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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.3998 | Carlos Bertulani | C. A. Bertulani and M. S. Hussein | Geometry of Borromean Halo Nuclei | 5 pages, one figure, version to appear in PRC, Rapid Communications | Phys.Rev.C76:051602,2007 | 10.1103/PhysRevC.76.051602 | null | nucl-th | null | We discuss the geometry of the highly quantal nuclear three-body systems
composed of a core plus two loosely bound particles. These Borromean nuclei
have no single bound two-body subsystem. Correlation plays a prominent role.
From consideration of the $B(E1)$ value extracted from electromagnetic
dissociation, in conjunction with HBT-type analysis of the two valence-halo
particles correlation, we show that an estimate of the over-all geometry can be
deduced. In particular we find that the opening angle between the two neutrons
in $^{6}$He and $^{11}$Li are, respectively, $\theta_{nn} =
{83^{\circ}}^{+20}_{-10}$ and ${66^{\circ}}^{+22}_{-18}$. These angles are
reduced by about 12% to $\theta_{nn} = {78^{\circ}}^{+13}_{-18}$ and
${58^{\circ}}^{+10}_{-14}$ if the laser spectroscopy values of the rms charge
radii are used to obtain the rms distance between the cores and the center of
mass of the two neutrons. The opening angle in the case of $^{11}$Li is more
than 20% larger than recently reported by Nakamura \cite{Nak06}. The analysis
is extended to $^{14}$Be and the two-proton Borromean nucleus $^{17}% $Ne where
complete data is still not available. Using available experimental data and
recent theoretical calculations we find, $\theta_{nn} = {64^{0}}^{+9}_{-10}$
and $\theta_{pp} = 110^{0}$, respectively.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 03:55:44 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Jun 2007 00:28:11 GMT"
},
{
"version": "v3",
"created": "Tue, 14 Aug 2007 03:16:39 GMT"
},
{
"version": "v4",
"created": "Fri, 12 Oct 2007 01:34:36 GMT"
},
{
"version": "v5",
"created": "Wed, 7 Nov 2007 18:10:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bertulani",
"C. A.",
""
],
[
"Hussein",
"M. S.",
""
]
] |
0705.3999 | Asan Damanik | Asan Damanik, Mirza Satriawan, Muslim, Pramudita Anggraita | Left-Right Symmetry Model with Two Bidoublets and One Doublet Higgs
Field for Electroweak Interaction | 8 pages, no figure | J. Theor. Comput. Stud. 6: 0404, 2007 | null | null | hep-ph | null | We use the left-right symmetry model based on SU(2)_{L}xSU(2)_{R}xU(1)_{B-L}
gauge group with two bidoublets and one doublet Higgs field for electroweak
interaction. The lepton fields are represented as a doublet of SU(2)for both
left and right fields. By using the pattern of symmetry breaking emerges as the
minimum of the Higgs potential for a range of parameters, we show that the
domination of the V-A over V+A interactions is natural at low energy. The
symmetry breaking is the responsible mechanism for the up-down lepton doublet
mass difference
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 04:41:17 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jul 2007 04:30:49 GMT"
}
] | 2010-09-22T00:00:00 | [
[
"Damanik",
"Asan",
""
],
[
"Satriawan",
"Mirza",
""
],
[
"Muslim",
"",
""
],
[
"Anggraita",
"Pramudita",
""
]
] |
0705.4000 | Mehdi Hassani | Mehdi Hassani, Zahra Jafari | Identities by Generalized $L-$Summing Method | 8 pages, 2 figures | null | null | null | math.NA math.NT | null | In this paper, we introduce 3-dimensional $L-$summing method, which is a
rearrangement of the summation $\sum A_{abc}$ with $1\leq a,b,c\leq n$.
Applying this method on some special arrays, we obtain some identities on the
Riemann zeta function and digamma function. Also, we give a Maple program for
this method to obtain identities with input various arrays and out put
identities concerning some elementary functions and hypergeometric functions.
Finally, we introduce a further generalization of $L-$summing method in higher
dimension spaces.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 04:59:31 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Hassani",
"Mehdi",
""
],
[
"Jafari",
"Zahra",
""
]
] |
0705.4001 | Jacinda Ginges | V.A. Dzuba, V.V. Flambaum, and J.S.M. Ginges | Atomic electric dipole moments of He and Yb induced by nuclear Schiff
moments | 4 pages | Phys.Rev.A76:034501,2007 | 10.1103/PhysRevA.76.034501 | null | physics.atom-ph | null | We have calculated the atomic electric dipole moments (EDMs) d of ^3He and
^{171}Yb induced by their respective nuclear Schiff moments S. Our results are
d(He)= 8.3x10^{-5} and d(Yb)= -1.9 in units 10^{-17}S/(e{fm}^3)e cm. By
considering the nuclear Schiff moments induced by the parity and time-reversal
violating nucleon-nucleon interaction we find d(^{171}Yb)~0.6d(^{199}Hg). For
^3He the nuclear EDM coupled with the hyperfine interaction gives a larger
atomic EDM than the Schiff moment. The result for ^3He is required for a
neutron EDM experiment that is under development, where ^3He is used as a
comagnetometer. We find that the EDM for He is orders of magnitude smaller than
the neutron EDM. The result for Yb is needed for the planning and
interpretation of experiments that have been proposed to measure the EDM of
this atom.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 05:58:32 GMT"
}
] | 2009-02-05T00:00:00 | [
[
"Dzuba",
"V. A.",
""
],
[
"Flambaum",
"V. V.",
""
],
[
"Ginges",
"J. S. M.",
""
]
] |
0705.4002 | Hao Wei | Hao Wei, Shuang Nan Zhang | Dynamics of Quintom and Hessence Energies in Loop Quantum Cosmology | 14 pages, 4 tables, revtex4; v2: accepted for publication in Phys.
Rev. D; v3: published version | Phys.Rev.D76:063005,2007 | 10.1103/PhysRevD.76.063005 | null | gr-qc astro-ph hep-th | null | In the present work, we investigate the universe dominated by quintom or
hessence energies in Loop Quantum Cosmology (LQC). Interestingly enough, we
find that there are some stable attractors in these two cases. In the case of
quintom, all stable attractors have the feature of decelerated expansion. In
the case of hessence, most of stable attractors have the feature of decelerated
expansion while one stable attractor can have decelerated or accelerated
expansion depend on the model parameter. In all cases, the equation-of-state
parameter (EoS) of all stable attractors are larger than -1 and there is no
singularity in the finite future. These results are different from the dynamics
of phantom in LQC, or the ones of phantom, quintom and hessence in classical
Einstein gravity.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 09:43:58 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 08:23:02 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Sep 2007 06:40:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wei",
"Hao",
""
],
[
"Zhang",
"Shuang Nan",
""
]
] |
0705.4003 | Peter Rohde | Peter P. Rohde, James G. Webb, Elanor H. Huntington, Timothy C. Ralph | Comparison of architectures for approximating number-resolving
photo-detection using non-number-resolving detectors | 9 pages, 10 figures | New J. Phys. 9, 233 (2007) | null | null | quant-ph | null | Number-resolving photo-detection is necessary for many quantum optics
experiments, especially in the application of entangled state preparation.
Several schemes have been proposed for approximating number-resolving
photo-detection using non-number-resolving detectors. Such techniques include
multi-port detection and time-division multiplexing. We provide a detailed
analysis and comparison of different number-resolving detection schemes, with a
view to creating a useful reference for experimentalists. We show that the
ideal architecture for projective measurements is a function of the detector's
dark count and efficiency parameters. We also describe a process for selecting
an appropriate topology given actual experimental component parameters.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 06:58:34 GMT"
}
] | 2008-05-19T00:00:00 | [
[
"Rohde",
"Peter P.",
""
],
[
"Webb",
"James G.",
""
],
[
"Huntington",
"Elanor H.",
""
],
[
"Ralph",
"Timothy C.",
""
]
] |
0705.4004 | Samy Skander Bahoura | Samy Skander Bahoura (IMJ) | About Brezis-Merle Problem with Lipschitz condition | null | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give blow-up analysis for a Brezis-Merle's problem on the boundary. Also
we give a proof of a compactness result with Lipschitz condition and weaker
assumption on the regularity of the domain (smooth domain or $ C^{2,\alpha} $
domain).
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:08:57 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Sep 2007 11:17:59 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Jun 2013 09:45:13 GMT"
},
{
"version": "v4",
"created": "Mon, 20 Apr 2015 09:00:58 GMT"
},
{
"version": "v5",
"created": "Fri, 20 May 2016 14:45:12 GMT"
},
{
"version": "v6",
"created": "Tue, 2 Oct 2018 07:43:41 GMT"
},
{
"version": "v7",
"created": "Fri, 7 Dec 2018 15:40:25 GMT"
},
{
"version": "v8",
"created": "Thu, 6 Aug 2020 11:40:03 GMT"
}
] | 2020-08-07T00:00:00 | [
[
"Bahoura",
"Samy Skander",
"",
"IMJ"
]
] |
0705.4005 | Alain Pham Ngoc Dinh | Radjaverane Alexandre (DP), Long Nguyen Thanh, Alain Pham Ngoc Dinh
(MAPMO) | Mathematical Model for the Evaporation of a Liquid Fuel Droplet, Subject
to Nonlinear Constraints | 19 pages | Applied Mathematics and Computation 199 (2008) 139-154 | null | null | math.AP | null | We study the mathematical evolution of a liquid fuel droplet inside a vessel.
In particular, we analyze the evolution of the droplet radius on a finite time
interval. The model problem involves an hyperbolic system coupled with the
pressure and velocity of the surrounding gas. Existence of bounded solutions
for the mass fraction of the liquid, submitted to nonlinear constraints, is
shown. Numerical simulations are given, in agreement with known physical
experiments.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:12:20 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Alexandre",
"Radjaverane",
"",
"DP"
],
[
"Thanh",
"Long Nguyen",
"",
"MAPMO"
],
[
"Dinh",
"Alain Pham Ngoc",
"",
"MAPMO"
]
] |
0705.4006 | Anton Zabrodin | A. Zabrodin | Backlund transformations for difference Hirota equation and
supersymmetric Bethe ansatz | 22 pages, 2 figures, based on the talk given at the Workshop
"Classical and Quantum Integrable Systems", Dubna, January 2007 | null | 10.1007/s11232-008-0047-2 | ITEP-TH-21/07 | hep-th nlin.SI | null | We consider GL(K|M)-invariant integrable supersymmetric spin chains with
twisted boundary conditions and elucidate the role of Backlund transformations
in solving the difference Hirota equation for eigenvalues of their transfer
matrices. The nested Bethe ansatz technique is shown to be equivalent to a
chain of successive Backlund transformations "undressing" the original problem
to a trivial one.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:05:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zabrodin",
"A.",
""
]
] |
0705.4007 | Francesco Toppan | Z. Kuznetsova, M. Rojas and F. Toppan | On Supergroups with Odd Clifford Parameters and Supersymmetry with
Modified Leibniz Rule | Final version to be published in Int. J. Mod. Phys. A; 20 pages | Int.J.Mod.Phys.A23:309-326,2008 | 10.1142/S0217751X08038159 | CBPF-NF-009/07 | hep-th math-ph math.MP | null | We investigate supergroups with Grassmann parameters replaced by odd Clifford
parameters. The connection with non-anticommutative supersymmetry is discussed.
A Berezin-like calculus for odd Clifford variables is introduced. Fermionic
covariant derivatives for supergroups with odd Clifford variables are derived.
Applications to supersymmetric quantum mechanics are made. Deformations of the
original supersymmetric theories are encountered when the fermionic covariant
derivatives do not obey the graded Leibniz property. The simplest non-trivial
example is given by the N=2 SQM with a real $(1,2,1)$ multiplet and a cubic
potential. The action is real. Depending on the overall sign ("Euclidean" or
"Lorentzian") of the deformation, a Bender-Boettcher pseudo-hermitian
hamiltonian is encountered when solving the equation of motion of the auxiliary
field. A possible connection of our framework with the Drinfeld twist
deformation of supersymmetry is pointed out.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:35:42 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 02:27:08 GMT"
}
] | 2011-10-10T00:00:00 | [
[
"Kuznetsova",
"Z.",
""
],
[
"Rojas",
"M.",
""
],
[
"Toppan",
"F.",
""
]
] |
0705.4008 | Fabio Cossutti | The BABAR Collaboration: B. Aubert, et al | Determination of the Form Factors for the Decay B0 -> D*- l+ nu_l and of
the CKM Matrix Element |V_cb| | 18 pages, 7 postscript figures | Phys.Rev.D77:032002,2008 | 10.1103/PhysRevD.77.032002 | BABAR-PUB-07/008, SLAC-PUB-12511 | hep-ex | null | We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix
element |V_{cb}| and of the parameters rho^2, R_1(1), and R_2(1), which fully
characterize the form factors for the B0 -> D*- l+ nu_l decay in the framework
of heavy-quark effective theory. The results, based on a selected sample of
about 52,800 B0 -> D*- l+ nu_l decays, recorded by the BaBar detector, are
rho2=1.157+-0.094+-0.027, R_1(1)=1.327+-0.131+-0.043,
R_2(1)=0.859+-0.077+-0.021, and F(1)|V_cb|=(34.7+-0.4+-1.0)x10^-3. The first
error is the statistical and the second is the systematic uncertainty.
Combining these measurements with the previous BaBar measurement of the form
factors, which employs a different fit technique on a partial sample of the
data, we improve the statistical precision of the result,
rho2=1.191+-0.048+-0.028, R_1(1)=1.429+-0.061+-0.044,
R_2(1)=0.827+-0.038+-0.022, and F(1)|V_cb| = (34.4+-0.3+-1.1)x10^-3. Using
lattice calculations for the axial form factor $\mathcal{F}(1)$, we extract
|V_cb| =(37.4+-0.3+-1.2+1.2-1.4)x10^-3, where the third error is due to the
uncertainty in F(1). We also present a measurement of the exclusive branching
fraction, B = (4.69+-0.04+-0.34)%.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:28:51 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Feb 2008 16:06:12 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0705.4009 | Marius Buliga | Marius Buliga | Linear dilatation structures and inverse semigroups | larger version | null | null | null | math.GR math.MG | null | Here we prove that for dilatation structures linearity (see
arXiv:0705.1440v1) is equivalent to a statement about the inverse semigroup
generated by the family of dilatations of the space.
The result is new for Carnot groups and the proof seems to be new even for
vector spaces.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:42:21 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 10:50:33 GMT"
},
{
"version": "v3",
"created": "Thu, 7 Jun 2007 11:04:24 GMT"
}
] | 2007-06-07T00:00:00 | [
[
"Buliga",
"Marius",
""
]
] |
0705.4010 | YaJuan Lei | Y.J. Lei, F.J. Lu, J.L. Qu, L.M. Song, C.M. Zhang | Spectral study on the dips of Cir X-1 | 17 pages, 13 figures, accepted for publication in ChJAA | null | null | null | astro-ph | null | We present X-ray spectral analyses of low mass X-ray binary Cir X-1 during
X-ray dips, using the Rossi X-ray Timing Explorer (RXTE) data. Each dip was
divided into several segments, and the spectrum of each segment was fitted with
a three-component blackbody model, in which two components are affected by
partial covering and the third one is unaffected. A Gaussian emission line is
also included in the spectral model to represent the Fe Ka line at ~ 6.4 keV.
The fitted temperatures of the two partially covered components are about 2 keV
and 1 keV, while the uncovered component has a temperature of ~ 0.5-0.6 keV.
The equivalent blackbody emission radius of the hottest component is the
smallest and that of the coolest component is the biggest. During dips, the
fluxes of the two hot components are linearly correlated, while that of the
third component doesn't show any significant variation. The Fe line flux
remains constant within errors during the short dips. However, during the long
dips the line flux changes significantly and is positively correlated with the
fluxes of the two hot components. These results suggest: (1) the temperature of
the X-ray emitting region decreases with radius, (2) the Fe Ka line emitting
region is close to the hot continuum emitting region, and (3) the size of the
Fe line emitting region is bigger than the size of the obscuring matters
causing short dips but smaller than the sizes of those causing long dips.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:42:48 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Lei",
"Y. J.",
""
],
[
"Lu",
"F. J.",
""
],
[
"Qu",
"J. L.",
""
],
[
"Song",
"L. M.",
""
],
[
"Zhang",
"C. M.",
""
]
] |
0705.4011 | Rui-Feng Wang | R.F. Wang | The Dynamical Mechanism of the Aharonov-Bohm Effect | 13pages,2figures | null | 10.1088/1674-1056/18/8/022 | null | quant-ph | null | In this paper, it is emphasized that the dynamical cause for the A-B effect
is the superimposed energy between the magnetic field produced by the moving
charges and that in the solenoid, instead of the existence of the vector
potential. If such a superposition between the magnetic fields can be
eliminated, the A-B effect should not be observed any more. To verify this
viewpoint, a new experimental method using a SQUID is suggested in this paper.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:50:31 GMT"
}
] | 2014-09-19T00:00:00 | [
[
"Wang",
"R. F.",
""
]
] |
0705.4012 | Hiromi Saida | Hiromi Saida, Tomohiro Harada and Hideki Maeda | Black Hole Evaporation in an Expanding Universe | Accepted for publication in Class.Quant.Grav., 18 pages and 3 figures | Class.Quant.Grav.24:4711-4732,2007 | 10.1088/0264-9381/24/18/011 | CECS-PHY-07/08 | gr-qc astro-ph hep-th | null | We calculate the quantum radiation power of black holes which are asymptotic
to the Einstein-de Sitter universe at spatial and null infinities. We consider
two limiting mass accretion scenarios, no accretion and significant accretion.
We find that the radiation power strongly depends on not only the asymptotic
condition but also the mass accretion scenario. For the no accretion case, we
consider the Einstein-Straus solution, where a black hole of constant mass
resides in the dust Friedmann universe. We find negative cosmological
correction besides the expected redshift factor. This is given in terms of the
cubic root of ratio in size of the black hole to the cosmological horizon, so
that it is currently of order $10^{-5} (M/10^{6}M_{\odot})^{1/3} (t/14
{Gyr})^{-1/3}$ but could have been significant at the formation epoch of
primordial black holes. Due to the cosmological effects, this black hole has
not settled down to an equilibrium state. This cosmological correction may be
interpreted in an analogy with the radiation from a moving mirror in a flat
spacetime. For the significant accretion case, we consider the Sultana-Dyer
solution, where a black hole tends to increase its mass in proportion to the
cosmological scale factor. In this model, we find that the radiation power is
apparently the same as the Hawking radiation from the Schwarzschild black hole
of which mass is that of the growing mass at each moment. Hence, the energy
loss rate decreases and tends to vanish as time proceeds. Consequently, the
energy loss due to evaporation is insignificant compared to huge mass accretion
onto the black hole. Based on this model, we propose a definition of
quasi-equilibrium temperature for general conformal stationary black holes.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 07:51:43 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Aug 2007 07:07:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Saida",
"Hiromi",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Maeda",
"Hideki",
""
]
] |
0705.4013 | Shinsuke Iwao | Shinsuke Iwao and Tetsuji Tokihiro | Ultradiscretization of the solution of periodic Toda equation | 41 pages; 7 figures | J.Phys.A. Math. Theor 40 12987-13021 2007 | 10.1088/1751-8113/40/43/010 | null | math-ph math.MP | null | A periodic box-ball system (pBBS) is obtained by ultradiscretizing the
periodic discrete Toda equation (pd Toda eq.). We show the relation between a
Young diagram of the pBBS and a spectral curve of the pd Toda eq.. The formula
for the fundamental cycle of the pBBS is obtained as a colloraly.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 08:14:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iwao",
"Shinsuke",
""
],
[
"Tokihiro",
"Tetsuji",
""
]
] |
0705.4014 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev, Vladimir Folomeev, Kairat Myrzakulov and
Ratbay Myrzakulov | Thick brane in 7D and 8D spacetimes | 3 Ref's are added | Gen.Rel.Grav.41:131-146,2009 | 10.1007/s10714-008-0659-8 | null | gr-qc hep-th | null | We consider a thick brane model supported by two interacting scalar fields in
7D and 8D general relativity. Using the special type of a potential energy, we
obtain numerically the regular asymptotically flat vacuum solutions. A
possibility of obtaining the similar solutions for an arbitrary number of the
extra spatial dimensions is estimated.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 08:30:08 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 01:51:11 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Myrzakulov",
"Kairat",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] |
0705.4015 | Dan Bernstein | Dan Bernstein | Strict Partitions of Maximal Projective Degree | null | null | null | null | math.CO | null | The projective degrees of strict partitions of n were computed for all n <
101 and the partitions with maximal projective degree were found for each n. It
was observed that maximizing partitions for successive values of n "lie close
to each other" in a certain sense. Conjecturing that this holds for larger
values of n, the partitions of maximal degree were computed for all n < 221.
The results are consistent with a recent conjecture on the limiting shape of
the strict partition of maximal projective degree.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 08:48:55 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Bernstein",
"Dan",
""
]
] |
0705.4016 | Samuel Calvet | Samuel Calvet (for the D0 collaboration) | Search For Squarks And Gluinos At DO | 4 pages, Presented at Moriond Electroweak, La Thuile, Italy, 15 March
2007 | null | null | null | hep-ex | null | A search for scalar quarks and gluinos is performed with 0.96 fb^{-1} of data
collected by the DO experiment in p\bar{p} collisions at \sqrt{s}=1.96 TeV at
the Fermilab Tevatron Collider. The topologies analyzed consist of acoplanar
jets and multijet events with missing transverse energy. We find the data to be
consistent with Standard Model expectations, and set 95% C.L. exclusion domains
in the squark and gluino mass plane and in the (m_0, m_{1/2}) plane, within the
framework of minimal supergravity with tan\beta=3, A_0=0 and \mu<0.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 09:06:48 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Calvet",
"Samuel",
"",
"for the D0 collaboration"
]
] |
0705.4017 | Murat Cetinbas | Murat Cetinbas and Joshua Wilkie | Quantum pathology of static internal imperfections in flawed quantum
computers | null | Physics Letters A, Volume 370, Issues 3-4, 22 October 2007, Pages
207-212 | 10.1016/j.physleta.2007.05.074 | null | quant-ph | null | Even in the absence of external influences the operability of a quantum
computer (QC) is not guaranteed because of the effects of residual one- and
two-body imperfections. Here we investigate how these internal flaws affect the
performance of a quantum controlled-NOT (CNOT) gate in an isolated flawed QC.
First we find that the performance of the CNOT gate is considerably better when
the two-body imperfections are strong. Secondly, we find that the largest
source of error is due to a coherent shift rather than decoherence or
dissipation. Our results suggest that the problem of internal imperfections
should be given much more attention in designing scalable QC architectures.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 08:50:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cetinbas",
"Murat",
""
],
[
"Wilkie",
"Joshua",
""
]
] |
0705.4018 | Murat Cetinbas | Murat Cetinbas and Joshua Wilkie | Probing internal bath dynamics by a Rabi oscillator-based detector | null | Physics Letters A, Volume 370, Issues 3-4, 22 October 2007, Pages
194-201 | 10.1016/j.physleta.2007.05.075 | null | quant-ph | null | By exact numerical and master equation approaches, we show that a central
spin-1/2 can be configured to probe internal bath dynamics. System-bath
interactions cause Rabi oscillations in the detector and periodic behavior of
fidelity. This period is highly sensitive to the strength of the bath
self-interactions, and can be used to calculate the intra-bath coupling.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 09:00:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cetinbas",
"Murat",
""
],
[
"Wilkie",
"Joshua",
""
]
] |
0705.4019 | Andrea Macchi | T. V. Liseykina, A. Macchi | Features of ion acceleration by circularly polarized laser pulses | 4 pages, 4 figures | null | 10.1063/1.2803318 | null | physics.plasm-ph | null | The characteristics of a MeV ion source driven by superintense, ultrashort
laser pulses with circular polarization are studied by means of
particle-in-cell simulations. Predicted features include high efficiency, large
ion density, low divergence and the possibility of femtosecond duration. A
comparison with the case of linearly polarized pulses is made.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 09:31:40 GMT"
}
] | 2019-02-13T00:00:00 | [
[
"Liseykina",
"T. V.",
""
],
[
"Macchi",
"A.",
""
]
] |
0705.4020 | Ranjeev Misra | Tanuka Chattopadhyay (Dinobundhoo Coll.), Ranjeev Misra (IUCAA), Asis
Kumar Chattopadhyay (Dept. of Statistics, Calcutta Univ.) and Malay Naskar
(NIRJAIT) | Statistical Evidence for Three classes of Gamma-ray Bursts | 7 pages, accepted for publication in the Astrophysical Journal. Minor
editorial changes | Astrophys.J.667:1017-1023,2007 | 10.1086/520317 | null | astro-ph | null | Two different multivariate clustering techniques, the K-means partitioning
method and the Dirichlet process of mixture modeling, have been applied to the
BATSE Gamma-ray burst (GRB) catalog, to obtain the optimum number of coherent
groups. In the standard paradigm, GRB are classified in only two groups, the
long and short bursts. However, for both the clustering techniques, the optimal
number of classes was found to be three, a result which is consistent with
previous statistical analysis. In this classification, the long bursts are
further divided into two groups which are primarily differentiated by their
total fluence and duration and hence are named low and high fluence GRB.
Analysis of GRB with known red-shifts and spectral parameters suggests that low
fluence GRB have nearly constant isotropic energy output of 10^{52} ergs while
for the high fluence ones, the energy output ranges from 10^{52} to 10^{54}
ergs. It is speculated that the three kinds of GRBs reflect three different
origins: mergers of neutron star systems, mergers between white dwarfs and
neutron stars, and collapse of massive stars.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 09:35:07 GMT"
},
{
"version": "v2",
"created": "Sat, 21 Jul 2007 07:15:33 GMT"
}
] | 2010-06-22T00:00:00 | [
[
"Chattopadhyay",
"Tanuka",
"",
"Dinobundhoo Coll."
],
[
"Misra",
"Ranjeev",
"",
"IUCAA"
],
[
"Chattopadhyay",
"Asis Kumar",
"",
"Dept. of Statistics, Calcutta Univ."
],
[
"Naskar",
"Malay",
"",
"NIRJAIT"
]
] |
0705.4021 | Mitsuo J. Hayashi | Yusuke Okame and Mitsuo J. Hayashi | (0,2) Gauged Linear Sigma Model on Supermanifold | 19 pages, no figures, Verification of component fields are deleted | Annalen Phys.18:585-603,2009 | 10.1002/andp.200910359 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct (0,2), D=2 gauged linear sigma model on a supermanifold in both
the Abelian gauge group and the non-Abelian gauge group. The $\hat{U}$ operator
provides consistency conditions for satisfying the SUSY invariance. Contrary to
the Abelian gauge group, it is not essential to introduce the new operator in
order to check the exact SUSY invariance of the Lagrangian density. However, in
order to introduce the (0,2) chiral superfields, we need the $\hat{U}$
operator, because we can not define the (0,2) chirality conditions of the (0,2)
chiral superfields without introducing the new operator by using $\hat{U}$ and
the enlarged operator \hat{U}^{a} was obtained from the conditions that yield
the (0,2) supersymmetric invariance of the Lagrangian density of the (0,2) U(N)
gauged linear sigma model in superfield formalism. We found that the
consistency conditions for the Abelian gauge group which assure the (0,2)
supersymmetric invariance of Lagrangian density agree with (0,2) chirality
conditions for superpotential. The supermanifold \mathcal{M}^{m|n} becomes the
super weighted complex projective space WCP^{m-1|n} in U(1) case, which is
considered as an example of Calabi-Yau supermanifold.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 09:52:28 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 05:41:14 GMT"
},
{
"version": "v3",
"created": "Sat, 3 May 2008 05:17:23 GMT"
},
{
"version": "v4",
"created": "Thu, 6 Aug 2009 05:39:48 GMT"
}
] | 2009-09-28T00:00:00 | [
[
"Okame",
"Yusuke",
""
],
[
"Hayashi",
"Mitsuo J.",
""
]
] |
0705.4022 | Futoshi Yagi | Teruhiko Kawano, Futoshi Yagi | Supersymmetric N=1 Spin(10) Gauge Theory with Two Spinors via
a-Maximization | 24 pages, 4 figures, harvmac | Nucl.Phys.B786:135-151,2007 | 10.1016/j.nuclphysb.2007.07.007 | UT-07-16 | hep-th | null | We give a detailed analysis of the superconformal fixed points of
four-dimensional N=1 supersymmetric Spin(10) gauge theory with two spinors and
vectors by using a-maximization procedure.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 10:10:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kawano",
"Teruhiko",
""
],
[
"Yagi",
"Futoshi",
""
]
] |
0705.4023 | Zolt\'an Eisler | Zoltan Eisler, Janos Kertesz, Fabrizio Lillo | The limit order book on different time scales | 11 pages, 7 figures, 2 tables, to appear in Proc. SPIE, Fluctuations
and Noise 2007, Florence | Proc. SPIE 6601, 66010G (2007) | 10.1117/12.724817 | null | q-fin.TR physics.data-an physics.soc-ph | null | Financial markets can be described on several time scales. We use data from
the limit order book of the London Stock Exchange (LSE) to compare how the
fluctuation dominated microstructure crosses over to a more systematic global
behavior.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:41:48 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Eisler",
"Zoltan",
""
],
[
"Kertesz",
"Janos",
""
],
[
"Lillo",
"Fabrizio",
""
]
] |
0705.4024 | Claude Dion | Claude M. Dion and Eric Cances | Ground state of the time-independent Gross-Pitaevskii equation | null | Comput. Phys. Commun. 177, 787 (2007) | 10.1016/j.cpc.2007.04.007 | null | physics.comp-ph cond-mat.other physics.atom-ph | null | We present a suite of programs to determine the ground state of the
time-independent Gross-Pitaevskii equation, used in the simulation of
Bose-Einstein condensates. The calculation is based on the Optimal Damping
Algorithm, ensuring a fast convergence to the true ground state. Versions are
given for the one-, two-, and three-dimensional equation, using either a
spectral method, well suited for harmonic trapping potentials, or a spatial
grid.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 10:19:46 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 15:28:41 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Dion",
"Claude M.",
""
],
[
"Cances",
"Eric",
""
]
] |
0705.4025 | Andrea Veglio | A. Veglio and M. Marsili | Stochastic analysis of an agent-based model | 6 pages, 2 figures | null | 10.1016/j.physa.2007.07.027 | null | q-fin.TR physics.soc-ph | null | We analyze the dynamics of a forecasting game which exhibits the phenomenon
of information cascades. Each agent aims at correctly predicting a binary
variable and he/she can either look for independent information or herd on the
choice of others. We show that dynamics can be analitically described in terms
of a Langevin equation and its collective behavior is described by the solution
of a Kramers' problem. This provides very accurate results in the region where
the vast majority of agents herd, which corresponds to the most interesting one
from a game theoretic point of view.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 10:31:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Veglio",
"A.",
""
],
[
"Marsili",
"M.",
""
]
] |
0705.4026 | Yu-Jun Cui | Yu-Jun Cui (ENPC-Cermes), Anh-Minh Tang (ENPC-Cermes), Duilio Marcial
(IMME - Ucv), Jean-Marc Terpereau (SNCF), Gilles Marchadier (SNCF), Xavier
Boulay (ENPC-Cermes) | Use of a differential pressure transducer for the monitoring of soil
volume change in cyclic triaxial test on unsaturated soils | null | Geotechnical Testing Journal 30, 3 (05/2007) 227-233 | 10.1520/GTJ100539 | null | physics.class-ph | null | A new experimental set-up using a differential pressure transducer was
developed, that enables the monitoring of volume changes in cyclic triaxial
tests on unsaturated soils. Calibration tests were performed in order to
analyze the performance of the set-up, especially in terms of loading
frequencies. Based on calibration results, a low frequency of 0.05 Hz was
adopted for the tests carried out on the unsaturated loess from northern
France. Five water contents were considered in the tests. The obtained results
have confirmed the efficiency of the new system for volume change monitoring
under cyclic loading. The effect of water content on the cyclic behavior of
loess was clearly evidenced. Finally, some suggestions were made to improve the
accuracy of the system.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 10:43:44 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Cui",
"Yu-Jun",
"",
"ENPC-Cermes"
],
[
"Tang",
"Anh-Minh",
"",
"ENPC-Cermes"
],
[
"Marcial",
"Duilio",
"",
"IMME - Ucv"
],
[
"Terpereau",
"Jean-Marc",
"",
"SNCF"
],
[
"Marchadier",
"Gilles",
"",
"SNCF"
],
[
"Boulay",
"Xavier",
"",
"ENPC-Cermes"
]
] |
0705.4027 | Ayres Freitas | A. Freitas | Radiative corrections to co-annihilation processes | 8pp; version appearing in Phys. Lett. B | Phys.Lett.B652:280-284,2007 | 10.1016/j.physletb.2007.07.019 | ZU-TH 14/07 | hep-ph astro-ph | null | In co-annihilation scenarios, the weakly interacting dark matter particle
(WIMP) is close in mass to another particle that can decay into the WIMP. As a
result, both particles freeze out at roughly the same time in the early
universe, and both contribute to the effective dark matter annihilation
cross-section. Since the heavier particle does not need to be weakly
interacting, the co-annihilation processes are in general subject to sizeable
radiative corrections. Here this is analyzed for the example of neutralino-stop
co-annihilation in supersymmetry. The leading QCD corrections are calculated
and it is found that they have a large effect on the effective annihilation
cross-section, reaching more than 50% in some regions of parameter space.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 10:46:19 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 10:17:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Freitas",
"A.",
""
]
] |
0705.4028 | Faina Shikerman | F.Shikerman, E.Barkai | Photon Statistics for Single Molecule Non-Linear Spectroscopy | null | Phys. Rev. Lett. 99, 208302 (2007) | 10.1103/PhysRevLett.99.208302 | null | physics.optics physics.chem-ph | null | We consider the theory of the non-linear spectroscopy for a single molecule
undergoing stochastic dynamics and interacting with a sequence of two laser
pulses. General expressions for photon counting statistics are obtained, and an
exact solution to the problem of the Kubo-Anderson process is found. In the
limit of impulsive pulses the information on the photon statistics is contained
in the molecule's dipole correlation function. The selective limit where
temporal resolution is maintained, the semi-classical approximation and the
fast modulation limit exhibit general behaviors of this new type of
spectroscopy. We show how the design of the external field leads to rich
insights on dynamics of individual molecules which are different than those
found for an ensemble.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 10:53:11 GMT"
}
] | 2008-01-13T00:00:00 | [
[
"Shikerman",
"F.",
""
],
[
"Barkai",
"E.",
""
]
] |
0705.4029 | Kwei-Chou Yang | Kwei-Chou Yang | Branching Ratios and CP Asymmetries of B \to a_1(1260) \pi and a_1(1260)
K Decays | 20 pages, 1 figure, 4 tables, typos corrected, some discussions
added, version to appear in PRD | Phys.Rev.D76:094002,2007 | 10.1103/PhysRevD.76.094002 | null | hep-ph hep-ex | null | We present the studies of the decays $B\to a_1(1260) \pi$ and $a_1(1260) K$
within the framework of QCD factorization. Due to the G-parity, unlike the
vector meson, the chiral-odd two-parton light-cone distribution amplitudes of
the $a_1$ are antisymmetric under the exchange of quark and anti-quark momentum
fractions in the SU(2) limit. The branching ratios for $a_1 \pi$ modes are
sensitive to tree--penguin interference. The resultant ${\cal B}(B^0 \to
a_1^\pm \pi^\mp)$ are in good agreement with the data. However, using the
current Cabibbo--Kobayashi--Maskawa angles, $\beta=22.0^\circ$ and
$\gamma=59.0^\circ$, our results for the mixing-induced parameter $S$ and
$\alpha_{\rm eff}$ differ from the measurements of the time-dependent CP
asymmetries in the decay $B^0\to a_1^\pm \pi^\mp$ at about the $3.7\sigma$
level. This puzzle may be resolved by using a larger $\gamma \gtrsim 80^\circ$.
For $a_1 K$ modes, the annihilation topologies give sizable contributions and
are sensitive to the first Gegenbauer moment of the leading-twist tensor
(chiral-odd) distribution amplitude of the $a_1$ meson. The $B\to a_1 K$
amplitudes resemble the corresponding $B\to \pi K$ ones very much. Taking the
ratios of corresponding CP-averaged $a_1 K$ and $\pi K$ branching ratios, we
can extract information relevant to the electroweak penguins and annihilations.
The existence of new-physics in the electroweak penguin sector and final state
interactions during decays can thus be explored.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 11:31:44 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Sep 2007 00:24:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yang",
"Kwei-Chou",
""
]
] |
0705.4030 | Beatriz Barbuy Prof | S. Ortolani, B. Barbuy, E. Bica, M. Zoccali, A. Renzini | Distances of the bulge globular clusters Terzan 5, Liller 1, UKS 1 and
Terzan 4 based on HST NICMOS photometry | 8 pages, 7 figures | null | 10.1051/0004-6361:20066628 | null | astro-ph | null | A large number of pulsars and X-rays sources are detected in globular
clusters. To understand the structure and content of these clusters, accurate
distances are required. We derive the distances of Terzan 5, Liller 1 and UKS 1
using as a reference a recent distance determination of NGC 6528, based on
HST/NICMOS and NTT/SOFI infrared photometry. The distance of the metal-poor
cluster Terzan 4 was derived from a comparison with M92 in NICMOS bands.
Distances of the metal-rich clusters are obtained by comparison of the
Horizontal Branch (HB) level of the clusters, relative to the reddening line
passing through the HB of NGC 6528. We use methods based on NICMOS bands and
transformations to J and H magnitudes with different assumptions. Liller~1 and
Terzan~4 are found to be at the central bulge distance, UKS~1 is beyond the
Galactic center, while Terzan 5 is closer to the Sun than the other four
clusters. The distance of Terzan 5 is of paramount importance, given the impact
of its population of 21 pulsars, which is related to the high cluster density.
The distance of Terzan 5 is found to be d$_{\odot}$=5.5$\pm$0.9 kpc from the
Sun, thus closer to us than values given in studies of pulsars in Terzan 5. As
a consequence, the higher cluster density is even more favourable for formation
of the millisecond pulsars recently detected in this cluster.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 11:07:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ortolani",
"S.",
""
],
[
"Barbuy",
"B.",
""
],
[
"Bica",
"E.",
""
],
[
"Zoccali",
"M.",
""
],
[
"Renzini",
"A.",
""
]
] |
0705.4031 | Maxim Zhenirovskyy | A.Snarskii, M.Zhenirovskyy | Dual-Threshold Percolation | null | null | null | null | cond-mat.mtrl-sci | null | For thermoelectric, galvanomagnetic and some other effects there may
simultaneously exist two percolation thresholds, close to which the effective
kinetic coefficients of macroscopically disordered media are critically
dependent on the proximity to percolation thresholds, their behavior being
described by universal critical indexes.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 19:46:47 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 06:18:52 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Snarskii",
"A.",
""
],
[
"Zhenirovskyy",
"M.",
""
]
] |
0705.4032 | Francesco Vissani | G. Pagliaroli, M.L. Costantini, A. Ianni, F. Vissani | The first second of SN1987A neutrino emission | 12 pages, 2 figures | null | null | null | astro-ph | null | A large fraction of SN1987A electron antineutrino events has been recorded in
the first second. We study how this observation fits into the conventional
paradigm for neutrino emission, and show that there is a 3.2 sigma hint for an
initial accretion phase. This phase involves a large fraction of the energy
emitted in neutrinos and antineutrinos, about 20 % or larger. The occurrence of
neutrino oscillations strengthens these inferences. We discuss why three flavor
oscillations with normal mass hierarchy are completely acceptable, whereas
oscillations with inverted mass hierarchy require more troublesome
interpretations, if theta(13) is above 0.5-1 degrees.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 16:11:15 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Pagliaroli",
"G.",
""
],
[
"Costantini",
"M. L.",
""
],
[
"Ianni",
"A.",
""
],
[
"Vissani",
"F.",
""
]
] |
0705.4033 | Julien Tailleur | Julien Tailleur, Jorge Kurchan, Vivien Lecomte | Mapping Nonequilibrium onto Equilibrium: The Macroscopic Fluctuations of
Simple Transport Models | null | Phys. Rev. Lett. 99, 150602 (2007) | 10.1103/PhysRevLett.99.150602 | null | cond-mat.stat-mech math-ph math.MP nlin.SI | null | We study a simple transport model driven out of equilibrium by reservoirs at
the boundaries, corresponding to the hydrodynamic limit of the symmetric simple
exclusion process. We show that a nonlocal transformation of densities and
currents maps the large deviations of the model into those of an open, isolated
chain satisfying detailed balance, where rare fluctuations are the time
reversals of relaxations. We argue that the existence of such a mapping is the
immediate reason why it is possible for this model to obtain an explicit
solution for the large-deviation function of densities through elementary
changes of variables. This approach can be generalized to the other models
previously treated with the macroscopic fluctuation theory.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 11:33:36 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 15:36:00 GMT"
}
] | 2007-12-03T00:00:00 | [
[
"Tailleur",
"Julien",
""
],
[
"Kurchan",
"Jorge",
""
],
[
"Lecomte",
"Vivien",
""
]
] |
0705.4034 | Tom Oosterloo | Tom Oosterloo (Astron; Kapteyn Institute), Filippo Fraternali (Bologna
University), Renzo Sancisi (Osservatorio di Bologna; Kapteyn Institute) | The cold gaseous halo of NGC 891 | Accepted for publication in The Astronomical Journal. High-resolution
version available at http://www.astron.nl/~oosterlo/n891Paper | Astron.J.134:1019-1036,2007 | 10.1086/520332 | null | astro-ph | null | We present HI observations of the edge-on galaxy NGC 891. These are among the
deepest ever performed on an external galaxy. They reveal a huge gaseous halo,
much more extended than seen previously and containing almost 30 % of the HI.
This HI halo shows structures on various scales. On one side, there is a
filament extending (in projection) up to 22 kpc vertically from the disk. Small
(M_HI ~ 10^6 Msol) halo clouds, some with forbidden (apparently
counter-rotating) velocities, are also detected. The overall kinematics of the
halo gas is characterized by differential rotation lagging with respect to that
of the disk. The lag, more pronounced at small radii, increases with height
from the plane. There is evidence that a significant fraction of the halo is
due to a galactic fountain. Accretion from intergalactic space may also play a
role in building up the halo and providing low angular momentum material needed
to account for the observed rotation lag. The long HI filament and the
counter-rotating clouds may be direct evidence of such accretion.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 12:05:05 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Oosterloo",
"Tom",
"",
"Astron; Kapteyn Institute"
],
[
"Fraternali",
"Filippo",
"",
"Bologna\n University"
],
[
"Sancisi",
"Renzo",
"",
"Osservatorio di Bologna; Kapteyn Institute"
]
] |
0705.4035 | Anderson Caproni | Anderson Caproni (Nucleo de Astrofisica Teorica-UNICSUL, IAG/USP,
STScI), Zulema Abraham (IAG/USP), Mario Livio (STScI) and Herman J. Mosquera
Cuesta (ICRA-BR/CBPF) | Is the Bardeen-Petterson effect responsible for the warping and
precession in NGC 4258? | 10 pages, 5 figures, 1 table, accepted for publication in The Monthly
Notices of the Royal Astronomical Society | Mon.Not.Roy.Astron.Soc.379:135-142,2007 | 10.1111/j.1365-2966.2007.11918.x | null | astro-ph | null | Strong evidence for the presence of a warped Keplerian accretion disc in
NGC4258 (M 106) has been inferred from the kinematics of water masers detected
at sub-parsec scales. Assuming a power-law accretion disc and using constraints
on the disc parameters derived from observational data, we have analyzed the
relativistic Bardeen-Petterson effect driven by a Kerr black hole as the
potential physical mechanism responsible for the disc warping. We found that
the Bardeen-Petterson radius is comparable to or smaller than the inner radius
of the maser disc (independent of the allowed value for the black hole spin
parameter). Numerical simulations for a wide range of physical conditions have
shown that the evolution of a misaligned disc due to the Bardeen-Petterson
torques usually produces an inner flat disc and a warped transition region with
a smooth gradient in the tilt and twist angles. Since this structure is similar
to that seen in NGC 4258, we propose that the Bardeen-Petterson effect may be
responsible for the disc warping in this galaxy. We estimated the time-scale
necessary for the disc inside of the Bardeen-Petterson radius to align with the
black hole's equator, as a function of the black hole spin. Our results show
that the Bardeen-Petterson effect can align the disc within a few billion years
in the case of NGC 4258. Finally, we show that if the observed curvature of the
outer anomalous arms in the galactic disc of NGC 4258 is associated with the
precession of its radio jet/counterjet, then the Bardeen-Petterson effect can
provide the required precession period.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 12:12:40 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Caproni",
"Anderson",
"",
"Nucleo de Astrofisica Teorica-UNICSUL, IAG/USP,\n STScI"
],
[
"Abraham",
"Zulema",
"",
"IAG/USP"
],
[
"Livio",
"Mario",
"",
"STScI"
],
[
"Cuesta",
"Herman J. Mosquera",
"",
"ICRA-BR/CBPF"
]
] |
0705.4036 | Alexey Toporensky | A. Toporensky, P. Tretyakov | Certain aspects of regularity in scalar field cosmological dynamics | 15 pages with 4 figures; typos corrected, final version to appear in
Regular and Chaotic Dynamics | null | 10.1134/S1560354707040016 | null | gr-qc nlin.CD | null | We consider dynamics of the FRW Universe with a scalar field. Using
Maupertuis principle we find a curvature of geodesics flow and show that zones
of positive curvature exist for all considered types of scalar field potential.
Usually, phase space of systems with the positive curvature contains islands of
regular motion. We find these islands numerically for shallow scalar field
potentials. It is shown also that beyond the physical domain the islands of
regularity exist for quadratic potentials as well.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 12:27:24 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 16:14:00 GMT"
},
{
"version": "v3",
"created": "Sun, 15 Jul 2007 20:48:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Toporensky",
"A.",
""
],
[
"Tretyakov",
"P.",
""
]
] |
0705.4037 | Silvia Galleti | S. Galleti, M. Bellazzini, L. Federici, A. Buzzoni and F. Fusi Pecci | An updated survey of globular clusters in M31. II Newly discovered
bright and remote clusters | 16 pages including 6 pages published only in the electronic edition
of the Journal. Accepted for publication in A&A | null | 10.1051/0004-6361:20077788 | null | astro-ph | null | We present the first results of a large spectroscopic survey of candidate
globular clusters located in the extreme outskirts of the nearby M31 galaxy. We
obtained low resolution spectra of 48 targets selected from the XSC of 2MASS,
as in Galleti et al. (2005). The observed candidates have been robustly
classified according to their radial velocity and by verifying their
extended/point-source nature from ground-based optical images. Among the 48
observed candidates clusters we found 5 genuine remote globular clusters. One
of them has been already identified independently by Mackey et al. (2007),
their GC1; the other four are completely new discoveries: B516, B517, B518,
B519. The newly discovered clusters lie at projected distance 40 kpc<~R_p<~100
kpc from the center of M31, and have absolute integrated magnitude
-9.5<M_V<-7.5. For all the observed clusters we have measured the strongest
Lick indices and we have obtained spectroscopic metallicity estimates.
Mackey-GC1, Martin-GC1, B517 and B518 have spectra typical of old and metal
poor globular clusters ([Fe/H]<~ -1.3); B519 appears old but quite metal-rich
([Fe/H]~-0.5); B516 presents very strong Balmer absorption lines: if this is
indeed a cluster it should have a relatively young age (likely <2 Gyr). The
present analysis nearly doubles the number of M31 globulars at R_p> 40 kpc. At
odds with the Milky Way, M31 appears to have a significant population of very
bright globular clusters in its extreme outskirts.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 12:30:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Galleti",
"S.",
""
],
[
"Bellazzini",
"M.",
""
],
[
"Federici",
"L.",
""
],
[
"Buzzoni",
"A.",
""
],
[
"Pecci",
"F. Fusi",
""
]
] |
0705.4038 | Michal Kolar | M. Kolar, T. Opatrny, G. Kurizki | Single-photon interferometry with orbital angular momentum circumvents
standard wave-particle duality | 4 pages, 3 figures | null | null | null | quant-ph | null | A polarized photon with well-defined orbital angular momentum that emerges
from a Mach-Zehnder interferometer (MZI) is shown to circumvent wave-particle
duality. Its polarization-resolved detection probability forms a non-sinusoidal
interferometric pattern. For certain phase differences between the MZI arms,
this pattern yields both reliable which-path information and high
phase-sensitivity.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 12:54:16 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Kolar",
"M.",
""
],
[
"Opatrny",
"T.",
""
],
[
"Kurizki",
"G.",
""
]
] |
0705.4039 | Igor Herbut | Igor F. Herbut | SO(3) symmetry between Neel and ferromagnetic order parameters for
graphene in a magnetic field | 5 revtex pages: new figure, new eqs. 20-22, and the discussion of the
experiment of Jiang et al added (v2). Cosmetic changes (v3). Accepted in PRB | Physical Review B, vol. 76, 085432 (2007) | 10.1103/PhysRevB.76.085432 | null | cond-mat.mes-hall cond-mat.str-el | null | I consider the Hubbard model of graphene in an external magnetic field and in
the Hartree-Fock approximation. In the continuum limit, the ground state energy
at half filling becomes nearly symmetric under rotations of the three-component
vector (N1,N2,m), with the first two components representing the Neel order
parameter orthogonal to and the third component the magnetization parallel with
the external magnetic field. When the symmetry breaking effects arising from
the lattice, Zeeman coupling, and higher Landau levels are included the system
develops a quantum critical point at which the antiferromagnetic order
disappears and the magnetization has a kink. The observed incompressible state
at filling factor one is argued to arise due to a finite third component of the
Neel order parameter at these electron densities. Recent experiments appear
consistent with vanishing N1 and N2, and finite N3, at the filling factors zero
and one, respectively.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 12:54:27 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 22:47:31 GMT"
},
{
"version": "v3",
"created": "Fri, 17 Aug 2007 20:17:47 GMT"
}
] | 2007-08-27T00:00:00 | [
[
"Herbut",
"Igor F.",
""
]
] |
0705.4040 | Cenap Ates | Cenap Ates, Thomas Pohl, Thomas Pattard and Jan M. Rost | Many-body theory of excitation dynamics in an ultracold Rydberg gas | 12 pages, 8 figures | null | 10.1103/PhysRevA.76.013413 | null | physics.atom-ph | null | We develop a theoretical approach for the dynamics of Rydberg excitations in
ultracold gases, with a realistically large number of atoms. We rely on the
reduction of the single-atom Bloch equations to rate equations, which is
possible under various experimentally relevant conditions. Here, we explicitly
refer to a two-step excitation-scheme. We discuss the conditions under which
our approach is valid by comparing the results with the solution of the exact
quantum master equation for two interacting atoms. Concerning the emergence of
an excitation blockade in a Rydberg gas, our results are in qualitative
agreement with experiment. Possible sources of quantitative discrepancy are
carefully examined. Based on the two-step excitation scheme, we predict the
occurrence of an antiblockade effect and propose possible ways to detect this
excitation enhancement experimentally in an optical lattice as well as in the
gas phase.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 13:01:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ates",
"Cenap",
""
],
[
"Pohl",
"Thomas",
""
],
[
"Pattard",
"Thomas",
""
],
[
"Rost",
"Jan M.",
""
]
] |
0705.4041 | Claude Dion | H. Hagman, C. M. Dion, P. Sjolund, S. J. H. Petra and A. Kastberg | Influence of the lattice topography on a three-dimensional, controllable
Brownian motor | null | Europhysics Letters 81, 33001 (2008) | 10.1209/0295-5075/81/33001 | null | physics.atom-ph | null | We study the influence of the lattice topography and the coupling between
motion in different directions, for a three-dimensional Brownian motor based on
cold atoms in a double optical lattice. Due to controllable relative spatial
phases between the lattices, our Brownian motor can induce drifts in arbitrary
directions. Since the lattices couple the different directions, the relation
between the phase shifts and the directionality of the induced drift is non
trivial. Here is therefore this relation investigated experimentally by
systematically varying the relative spatial phase in two dimensions, while
monitoring the vertically induced drift and the temperature. A relative spatial
phase range of 2pi x 2pi is covered. We show that a drift, controllable both in
speed and direction, can be achieved, by varying the phase both parallel and
perpendicular to the direction of the measured induced drift. The experimental
results are qualitatively reproduced by numerical simulations of a simplified,
classical model of the system.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 13:05:22 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 15:15:55 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Hagman",
"H.",
""
],
[
"Dion",
"C. M.",
""
],
[
"Sjolund",
"P.",
""
],
[
"Petra",
"S. J. H.",
""
],
[
"Kastberg",
"A.",
""
]
] |
0705.4042 | Martin Evans | A. G. Angel, M. R. Evans, E. Levine and D. Mukamel | Criticality and Condensation in a Non-Conserving Zero Range Process | 15 pages, 4 figure, published versio | J. Stat. Mech. (2007) P08017 | 10.1088/1742-5468/2007/08/P08017 | null | cond-mat.stat-mech | null | The Zero-Range Process, in which particles hop between sites on a lattice
under conserving dynamics, is a prototypical model for studying real-space
condensation. Within this model the system is critical only at the transition
point. Here we consider a non-conserving Zero-Range Process which is shown to
exhibit generic critical phases which exist in a range of creation and
annihilation parameters. The model also exhibits phases characterised by
mesocondensates each of which contains a subextensive number of particles. A
detailed phase diagram, delineating the various phases, is derived.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 13:21:23 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 09:22:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Angel",
"A. G.",
""
],
[
"Evans",
"M. R.",
""
],
[
"Levine",
"E.",
""
],
[
"Mukamel",
"D.",
""
]
] |
0705.4043 | Gilles Esposito-Farese | Jean-Philippe Bruneton and Gilles Esposito-Farese | Field-theoretical formulations of MOND-like gravity | 66 pages, 6 figures, RevTeX4 format, version reflecting the changes
in the published paper | Phys.Rev.D76:124012,2007; Erratum-ibid.D76:129902,2007 | 10.1103/PhysRevD.76.124012 10.1103/PhysRevD.76.129902 | null | gr-qc | null | Modified Newtonian dynamics (MOND) is a possible way to explain the flat
galaxy rotation curves without invoking the existence of dark matter. It is
however quite difficult to predict such a phenomenology in a consistent field
theory, free of instabilities and admitting a well-posed Cauchy problem. We
examine critically various proposals of the literature, and underline their
successes and failures both from the experimental and the field-theoretical
viewpoints. We exhibit new difficulties in both cases, and point out the hidden
fine tuning of some models. On the other hand, we show that several published
no-go theorems are based on hypotheses which may be unnecessary, so that the
space of possible models is a priori larger. We examine a new route to
reproduce the MOND physics, in which the field equations are particularly
simple outside matter. However, the analysis of the field equations within
matter (a crucial point which is often forgotten in the literature) exhibits a
deadly problem, namely that they do not remain always hyperbolic. Incidentally,
we prove that the same theoretical framework provides a stable and well-posed
model able to reproduce the Pioneer anomaly without spoiling any of the
precision tests of general relativity. Our conclusion is that all MOND-like
models proposed in the literature, including the new ones examined in this
paper, present serious difficulties: Not only they are unnaturally fine tuned,
but they also fail to reproduce some experimental facts or are unstable or
inconsistent as field theories. However, some frameworks, notably the
tensor-vector-scalar (TeVeS) one of Bekenstein and Sanders, seem more promising
than others, and our discussion underlines in which directions one should try
to improve them.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 13:28:31 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Nov 2007 16:35:14 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Bruneton",
"Jean-Philippe",
""
],
[
"Esposito-Farese",
"Gilles",
""
]
] |
0705.4044 | Hung The Diep | X. T. Pham Phu, V. Thanh Ngo and H. T. Diep | Nature of phase transition in magnetic thin films | 8 pages, 17 figures, submitted to Phys. Rev. B | Surface Science 603, 109 (2009) | 10.1016/j.susc.2008.10.037 | null | cond-mat.mtrl-sci cond-mat.stat-mech | null | We study the critical behavior of magnetic thin films as a function of the
film thickness. We use the ferromagnetic Ising model with the high-resolution
multiple histogram Monte Carlo (MC) simulation. We show that though the 2D
behavior remains dominant at small thicknesses, there is a systematic
continuous deviation of the critical exponents from their 2D values. We observe
that in the same range of varying thickness the deviation of the exponent $\nu$
is very small from its 2D value, while exponent $\beta$ suffers a larger
deviation. Moreover, as long as the film thickness is fixed, i. e. no finite
size scaling is done in the $z$ direction perpendicular to the film, the 3D
values of the critical exponents cannot be attained even with very large (but
fixed) thickness. The crossover to 3D universality class cannot therefore take
place without finite size scaling applied in the $z$ direction, in the limit of
numerically accessible thicknesses. From values of exponent $\alpha$ obtained
by MC, we estimate the effective dimension of the system. We conclude that with
regard to the critical behavior, thin films behave as systems with effective
dimension between 2 and 3.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 13:42:07 GMT"
}
] | 2015-09-21T00:00:00 | [
[
"Phu",
"X. T. Pham",
""
],
[
"Ngo",
"V. Thanh",
""
],
[
"Diep",
"H. T.",
""
]
] |
0705.4045 | Thomas Eccardt | Thomas M. Eccardt | The use of the logarithm of the variate in the calculation of
differential entropy among certain related statistical distributions | 9 pages, one table | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper demonstrates that basic statistics (mean, variance) of the
logarithm of the variate itself can be used in the calculation of differential
entropy among random variables known to be multiples and powers of a common
underlying variate. For the same set of distributions, the variance of the
differential self-information is shown also to be a function of statistics of
the logarithmic variate. Then entropy and its "variance" can be estimated using
only statistics of the logarithmic variate plus constants, without reference to
the traditional parameters of the variate.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 13:45:56 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Dec 2008 18:11:39 GMT"
},
{
"version": "v3",
"created": "Mon, 26 Jan 2009 03:36:42 GMT"
}
] | 2009-01-26T00:00:00 | [
[
"Eccardt",
"Thomas M.",
""
]
] |
0705.4046 | Guray Erkol | G. Erkol and M. Oka | Meson-baryon sigma terms in QCD Sum Rules | 14 pages, 2 figures; extended discussion and added references;
version to be published in Phys. Lett. B | Phys.Lett.B659:176-183,2008 | 10.1016/j.physletb.2007.11.060 | null | hep-ph | null | We evaluate the pion-nucleon and the pion-Delta sigma terms by employing the
method of quantum chromodynamics (QCD) sum rules. The obtained value of the
pion-nucleon sigma term is compatible with the larger values already
anticipated by the recent calculations. It is also found that the pion-Delta
sigma term is as large as the pion-nucleon sigma term.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 13:52:58 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Nov 2007 11:24:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Erkol",
"G.",
""
],
[
"Oka",
"M.",
""
]
] |
0705.4047 | Thomas Tucker J | Dragos Ghioca, Thomas J. Tucker | p-adic logarithms for polynomial dynamics | 11 pages. The results of this preprint have been subsumed by those of
the authors' more recent preprint "Periodic points, linearizing maps, and the
dynamical Mordell-Lang problem" (arXiv:0805.1560v1) | null | null | null | math.NT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a dynamical version of the Mordell-Lang conjecture for subvarieties
of the affine space A^g over a p-adic field, endowed with polynomial actions on
each coordinate of A^g. We use analytic methods similar to the ones employed by
Skolem, Chabauty, and Coleman for studying diophantine equations.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:00:10 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jun 2008 20:10:10 GMT"
}
] | 2008-06-24T00:00:00 | [
[
"Ghioca",
"Dragos",
""
],
[
"Tucker",
"Thomas J.",
""
]
] |
0705.4048 | Ben Weinkove | D.H. Phong, Jian Song, Jacob Sturm, Ben Weinkove | The K\"ahler-Ricci flow and the $\bar\partial$ operator on vector fields | 16 pages. Final version, to appear in J. Differential Geometry | J. Differential Geom. 81 (2009), no. 3, 631-647 | null | null | math.DG math.CV | null | The limiting behavior of the normalized K\"ahler-Ricci flow for manifolds
with positive first Chern class is examined under certain stability conditions.
First, it is shown that if the Mabuchi K-energy is bounded from below, then the
scalar curvature converges uniformly to a constant. Second, it is shown that if
the Mabuchi K-energy is bounded from below and if the lowest positive
eigenvalue of the $\bar\partial^\dagger \bar\partial$ operator on smooth vector
fields is bounded away from 0 along the flow, then the metrics converge
exponentially fast in $C^\infty$ to a K\"ahler-Einstein metric.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:06:38 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 02:18:07 GMT"
}
] | 2018-12-20T00:00:00 | [
[
"Phong",
"D. H.",
""
],
[
"Song",
"Jian",
""
],
[
"Sturm",
"Jacob",
""
],
[
"Weinkove",
"Ben",
""
]
] |
0705.4049 | Domenico Ditto | A.Orefice, R.Giovanelli, D.Ditto | Beyond Geometrical Optics and Bohmian Physics: A New Exact and
Deterministic Hamiltonian Approach to Wave-Like Features in Classical and
Quantum Physics | 18 pages, including 4 figures in separate pages | null | null | null | quant-ph | null | The indeterministic character of physical laws is generally considered to be
the most important consequence of quantum physics. A deterministic point of
view, however, together with the possibility of well defined Hamiltonian
trajectories, emerges as the most natural one from the analysis of the
time-independent Helmholtz-like equations encountered both in Classical
Electromagnetism and in Wave Mechanics. In the case of particle beams a
suitable pattern of trajectories is provided (for any set of boundary
conditions) by a set of dynamical laws containing the classical ones as a
simple limiting case.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:07:41 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Orefice",
"A.",
""
],
[
"Giovanelli",
"R.",
""
],
[
"Ditto",
"D.",
""
]
] |
0705.4050 | J. R. S. Nascimento | M. Gomes, T. Mariz, J. R. Nascimento, A. Yu. Petrov, A. J. da Silva,
and E. O. Silva | Anomaly cancellation in three-dimensional noncommutative gauge theories | 11 pages, accepted to Phys. Lett. B | Phys.Lett.B656:145-151,2007 | 10.1016/j.physletb.2007.09.011 | null | hep-th hep-ph math-ph math.MP | null | The anomaly found by Callan and Harvey is shown to be cancelled in a
three-dimensional noncommutative gauge theory coupled to a fermion with a mass
function depending on one spatial coordinate (domain wall mass). This
evaluation has been done for the fermion in the fundamental and adjoint
representations of the gauge group in the limit of small noncommutativity
$\theta$ parameter.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:16:19 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 14:06:15 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Sep 2007 18:33:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gomes",
"M.",
""
],
[
"Mariz",
"T.",
""
],
[
"Nascimento",
"J. R.",
""
],
[
"Petrov",
"A. Yu.",
""
],
[
"da Silva",
"A. J.",
""
],
[
"Silva",
"E. O.",
""
]
] |
0705.4051 | Shigeru Kubono | S. Kubono | Experimental Approach to Stellar Reactions with RI Beams - Overview of
Experiments on Hydrogen Burning - | null | null | null | null | nucl-ex | null | After a short review on resent developments achieved in astrophysics in the
past years since last NN conference, experimental efforts in nuclear
astrophysics primarily with RI beams were revisited, especially on the works
relevant to neutron-deficient nuclei, the other half of the nuclear chart
reviewed by Rehm in this conference. A new interesting recognition discussed in
the past years is the important role of explosive hydrogen burning process in
the very early stage of type II supernovae. A new broadening research field
related to the first generation stars both from observations as well as from
nuclear astrophysics was also discussed.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:02:28 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Kubono",
"S.",
""
]
] |
0705.4052 | Lingyi Xiao | M. X. Su and L. Y. Xiao | Calculations of ${\cal O}(p^6)$ Resonance Coupling Constants in the
Scalar Sector of the ENJL Model | 7 pages | Commun.Theor.Phys.49:1275-1278,2008 | 10.1088/0253-6102/49/5/41 | null | hep-ph | null | We derive the scalar resonance coupling constants of resonance chiral theory
from the Extended Nambu Jona-Lasinio model by using heat-kernel expansion.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 14:57:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Su",
"M. X.",
""
],
[
"Xiao",
"L. Y.",
""
]
] |
0705.4053 | Wolfgang Kausch | W. Kausch (1), M. Gitti (2), T. Erben (3), and S. Schindler (1) ((1)
Institute for Astro- and Particlephysics, Univ. of Innsbruck, Austria (2)
INAF - Osservatorio Astronomico di Bologna, Italy, (3) Argelander-Institut
(AIfA), University of Bonn, Germany) | ARCRAIDER I: Detailed optical and X-ray analysis of the cooling flow
cluster Z3146 | accepted by A&A; 23 pages, 28 figures, 6 tables; High resolution
version can be found here:
http://astro.uibk.ac.at/~w.kausch/Z3146_astroph_hires.pdf.gz | null | 10.1051/0004-6361:20054413 | null | astro-ph | null | We present a detailed analysis of the medium redshift (z=0.2906) galaxy
cluster Z3146 which is part of the ongoing ARCRAIDER project, a systematic
search for gravitational arcs in massive clusters of galaxies. The analysis of
Z3146 is based on deep optical wide field observations in the B, V and R bands
obtained with the [email protected], and shallow archival WFPC2@HST taken with the
F606W filter, which are used for strong as well as weak lensing analyses.
Additionally we have used publicly available XMM/Newton observations for a
detailed X-ray analysis of Z3146. Both methods, lensing and X-ray, were used to
determine the dynamical state and to estimate the total mass. We also
identified four gravitational arc candidates. We find this cluster to be in a
relaxed state, which is confirmed by a large cooling flow with nominal
~1600M_\odot per year, regular galaxy density and light distributions and a
regular shape of the weak lensing mass reconstruction. The mass content derived
with the different methods agrees well within 25% at r_{200}=1661
h_{70}^{-1}kpc indicating a velocity dispersion of
\sigma_v=869^{+124}_{-153}km/s.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:06:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kausch",
"W.",
""
],
[
"Gitti",
"M.",
""
],
[
"Erben",
"T.",
""
],
[
"Schindler",
"S.",
""
]
] |
0705.4054 | John Franks | John Franks | Distortion in Groups of Circle and Surface Diffeomorphisms | null | Panoramas et Synth`eses, Soc. Math.de France {\bf 21} (2006) 35-52 | null | null | math.DS | null | In these lectures we consider how algebraic properties of discrete subgroups
of Lie groups restrict the possible actions of those groups on surfaces. The
results show a strong parallel between the possible actions of such a group on
the circle $S^1$ and the measure preserving actions on surfaces.
Our aim is the study of the (non)-existence of actions of lattices in a large
class of non-compact Lie groups on surfaces. A definitive analysis of the
analogous question for actions on $S^1$ was carried out by \'E. Ghys. Our
approach is topological and insofar as possible we try to isolate properties of
a group which provide the tools necessary for our analysis. The two key
properties we consider are almost simplicity and the existence of a distortion
element. Both will be defined and described in the lectures.
Our techniques are almost all from low dimensional dynamics. But we are
interested in how algebraic properties of a group -- commutativity, nilpotence,
etc. affect the possible kinds of dynamics which can occur. For most of the
results we will consider groups of diffeomorphisms which preserve a Borel
probability measure.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:23:53 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Franks",
"John",
""
]
] |
0705.4055 | Filippo Maimone | Vinicio Pelino and Filippo Maimone | Energetics, skeletal dynamics and long-term predictions in
Kolmogorov-Lorenz systems | 21 pages, 14 figures | Phys. Rev. E 76, 046214 (2007) | 10.1103/PhysRevE.76.046214 | null | nlin.CD | null | We study a particular return map for a class of low dimensional chaotic
models called Kolmogorov Lorenz systems, which received an elegant general
Hamiltonian description and includes also the famous Lorenz63 case, from the
viewpoint of energy and Casimir balance. In particular it is considered in
detail a subclass of these models, precisely those obtained from the Lorenz63
by a small perturbation on the standard parameters, which includes for example
the forced Lorenz case in Ref.[6]. The paper is divided into two parts. In the
first part the extremes of the mentioned state functions are considered, which
define an invariant manifold, used to construct an appropriate Poincare surface
for our return map. From the experimental observation of the simple orbital
motion around the two unstable fixed points, together with the circumstance
that these orbits are classified by their energy or Casimir maximum, we
construct a conceptually simple skeletal dynamics valid within our sub class,
reproducing quite well the Lorenz map for Casimir. This energetic approach
sheds some light on the physical mechanism underlying regime transitions. The
second part of the paper is devoted to the investigation of a new type of
maximum energy based long term predictions, by which the knowledge of a
particular maximum energy shell amounts to the knowledge of the future
(qualitative) behaviour of the system. It is shown that, in this respect, a
local analysis of predictability is not appropriate for a complete
characterization of this behaviour. A perspective on the possible extensions of
this type of predictability analysis to more realistic cases in (geo)fluid
dynamics is discussed at the end of the paper.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:16:19 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Pelino",
"Vinicio",
""
],
[
"Maimone",
"Filippo",
""
]
] |
0705.4056 | Michael Schmitt | Sven Heinemeyer (1), Yonatan Kahn (2), Michael Schmitt (2), Mayda
Velasco (2) ((1) Instituto de Fisica de Cantabria, (2) Northwestern
University) | An Experiment to Search for Light Dark Matter in Low-Energy ep
Scattering | plain latex, 26 pages, 12 figures. References updated, some points of
the discussion improved | null | null | NUHEP-EXP/07-01 | hep-ex astro-ph hep-ph | null | Anomalous production of low-energy photons from the galactic center have
fueled speculations on the nature and properties of dark matter particles. In
particular, it has been proposed that light scalars may be responsible for the
bulk of the matter density of the universe, and that they couple to ordinary
matter through a light spin-1 boson. If this is the case, then such particles
may be produced in the quasi-elastic low-energy scattering of electrons off
protons. We present a proposal for an experiment to search for this process and
assess its viability.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:17:20 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Dec 2007 23:22:41 GMT"
}
] | 2007-12-13T00:00:00 | [
[
"Heinemeyer",
"Sven",
""
],
[
"Kahn",
"Yonatan",
""
],
[
"Schmitt",
"Michael",
""
],
[
"Velasco",
"Mayda",
""
]
] |
0705.4057 | Artur Lopes O. | Artur O. Lopes and M. Sebastiani | Poncelet pairs and the Twist Map associated to the Poncelet Billiard | null | null | null | null | math.DS math-ph math.MP | null | We show that for a fixed curve $K$ and for a family of variables curves $L$,
the number of $n$-Poncelet pairs is $\frac{e (n)}{2}$, where $e(n)$ is the
number of natural numbers $m$ smaller than $n$ and which satisfies mcd $
(m,n)=1$. The curvee $K$ do not have to be part of the family.
In order to show this result we consider an associated billiard
transformation and a twist map which preserves area.
We use Aubry-Mather theory and the rotation number of invariant curves to
obtain our main result.
In the last section we estimate the derivative of the rotation number of a
general twist map using some properties of the continued fraction expansion .
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:36:39 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 18:19:27 GMT"
}
] | 2008-03-17T00:00:00 | [
[
"Lopes",
"Artur O.",
""
],
[
"Sebastiani",
"M.",
""
]
] |
0705.4058 | Leonid Friedlander | Leonid Friedlander, Michael Solomyak | On the Spectrum of the Dirichlet Laplacian in a Narrow Strip | 17 pages | null | null | null | math.SP | null | We derive a two-terms asymptotics for eigenvalues of the Dirichlet Laplacian
in a narrow strip of variable width. The asymptotics is taken with respect to a
small paprameter that characterizes the width of the strip.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:55:09 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Friedlander",
"Leonid",
""
],
[
"Solomyak",
"Michael",
""
]
] |
0705.4059 | Alejandra Melfo | Alejandra Melfo | Grand Unification with and without Supersymmetry | Talk given at the VI SILAFAE, Puerto Vallarta, Mexico, November 2006 | AIPConf.Proc.917:252-259,2007 | 10.1063/1.2751964 | null | hep-ph | null | Grand Unified Theories based on the group SO(10) generically provide
interesting and testable relations between the charged fermions and neutrino
sector masses and mixings. In the light of the recent neutrino data, we
reexamine these relations both in supersymmetric and non-supersymmetric models,
and give a brief review of their present status.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:56:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Melfo",
"Alejandra",
""
]
] |
0705.4060 | Artur O. Lopes | Ruy Exel and Artur O. Lopes | C*- Algebras and Thermodynamic Formalism | version updated in 2021 | null | null | null | math.DS math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed exposition (for a Dynamical System audience) of the
content of the paper: R. Exel and A. Lopes, $C^*$ Algebras, approximately
proper equivalence relations and Thermodynamic Formalism, {\it Erg. Theo. and
Dyn. Syst.}, Vol 24, pp 1051-1082 (2004). We show only the uniqueness of the
\beta-KMS (in a certain C*-Algebra obtained from the operators acting in $L^2$
of a Gibbs invariant probability $\mu$) and its relation with the
eigen-probability $\nu_\beta$ for the dual of a certain Ruele operator. We
consider an example for a case of Hofbauer type where there exist a Phase
transition for the Gibbs state. There is no Phase transition for the KMS state.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:57:34 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Jul 2015 11:46:06 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Oct 2021 13:10:28 GMT"
}
] | 2021-10-14T00:00:00 | [
[
"Exel",
"Ruy",
""
],
[
"Lopes",
"Artur O.",
""
]
] |
0705.4061 | Alessandra Galli | A. Galli (1,2,3), L. Piro (1) ((1) IASF-Roma/INAF, (2) Univerisita' di
Roma "La Sapienza", (3) INFN-Trieste) | High energy afterglows and flares from Gamma-Ray Burst by Inverse
Compton emission | 16 pages, 15 figures, typos corrected, accepted for pubblication in
A&A | Astron.Astrophys.475:421-434,2007 | 10.1051/0004-6361:20077954 | null | astro-ph | null | We perform a detailed study of inverse Compton (IC) emission for a fireball
undergoing external shock (ES) in either a uniform or a wind-like interstellar
medium, and assess the relative importance of IC and synchrotron emissions. We
determine the primary model parameters driving the IC to synchrotron emission
ratio in the case of a short duration central engine. We then investigate the
case of ES by a long duration central engine, or delayed external shock (DES),
a model that can account for some of the flares observed in GRB X-ray light
curves. We present model predictions, in particular in terms of GeV vs X-ray
behavior, and compare them with other models proposed to explain the origin of
flares. We find that if most of the emission occurs when the fireball is in the
fast cooling regime, then a substantial GeV emission is expected both for a
short (standard ES) and a long (DES) duration central engine activity. In
particular, in the context of standard ES we are able to account for the
delayed emission observed in GRB940217. In the case of DES, we find that IC
scattering of X-ray flare photons can produce high energy flares in the GeV
band, which can be detected by GLAST. The detectability of high energy flares
improves with the burst kinetic energy: about 30% of Swift GRBs showing flares
in their X-ray light curve have sufficiently large kinetic energy so that the
expected high flares can be detected by GLAST. One important prediction of the
DES model is the simultaneity between low and high energy flares. To test this
simultaneity, the peak energies of both flares need to fall below or within the
observational bands. We predict that X-ray flares with peak energy of ~10 eV
produce high energy flares with peak energy of around 100 MeV-GeV. Observations
by Swift and GLAST then, can test the predicted simultaneity.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 15:59:35 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 17:17:44 GMT"
},
{
"version": "v3",
"created": "Fri, 28 Sep 2007 09:36:41 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Galli",
"A.",
""
],
[
"Piro",
"L.",
""
]
] |
0705.4062 | Eugene Shakhnovich | Konstantin Zeldovich, Peiqiu Chen, Eugene Shakhnovich | The Hypercube of Life: How Protein Stability Imposes Limits on Organism
Complexity and Speed of Molecular Evolution | null | null | null | null | q-bio.BM q-bio.PE | null | Classical population genetics a priori assigns fitness to alleles without
considering molecular or functional properties of proteins that these alleles
encode. Here we study population dynamics in a model where fitness can be
inferred from physical properties of proteins under a physiological assumption
that loss of stability of any protein encoded by an essential gene confers a
lethal phenotype. Accumulation of mutations in organisms containing Gamma genes
can then be represented as diffusion within the Gamma dimensional hypercube
with adsorbing boundaries which are determined, in each dimension, by loss of a
protein stability and, at higher stability, by lack of protein sequences.
Solving the diffusion equation whose parameters are derived from the data on
point mutations in proteins, we determine a universal distribution of protein
stabilities, in agreement with existing data. The theory provides a fundamental
relation between mutation rate, maximal genome size and thermodynamic response
of proteins to point mutations. It establishes a universal speed limit on rate
of molecular evolution by predicting that populations go extinct (via lethal
mutagenesis) when mutation rate exceeds approximately 6 mutations per essential
part of genome per replication for mesophilic organisms and 1 to 2 mutations
per genome per replication for thermophilic ones. Further, our results suggest
that in absence of error correction, modern RNA viruses and primordial genomes
must necessarily be very short. Several RNA viruses function close to the
evolutionary speed limit while error correction mechanisms used by DNA viruses
and non-mutant strains of bacteria featuring various genome lengths and
mutation rates have brought these organisms universally about 1000 fold below
the natural speed limit.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 16:00:37 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Zeldovich",
"Konstantin",
""
],
[
"Chen",
"Peiqiu",
""
],
[
"Shakhnovich",
"Eugene",
""
]
] |
0705.4063 | Thomas H. Otway | Thomas H. Otway | Comment on "Removable singularities for solutions of coupled
Yang-Mills-Dirac equations" [J. Math. Phys. 47, 103502 (2006)] | 3 pages | J.Math.Phys.48:074101,2007 | 10.1063/1.2752011 | null | math-ph math.AP math.MP | null | A lemma from elliptic theory is used to improve a recent result by Li
concerning the removability of an isolated point singularity from solutions of
the coupled Yang-Mills-Dirac equations.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 16:00:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Otway",
"Thomas H.",
""
]
] |
0705.4064 | Antoine Meyer | Antoine Meyer (LIAFA) | On Term Rewriting Systems Having a Rational Derivation | null | Foundations of Software Science and Computation Structures
(05/03/2004) 378-392 | 10.1007/b95995 | null | cs.LO | null | Several types of term rewriting systems can be distinguished by the way their
rules overlap. In particular, we define the classes of prefix, suffix,
bottom-up and top-down systems, which generalize similar classes on words. Our
aim is to study the derivation relation of such systems (i.e. the reflexive and
transitive closure of their rewriting relation) and, if possible, to provide a
finite mechanism characterizing it. Using a notion of rational relations based
on finite graph grammars, we show that the derivation of any bottom-up,
top-down or suffix systems is rational, while it can be non recursive for
prefix systems.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 16:30:27 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Meyer",
"Antoine",
"",
"LIAFA"
]
] |
0705.4065 | Pierre Kervella | Pierre Kervella (LESIA), Paulo J. V. Garcia (CAUP) | Preparing an ESO proposal | 13 pages, to be published in the Proceedings of the 2006 Euro Summer
School "Observation and Data Reduction with the VLTI", 4-16 June 2006,
Goutelas (France), http://vltischool.obs.ujf-grenoble.fr/ | New Astron.Rev.51:658-665,2007 | 10.1016/j.newar.2007.04.006 | null | astro-ph | null | Preparing observing proposals is a classical exercise in an observational
astronomer's life. In this paper, we summarize the general requirements to
write a good proposal for the ESO telescopes, and eventually obtain telescope
time. We detail in particular the different proposal types, how they are
evaluated by ESO, what they should contain and what to avoid. The advice given
in the present paper are applicable to observing proposals for the AMBER and
MIDI instruments of the VLTI, but also to other ESO instruments, and to some
extent to other observatories.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 16:32:17 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Kervella",
"Pierre",
"",
"LESIA"
],
[
"Garcia",
"Paulo J. V.",
"",
"CAUP"
]
] |
0705.4066 | Andrzej Krasi\'nski | Andrzej Krasi\'nski and Krzysztof Bolejko | Can a charged dust ball be sent through the Reissner--Nordstr\"{o}m
wormhole? | 30 pages, 21 figures; several corrections after referee's comments, 4
figures modified | Phys.Rev.D76:124013,2007 | 10.1103/PhysRevD.76.124013 | null | gr-qc | null | In a previous paper we formulated a set of necessary conditions for the
spherically symmetric weakly charged dust to avoid Big Bang/Big Crunch, shell
crossing and permanent central singularities. However, we did not discuss the
properties of the energy density, some of which are surprising and seem not to
have been known up to now. A singularity of infinite energy density does exist
-- it is a point singularity situated on the world line of the center of
symmetry. The condition that no mass shell collapses to $R = 0$ if it had $R >
0$ initially thus turns out to be still insufficient for avoiding a
singularity. Moreover, at the singularity the energy density $\epsilon$ is
direction-dependent: $\epsilon \to - \infty$ when we approach the singular
point along a $t =$ const hypersurface and $\epsilon \to + \infty$ when we
approach that point along the center of symmetry. The appearance of
negative-energy-density regions turns out to be inevitable. We discuss various
aspects of this property of our configuration. We also show that a permanently
pulsating configuration, with the period of pulsation independent of mass, is
possible only if there exists a permanent central singularity.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 16:55:39 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 11:37:36 GMT"
},
{
"version": "v3",
"created": "Wed, 31 Oct 2007 12:58:43 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Krasiński",
"Andrzej",
""
],
[
"Bolejko",
"Krzysztof",
""
]
] |
0705.4067 | Sandy Irani | Sandy Irani | The Complexity of Quantum Systems on a One-dimensional Chain | This paper has been merged with arXiv:0705.4077 and is now
co-authored with Dorit Aharonov, Daniel Gottesman, and Julia Kempe. Ther
version posted here is the same as the original version | null | null | null | quant-ph | null | We prove that adiabatic computation is equivalent to standard quantum
computation even when the adiabatic quantum system is restricted to be a set of
particles on a one-dimensional chain. We give a construction that uses a
2-local Hamiltonian on nearest neighbors using particles that can have ten
distinct states. This implies a construction of a one-dimensional chain of
qubits in which the Hamiltonian is 6-local. We adapt this construction to show
that the 2-local Hamiltonian for 13-state particles is QMA-complete which in
turn implies that the 8-local Hamiltonian restricted to a one-dimensional chain
of qubits is QMA-complete.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:16:53 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 15:46:28 GMT"
}
] | 2008-02-19T00:00:00 | [
[
"Irani",
"Sandy",
""
]
] |
0705.4068 | Jiawang Nie | J. William Helton, Jiawang Nie | Semidefinite Representation of Convex Sets | The third version, 32 pages | null | null | null | math.OC math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $S =\{x\in \re^n: g_1(x)\geq 0, ..., g_m(x)\geq 0\}$ be a semialgebraic
set defined by multivariate polynomials $g_i(x)$. Assume $S$ is convex, compact
and has nonempty interior. Let $S_i =\{x\in \re^n: g_i(x)\geq 0\}$, and $\bdS$
(resp. $\bdS_i$) be the boundary of $S$ (resp. $S_i$). This paper discusses
whether $S$ can be represented as the projection of some LMI representable set.
Such $S$ is called semidefinite representable or SDP representable. The
contributions of this paper: {\bf (i)} Assume $g_i(x)$ are all concave on $S$.
If the positive definite Lagrange Hessian (PDLH) condition holds, i.e., the
Hessian of the Lagrange function for optimization problem of minimizing any
nonzero linear function $\ell^Tx$ on $S$ is positive definite at the minimizer,
then $S$ is SDP representable. {\bf (ii)} If each $g_i(x)$ is either
sos-concave ($-\nabla^2g_i(x)=W(x)^TW(x)$ for some possibly nonsquare matrix
polynomial $W(x)$) or strictly quasi-concave on $S$, then $S$ is SDP
representable. {\bf (iii)} If each $S_i$ is either sos-convex or poscurv-convex
($S_i$ is compact convex, whose boundary has positive curvature and is
nonsingular, i.e. $\nabla g_i(x) \not = 0$ on $\bdS_i \cap S$), then $S$ is SDP
representable. This also holds for $S_i$ for which $\bdS_i \cap S$ extends
smoothly to the boundary of a poscurv-convex set containing $S$. {\bf (iv)} We
give the complexity of Schm\"{u}dgen and Putinar's matrix Positivstellensatz,
which are critical to the proofs of (i)-(iii).
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 16:53:00 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 15:45:15 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Jan 2008 18:10:25 GMT"
},
{
"version": "v4",
"created": "Wed, 23 Apr 2008 07:20:15 GMT"
},
{
"version": "v5",
"created": "Mon, 21 Jul 2008 06:19:39 GMT"
}
] | 2008-07-21T00:00:00 | [
[
"Helton",
"J. William",
""
],
[
"Nie",
"Jiawang",
""
]
] |
0705.4069 | Robert Roth | R. Roth, P. Navratil | Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model | 4 pages, 5 figures, 1 table | Phys.Rev.Lett.99:092501,2007 | 10.1103/PhysRevLett.99.071302 | UCRL-JRNL-231224 | nucl-th | null | We propose an importance truncation scheme for the no-core shell model, which
enables converged calculations for nuclei well beyond the p-shell. It is based
on an a priori measure for the importance of individual basis states
constructed by means of many-body perturbation theory. Only the physically
relevant states of the no-core model space are considered, which leads to a
dramatic reduction of the basis dimension. We analyze the validity and
efficiency of this truncation scheme using different realistic nucleon-nucleon
interactions and compare to conventional no-core shell model calculations for
4He and 16O. Then, we present the first converged calculations for the ground
state of 40Ca within no-core model spaces including up to
16\hbar\Omega-excitations using realistic low-momentum interactions. The scheme
is universal and can be easily applied to other quantum many-body problems.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:02:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Roth",
"R.",
""
],
[
"Navratil",
"P.",
""
]
] |
0705.4070 | Joao Pulido | Marco Picariello, Jo\~ao Pulido, S. Andringa, N.F. Barros, J. Maneira | SNO+: predictions from standard solar models and spin flavour precession | 20 pages. Sections 1 and 2 extended, section 4.4 added, references
added and updated. Final version to be published in JHEP | JHEP0711:055,2007 | 10.1088/1126-6708/2007/11/055 | null | hep-ph | null | Time variability of the solar neutrino flux especially in the low and
intermediate energy sector remains an open question and, if it exists, it is
likely to be originated from the magnetic moment transition from active to
light sterile neutrinos at times of intense solar activity and magnetic field.
We examine the prospects for the SNO+ experiment to address this important
issue and to distinguish between the two classes of solar models which are
currently identified as corresponding to a high (SSM I) and a low (SSM II)
heavy element abundance. We also evaluate the predictions from these two models
for the Chlorine experiment event rate in the standard LMA and LMA+Spin Flavour
Precession (SFP) scenarios. It is found that after three years of SNO+ data
taking, the pep flux measurement will be able to discriminate between the
standard LMA and LMA+SFP scenarios, independently of which is the correct solar
model. If the LMA rate is measured, SFP with $B_0 \sim 280kG$ for the resonant
$\Delta m^2_{01}$ can be excluded at more than $4\sigma$. A low rate would
signal new physics, excluding all the 90% allowed range of the standard LMA
solution at 3$\sigma$, and a time variability would be a strong signature of
the SFP model. The CNO fluxes are the ones for which the two SSM predictions
exhibit the largest differences, so their measurement at SNO+ will be important
to favour one or the other. The distinction will be clearer after LMA or SFP
are confirmed with pep, but still, a CNO measurement at the level of SSM I/LMA
will disfavour SSM II at about $3 \sigma$. We conclude that consistency between
future pep and CNO flux measurements at SNO+ and Chlorine would either favour
an LMA+SFP scenario or favour SSM II over SSM I.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:49:28 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 18:14:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Picariello",
"Marco",
""
],
[
"Pulido",
"João",
""
],
[
"Andringa",
"S.",
""
],
[
"Barros",
"N. F.",
""
],
[
"Maneira",
"J.",
""
]
] |
0705.4071 | Michele Iovieno | Daniela Tordella, Michele Iovieno, Peter Roger Bailey | A sufficient condition for Gaussian departure in turbulence | 11 pages, 10 figures, To appear in Physical Review E | Physical Review E, 77 (1), 016309, (2008) | 10.1103/PhysRevE.77.016309 | null | physics.flu-dyn physics.gen-ph | null | The interaction of two isotropic turbulent fields of equal integral scale but
different kinetic energy generates the simplest kind of inhomogeneous turbulent
field. In this paper we present a numerical experiment where two time decaying
isotropic fields of kinetic energies $E_1$ and $E_2$ initially match over a
narrow region. Within this region the kinetic energy varies as a hyperbolic
tangent. The following temporal evolution produces a shearless mixing. The
anisotropy and intermittency of velocity and velocity derivative statistics is
observed. In particular the asymptotic behavior in time and as a function of
the energy ratio $E_1/E_2 \to \infty$ is discussed. This limit corresponds to
the maximum observable turbulent energy gradient for a given $E_1$ and is
obtained through the limit $E_2 \to 0$. A field with $E_1/E_2 \to \infty$
represents a mixing which could be observed near a surface subject to a very
small velocity gradient separating two turbulent fields, one of which is nearly
quiescent. In this condition the turbulent penetration is maximum and reaches a
value equal to 1.2 times the nominal mixing layer width. The experiment shows
that the presence of a turbulent energy gradient is sufficient for the
appearance of intermittency and that during the mixing process the pressure
transport is not negligible with respect to the turbulent velocity transport.
These findings may open the way to the hypothesis that the presence of a
gradient of turbulent energy is the minimal requirement for Gaussian departure
in turbulence.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:06:40 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 10:31:04 GMT"
},
{
"version": "v3",
"created": "Wed, 17 Oct 2007 09:30:21 GMT"
}
] | 2012-11-29T00:00:00 | [
[
"Tordella",
"Daniela",
""
],
[
"Iovieno",
"Michele",
""
],
[
"Bailey",
"Peter Roger",
""
]
] |
0705.4072 | James P. Eisenstein | J.P. Eisenstein, D. Syphers, L.N. Pfeiffer, and K.W. West | Quantum Lifetime of Two-Dimensional Holes | 5 pages, 4 figures. Published version | Solid State Communications 143, 365 (2007) | 10.1016/j.ssc.2007.06.010 | null | cond-mat.mes-hall | null | The quantum lifetime of two-dimensional holes in a GaAs/AlGaAs double quantum
well is determined via tunneling spectroscopy. At low temperatures the lifetime
is limited by impurity scattering but at higher temperatures hole-hole Coulomb
scattering dominates. Our results are consistent with Fermi liquid theory, at
least up to r_s = 11. At the highest temperatures the measured width of the
hole spectral function becomes comparable to the Fermi energy. A new,
tunneling-spectroscopic, method for determining the in-plane effective mass of
the holes is also demonstrated.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:09:42 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jul 2007 20:15:34 GMT"
}
] | 2012-08-28T00:00:00 | [
[
"Eisenstein",
"J. P.",
""
],
[
"Syphers",
"D.",
""
],
[
"Pfeiffer",
"L. N.",
""
],
[
"West",
"K. W.",
""
]
] |
0705.4073 | Vadim Zharnitsky Vadim Zharnitsky | M. Burak Erdogan and Vadim Zharnitsky | Quasi-linear dynamics in nonlinear Schr\" odinger equation with periodic
boundary conditions | 19 pages | null | null | null | math-ph math.MP | null | It is shown that a large subset of initial data with finite energy ($L^2$
norm)evolves nearly linearly in nonlinear Schr\" odinger equation with periodic
boundary conditions. These new solutions are not perturbations of the known
ones such as solitons, semiclassical or weakly linear solutions.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:10:01 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 02:46:02 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"Erdogan",
"M. Burak",
""
],
[
"Zharnitsky",
"Vadim",
""
]
] |
0705.4074 | Nguyen Hoang | N. S. Hoang and A. G. Ramm | Solving ill-conditioned linear algebraic systems by the dynamical
systems method (DSM) | 17 pages, 3 figures | null | null | null | math.NA | null | An iterative scheme for the Dynamical Systems Method (DSM) is given such that
one does not have to solve the Cauchy problem occuring in the application of
the DSM for solving ill-conditioned linear algebraic systems. The novelty of
the algorithm is that the algorithm does not have to find the regularization
parameter $a$ by solving a nonlinear equation. Numerical experiments show that
DSM competes favorably with the Variational Regularization.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:14:39 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 04:39:22 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Feb 2008 03:38:45 GMT"
},
{
"version": "v4",
"created": "Mon, 24 Mar 2008 23:58:51 GMT"
}
] | 2008-03-25T00:00:00 | [
[
"Hoang",
"N. S.",
""
],
[
"Ramm",
"A. G.",
""
]
] |
0705.4075 | Inanc Sahin | I. Sahin | $WZ$ Production at $e\gamma$ Colliders and Anomalous Quartic $WWZ\gamma$
Coupling | published version | J. Phys. G: Nucl. Part. Phys. 35 (2008) 035006 | 10.1088/0954-3899/35/3/035006 | null | hep-ph | null | We investigate the constraints on the anomalous quartic $W^{+}W^{-}Z\gamma$
gauge boson coupling through the process $e^{-}\gamma\to \nu_{e}W^{-}Z$.
Considering incoming beam polarizations and the longitudinal and transverse
polarization states of the final W and Z boson we find 95% confidence level
limits on the anomalous coupling parameter $a_{n}$ with an integrated
luminosity of 500 $fb^{-1}$ and $\sqrt{s}$=0.5, 1 TeV energies. We show that
initial beam and final state polarizations improve the sensitivity to the
anomalous coupling by up to factors of 2 - 3.5 depending on the energy.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:17:09 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 13:52:09 GMT"
}
] | 2009-10-06T00:00:00 | [
[
"Sahin",
"I.",
""
]
] |
0705.4076 | Carlo Di Franco | C. Di Franco, M. Paternostro, G. M. Palma, M. S. Kim | Information-flux approach to multiple-spin dynamics | 7 pages, 4 figures, RevTeX4 | Phys. Rev. A 76, 042316 (2007) | 10.1103/PhysRevA.76.042316 | null | quant-ph cond-mat.other math-ph math.MP | null | We introduce and formalize the concept of information flux in a many-body
register as the influence that the dynamics of a specific element receive from
any other element of the register. By quantifying the information flux in a
protocol, we can design the most appropriate initial state of the system and,
noticeably, the distribution of coupling strengths among the parts of the
register itself. The intuitive nature of this tool and its flexibility, which
allow for easily manageable numerical approaches when analytic expressions are
not straightforward, are greatly useful in interacting many-body systems such
as quantum spin chains. We illustrate the use of this concept in quantum
cloning and quantum state transfer and we also sketch its extension to
non-unitary dynamics.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:22:18 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Oct 2007 10:21:37 GMT"
}
] | 2007-10-23T00:00:00 | [
[
"Di Franco",
"C.",
""
],
[
"Paternostro",
"M.",
""
],
[
"Palma",
"G. M.",
""
],
[
"Kim",
"M. S.",
""
]
] |
0705.4077 | Daniel Gottesman | Dorit Aharonov, Daniel Gottesman, Sandy Irani, Julia Kempe | The power of quantum systems on a line | 21 pages. v2 has numerous corrections and clarifications, and most
importantly a new author, merged from arXiv:0705.4067. v3 is the published
version, with additional clarifications, publisher's version available at
http://www.springerlink.com | Comm. Math. Physics, vol. 287, no. 1, pp. 41-65 (2009) | 10.1007/s00220-008-0710-3 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the computational strength of quantum particles (each of finite
dimensionality) arranged on a line. First, we prove that it is possible to
perform universal adiabatic quantum computation using a one-dimensional quantum
system (with 9 states per particle). This might have practical implications for
experimentalists interested in constructing an adiabatic quantum computer.
Building on the same construction, but with some additional technical effort
and 12 states per particle, we show that the problem of approximating the
ground state energy of a system composed of a line of quantum particles is
QMA-complete; QMA is a quantum analogue of NP. This is in striking contrast to
the fact that the analogous classical problem, namely, one-dimensional
MAX-2-SAT with nearest neighbor constraints, is in P. The proof of the
QMA-completeness result requires an additional idea beyond the usual techniques
in the area: Not all illegal configurations can be ruled out by local checks,
so instead we rule out such illegal configurations because they would, in the
future, evolve into a state which can be seen locally to be illegal. Our
construction implies (assuming the quantum Church-Turing thesis and that
quantum computers cannot efficiently solve QMA-complete problems) that there
are one-dimensional systems which take an exponential time to relax to their
ground states at any temperature, making them candidates for being
one-dimensional spin glasses.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:31:42 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 16:38:03 GMT"
},
{
"version": "v3",
"created": "Thu, 19 Feb 2009 21:06:43 GMT"
}
] | 2009-02-20T00:00:00 | [
[
"Aharonov",
"Dorit",
""
],
[
"Gottesman",
"Daniel",
""
],
[
"Irani",
"Sandy",
""
],
[
"Kempe",
"Julia",
""
]
] |
0705.4078 | Rahim Moosa | Rahim Moosa and Anand PIllay | On canonical bases and internality criteria | 13 pages | null | null | null | math.LO math.CV | null | A criterion is given for a type in a finite rank stable theory to be (almost)
internal to a given nonmodular minimal type. The motivation comes from results
of Campana which give criteria for compact complex analytic spaces to be
algebraic (namely Moishezon), in terms of the existence of "generating"
families of algebraic subvarieties. A model-theoretic anologue/generalisation
of Campana's results is given under the hypothesis that the theory has the
"canonical base property" (CBP), a property that is conjectured to hold in all
stable finite rank theories and which states that the type of the canonical
base over a realisation is almost internal to the minimal types of the theory.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:42:57 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Moosa",
"Rahim",
""
],
[
"PIllay",
"Anand",
""
]
] |
0705.4079 | Alpan Raval | Alpan Raval | Molecular Clock on a Neutral Network | 10 pages | null | 10.1103/PhysRevLett.99.138104 | null | q-bio.PE q-bio.MN | null | The number of fixed mutations accumulated in an evolving population often
displays a variance that is significantly larger than the mean (the
overdispersed molecular clock). By examining a generic evolutionary process on
a neutral network of high-fitness genotypes, we establish a formalism for
computing all cumulants of the full probability distribution of accumulated
mutations in terms of graph properties of the neutral network, and use the
formalism to prove overdispersion of the molecular clock. We further show that
significant overdispersion arises naturally in evolution when the neutral
network is highly sparse, exhibits large global fluctuations in neutrality, and
small local fluctuations in neutrality. The results are also relevant for
elucidating the topological structure of a neutral network from empirical
measurements of the substitution process.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 19:01:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Raval",
"Alpan",
""
]
] |
0705.4080 | Konstantin Medynets | S. Bezuglyi, J. Kwiatkowski, and K. Medynets | Aperiodic substitutional systems and their Bratteli diagrams | 42 pages | null | null | null | math.DS | null | In the paper we study aperiodic substitutional dynamical systems arisen from
non-primitive substitutions.
We prove that the Vershik homeomorphism $\phi$ of a stationary ordered
Bratteli diagram is homeomorphic to an aperiodic substitutional system if and
only if no restriction of $\phi$ to a minimal component is homeomorphic to an
odometer. We also show that every aperiodic substitutional system generated by
a substitution with nesting property is homeomorphic to the Vershik map of a
stationary ordered Bratteli diagram. It is proved that every aperiodic
substitutional system is recognizable. The classes of $m$-primitive
substitutions and associated to them derivative substitutions are studied. We
discuss also the notion of expansiveness for Cantor dynamical systems of finite
rank.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:50:48 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Bezuglyi",
"S.",
""
],
[
"Kwiatkowski",
"J.",
""
],
[
"Medynets",
"K.",
""
]
] |
0705.4081 | Ian Hambleton | Ian Hambleton and Ozgun Unlu | Examples of Free Actions on Products of Spheres | Our preprint "Free actions of extraspecial p-groups on S^n x S^n"
(arXiv:math/0701558) is now divided into two separate papers. This is the
final version of the first part (to appear in the "Quarterly Journal of
Mathematics") | Q. J. Math. 60 (2009), no. 4, 461--474 | null | null | math.AT math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a non-abelian extension $\Gamma$ of $S^1$ by $\cy 3 \times \cy
3$, and prove that $\Gamma$ acts freely and smoothly on $S^{5} \times S^{5}$.
This gives new actions on $S^{5} \times S^{5}$ for an infinite family $\cP$ of
finite 3-groups. We also show that any finite odd order subgroup of the
exceptional Lie group $G_2$ admits a free smooth action on $S^{11}\times
S^{11}$. This gives new actions on $S^{11}\times S^{11}$ for an infinite family
$\cE $ of finite groups. We explain the significance of these families $\cP $,
$\cE $ for the general existence problem, and correct some mistakes in the
literature.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 17:51:54 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Jun 2008 17:07:17 GMT"
}
] | 2013-02-12T00:00:00 | [
[
"Hambleton",
"Ian",
""
],
[
"Unlu",
"Ozgun",
""
]
] |
0705.4082 | Francesco Toppan | Richard S. Garavuso and Francesco Toppan | Chern-Simons AdS_5 supergravity in a Randall-Sundrum background | 15 pages; minor typos corrected | Nucl.Phys.B796:320-330,2008 | 10.1016/j.nuclphysb.2007.12.010 | CBPF-NF-008/07 | hep-th gr-qc hep-ph | null | Chern-Simons AdS supergravity theories are gauge theories for the super-AdS
group. These theories possess a fermionic symmetry which differs from standard
supersymmetry. In this paper, we study five-dimensional Chern-Simons AdS
supergravity in a Randall-Sundrum scenario with two Minkowski 3-branes. After
making modifications to the D = 5 Chern-Simons AdS supergravity action and
fermionic symmetry transformations, we obtain a Z_2-invariant total action S =
\tilde{S}_bulk + S_brane and fermionic transformations \tilde{\delta}_\epsilon.
While \tilde{\delta}_\epsilon \tilde{S}_bulk = 0, the fermionic symmetry is
broken by S_brane. Our total action reduces to the original Randall-Sundrum
model when \tilde{S}_bulk is restricted to its gravitational sector. We solve
the Killing spinor equations for a bosonic configuration with vanishing su(N)
and u(1) gauge fields.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:00:28 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 21:15:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Garavuso",
"Richard S.",
""
],
[
"Toppan",
"Francesco",
""
]
] |
0705.4083 | Yuli Nazarov | Yuli V. Nazarov | Full Counting Statistics and Field Theory | microreview, 15 pages, accepted to Ann. Phys. (Leipzig) | Ann. Phys. 16, 720 (2007) | 10.1002/andp.200710259 | null | cond-mat.mes-hall | null | We review the relations between the full counting statistics and the field
theory of electric circuits. We demonstrate that for large conductances the
counting statistics is determined by non-trivial saddle-point of the field.
Coulomb effects in this limit are presented as quantum corrections that can
stongly renormalize the action at low energies.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:30:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nazarov",
"Yuli V.",
""
]
] |
0705.4084 | Petter Holme | Petter Holme, Mikael Huss | Comment on "Regularizing capacity of metabolic networks" | null | Phys. Rev. E 77, 023901 (2008) | 10.1103/PhysRevE.77.023901 | null | q-bio.MN | null | In a recent paper, Marr, Muller-Linow and Hutt [Phys. Rev. E 75, 041917
(2007)] investigate an artificial dynamic system on metabolic networks. They
find a less complex time evolution of this dynamic system in real networks,
compared to networks of reference models. The authors argue that this suggests
that metabolic network structure is a major factor behind the stability of
biochemical steady states. We reanalyze the same kind of data using a dynamic
system modeling actual reaction kinetics. The conclusions about stability, from
our analysis, are inconsistent with those of Marr et al. We argue that this
issue calls for a more detailed type of modeling.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:50:56 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 13:49:46 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Holme",
"Petter",
""
],
[
"Huss",
"Mikael",
""
]
] |
0705.4085 | David Wood | Erik D. Demaine, Francisco Gomez-Martin, Henk Meijer, David Rappaport,
Perouz Taslakian, Godfried T. Toussaint, Terry Winograd, David R. Wood | The Distance Geometry of Music | This is the full version of the paper: "The distance geometry of deep
rhythms and scales." 17th Canadian Conference on Computational Geometry (CCCG
'05), University of Windsor, Canada, 2005 | null | null | null | cs.CG | null | We demonstrate relationships between the classic Euclidean algorithm and many
other fields of study, particularly in the context of music and distance
geometry. Specifically, we show how the structure of the Euclidean algorithm
defines a family of rhythms which encompass over forty timelines
(\emph{ostinatos}) from traditional world music. We prove that these
\emph{Euclidean rhythms} have the mathematical property that their onset
patterns are distributed as evenly as possible: they maximize the sum of the
Euclidean distances between all pairs of onsets, viewing onsets as points on a
circle. Indeed, Euclidean rhythms are the unique rhythms that maximize this
notion of \emph{evenness}. We also show that essentially all Euclidean rhythms
are \emph{deep}: each distinct distance between onsets occurs with a unique
multiplicity, and these multiplicies form an interval $1,2,...,k-1$. Finally,
we characterize all deep rhythms, showing that they form a subclass of
generated rhythms, which in turn proves a useful property called shelling. All
of our results for musical rhythms apply equally well to musical scales. In
addition, many of the problems we explore are interesting in their own right as
distance geometry problems on the circle; some of the same problems were
explored by Erd\H{o}s in the plane.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:36:19 GMT"
}
] | 2007-05-29T00:00:00 | [
[
"Demaine",
"Erik D.",
""
],
[
"Gomez-Martin",
"Francisco",
""
],
[
"Meijer",
"Henk",
""
],
[
"Rappaport",
"David",
""
],
[
"Taslakian",
"Perouz",
""
],
[
"Toussaint",
"Godfried T.",
""
],
[
"Winograd",
"Terry",
""
],
[
"Wood",
"David R.",
""
]
] |
0705.4086 | Edward A. Baron | Wesley Ketchum, E. Baron, and David Branch | Detailed Spectral Analysis of the Type Ib Supernova 1999dn. Paper I:
Hydrogen-free Models | 24 pages, 11 figures, 2 tables, submitted to ApJ | null | 10.1086/522108 | null | astro-ph | null | We present spectral fits to five epochs of the typical Type Ib supernova
1999dn using the generalized, non-LTE, stellar atmospheres code PHOENIX. Our
goal is threefold: to determine basic physical properties of the supernova
ejecta, such as velocity, temperature, and density gradients; to reproduce He I
absorption lines by invoking non-thermal excitation; and, to investigate
possible spectral signatures of hydrogen, especially a feature around 6200
Angstrom, which has been attributed to high velocity $H_\alpha$. Our models
assume an atmosphere with uniform composition devoid of any hydrogen. Our model
spectra fit the observed spectra well, successfully reproducing most of the
features, including the prominent He I absorptions. The most plausible
alternative to $H_\alpha$ as the source of the 6200 Angstrom feature is a blend
of Fe II and Si II lines, which can be made stronger to fit the observed
feature better by increasing the metallicity of the ejecta. High-metallicity
models fit well at early epochs, but not as well as solar-metallicity models
after maximum light. While this blend of metal lines is a reasonable
explanation of the source of the 6200 Angstrom feature, it is still important
to investigate hydrogen as the source; therefore, a second paper will present
models that include a thin shell of hydrogen around the main composition
structure.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:48:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ketchum",
"Wesley",
""
],
[
"Baron",
"E.",
""
],
[
"Branch",
"David",
""
]
] |
0705.4087 | Lei Shu | Lei Shu, D. E. MacLaughlin, Y. Aoki, Y. Tunashima, Y. Yonezawa, S.
Sanada, D. Kikuchi, H. Sato, R. H. Heffner, W. Higemoto, K. Ohishi, T. U.
Ito, O. O. Bernal, A. D. Hillier, R. Kadono, A. Koda, K. Ishida, H. Sugawara,
N. A. Frederick, W. M. Yuhasz, T. A. Sayles, T. Yanagisawa, and M. B. Maple | Muon spin relaxation and hyperfine-enhanced 141Pr nuclear spin dynamic
in Pr(Os,Ru)4Sb12 and (Pr,La)Os4Sb12 | 10 pages, 6 figures, to be published in Phys. Rev. B | Phys. Rev. B 76 014527 (2007) | 10.1103/PhysRevB.76.014527 | null | cond-mat.str-el | null | Zero- and longitudinal-field muon spin relaxation (MuSR) experiments have
been carried out in the alloy series Pr(Os1-xRux)4Sb12 and Pr1-yLayOs4Sb12 to
elucidate the anomalous dynamic muon spin relaxation observed in these
materials. The damping rate associated with this relaxation varies with
temperature, applied magnetic field, and dopant concentrations x and y in a
manner consistent with the ``hyperfine enhancement'' of 141Pr nuclear spins
first discussed by Bleaney in 1973. This mechanism arises from Van Vleck-like
admixture of magnetic Pr3+ crystalline-electric-field-split excited states into
the nonmagnetic singlet ground state by the nuclear hyperfine coupling, thereby
increasing the strengths of spin-spin interactions between 141Pr and muon spins
and within the 141Pr spin system. We find qualitative agreement with this
scenario, and conclude that electronic spin fluctuations are not directly
involved in the dynamic muon spin relaxation.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:49:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shu",
"Lei",
""
],
[
"MacLaughlin",
"D. E.",
""
],
[
"Aoki",
"Y.",
""
],
[
"Tunashima",
"Y.",
""
],
[
"Yonezawa",
"Y.",
""
],
[
"Sanada",
"S.",
""
],
[
"Kikuchi",
"D.",
""
],
[
"Sato",
"H.",
""
],
[
"Heffner",
"R. H.",
""
],
[
"Higemoto",
"W.",
""
],
[
"Ohishi",
"K.",
""
],
[
"Ito",
"T. U.",
""
],
[
"Bernal",
"O. O.",
""
],
[
"Hillier",
"A. D.",
""
],
[
"Kadono",
"R.",
""
],
[
"Koda",
"A.",
""
],
[
"Ishida",
"K.",
""
],
[
"Sugawara",
"H.",
""
],
[
"Frederick",
"N. A.",
""
],
[
"Yuhasz",
"W. M.",
""
],
[
"Sayles",
"T. A.",
""
],
[
"Yanagisawa",
"T.",
""
],
[
"Maple",
"M. B.",
""
]
] |
0705.4088 | Rogerio de Sousa | Rogerio de Sousa | Dangling-bond spin relaxation and magnetic 1/f noise from the
amorphous-semiconductor/oxide interface: Theory | Final published version | Phys. Rev. B 76, 245306 (2007) | 10.1103/PhysRevB.76.245306 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | We propose a model for magnetic noise based on spin-flips (not
electron-trapping) of paramagnetic dangling-bonds at the
amorphous-semiconductor/oxide interface. A wide distribution of spin-flip times
is derived from the single-phonon cross-relaxation mechanism for a
dangling-bond interacting with the tunneling two-level systems of the amorphous
interface. The temperature and frequency dependence is sensitive to three
energy scales: The dangling-bond spin Zeeman energy delta, as well as the
minimum (E_min) and maximum (E_max) values for the energy splittings of the
tunneling two-level systems. We compare and fit our model parameters to a
recent experiment probing spin coherence of antimony donors implanted in
nuclear-spin-free silicon [T. Schenkel {\it et al.}, Appl. Phys. Lett. 88,
112101 (2006)], and conclude that a dangling-bond area density of the order of
10^{14}cm^{-2} is consistent with the data. This enables the prediction of
single spin qubit coherence times as a function of the distance from the
interface and the dangling-bond area density in a real device structure. We
apply our theory to calculations of magnetic flux noise affecting SQUID devices
due to their Si/SiO_2 substrate. Our explicit estimates of flux noise in SQUIDs
lead to a noise spectral density of the order of 10^{-12}Phi_{0}^{2} {Hz}^{-1}
at f=1Hz. This value might explain the origin of flux noise in some SQUID
devices. Finally, we consider the suppression of these effects using surface
passivation with hydrogen, and the residual nuclear-spin noise resulting from a
perfect silicon-hydride surface.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:50:05 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Sep 2007 02:02:04 GMT"
},
{
"version": "v3",
"created": "Sat, 19 Jan 2008 06:16:51 GMT"
}
] | 2008-01-19T00:00:00 | [
[
"de Sousa",
"Rogerio",
""
]
] |
0705.4089 | Hari Krovi | Hari Krovi and Igor Devetak | Local purity distillation with bounded classical communication | 9 pages and 2 figure in .eps | Phys. Rev. A 76, 012321 (2007) | 10.1103/PhysRevA.76.012321 | null | quant-ph | null | Local pure states are an important resource for quantum computing. The
problem of distilling local pure states from mixed ones can be cast in an
information theoretic paradigm. The bipartite version of this problem where
local purity must be distilled from an arbitrary quantum state shared between
two parties, Alice and Bob, is closely related to the problem of separating
quantum and classical correlations in the state and in particular, to a measure
of classical correlations called the one-way distillable common randomness. In
Phys. Rev. A 71, 062303 (2005), the optimal rate of local purity distillation
is derived when many copies of a bipartite quantum state are shared between
Alice and Bob, and the parties are allowed unlimited use of a unidirectional
dephasing channel. In the present paper, we extend this result to the setting
in which the use of the channel is bounded. We demonstrate that in the case of
a classical-quantum system, the expression for the local purity distilled is
efficiently computable and provide examples with their tradeoff curves.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 18:56:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Krovi",
"Hari",
""
],
[
"Devetak",
"Igor",
""
]
] |
0705.4090 | Wladimir Lyra | W. Lyra, A. Johansen, H. Klahr, N. Piskunov | Global magnetohydrodynamical models of turbulence in protoplanetary
disks I. A cylindrical potential on a Cartesian grid and transport of solids | Changes after peer review process | null | 10.1051/0004-6361:20077948 | null | astro-ph | null | We present global 3D MHD simulations of disks of gas and solids, aiming at
developing models that can be used to study various scenarios of planet
formation and planet-disk interaction in turbulent accretion disks. A second
goal is to show that Cartesian codes are comparable to cylindrical and
spherical ones in handling the magnetohydrodynamics of the disk simulations, as
the disk-in-a-box models presented here develop and sustain MHD turbulence. We
investigate the dependence of the magnetorotational instability on disk scale
height, finding evidence that the turbulence generated by the magnetorotational
instability grows with thermal pressure. The turbulent stresses depend on the
thermal pressure obeying a power law of 0.24+/-0.03, compatible with the value
of 0.25 found in shearing box calculations. The ratio of stresses decreased
with increasing temperature. We also study the dynamics of boulders in the
hydromagnetic turbulence. The vertical turbulent diffusion of the embedded
boulders is comparable to the turbulent viscosity of the flow. Significant
overdensities arise in the solid component as boulders concentrate in high
pressure regions.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 19:22:53 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 13:36:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lyra",
"W.",
""
],
[
"Johansen",
"A.",
""
],
[
"Klahr",
"H.",
""
],
[
"Piskunov",
"N.",
""
]
] |
0705.4091 | Goldwurm Andrea | Andrea Goldwurm | High Energy Activity of the Super-Massive Black Hole at the Galactic
Center | 10 pages, 6 figures. Published in Comptes Rendus Physique, Volume 8,
Issue 1, January 2007, Pages 35-44, "Observation of black holes and extreme
gravitational events", Academie des Sciences, Elsevier Science. Available
online 2 February 2007 | Comptes Rendus Physique 8:35-44,2007 | 10.1016/j.crhy.2006.11.001 | null | astro-ph | null | The centre of our galaxy hosts the nearest super-massive black hole to the
solar system, identified to the compact radio source Sgr A*. High energy
experiments have tried in the past to detect the X/gamma-ray emission expected
from the accretion of the surrounding material into this super-massive black
hole. Only recently however, thanks to the new generation of telescopes, it has
been possible to reveal high energy radiation associated with Sgr A* or its
close environment. I will review and discuss in particular the results on the
Sgr A* X-ray flares discovered with Chandra and XMM-Newton, on the central soft
gamma-ray source detected with INTEGRAL and on the galactic centre TeV emission
revealed by HESS.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 19:28:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Goldwurm",
"Andrea",
""
]
] |
0705.4092 | Thomas H. Puzia | Thomas H. Puzia (HIA, STScI), Bahram Mobasher (STScI), and Paul
Goudfrooij (STScI) | Evidence for the Evolution of Young Early-Type Galaxies in the
GOODS/CDF-S Field | 11 pages, 10 figures, accepted for publication in AJ | Astron.J.134:1337-1347,2007 | 10.1086/520500 | null | astro-ph | null | We have developed an efficient photometric technique for identifying young
early-type galaxy candidates using a combination of photometric redshifts,
spectral-type classification, and optical/near-infrared colors. Applying our
technique to the GOODS HST/ACS and VLT/ISAAC data we have selected a complete
and homogeneous sample of young elliptical candidates among early-type field
galaxies. The distribution of structural parameters for these candidates shows
that their selection, which is based on early spectral types, is fully
consistent with early morphological types. We investigate the evolution of
their luminosities and colors as a function of redshift and galaxy mass and
find evidence for an increasing starburst mass fraction in these young
early-type galaxy candidates at higher redshifts, which we interpret in terms
of massive field galaxies experiencing more massive/intense starbursts at
higher redshifts. Moreover, we find indications for a systematically larger
young elliptical fraction among sub-L*/2 early-type galaxies compared to their
brighter counterparts. The total fraction among the field early-type galaxies
increases with redshift, irrespective of galaxy luminosity. Our results are
most consistent with galaxy formation scenarios in which stars in massive
early-type field galaxies are assembled earlier than in their low-mass
counterparts.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 21:13:10 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Puzia",
"Thomas H.",
"",
"HIA, STScI"
],
[
"Mobasher",
"Bahram",
"",
"STScI"
],
[
"Goudfrooij",
"Paul",
"",
"STScI"
]
] |
0705.4093 | Claude Carignan | C. Carignan, O. Hernandez, J. E. Beckman and K. Fathi | GHaFaS: Galaxy Halpha Fabry-Perot Spectrometer for the WHT | 2 pages, proceedings of the conference "Pathways Through an Eclectic
Universe", held in Santiago del Teide, Tenerife, Spain, April 23-27, 2007 | null | null | null | astro-ph | null | A new scanning Fabry-Perot system will soon be available at the Nasmyth focus
of the 4,2m William Hershell Telescope (WHT). It has been designed by the
Laboratoire d'Astrophysique Experimentale (LAE) in Montreal and is being built
in collaboration with astronomers at the Instituto de Astrofisica de Canarias
(IAC). The instrument will see first light at the beginning of July 2007.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 21:07:49 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Carignan",
"C.",
""
],
[
"Hernandez",
"O.",
""
],
[
"Beckman",
"J. E.",
""
],
[
"Fathi",
"K.",
""
]
] |
0705.4094 | Ian Kash | Eric j. Friedman, Joseph Y. Halpern, Ian Kash | Efficiency and Nash Equilibria in a Scrip System for P2P Networks | null | null | null | null | cs.GT | null | A model of providing service in a P2P network is analyzed. It is shown that
by adding a scrip system, a mechanism that admits a reasonable Nash equilibrium
that reduces free riding can be obtained. The effect of varying the total
amount of money (scrip) in the system on efficiency (i.e., social welfare) is
analyzed, and it is shown that by maintaining the appropriate ratio between the
total amount of money and the number of agents, efficiency is maximized. The
work has implications for many online systems, not only P2P networks but also a
wide variety of online forums for which scrip systems are popular, but formal
analyses have been lacking.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:53:09 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Friedman",
"Eric j.",
""
],
[
"Halpern",
"Joseph Y.",
""
],
[
"Kash",
"Ian",
""
]
] |
0705.4095 | Fernando Camilo | F. Camilo (1), S. M. Ransom (2), J. Penalver (3), A. Karastergiou (3),
M. H. van Kerkwijk (4), M. Durant (5), J. P. Halpern (1), J. Reynolds (6), C.
Thum (3), D. J. Helfand (1), N. Zimmerman (1), and I. Cognard (7) ((1)
Columbia, (2) NRAO, (3) IRAM, (4) Toronto, (5) IAC, (6) ATNF, (7) CNRS) | The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197 | Accepted for publication in ApJ; contains improved discussion of
infrared uncertainties | null | 10.1086/521548 | null | astro-ph | null | We have observed the 5.54s anomalous X-ray pulsar XTE J1810-197 at radio,
millimeter, and infrared (IR) wavelengths, with the aim of learning about its
broad-band spectrum. At the IRAM 30m telescope, we have detected the magnetar
at 88 and 144GHz, the highest radio-frequency emission ever seen from a pulsar.
At 88GHz we detected numerous individual pulses, with typical widths ~2ms and
peak flux densities up to 45Jy. Together with nearly contemporaneous
observations with the Parkes, Nancay, and Green Bank telescopes, we find that
in late 2006 July the spectral index of the pulsar was -0.5<alpha<0 over the
range 1.4-144GHz. Nine dual-frequency Very Large Array and Australia Telescope
Compact Array observations in 2006 May-September are consistent with this
finding, while showing variability of alpha with time. We infer from the IRAM
observations that XTE J1810-197 remains highly linearly polarized at millimeter
wavelengths. Also, toward this pulsar, the transition frequency between strong
and weak scattering in the interstellar medium may be near 50GHz. At Gemini, we
detected the pulsar at 2.2um in 2006 September, at the faintest level yet
observed, K_s=21.89+-0.15. We have also analyzed four archival IR Very Large
Telescope observations (two unpublished), finding that the brightness
fluctuated within a factor of 2-3 over a span of 3 years, unlike the monotonic
decay of the X-ray flux. Thus, there is no correlation between IR and X-ray
flux, and it remains uncertain whether there is any correlation between IR and
radio flux.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:00:06 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 16:43:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Camilo",
"F.",
""
],
[
"Ransom",
"S. M.",
""
],
[
"Penalver",
"J.",
""
],
[
"Karastergiou",
"A.",
""
],
[
"van Kerkwijk",
"M. H.",
""
],
[
"Durant",
"M.",
""
],
[
"Halpern",
"J. P.",
""
],
[
"Reynolds",
"J.",
""
],
[
"Thum",
"C.",
""
],
[
"Helfand",
"D. J.",
""
],
[
"Zimmerman",
"N.",
""
],
[
"Cognard",
"I.",
""
]
] |
0705.4096 | Christian Byrnes T | Christian T. Byrnes (1), Kazuya Koyama (1), Misao Sasaki (2) and David
Wands (1) ((1) Portsmouth U., ICG (2) Kyoto U., Yukawa Inst.) | Diagrammatic approach to non-Gaussianity from inflation | 17 pages, 13 figures. v2: Comments and references added, v3:
Introduction expanded, subsection on evaluating loop diagrams added, minor
errors corrected, references added | JCAP 0711:027,2007 | 10.1088/1475-7516/2007/11/027 | null | hep-th astro-ph gr-qc | null | We present Feynman type diagrams for calculating the n-point function of the
primordial curvature perturbation in terms of scalar field perturbations during
inflation. The diagrams can be used to evaluate the corresponding terms in the
n-point function at tree level or any required loop level. Rules are presented
for drawing the diagrams and writing down the corresponding terms in real space
and Fourier space. We show that vertices can be renormalised to automatically
account for diagrams with dressed vertices. We apply these rules to calculate
the primordial power spectrum up to two loops, the bispectrum including loop
corrections, and the trispectrum.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:05:55 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Aug 2007 16:46:27 GMT"
},
{
"version": "v3",
"created": "Sun, 9 Dec 2007 17:41:50 GMT"
}
] | 2009-10-09T00:00:00 | [
[
"Byrnes",
"Christian T.",
"",
"Portsmouth U., ICG"
],
[
"Koyama",
"Kazuya",
"",
"Portsmouth U., ICG"
],
[
"Sasaki",
"Misao",
"",
"Kyoto U., Yukawa Inst"
],
[
"Wands",
"David",
"",
"Portsmouth U., ICG"
]
] |
0705.4097 | Gary Shiu | Gary Shiu, Bret Underwood, Devin G.E. Walker, Kathryn M. Zurek | Probing the Geometry of Warped String Compactifications at the LHC | 4 pages, 4 figures; v2. typos corrected, references added, improved
resolution of Figure 2 | Phys.Rev.Lett.100:031601,2008 | 10.1103/PhysRevLett.100.031601 | MAD-TH-07-08, MADPH-07-1491, UCB-PTH-07/08 | hep-ph astro-ph hep-ex hep-th | null | Warped string compactifications, characterized by non-singular behavior of
the metric in the infrared (IR), feature departures from the usual anti-de
Sitter warped extra dimensions. We study the implications of the smooth IR
cutoff for Randall-Sundrum (RS) type models. We find that the phenomenology of
the KK gravitons (including their masses and couplings) depends sensitively on
the precise shape of the warp factor in the IR. In particular, we analyze the
warped deformed conifold and find that the spectrum differs significantly from
that of RS, and present a simple prescription (a mass gap ansatz) which can be
used to study the phenomenology of IR modifications to 5-d warped extra
dimensions.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 21:03:39 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Jan 2008 19:21:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Shiu",
"Gary",
""
],
[
"Underwood",
"Bret",
""
],
[
"Walker",
"Devin G. E.",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] |
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