | null | We consider the gravitino spectrum for the general warped solution in a
specific six-dimensional gauged supergravity. We find that although the brane
tensions introduced at the conical singularities break the bulk supersymmetry
explicitly, massless modes of gravitino can exist with a nontrivial wave
function profile, due to a nonzero U(1)_R gauge flux. We also compute the wave
function and the mass spectrum of Kaluza-Klein massive modes of the gravitino
explicitly. We show that the introduction of a gravitino mass term on a
regularized brane can give a suppressed effective gravitino mass compared to
the compactification scale, due to the delocalization of the wave function of
the zero-mode gravitino.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 19:41:45 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 18:00:07 GMT"
},
{
"version": "v3",
"created": "Mon, 22 Oct 2007 18:14:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lee",
"Hyun Min",
""
],
[
"Papazoglou",
"Antonios",
""
]
] |
0705.1158 | Ignacy Sawicki | Wayne Hu, Ignacy Sawicki (KICP, U. Chicago) | Models of f(R) Cosmic Acceleration that Evade Solar-System Tests | 13 pages, 10 figures. Submitted to Phys. Rev. D | Phys.Rev.D76:064004,2007 | 10.1103/PhysRevD.76.064004 | null | astro-ph gr-qc hep-th | null | We study a class of metric-variation f(R) models that accelerates the
expansion without a cosmological constant and satisfies both cosmological and
solar-system tests in the small-field limit of the parameter space.
Solar-system tests alone place only weak bounds on these models, since the
additional scalar degree of freedom is locked to the high-curvature
general-relativistic prediction across more than 25 orders of magnitude in
density, out through the solar corona. This agreement requires that the
galactic halo be of sufficient extent to maintain the galaxy at high curvature
in the presence of the low-curvature cosmological background. If the galactic
halo and local environment in f(R) models do not have substantially deeper
potentials than expected in LCDM, then cosmological field amplitudes |f_R| >
10^{-6} will cause the galactic interior to evolve to low curvature during the
acceleration epoch. Viability of large-deviation models therefore rests on the
structure and evolution of the galactic halo, requiring cosmological
simulations of f(R) models, and not directly on solar-system tests. Even small
deviations that conservatively satisfy both galactic and solar-system
constraints can still be tested by future, percent-level measurements of the
linear power spectrum, while they remain undetectable to cosmological-distance
measures. Although we illustrate these effects in a specific class of models,
the requirements on f(R) are phrased in a nearly model-independent manner.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 23:45:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hu",
"Wayne",
"",
"KICP, U. Chicago"
],
[
"Sawicki",
"Ignacy",
"",
"KICP, U. Chicago"
]
] |
0705.1159 | Andrew Eckford | Andrew W. Eckford | Ordering Finite-State Markov Channels by Mutual Information | 5 pages, no figures. To be presented at the 2007 IEEE International
Symposium on Information Theory, Nice, France, June 2007 | null | null | null | cs.IT math.IT | null | In previous work, an ordering result was given for the symbolwise probability
of error using general Markov channels, under iterative decoding of LDPC codes.
In this paper, the ordering result is extended to mutual information, under the
assumption of an iid input distribution. For certain channels, in which the
capacity-achieving input distribution is iid, this allows ordering of the
channels by capacity. The complexity of analyzing general Markov channels is
mitigated by this ordering, since it is possible to immediately determine that
a wide class of channels, with different numbers of states, has a smaller
mutual information than a given channel.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:48:18 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Eckford",
"Andrew W.",
""
]
] |
0705.1160 | Andrei Linde | Andrei Linde | Towards a gauge invariant volume-weighted probability measure for
eternal inflation | 16 pages, 3 figs, few misprints corrected, comments added | JCAP 0706:017,2007 | 10.1088/1475-7516/2007/06/017 | null | hep-th astro-ph gr-qc hep-ph | null | An improved volume-weighted probability measure for eternal inflation is
proposed. For the models studied in this paper it leads to simple and
intuitively expected gauge-invariant results.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:06:30 GMT"
},
{
"version": "v2",
"created": "Sun, 20 May 2007 20:49:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Linde",
"Andrei",
""
]
] |
0705.1161 | Lillian Lee | Lillian Lee | IDF revisited: A simple new derivation within the Robertson-Sp\"arck
Jones probabilistic model | To appear, Proceedings of SIGIR 2007, poster paper (2 pages) | null | null | null | cs.IR cs.CL | null | There have been a number of prior attempts to theoretically justify the
effectiveness of the inverse document frequency (IDF). Those that take as their
starting point Robertson and Sparck Jones's probabilistic model are based on
strong or complex assumptions. We show that a more intuitively plausible
assumption suffices. Moreover, the new assumption, while conceptually very
simple, provides a solution to an estimation problem that had been deemed
intractable by Robertson and Walker (1997).
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:08:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lee",
"Lillian",
""
]
] |
0705.1162 | Mauricio Romo | Rodrigo Aros, Mauricio Romo and Nelson Zamorano | Compactification in first order gravity | Minor corrections | J.Phys.Conf.Ser.134:012013,2008 | 10.1088/1742-6596/134/1/012013 | null | hep-th | null | The Kaluza-Klein compactification process is applied in five dimensions to CS
gravity, for the anti-de Sitter and Poincar\'e groups, using the first order
formalism. In this context some solutions are found and analyzed. Also, the
conserved charges associated to the solutions are computed.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:10:25 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Jun 2007 17:34:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aros",
"Rodrigo",
""
],
[
"Romo",
"Mauricio",
""
],
[
"Zamorano",
"Nelson",
""
]
] |
0705.1163 | Andrew Janca | Andrew J. Janca | Spinning straight cosmic strings with flat exterior solutions
generically violate the weak energy condition | 2 pages, 1 figure | null | null | null | gr-qc | null | Any interior solution for a cylindrically symmetric, stationary cosmic string
with flat exterior, spinning around its longitudinal axis, and without internal
longitudinal currents ($g_{zz}=1$, $g_{tz}=0$), must somewhere violate the weak
energy condition of standard general relativity. Existing interior solutions
may be readily fixed by adding mass to the string above that generating its
angular deficit, but at the cost of introducing an exterior gravitational
field.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:48:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Janca",
"Andrew J.",
""
]
] |
0705.1164 | Thomas A. Ivey | Thomas Ivey, Stephane Lafortune | Spectral stability of periodic NLS and CGL solutions | 26 pages, 12 figures | null | null | null | nlin.SI | null | We consider periodic traveling wave solutions to the focusing nonlinear
Schrodinger equation (NLS) that have been shown to persist when the NLS is
perturbed to the complex Ginzburg-Landau equation (CGL). In particular, we show
that these periodic traveling waves are spectrally stable solutions of NLS with
respect to periodic perturbations. Furthermore, we use an argument based on the
Fredholm alternative to find an instability criterion for the persisting
solutions to CGL.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:19:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ivey",
"Thomas",
""
],
[
"Lafortune",
"Stephane",
""
]
] |
0705.1165 | Monique Aller | M.C. Aller and D.O. Richstone | Host Galaxy Bulge Predictors of Supermassive Black Hole Mass | accepted for publication in ApJ | null | 10.1086/519298 | null | astro-ph | null | A variety of host galaxy (bulge) parameters are examined in order to
determine their predictive power in ascertaining the masses of the supermassive
black holes (SMBH) at the centers of the galaxies. Based on a sample of 23
nearby galaxies, comprised of both elliptical galaxies and spiral/lenticular
bulges, we identify a strong correlation between the bulge gravitational
binding energy ($E_g$), as traced by the stellar light profile, and the SMBH
mass ($M_{\bullet}$), such that $M_{\bullet} \propto E_g^{0.6}$. The scatter
about the relationship indicates that this is as strong a predictor of
$M_{\bullet}$ as the velocity dispersion ($\sigma$), for the elliptical galaxy
subsample. Improved mass-to-light ratios, obtained with IFU spectroscopy and
I-band photometry by the SAURON group, were used for those sample galaxies
where available, resulting in an energy predictor with the same slope, but with
reduced scatter. Alternative $M_{\bullet}$ predictors such as the gravitational
potential and the bulge mass are also explored, but these are found to be
inferior when compared with both the bulge gravitational binding energy and
bulge velocity dispersion predictors, for the full galaxy sample.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:14:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aller",
"M. C.",
""
],
[
"Richstone",
"D. O.",
""
]
] |
0705.1166 | Paolo Amore Dr | Paolo Amore | A new approach to resummation: Parametric Perturbation Theory | 4 pages, 3 figures, 3 tables | null | null | null | cond-mat.other hep-ph hep-th nucl-th | null | We present a {\sl non--perturbative} method, called {\sl Parametric
Perturbation Theory} (PPT), which is alternative to the ordinary perturbation
theory. The method relies on a principle of simplicity for the observable
solutions, which are constrained to be linear in a certain (unphysical)
parameter. The perturbative expansion is carried out in this parameter and not
in the physical coupling (as in ordinary perturbation theory). We show that the
method is capable to resum the divergent perturbative series, to {\sl extract}
the leading asymptotic (strong coupling) behavior and {\sl predict} with high
accuracy the coefficients of the perturbative series.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:16:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Amore",
"Paolo",
""
]
] |
0705.1167 | Cristian Armendariz-Picon | C. Armendariz-Picon | Creating Statistically Anisotropic and Inhomogeneous Perturbations | 20 pages, 1 figure. Uses RevTeX4 | JCAP 0709:014,2007 | 10.1088/1475-7516/2007/09/014 | null | astro-ph | null | In almost all structure formation models, primordial perturbations are
created within a homogeneous and isotropic universe, like the one we observe.
Because their ensemble averages inherit the symmetries of the spacetime in
which they are seeded, cosmological perturbations then happen to be
statistically isotropic and homogeneous. Certain anomalies in the cosmic
microwave background on the other hand suggest that perturbations do not
satisfy these statistical properties, thereby challenging perhaps our
understanding of structure formation. In this article we relax this tension. We
show that if the universe contains an appropriate triad of scalar fields with
spatially constant but non-zero gradients, it is possible to generate
statistically anisotropic and inhomogeneous primordial perturbations, even
though the energy momentum tensor of the triad itself is invariant under
translations and rotations.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:17:25 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Armendariz-Picon",
"C.",
""
]
] |
0705.1168 | Paolo Amore Dr | Paolo Amore | Going beyond perturbation theory: Parametric Perturbation Theory | 20 pages, 12 figures, 7 tables | null | null | null | hep-ph cond-mat.other hep-th nucl-th | null | We devise a {\sl non--perturbative} method, called {\sl Parametric
Perturbation Theory} (PPT), which is alternative to the ordinary perturbation
theory. The method relies on a principle of simplicity for the observable
solutions, which are constrained to be linear in a certain (unphysical)
parameter. The perturbative expansion is carried out in this parameter and not
in the physical coupling (as in ordinary perturbation theory). We provide a
number of nontrivial examples, where our method is capable to resum the
divergent perturbative series, {\sl extract} the leading asymptotic (strong
coupling) behavior and {\sl predict} with high accuracy the coefficients of the
perturbative series. In the case of a zero dimensional field theory we prove
that PPT can be used to provide the imaginary part of the solution, when the
problem is analytically continued to negative couplings. In the case of a
$\phi^4$ lattice model 1+1 and of elastic theory we have shown that the
observables resummed with PPT display a branch point at a finite value of the
coupling, signaling the transition from a stable to a metastable state. We have
also applied the method to the prediction of the virial coefficients for a hard
sphere gas in two and three dimensions; in this example we have also found that
the solution resummed with PPT has a singularity at finite density. Predictions
for the unknown virial coefficients are made.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:22:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Amore",
"Paolo",
""
]
] |
0705.1169 | Hung The Diep | V. Thanh Ngo and H. T. Diep | Frustration Effects in Antiferromagnetic FCC Heisenberg Films | 11 pages, 19 figures, submitted to J. Phys.: Condensed Matter | null | 10.1088/0953-8984/19/38/386202 | null | cond-mat.mtrl-sci | null | We study the effects of frustration in an antiferromagnetic film of FCC
lattice with Heisenberg spin model including an Ising-like anisotropy. Monte
Carlo (MC) simulations have been used to study thermodynamic properties of the
film. We show that the presence of the surface reduces the ground state (GS)
degeneracy found in the bulk. The GS is shown to depend on the surface in-plane
interaction $J_s$ with a critical value at which ordering of type I coexists
with ordering of type II. Near this value a reentrant phase is found. Various
physical quantities such as layer magnetizations and layer susceptibilities are
shown and discussed. The nature of the phase transition is also studied by
histogram technique. We have also used the Green's function (GF) method for the
quantum counterpart model. The results at low-$T$ show interesting effects of
quantum fluctuations. Results obtained by the GF method at high $T$ are
compared to those of MC simulations. A good agreement is observed.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:26:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ngo",
"V. Thanh",
""
],
[
"Diep",
"H. T.",
""
]
] |
0705.1170 | Thomas Cox J | T.J. Cox, Abraham Loeb (Harvard/CfA) | The Collision Between The Milky Way And Andromeda | accepted to MNRAS | null | 10.1111/j.1365-2966.2008.13048.x | null | astro-ph | null | We use a N--body/hydrodynamic simulation to forecast the future encounter
between the Milky Way and the Andromeda galaxies, given current observational
constraints on their relative distance, relative velocity, and masses. Allowing
for a comparable amount of diffuse mass to fill the volume of the Local Group,
we find that the two galaxies are likely to collide in a few billion years -
within the Sun's lifetime. During the the interaction, there is a chance that
the Sun will be pulled away from its present orbital radius and reside in an
extended tidal tail. The likelihood for this outcome increases as the merger
progresses, and there is a remote possibility that our Sun will be more tightly
bound to Andromeda than to the Milky Way before the final merger. Eventually,
after the merger has completed, the Sun is most likely to be scattered to the
outer halo and reside at much larger radii (>30 kpc). The density profiles of
the stars, gas and dark matter in the merger product resemble those of
elliptical galaxies. Our Local Group model therefore provides a prototype
progenitor of late--forming elliptical galaxies.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:40:59 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 16:38:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cox",
"T. J.",
"",
"Harvard/CfA"
],
[
"Loeb",
"Abraham",
"",
"Harvard/CfA"
]
] |
0705.1171 | John E. McCarthy | Jim Agler and John E. McCarthy | Cusp Algebras | null | null | null | null | math.AG math.CV | null | We consider simple cusp algebras, that is certain subalgebras of the algebra
of holomorphic functions on a disk that are annihilated by some distributions
living on a singleton. We determine when these algebras can be holized in two
dimensions, and when these holizations are globally biholomorphic.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:41:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Agler",
"Jim",
""
],
[
"McCarthy",
"John E.",
""
]
] |
0705.1172 | Maurice de Gosson | Maurice de Gosson | Remarks on a paper by Cordero and Nicola on Feichtinger's Wiener amalgam
spaces and the Schroedinger equation | Short Note, 5 pages. Replacement: correction of typos, and
reservations about validity of statements | null | null | null | math-ph math.MP | null | We derive some consequences of very recent results of Cordero and Nicola on
the metaplectic representation, the Wiener amalgam spaces, (whose definition is
due to Feichtinger), and their applications to the regularity of the solutions
of Schroedinger equation with quadratic Weyl symbol. We do not however discuss
the validity of Cordero and Nicola's claims.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:42:12 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 14:25:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"de Gosson",
"Maurice",
""
]
] |
0705.1173 | Ignazio Licata | Ignazio Licata | Effective Physical Processes and Active Information in Quantum Computing | 10 pages; Added references for sections 2 and 5 | Quantum BioSystems, ISSN 1970-223X | null | null | physics.gen-ph quant-ph | null | The recent debate on hypercomputation has arisen new questions both on the
computational abilities of quantum systems and the Church-Turing Thesis role in
Physics. We propose here the idea of "effective physical process" as the
essentially physical notion of computation. By using the Bohm and Hiley active
information concept we analyze the differences between the standard form
(quantum gates) and the non-standard one (adiabatic and morphogenetic) of
Quantum Computing, and we point out how its Super-Turing potentialities derive
from an incomputable information source in accordance with Bell's constraints.
On condition that we give up the formal concept of "universality", the
possibility to realize quantum oracles is reachable. In this way computation is
led back to the logic of physical world.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:42:57 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 08:34:39 GMT"
},
{
"version": "v3",
"created": "Mon, 22 Oct 2007 19:00:45 GMT"
},
{
"version": "v4",
"created": "Tue, 23 Oct 2007 19:40:49 GMT"
}
] | 2010-04-26T00:00:00 | [
[
"Licata",
"Ignazio",
""
]
] |
0705.1174 | Philip W. Anderson | Philip W Anderson | Bose Fluids Above Tc: Incompressible Vortex Fluids and "Supersolidity" | null | null | 10.1103/PhysRevLett.100.215301 | null | cond-mat.supr-con cond-mat.stat-mech | null | This paper emphasizes that non-linear rotational or diamagnetic
susceptibility is characteristic of Bose fluids above their superfluid Tcs, and
for sufficiently slow rotation or weak B-fields amounts to an incompressible
response to vorticity. The cause is a missing term in the conventionally
accepted model Hamiltonian for quantized vortices in the Bose fluid. The
resulting susceptibility can account for recent observations of Chan et al on
solid He, and Ong et al on cuprate superconductors.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 20:44:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Anderson",
"Philip W",
""
]
] |
0705.1175 | Dong-Hee Kim | Dong-Hee Kim and Adilson E. Motter | Ensemble averageability in network spectra | 4 pages, 4 figures | Phys. Rev. Lett. 98, 248701 (2007) | 10.1103/PhysRevLett.98.248701 | null | cond-mat.stat-mech cond-mat.dis-nn nlin.AO nlin.CD | null | The extreme eigenvalues of connectivity matrices govern the influence of the
network structure on a number of network dynamical processes. A fundamental
open question is whether the eigenvalues of large networks are well represented
by ensemble averages. Here we investigate this question explicitly and validate
the concept of ensemble averageability in random scale-free networks by showing
that the ensemble distributions of extreme eigenvalues converge to peaked
distributions as the system size increases. We discuss the significance of this
result using synchronization and epidemic spreading as example processes.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:56:26 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 20:04:42 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Kim",
"Dong-Hee",
""
],
[
"Motter",
"Adilson E.",
""
]
] |
0705.1176 | Jean-Marc Couveignes | Jean-Marc Couveignes | Bases invariantes de friabilit\'e | null | null | null | null | math.NT | null | Given a finite residue field
$k$, one looks for a smoothness basis that is invariant under the
automorphism group of $k$. We construct models for some finite fields that
admit such a basis. This work aims at accelerating algorithms for computing
discrete logarithms in some finite residue fields.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 21:03:50 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Couveignes",
"Jean-Marc",
""
]
] |
0705.1177 | Stefan M\"uller | Stefan M\"uller | The Group of Hamiltonian Homeomorphisms in the L^\infty-norm | 16 pages | J. Korean Math. Soc. 45 (2008), no. 6, 1769-1784 | null | null | math.SG | null | The group Hameo (M,\omega) of Hamiltonian homeomorphisms of a connected
symplectic manifold (M,\omega) was defined and studied in [7] and further in
[6]. In these papers, the authors consistently used the L^{(1,\infty)}-Hofer
norm (and not the L^\infty-Hofer norm) on the space of Hamiltonian paths (see
below for the definitions). A justification for this choice was given in [7].
In this article we study the L^\infty-case. In view of the fact that the Hofer
norm on the group Ham (M,\omega) of Hamiltonian diffeomorphisms does not depend
on the choice of the L^{(1,\infty)}-norm vs. the L^\infty-norm [9], Y.-G. Oh
and D. McDuff (private communications) asked whether the two notions of
Hamiltonian homeomorphisms arising from the different norms coincide. We will
give an affirmative answer to this question in this paper.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 21:33:34 GMT"
}
] | 2016-07-28T00:00:00 | [
[
"Müller",
"Stefan",
""
]
] |
0705.1178 | Don Marolf | Steven B. Giddings and Donald Marolf | A global picture of quantum de Sitter space | 17 pages, 1 figure. v2: minor changes, references added. v3: minor
changes to correspond to PRD version | Phys.Rev.D76:064023,2007 | 10.1103/PhysRevD.76.064023 | null | hep-th gr-qc | null | Perturbative gravity about a de Sitter background motivates a global picture
of quantum dynamics in `eternal de Sitter space,' the theory of states which
are asymptotically de Sitter to both future and past. Eternal de Sitter physics
is described by a finite dimensional Hilbert space in which each state is
precisely invariant under the full de Sitter group. This resolves a
previously-noted tension between de Sitter symmetry and finite entropy.
Observables, implications for Boltzmann brains, and Poincare recurrences are
briefly discussed.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 21:22:49 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 00:14:19 GMT"
},
{
"version": "v3",
"created": "Thu, 20 Sep 2007 00:39:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Giddings",
"Steven B.",
""
],
[
"Marolf",
"Donald",
""
]
] |
0705.1179 | Uri Keshet | Uri Keshet and Shahar Hod | Analytic Study of Rotating Black-Hole Quasinormal Modes | Shortened and typos fixed; to appear in PRD Rapid communications | Phys.Rev.D76:061501,2007 | 10.1103/PhysRevD.76.061501 | null | gr-qc astro-ph hep-th | null | A Bohr-Sommerfeld equation is derived for the highly-damped quasinormal mode
frequencies omega(n>>1) of rotating black holes. It may be written as
2\int_C(p_r+ip_0)dr=(n+1/2)h, where p_r is the canonical momentum conjugate to
the radial coordinate r along null geodesics of energy hbar*omega and angular
momentum hbar*m, p_0=O(omega^0), and the contour C connects two complex turning
points of p_r. The solutions are omega(n) = - m*omega_0 - i(phi + n*delta),
where {omega_0,delta}>0 are functions of the black-hole parameters alone. Some
physical implications are discussed.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 22:15:41 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 05:25:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Keshet",
"Uri",
""
],
[
"Hod",
"Shahar",
""
]
] |
0705.1180 | Pawel Wocjan | Dominik Janzing and Pawel Wocjan | A PromiseBQP-complete String Rewriting Problem | transition rules corrected, added more detailed explanations | null | null | null | quant-ph | null | We are given three strings s, t, and t' of length L over some fixed finite
alphabet and an integer m that is polylogarithmic in L. We have a symmetric
relation on substrings of constant length that specifies which substrings are
allowed to be replaced with each other. Let Delta(n) denote the difference
between the numbers of possibilities to obtain t from s and t' from s after n
replacements. The problem is to determine the sign of Delta(m).
As promises we have a gap condition and a growth condition. The former states
that |Delta(m)| >= epsilon c^m where epsilon is inverse polylogarithmic in L
and c>0 is a constant. The latter is given by Delta(n) <= c^n for all n.
We show that this problem is PromiseBQP-complete, i.e., it represents the
class of problems which can be solved efficiently on a quantum computer.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 21:41:06 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jan 2008 22:54:44 GMT"
}
] | 2008-01-18T00:00:00 | [
[
"Janzing",
"Dominik",
""
],
[
"Wocjan",
"Pawel",
""
]
] |
0705.1181 | German Calderon | G. Calderon, J. H. Munoz, C. E. Vera | Nonleptonic two-body B-decays including axial-vector mesons in the final
state | 28 pages, 2 tables and one reference added, notation changed in
appendices, some numerical results and abstract corrected | Phys.Rev.D76:094019,2007 | 10.1103/PhysRevD.76.094019 | null | hep-ph | null | We present a systematic study of exclusive charmless nonleptonic two-body B
decays including axial-vector mesons in the final state. We calculate branching
ratios of B\to PA, VA and AA decays, where A, V and P denote an axial-vector, a
vector and a pseudoscalar meson, respectively. We assume naive factorization
hypothesis and use the improved version of the nonrelativistic ISGW quark model
for form factors in B\to A transitions. We include contributions that arise
from the effective \Delta B=1 weak Hamiltonian H_{eff}. The respective
factorized amplitude of these decays are explicitly showed and their penguin
contributions are classified. We find that decays B^-to a_1^0\pi^-,\barB^0\to
a_1^{\pm}\pi^{\mp}, B^-\to a_1^-\bar K^0, \bar B^0\to a_1^+K^-, \bar B^0\to
f_1\bar K^0, B^-\to f_1K^-, B^-\to K_1^-(1400)\etap, B^-\to b_1^-\bar K^{0},
and \bar B^0\to b_1^+\pi^-(K^-) have branching ratios of the order of 10^{-5}.
We also study the dependence of branching ratios for B \to K_1P(V,A) decays
(K_1=K_1(1270),K_1(1400)) with respect to the mixing angle between K_A and K_B.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 21:39:35 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 21:42:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Calderon",
"G.",
""
],
[
"Munoz",
"J. H.",
""
],
[
"Vera",
"C. E.",
""
]
] |
0705.1182 | Charles A. Akemann | Charles Akemann, Simon Wassermann and Nik Weaver | Pure states on free group C*-algebras | 3 pages, results improved with the addition of a third author | null | null | null | math.OA math.FA | null | We prove that all of the pure states of the reduced C*-algebra of the free
goup on $\aleph_1$ generators are *-automorphism equivalent and extract some
consequences of that fact.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 21:49:20 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 21:18:45 GMT"
}
] | 2007-11-06T00:00:00 | [
[
"Akemann",
"Charles",
""
],
[
"Wassermann",
"Simon",
""
],
[
"Weaver",
"Nik",
""
]
] |
0705.1183 | Ruoheng Liu | Ruoheng Liu and H. Vincent Poor | Multiple Antenna Secure Broadcast over Wireless Networks | 14 pages, 3 figures, to appear in the Proceedings of the First
International Workshop on Information Theory for Sensor Networks, Santa Fe,
NM, June 18 - 20, 2007 | null | null | null | cs.IT math.IT | null | In wireless data networks, communication is particularly susceptible to
eavesdropping due to its broadcast nature. Security and privacy systems have
become critical for wireless providers and enterprise networks. This paper
considers the problem of secret communication over the Gaussian broadcast
channel, where a multi-antenna transmitter sends independent confidential
messages to two users with perfect secrecy. That is, each user would like to
obtain its own message reliably and confidentially. First, a computable
Sato-type outer bound on the secrecy capacity region is provided for a
multi-antenna broadcast channel with confidential messages. Next, a dirty-paper
secure coding scheme and its simplified version are described. For each case,
the corresponding achievable rate region is derived under the perfect secrecy
requirement. Finally, two numerical examples demonstrate that the Sato-type
outer bound is consistent with the boundary of the simplified dirty-paper
coding secrecy rate region.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 21:50:24 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Liu",
"Ruoheng",
""
],
[
"Poor",
"H. Vincent",
""
]
] |
0705.1184 | Kevin Purbhoo | Kevin Purbhoo | Puzzles, Tableaux and Mosaics | 22 pages, 9 (large) figures, best viewed in colour | null | null | null | math.CO | null | We define mosaics, which are naturally in bijection with Knutson-Tao puzzles.
We define an operation on mosaics, which shows they are also in bijection with
Littlewood-Richardson skew-tableaux. Another consequence of this construction
is that we obtain bijective proofs of commutativity and associativity for the
ring structures defined either of these objects. In particular, we obtain a
new, easy proof of the Littlewood-Richardson rule. Finally we discuss how our
operation is related to other known constructions, particularly jeu de taquin.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 22:27:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Purbhoo",
"Kevin",
""
]
] |
0705.1185 | Eva Y. Andrei | Guohong Li and Eva Y. Andrei | Observation of Landau levels of Dirac fermions in graphite | 14 pages, 4 figures. to appear in Nature Physics | Nature Physics, 3, 623 (2007) | 10.1038/nphys653 | null | cond-mat.mes-hall | null | The low energy electronic excitations in single layer and bilayer graphite
(graphene) resemble quantum-relativistic particles also known as Dirac Fermions
(DF). They possess an internal degree of freedom, chirality, that leads to
unusual Landau Level (LL) energy sequences in a magnetic field and profoundly
alters the magneto-transport properties. One of the consequences is an
anomalous Quantum-Hall effect, recently detected in both single layer and
bi-layer graphene. However the underlying cause, the unusual LL sequence, was
never observed. Here we report the direct observation of LL of DF by means of
low temperature Scanning-Tunnelling-Spectroscopy (STS) on the surface of
graphite in fields up to 12 Tesla. We find evidence of coexistence of massless
and massive DF, and identify the zero-energy LL which is a unique consequence
of their quantum-relativistic nature. Surprisingly these strictly
two-dimensional properties emerge even on bulk graphite in samples where the
interlayer coupling is weak.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 22:57:17 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Li",
"Guohong",
""
],
[
"Andrei",
"Eva Y.",
""
]
] |
0705.1186 | Kyler Kuehn | The IceCube Collaboration: A. Achterberg, et al., and the IPN
Collaboration: K. Hurley, et al | The Search for Muon Neutrinos from Northern Hemisphere Gamma-Ray Bursts
with AMANDA | 44 pages, 10 figures; submitted to Astrophysical Journal | Astrophys.J.674:357-370,2008 | 10.1086/524920 | null | astro-ph | null | We present the results of the analysis of neutrino observations by the
Antarctic Muon and Neutrino Detector Array (AMANDA) correlated with photon
observations of more than 400 gamma-ray bursts (GRBs) in the Northern
Hemisphere from 1997 to 2003. During this time period, AMANDA's effective
collection area for muon neutrinos was larger than that of any other existing
detector. Based on our observations of zero neutrinos during and immediately
prior to the GRBs in the dataset, we set the most stringent upper limit on muon
neutrino emission correlated with gamma-ray bursts. Assuming a Waxman-Bahcall
spectrum and incorporating all systematic uncertainties, our flux upper limit
has a normalization at 1 PeV of
E^2{\Phi}_{\nu} {\leq} 6.0 \times 10^{-9} GeV cm^{-2} s^{-1} sr^{-1}, with
90% of the events expected within the energy range of ~10 TeV to ~3 PeV. The
impact of this limit on several theoretical models of GRBs is discussed, as
well as the future potential for detection of GRBs by next generation neutrino
telescopes. Finally, we briefly describe several modifications to this analysis
in order to apply it to other types of transient point sources.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 23:06:20 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"The IceCube Collaboration",
"",
""
],
[
"Achterberg",
"A.",
""
],
[
"Collaboration",
"the IPN",
""
],
[
":",
"",
""
],
[
"Hurley",
"K.",
""
]
] |
0705.1187 | Sergey Loyka | Sergey Loyka, Victoria Kostina, Francois Gagnon | Symbol Error Rates of Maximum-Likelihood Detector: Convex/Concave
Behavior and Applications | To appear in 2007 IEEE International Symposium on Information Theory
(ISIT 2007), Nice, June 2007 | null | 10.1109/ISIT.2007.4557176 | null | cs.IT math.IT | null | Convexity/concavity properties of symbol error rates (SER) of the maximum
likelihood detector operating in the AWGN channel (non-fading and fading) are
studied. Generic conditions are identified under which the SER is a
convex/concave function of the SNR. Universal bounds for the SER 1st and 2nd
derivatives are obtained, which hold for arbitrary constellations and are tight
for some of them. Applications of the results are discussed, which include
optimum power allocation in spatial multiplexing systems, optimum power/time
sharing to decrease or increase (jamming problem) error rate, and implication
for fading channels.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 23:18:16 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Loyka",
"Sergey",
""
],
[
"Kostina",
"Victoria",
""
],
[
"Gagnon",
"Francois",
""
]
] |
0705.1188 | Donal O'Connell | Jose Ramon Espinosa, Benjamin Grinstein, Donal O'Connell and Mark B.
Wise | Neutrino Masses in the Lee-Wick Standard Model | 7 pages, 1 figure | Phys.Rev.D77:085002,2008 | 10.1103/PhysRevD.77.085002 | CALT 68-2647, IFT-UAM/CSIC-07-21, UCSD/PTH 07-05 | hep-ph | null | Recently, an extension of the standard model based on ideas of Lee and Wick
has been discussed. This theory is free of quadratic divergences and hence has
a Higgs mass that is stable against radiative corrections. Here, we address the
question of whether or not it is possible to couple very heavy particles, with
masses much greater than the weak scale, to the Lee-Wick standard model degrees
of freedom and still preserve the stability of the weak scale. We show that in
the LW-standard model the familiar see-saw mechanism for generating neutrino
masses preserves the solution to the hierarchy puzzle provided by the higher
derivative terms. The very heavy right handed neutrinos do not destabilize the
Higgs mass. We give an example of new heavy degrees of freedom that would
destabilize the hierarchy, and discuss a general mechanism for coupling other
heavy degrees of freedom to the Higgs doublet while preserving the hierarchy.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 04:22:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Espinosa",
"Jose Ramon",
""
],
[
"Grinstein",
"Benjamin",
""
],
[
"O'Connell",
"Donal",
""
],
[
"Wise",
"Mark B.",
""
]
] |
0705.1189 | Nicolas Cowan | N. B. Cowan, E. Agol, D. Charbonneau | Hot Nights on Extrasolar Planets: Mid-IR Phase Variations of Hot
Jupiters | 7 pages, 8 figures, accepted for publication in MNRAS, modified
Figure 7 and resulting quantities | Mon.Not.Roy.Astron.Soc.379:641-646,2007 | 10.1111/j.1365-2966.2007.11897.x | null | astro-ph | null | We present results from Spitzer Space Telescope observations of the
mid-infrared phase variations of three short-period extrasolar planetary
systems: HD 209458, HD 179949 and 51 Peg. We gathered IRAC images in multiple
wavebands at eight phases of each planet's orbit. We find the uncertainty in
relative photometry from one epoch to the next to be significantly larger than
the photon counting error at 3.6 micron and 4.5 micron. We are able to place
2-sigma upper limits of only 2% on the phase variations at these wavelengths.
At 8 micron the epoch-to-epoch systematic uncertainty is comparable to the
photon counting noise and we detect a phase function for HD 179949 which is in
phase with the planet's orbit and with a relative peak-to-trough amplitude of
0.00141(33). Assuming that HD 179949b has a radius R_J < R_p < 1.2R_J, it must
recirculate less than 21% of incident stellar energy to its night side at the
1-sigma level (where 50% signifies full recirculation). If the planet has a
small Bond albedo, it must have a mass less than 2.4 M_J (1-sigma). We do not
detect phase variations for the other two systems but we do place the following
2-sigma upper limits: 0.0007 for 51 Peg, and 0.0015 for HD 209458. Due to its
edge-on configuration, the upper limit for HD 209458 translates, with
appropriate assumptions about Bond albedo, into a lower limit on the
recirculation occuring in the planet's atmosphere. HD 209458b must recirculate
at least 32% of incident stellar energy to its night side, at the 1-sigma
level, which is consistent with other constraints on recirculation from the
depth of secondary eclipse depth at 8 micron and the low optical albedo. These
data indicate that different Hot Jupiter planets may experience different
recirculation efficiencies.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 23:30:00 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 01:13:59 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Cowan",
"N. B.",
""
],
[
"Agol",
"E.",
""
],
[
"Charbonneau",
"D.",
""
]
] |
0705.1190 | Chunhui Chen | BaBar Collaboration: B. Aubert, et al | Measurement of CP-Violating Asymmetries in B0->D(*)+D- | Minor changes of the text and reference for the publication | Phys.Rev.Lett.99:071801,2007 | 10.1103/PhysRevLett.99.071801 | BABAR-PUB-07-24, SLAC-PUB-12506 | hep-ex | null | We present updated measurements of \CP-violating asymmetries in the decays
$\Bz\to\Dstarpm\Dmp$ and $\Bz\to\Dp\Dm$ using $(383\pm 4) \times 10^{6} \BB$
pairs collected by the \babar detector at the PEP-II $B$ factory. We determine
the time-integrated \CP asymmetry ${\mathcal{A}}_{\Dstarpm\Dmp}=0.12\pm 0.06\pm
0.02$, and the time-dependent asymmetry parameters to be $C_{\Dstarp\Dm}
=0.18\pm 0.15\pm 0.04$, $S_{\Dstarp\Dm}=-0.79\pm 0.21\pm 0.06$, $C_{\Dstarm\Dp}
=0.23\pm 0.15\pm 0.04$, $S_{\Dstarm\Dp} =-0.44\pm 0.22\pm 0.06$, $C_{\Dp\Dm}
=0.11\pm 0.22\pm 0.07$, and $S_{\Dp\Dm} =-0.54\pm 0.34\pm 0.06$, where the
first uncertainty is statistical and the second is systematic.
| [
{
"version": "v1",
"created": "Tue, 8 May 2007 23:46:58 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 17:37:02 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"BaBar Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0705.1191 | Miguel A. Solis | M.A. Sol\'is, M. de Llano, J.W. Clark, and George A. Baker Jr | Improved Quantum Hard-Sphere Ground-State Equations of State | 15 pages and 7 figures | Physical Review E 76, 031125 (2007) | 10.1103/PhysRevE.76.031125 | null | cond-mat.stat-mech cond-mat.soft | null | The London ground-state energy formula as a function of number density for a
system of identical boson hard spheres, corrected for the reduced mass of a
pair of particles in a sphere-of-influence picture, and generalized to fermion
hard-sphere systems with two and four intrinsic degrees of freedom, has a
double-pole at the ultimate \textit{regular} (or periodic, e.g.,
face-centered-cubic) close-packing density usually associated with a
crystalline branch. Improved fluid branches are contructed based upon exact,
field-theoretic perturbation-theory low-density expansions for many-boson and
many-fermion systems, appropriately extrapolated to intermediate densities, but
whose ultimate density is irregular or \textit{random} closest close-packing as
suggested in studies of a classical system of hard spheres. Results show
substantially improved agreement with the best available Green-function Monte
Carlo and diffusion Monte Carlo simulations for bosons, as well as with ladder,
variational Fermi hypernetted chain, and so-called L-expansion data for
two-component fermions.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 00:20:12 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Oct 2007 22:21:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Solís",
"M. A.",
""
],
[
"de Llano",
"M.",
""
],
[
"Clark",
"J. W.",
""
],
[
"Baker",
"George A.",
"Jr"
]
] |
0705.1192 | Roopa Narayan | R. H. Narayan | Indian Cosmological Ideas | 12 pages, 1 figure | null | null | null | physics.hist-ph | null | This paper, third in the series on Indian tradition of physics, describes
conceptions of the cosmos with ideas that are clearly spelt out in texts such
as Yoga Vasishtha.In particular, the conception of multiple universes that
occurs often in this text will be examined in the framework of the Indian
physics. The other surprising concepts that are discussed include flow of time
and its variability with respect to different observers, and the possibility of
passage across universes.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 00:23:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Narayan",
"R. H.",
""
]
] |
0705.1193 | Charles Stafford | Charles A. Stafford, David M. Cardamone, and Sumit Mazumdar | The Quantum Interference Effect Transistor: Principles and Perspectives | 12 pages, 7 figures | null | null | null | cond-mat.mes-hall | null | We give a detailed discussion of the Quantum Interference Effect Transistor
(QuIET), a proposed device which exploits interference between electron paths
through aromatic molecules to modulate current flow. In the off state, perfect
destructive interference stemming from the molecular symmetry blocks current,
while in the on state, current is allowed to flow by locally introducing either
decoherence or elastic scattering. Details of a model calculation demonstrating
the efficacy of the QuIET are presented, and various fabrication scenarios are
proposed, including the possibility of using conducting polymers to connect the
QuIET with multiple leads.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 00:27:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Stafford",
"Charles A.",
""
],
[
"Cardamone",
"David M.",
""
],
[
"Mazumdar",
"Sumit",
""
]
] |
0705.1194 | Duanlu Zhou | D.L. Zhou, Lan Zhou, R.Q. Wang, S. Yi, C.P. Sun | Deflection of Slow Light by Magneto-Optically Controlled Atomic Media | 4 pages, 3 figures | Phys. Rev. A 76, 055801 (2009) | 10.1103/PhysRevA.76.055801 | null | quant-ph | null | We present a semi-classical theory for light deflection by a coherent
$\Lambda$-type three-level atomic medium in an inhomogeneous magnetic field or
an inhomogeneous control laser. When the atomic energy levels (or the Rabi
coupling by the control laser) are position-dependent due to the Zeeman effect
by the inhomogeneous magnetic field (or the inhomogeneity of the control field
profile), the spatial dependence of the refraction index of the atomic medium
will result in an observable deflection of slow signal light when the
electromagnetically induced transparency happens to avoid medium absorption.
Our theoretical approach based on Fermat's principle in geometrical optics not
only provides a consistent explanation for the most recent experiment in a
straightforward way, but also predicts the new effects for the slow signal
light deflection by the atomic media in an inhomogeneous off-resonant control
laser field.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 00:43:07 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 11:05:03 GMT"
},
{
"version": "v3",
"created": "Thu, 6 Sep 2007 12:19:01 GMT"
}
] | 2014-03-05T00:00:00 | [
[
"Zhou",
"D. L.",
""
],
[
"Zhou",
"Lan",
""
],
[
"Wang",
"R. Q.",
""
],
[
"Yi",
"S.",
""
],
[
"Sun",
"C. P.",
""
]
] |
0705.1195 | Li Tong | Tong Li, Shu-Min Zhao and Xue-Qian Li | Comprehensive Calculations on the OZI-forbidden Nonleptonic Decays of
Orthoquarkonia $J/\psi(\Upsilon)\to \pi\pi,\rho\pi$ | 25 pages, 1 figure and 4 tables. Numerical results slightly changed | Nucl.Phys.A828:125-135,2009 | 10.1016/j.nuclphysa.2009.06.021 | null | hep-ph | null | In this work, we calculate the decay rates of the OZI-forbidden processes
$J/\psi(\Upsilon)\to \pi\pi, \rho\pi$ at the order of the leading-twist
distribution amplitude. The process of $J/\psi(\Upsilon)\to \pi^+ \pi^-$
violates isospin conservation and the amplitude is explicitly proportional to
the isospin violation factor $m_u-m_d$, our numerical results on their decay
rates are consistent with the data. The process $J/\psi(\Upsilon)\to \rho\pi$
violates the hadronic helicity conservation and should be suppressed, as
indicated in literature, its decay rate can only be proportional to $m_q^2$ at
the order of leading twist. Our theoretical evaluation confirms this statement
that the theoretical evaluation on $\Gamma(J/\psi(\Upsilon)\to \rho\pi)$ is
almost one order smaller than the data unless the model parameters take certain
extreme values. It may imply that the sizable branching ratio of
$J/\psi(\Upsilon)\to \rho\pi$ should be explained by either higher twist
contributions or other mechanisms.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 00:56:16 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Jun 2007 12:32:59 GMT"
},
{
"version": "v3",
"created": "Mon, 18 Jun 2007 23:17:47 GMT"
}
] | 2009-08-17T00:00:00 | [
[
"Li",
"Tong",
""
],
[
"Zhao",
"Shu-Min",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
0705.1196 | Masayuki Matsuzaki | Kouji Kashiwa (Kyushu Univ.), Masayuki Matsuzaki (Fukuoka Univ. of
Education), Hiroaki Kouno (Saga Univ.), Masanobu Yahiro (Kyushu Univ.) | Effects of a multi-quark interaction on color superconducting phase
transition in an extended NJL model | 9 pages, 3 figures | Phys.Lett.B657:143-147,2007 | 10.1016/j.physletb.2007.08.071 | SAGA-HE-234-07 | hep-ph nucl-th | null | We study the interplay of the chiral and the color superconducting phase
transitions in an extended Nambu--Jona-Lasinio model with a multi-quark
interaction that produces the nonlinear chiral-diquark coupling. We observe
that this nonlinear coupling adds up coherently with the \omega^2 interaction
to produce the chiral-color superconductivity coexistence phase or cancel each
other depending on its sign. We discuss that large coexistence region in the
phase diagram is consistent with the quark-diquark picture for the nucleon
whereas its smallness is the prerequisite for the applicability of the
Ginzburg-Landau approach.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 00:58:53 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 02:15:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kashiwa",
"Kouji",
"",
"Kyushu Univ."
],
[
"Matsuzaki",
"Masayuki",
"",
"Fukuoka Univ. of\n Education"
],
[
"Kouno",
"Hiroaki",
"",
"Saga Univ."
],
[
"Yahiro",
"Masanobu",
"",
"Kyushu Univ."
]
] |
0705.1197 | Kenton Brown | K. R. Brown, J. Britton, R. J. Epstein, J. Chiaverini, D. Leibfried,
D. J. Wineland | Passive Cooling of a Micromechanical Oscillator with a Resonant Electric
Circuit | 4 pages, 4 figures; minor changes to match published version | Physical Review Letters 99, 137205 (2007) | 10.1103/PhysRevLett.99.137205 | null | cond-mat.other quant-ph | null | We cool the fundamental mode of a miniature cantilever by capacitively
coupling it to a driven rf resonant circuit. Cooling results from the rf
capacitive force, which is phase shifted relative to the cantilever motion. We
demonstrate the technique by cooling a 7 kHz cantilever from room temperature
to 45 K, obtaining reasonable agreement with a model for the cooling, damping,
and frequency shift. Extending the method to higher frequencies in a cryogenic
system could enable ground state cooling and may prove simpler than related
optical experiments in a low temperature apparatus.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 01:35:10 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Sep 2007 15:38:00 GMT"
}
] | 2007-09-26T00:00:00 | [
[
"Brown",
"K. R.",
""
],
[
"Britton",
"J.",
""
],
[
"Epstein",
"R. J.",
""
],
[
"Chiaverini",
"J.",
""
],
[
"Leibfried",
"D.",
""
],
[
"Wineland",
"D. J.",
""
]
] |
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