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list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.3498 | Geoff Willmott | G.R. Willmott and J.L. Tallon | Measurement of Newtonian fluid slip using a torsional ultrasonic
oscillator | Revised with minor edits for review | null | 10.1103/PhysRevE.76.066306 | null | physics.flu-dyn | null | The composite torsional ultrasonic oscillator, a versatile experimental
system, can be used to investigate slip of Newtonian fluid at a smooth surface.
A rigorous analysis of slip-dependent damping for the oscillator is presented.
Initially, the phenomenon of finite surface slip and the slip length are
considered for a half-space of Newtonian fluid in contact with a smooth,
oscillating solid surface. Definitions are revisited and clarified in light of
inconsistencies in the literature. We point out that, in general oscillating
flows, Navier's slip length b is a complex number. An intuitive velocity
discontinuity parameter of unrestricted phase is used to describe the effect of
slip on measurement of viscous shear damping. The analysis is applied to the
composite oscillator and preliminary experimental work for a 40 kHz oscillator
is presented. The Non-Slip Boundary Condition (NSBC) has been verified for a
hydrophobic surface in water to within ~60 nm of |b|=0 nm. Experiments were
carried out at shear rate amplitudes between 230 and 6800 /s, corresponding to
linear displacement amplitudes between 3.2 and 96 nm.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 02:35:41 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 05:55:55 GMT"
},
{
"version": "v3",
"created": "Thu, 18 Oct 2007 02:48:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Willmott",
"G. R.",
""
],
[
"Tallon",
"J. L.",
""
]
] |
0705.3499 | Guang-Ming Zhang | Dung-Hai Lee, Guang-Ming Zhang, and Tao Xiang | Edge solitons of topological insulators and fractionalized
quasiparticles in two dimensions | 4 pages, 4 figures. The figures have been revised. accepted for
publication by Physical Review Letters | Physical Review Letters, 99, 196805 (2007) | 10.1103/PhysRevLett.99.196805 | null | cond-mat.str-el cond-mat.mes-hall | null | An important characteristic of topological band insulators is the necessary
presence of in-gap edge states on the sample boundary. We utilize this fact to
show that when the boundary is reconnected with a twist, there are always
zero-energy defect states. This provides a natural connection between novel
defects in the two-dimensional $p_{x}+ip_{y}$ superconductor, the Kitaev model,
the fractional quantum Hall effect, and the one-dimensional domain wall of
polyacetylene.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 03:01:36 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Oct 2007 02:58:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lee",
"Dung-Hai",
""
],
[
"Zhang",
"Guang-Ming",
""
],
[
"Xiang",
"Tao",
""
]
] |
0705.3500 | Tsutomu Kobayashi | Tsutomu Kobayashi, Masato Minamitsuji | Brane cosmological solutions in six-dimensional warped flux
compactifications | 12 pages, 2 figures; v2: references added; v3: version published in
JCAP | JCAP 0707:016,2007 | 10.1088/1475-7516/2007/07/016 | WU-AP/266/07, LMU-ASC 33/07 | hep-th astro-ph gr-qc | null | We study cosmology on a conical brane in the six-dimensional
Einstein-Maxwell-dilaton system, where the extra dimensions are compactified by
a magnetic flux. We systematically construct exact cosmological solutions using
the fact that the system is equivalently described by (6+n)-dimensional pure
Einstein-Maxwell theory via dimensional reduction. In particular, we find a
power-law inflationary solution for a general dilatonic coupling. When the
dilatonic coupling is given by that of Nishino-Sezgin chiral supergravity, this
reduces to the known solution which is not inflating. The power-law solution is
shown to be the late-time attractor. We also investigate cosmological tensor
perturbations in this model using the (6+n)-dimensional description. We obtain
the separable equation of motion and find that there always exist a zero mode,
while tachyonic modes are absent in the spectrum. The mass spectrum of
Kaluza-Klein modes is obtained numerically.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 03:05:34 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 10:37:52 GMT"
},
{
"version": "v3",
"created": "Fri, 13 Jul 2007 13:07:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kobayashi",
"Tsutomu",
""
],
[
"Minamitsuji",
"Masato",
""
]
] |
0705.3501 | Chris Stucchio | A. Soffer and C. Stucchio | Multiscale Resolution of Shortwave-Longwave Interaction | 42 pages, 7 figures | null | null | null | math.NA math.AP | null | In the study of time-dependent waves, it is computationally expensive to
solve a problem in which high frequencies (shortwaves, with wavenumber k =
kmax) and low frequencies (longwaves, near k=kmin) mix. Consider a problem in
which low frequencies scatter off a sharp impurity. The impurity generates high
frequencies which propagate and spread throughout the computational domain,
while the domain must be large enough to contain several longwaves.
Conventional spectral methods have computational cost proportional to
O(kmax/kmin \log (kmax/kmin)).
We present here a multiscale algorithm (implemented for the Schrodinger
equation, but generally applicable) which solves the problem with cost (in
space and time) O(kmax L log(kmax / kmin) \log(kmax L)). Here, L is the width
of the region in which the algorithm resolves all frequencies, and is
independent of kmin.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 03:33:31 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 14:40:51 GMT"
}
] | 2008-03-11T00:00:00 | [
[
"Soffer",
"A.",
""
],
[
"Stucchio",
"C.",
""
]
] |
0705.3502 | Seng Ghee Tan | S. G. Tan, M. B. A. Jalil, Xiong-Jun Liu | Local spin dynamic arising from the non-perturbative SU(2) gauge field
of the spin orbit effect | 11 pages 2 figures | null | null | null | cond-mat.mes-hall | null | We use the non-perturbative gauge field approach to study the effects of spin
orbit coupling on the dynamic of magnetic moment. We present a general equation
of motion (EOM) which unifies i) the spin orbit coupling effect derived from
the SU(2) spin gauge field, and ii) the moment chirality effect previously
derived from the topological U(1)xU(1) rotation gauge under the adiabatic
condition. We present a modified Landau-Liftshitz-Gilbert equation and discuss
the implication of the modified EOM in various technological applications, such
as current-induced switching and trajectory of magnetic moments in spin-valve
multilayers, magnetic memory and diluted magnetic semiconductor.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 03:37:27 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Tan",
"S. G.",
""
],
[
"Jalil",
"M. B. A.",
""
],
[
"Liu",
"Xiong-Jun",
""
]
] |
0705.3503 | Catuscia Palamidessi | Konstantinos Chatzikokolakis and Catuscia Palamidessi | Making Random Choices Invisible to the Scheduler | null | null | null | null | cs.CR cs.LO | null | When dealing with process calculi and automata which express both
nondeterministic and probabilistic behavior, it is customary to introduce the
notion of scheduler to solve the nondeterminism. It has been observed that for
certain applications, notably those in security, the scheduler needs to be
restricted so not to reveal the outcome of the protocol's random choices, or
otherwise the model of adversary would be too strong even for ``obviously
correct'' protocols. We propose a process-algebraic framework in which the
control on the scheduler can be specified in syntactic terms, and we show how
to apply it to solve the problem mentioned above. We also consider the
definition of (probabilistic) may and must preorders, and we show that they are
precongruences with respect to the restricted schedulers. Furthermore, we show
that all the operators of the language, except replication, distribute over
probabilistic summation, which is a useful property for verification.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 04:28:47 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Chatzikokolakis",
"Konstantinos",
""
],
[
"Palamidessi",
"Catuscia",
""
]
] |
0705.3504 | Jaita Paul | Jaita Paul, Takeshi Nishimatsu, Y. Kawazoe and Umesh V. Waghmare | Ferroelectric Phase Transitions in Ultra-thin Films of BaTiO3 | null | null | 10.1103/PhysRevLett.99.077601 | null | cond-mat.mtrl-sci | null | We present molecular dynamics simulations of a realistic model of an
ultrathin film of BaTiO$_3$ sandwiched between short-circuited electrodes to
determine and understand effects of film thickness, epitaxial strain and the
nature of electrodes on its ferroelectric phase transitions as a function of
temperature. We determine a full epitaxial strain-temperature phase diagram in
the presence of perfect electrodes. Even with the vanishing depolarization
field, we find that ferroelectric phase transitions to states with in-plane and
out-of-plane components of polarization exhibit dependence on thickness; it
arises from the interactions of local dipoles with their electrostatic images
in the presence of electrodes. Secondly, in the presence of relatively bad
metal electrodes which only partly compensate the surface charges and
depolarization field, a qualitatively different phase with stripe-like domains
is stabilized at low temperature.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 04:01:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Paul",
"Jaita",
""
],
[
"Nishimatsu",
"Takeshi",
""
],
[
"Kawazoe",
"Y.",
""
],
[
"Waghmare",
"Umesh V.",
""
]
] |
0705.3505 | Jan-e Alam Dr. | Jajati K. Nayak, Jan-e Alam, Sourav Sarkar and Bikash Sinha | Thermal photons to dileptons ratio at LHC | 2 pages with 2 eps figures | null | null | null | nucl-th | null | It is shown that the ratio of transverse momentum (p_T) distribution of
thermal photons to dileptons produced in heavy ion collisions reaches a plateau
above p_T=1 GeV. We argue that the value of the ratio in the plateau region can
be used to estimate the initial temperature.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 04:24:35 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Nayak",
"Jajati K.",
""
],
[
"Alam",
"Jan-e",
""
],
[
"Sarkar",
"Sourav",
""
],
[
"Sinha",
"Bikash",
""
]
] |
0705.3506 | Andy Chia | A. Chia and A. S. Parkins | Entangled-State Cycles of Atomic Collective-Spin States | 10 pages, 9 figures | Phys. Rev. A 77, 033810 (2008) | 10.1103/PhysRevA.77.033810 | null | quant-ph | null | We study quantum trajectories of collective atomic spin states of $N$
effective two-level atoms driven with laser and cavity fields. We show that
interesting ``entangled-state cycles'' arise probabilistically when the (Raman)
transition rates between the two atomic levels are set equal. For odd (even)
$N$, there are $(N+1)/2$ ($N/2$) possible cycles. During each cycle the
$N$-qubit state switches, with each cavity photon emission, between the states
$(|N/2,m>\pm |N/2,-m>)/\sqrt{2}$, where $|N/2,m>$ is a Dicke state in a rotated
collective basis. The quantum number $m$ ($>0$), which distinguishes the
particular cycle, is determined by the photon counting record and varies
randomly from one trajectory to the next. For even $N$ it is also possible,
under the same conditions, to prepare probabilistically (but in steady state)
the Dicke state $|N/2,0>$, i.e., an $N$-qubit state with $N/2$ excitations,
which is of particular interest in the context of multipartite entanglement.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 04:48:45 GMT"
}
] | 2011-10-28T00:00:00 | [
[
"Chia",
"A.",
""
],
[
"Parkins",
"A. S.",
""
]
] |
0705.3507 | Axel Brandenburg | A Brandenburg (Nordita) and P J K\"apyl\"a (Nordita and Helsinki
Observatory) | Magnetic helicity effects in astrophysical and laboratory dynamos | 25 pages, 16 figures, accepted by New Journal of Physics, special
edition | New J.Phys.9:305,2007 | 10.1088/1367-2630/9/8/305 | NORDITA-2007-16 | astro-ph | null | Magnetic helicity effects are discussed in laboratory and astrophysical
settings. First, dynamo action in Taylor-Green flows is discussed for different
boundary conditions. However, because of the lack of scale separation with
respect to the container, no large scale field is being produced and there is
no resistively slow saturation phase as otherwise expected. Second, the
build-up of a large scale field is demonstrated in a simulation where a
localized magnetic eddy produces field on a larger scale if the eddy possesses
a swirl. Such a set-up might be realizable experimentally through coils.
Finally, new emerging issues regarding the connection between magnetic helicity
and the solar dynamo are discussed. It is demonstrated that dynamos with a
non-local (Babcock-Leighton type) alpha effect can also be catastrophically
quenched, unless there are magnetic helicity fluxes.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 05:42:44 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Brandenburg",
"A",
"",
"Nordita"
],
[
"Käpylä",
"P J",
"",
"Nordita and Helsinki\n Observatory"
]
] |
0705.3508 | Axel Brandenburg | A. Brandenburg (Nordita) and K. Subramanian (IUCAA) | Simulations of the anisotropic kinetic and magnetic alpha effects | 6 pages, 6 figures, accepted by Astron. Nachr | Astron.Nachr.328:507-512,2007 | 10.1002/asna.200710772 | NORDITA-2007-17 | astro-ph | null | The validity of a closure called the minimal tau approximation (MTA), is
tested in the context of dynamo theory, wherein triple correlations are assumed
to provide relaxation of the turbulent electromotive force. Under MTA, the
alpha effect in mean field dynamo theory becomes proportional to a relaxation
time scale multiplied by the difference between kinetic and current helicities.
It is shown that the value of the relaxation time is positive and, in units of
the turnover time at the forcing wavenumber, it is of the order of unity. It is
quenched by the magnetic field -- roughly independently of the magnetic
Reynolds number. However, this independence becomes uncertain at large magnetic
Reynolds number. Kinetic and current helicities are shown to be dominated by
large scale properties of the flow.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 05:47:02 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Brandenburg",
"A.",
"",
"Nordita"
],
[
"Subramanian",
"K.",
"",
"IUCAA"
]
] |
0705.3509 | Alister W. Graham | Alister W. Graham | Comment on: A SuperMassive Black Hole Fundamental Plane for Ellipticals | 2 page research note | null | null | null | astro-ph | null | A simple regression analysis designed for predicting the supermassive black
hole mass from the effective radius and mean effective surface brightness of
the host bulge has been performed using the data from Barway & Kembhavi
(arXiv:0705.1508). The scatter in the log M_bh direction is 0.32 dex, greater
than reported and comparable with values obtained using a single predictor
quantity such as luminosity, velocity dispersion or Sersic index.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 05:40:58 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Graham",
"Alister W.",
""
]
] |
0705.3510 | Fritz Gesztesy | Fritz Gesztesy, Marius Mitrea, and Maxim Zinchenko | Variations on a Theme of Jost and Pais | 40 pages. To appear in J. Funct. Anal | null | null | null | math.SP math-ph math.MP | null | We explore the extent to which a variant of a celebrated formula due to Jost
and Pais, which reduces the Fredholm perturbation determinant associated with
the Schr\"odinger operator on a half-line to a simple Wronski determinant of
appropriate distributional solutions of the underlying Schr\"odinger equation,
generalizes to higher dimensions. In this multi-dimensional extension the
half-line is replaced by an open set $\Omega\subset\bbR^n$, $n\in\bbN$, $n\geq
2$, where $\Omega$ has a compact, nonempty boundary $\partial\Omega$ satisfying
certain regularity conditions. Our variant involves ratios of perturbation
determinants corresponding to Dirichlet and Neumann boundary conditions on
$\partial\Omega$ and invokes the corresponding Dirichlet-to-Neumann map. As a
result, we succeed in reducing a certain ratio of modified Fredholm
perturbation determinants associated with operators in $L^2(\Omega; d^n x)$,
$n\in\bbN$, to modified Fredholm determinants associated with operators in
$L^2(\partial\Omega; d^{n-1}\sigma)$, $n\geq 2$.
Applications involving the Birman-Schwinger principle and eigenvalue counting
functions are discussed.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 05:35:09 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Gesztesy",
"Fritz",
""
],
[
"Mitrea",
"Marius",
""
],
[
"Zinchenko",
"Maxim",
""
]
] |
0705.3511 | Joseph C. V\'arilly | Victor Gayral, Jose M. Gracia-Bondia and Joseph C. Varilly | Fourier analysis on the affine group, quantization and noncompact Connes
geometries | 37 pages, Latex, uses TikZ package to draw 3 figures. Two new
subsections, main results unchanged | J.Noncommut.Geom.2:215-261, 2008 | 10.4171/JNCG/20 | null | hep-th math.RT | null | We find the Stratonovich-Weyl quantizer for the nonunimodular affine group of
the line. A noncommutative product of functions on the half-plane, underlying a
noncompact spectral triple in the sense of Connes, is obtained from it. The
corresponding Wigner functions reproduce the time-frequency distributions of
signal processing. The same construction leads to scalar Fourier
transformations on the affine group, simplifying and extending the Fourier
transformation proposed by Kirillov.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 06:08:13 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Jun 2007 01:33:54 GMT"
},
{
"version": "v3",
"created": "Mon, 4 Feb 2008 17:38:40 GMT"
}
] | 2010-11-19T00:00:00 | [
[
"Gayral",
"Victor",
""
],
[
"Gracia-Bondia",
"Jose M.",
""
],
[
"Varilly",
"Joseph C.",
""
]
] |
0705.3512 | Boris A. Popov | Boris A. Popov (for the HARP Collaboration) | Results from HARP and their implications for neutrino physics | Presented at the XLIInd Rencontres de Moriond on Electroweak
Interactions and Unified Theories | null | null | null | hep-ex | null | Recent results from the HARP experiment on the measurements of the
double-differential production cross-section of pions in proton interactions
with beryllium, carbon and tantalum targets are presented. These results are
relevant for a detailed understanding of neutrino flux in accelerator neutrino
experiments MiniBooNE/SciBooNE, for a better prediction of atmospheric neutrino
fluxes as well as for an optimization of a future neutrino factory design.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 06:12:55 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Popov",
"Boris A.",
"",
"for the HARP Collaboration"
]
] |
0705.3513 | Benjamin Kilminster | Ben Kilminster (on behalf of the CDF and D0 collaborations) | Standard Model Higgs Boson Searches at the Tevatron | 4 pages, 4 figures | null | null | null | hep-ex | null | The CDF and D{\O} experiments at the Tevatron are currently the only capable
of searching for the Standard Model Higgs boson. This article describes their
most sensitive searches in the expected Higgs mass range, focusing on advanced
methods used to extract the maximal sensitivity from the data. CDF presents
newly updated results for $H \to W^+W^-$ and $ZH \to l^+l^- b\bar{b}$. D{\O}\
presents two new searches for $WH \to l\nu b\bar{b}$. These new analyses use
the same 1 fb$^{-1}$ dataset as previous searches, but with improved techniques
resulting in markedly improved sensitivity.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 06:43:42 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Kilminster",
"Ben",
"",
"on behalf of the CDF and D0 collaborations"
]
] |
0705.3514 | Qingjuan Yu | Qingjuan Yu, Piero Madau | Kinematics of hypervelocity stars in the triaxial halo of the Milky Way | 10 pages,including 9 figures | Mon.Not.Roy.Astron.Soc.379:1293-1301,2007 | 10.1111/j.1365-2966.2007.12034.x | null | astro-ph | null | Hypervelocity stars (HVSs) ejected by the massive black hole at the Galactic
center have unique kinematic properties compared to other halo stars. Their
trajectories will deviate from being exactly radial because of the asymmetry of
the Milky Way potential produced by the flattened disk and the triaxial dark
matter halo, causing a change of angular momentum that can be much larger than
the initial small value at injection. We study the kinematics of HVSs and
propose an estimator of dark halo triaxiality that is determined only by
instantaneous position and velocity vectors of HVSs at large Galactocentric
distances (r>~50kpc). We show that, in the case of a substantially triaxial
halo, the distribution of deflection angles (the angle between the stellar
position and velocity vector) for HVSs on bound orbits is spread uniformly over
the range 10--180deg. Future astrometric and deep wide-field surveys should
measure the positions and velocities of a significant number of HVSs, and
provide useful constraints on the shape of the Galactic dark matter halo.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 19:34:02 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Yu",
"Qingjuan",
""
],
[
"Madau",
"Piero",
""
]
] |
0705.3515 | Balan Adriana | Adriana Balan | A Morita context and Galois extensions for Quasi-Hopf algebras | 20 pages, minor changes, accepted to Communications in Algebra | null | null | null | math.QA | null | If H is a finite dimensional quasi-Hopf algebra and A is a left H-module
algebra, we prove that there is a Morita context connecting the smash product
A#H and the subalgebra of invariants A^{H}. We define also Galois extensions
and prove the connection with this Morita context, as in the Hopf case.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 19:12:13 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jul 2007 13:25:51 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Balan",
"Adriana",
""
]
] |
0705.3516 | Alessandro Portaluri | Alessandro Portaluri | On a generalized Sturm theorem | 9 pages. No figures. Fully revised version. To appear in Advanced
Nonlinear Studies | null | null | null | math.CA math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sturm oscillation theorem for second order differential equations was
generalized to systems and higher order equations with positive leading
coefficient by several authors. What we propose here is a Sturm oscillation
theorem for systems of even order having strongly indefinite leading
coefficient.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 07:09:17 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 13:57:29 GMT"
},
{
"version": "v3",
"created": "Sat, 23 May 2009 16:20:11 GMT"
}
] | 2009-05-23T00:00:00 | [
[
"Portaluri",
"Alessandro",
""
]
] |
0705.3517 | Mohammad Reza Setare | M R Setare | Holographic tachyon model of dark energy | 13 pages, no figures | Phys.Lett.B653:116-121,2007 | 10.1016/j.physletb.2007.08.011 | null | hep-th | null | In this paper we consider a correspondence between the holographic dark
energy density and tachyon energy density in FRW universe. Then we reconstruct
the potential and the dynamics of the tachyon field which describe tachyon
cosmology.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 07:27:31 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 15:18:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Setare",
"M R",
""
]
] |
0705.3518 | Nicolas Greiner | N.Greiner | Constraints On Unparticle Physics In Electroweak Gauge Boson Scattering | 12 pages, 5 figures, typos corrected, references added | Phys.Lett.B653:75-80,2007 | 10.1016/j.physletb.2007.07.027 | null | hep-ph | null | The existence of scale invariant physics would lead to new phenomena in
particle physics that could be detected at the LHC. In this paper we exploit
the effects of these unparticles in $WW \to WW$ scattering. From the
requirement of unitarity we derive constraints on unparticle physics. We show
that the existence of unparticles would lead to deviations in differential
cross sections which can be measured. These deviations are sensitive on the
scale dimension and on the spin characteristics of the unparticles.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 07:30:51 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 17:07:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Greiner",
"N.",
""
]
] |
0705.3519 | Marcella Contini | M.Contini (Tel Aviv University) and T. Contini (Laboratoire
d'Astrophysique de Toulouse et Tarbe) | Comparison of dust-to-gas ratios in luminous, ultraluminous, and
hyperluminous infrared galaxies | 19 pages+ 7 figures. in press in AN | null | 10.1002/asna.200710782 | null | astro-ph | null | The dust-to-gas ratios in three different samples of luminous, ultraluminous,
and hyperluminous infrared galaxies are calculated by modelling their radio to
soft X-ray spectral energy distributions using composite models which account
for the photoionizing radiation from HII regions, starbursts, or AGNs, and for
shocks. The models are limited to a set which broadly reproduces the mid-IR
fine structure line ratios of local, IR bright, starburst galaxies. The results
show that two types of clouds contribute to the IR emission. Those
characterized by low shock velocities and low preshock densities explain the
far-IR dust emission, while those with higher velocities and densities
contribute to mid-IR dust emission. An AGN is found in nearly all of the
ultraluminous IR galaxies and in half of the luminous IR galaxies of the
sample. High IR luminosities depend on dust-to-gas ratios of about 0.1 by mass,
however, most hyperluminous IR galaxies show dust-to-gas ratios much lower than
those calculated for the luminous and ultraluminous IR galaxies.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:41:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Contini",
"M.",
"",
"Tel Aviv University"
],
[
"Contini",
"T.",
"",
"Laboratoire\n d'Astrophysique de Toulouse et Tarbe"
]
] |
0705.3520 | Marco Grilli | S. Caprara, M. Grilli, B. Leridon, and J. Vanhacken | Evidences for pairing of nearly-free quasiparticles from
paraconductivity in layered superconducting cuprates | 4 pages, 4 figures, text extended, one fig. removed | null | null | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the Aslamazov-Larkin theory of paraconductivity in two dimensions,
to distinguish its universal features from the specific features of nearly-free
paired fermions. We show that both the numerical prefactor and the temperature
dependence of the experimental paraconductivity in underdoped La_{2-x}Sr_xCuO_4
are only compatible with pairing of nearly-free fermionic quasiparticles. This
conclusion is strengthened by the analysis of paraconductivity data in the
presence of a finite magnetic field, from which we extract a rather low value
of the critical field H_{c2}(T=0).
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:01:58 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Sep 2008 12:30:38 GMT"
}
] | 2008-09-25T00:00:00 | [
[
"Caprara",
"S.",
""
],
[
"Grilli",
"M.",
""
],
[
"Leridon",
"B.",
""
],
[
"Vanhacken",
"J.",
""
]
] |
0705.3521 | Nicolas Fressengeas | Nicolas Fressengeas (LMOPS), Naima Khelfaoui (LMOPS), Cristian Dan
(LMOPS), Delphine Wolfersberger (LMOPS), Germano Montemezzani (LMOPS),
Herv\'e Leblond (LPOMA), Mathieu Chauvet (FEMTO-ST) | Roles of resonance and dark irradiance for infrared photorefractive
self-focusing and solitons in bi-polar InP:Fe | null | Physical Review A: Atomic, Molecular and Optical Physics 75
(29/06/2007) 063834 | 10.1103/PhysRevA.75.063834 | null | physics.optics | null | This paper shows experimental evidence of photorefractive steady state
self-focusing in InP:Fe for a wide range of intensities, at both 1.06 and
1.55$\mu$m. To explain those results, it is shown that despite the bi-polar
nature of InP:Fe where one photocarrier and one thermal carrier are to be
considered, the long standing one photocarrier model for photorefractive
solitons can be usefully applied. The relationship between the dark irradiance
stemming out of this model and the known resonance intensity is then discussed.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:07:43 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 06:54:01 GMT"
}
] | 2007-07-12T00:00:00 | [
[
"Fressengeas",
"Nicolas",
"",
"LMOPS"
],
[
"Khelfaoui",
"Naima",
"",
"LMOPS"
],
[
"Dan",
"Cristian",
"",
"LMOPS"
],
[
"Wolfersberger",
"Delphine",
"",
"LMOPS"
],
[
"Montemezzani",
"Germano",
"",
"LMOPS"
],
[
"Leblond",
"Hervé",
"",
"LPOMA"
],
[
"Chauvet",
"Mathieu",
"",
"FEMTO-ST"
]
] |
0705.3522 | Alessandro Ardizzoni | A. Ardizzoni, C. Menini | Small Bialgebras with a Projection: Applications | null | null | 10.1080/00927870802623419 | null | math.QA math.RA | null | In this paper we continue the investigation started in [A.M.St.-Small],
dealing with bialgebras $A$ with an $H$-bilinear coalgebra projection over an
arbitrary subbialgebra $H$ with antipode. These bialgebras can be described as
deformed bosonizations $R#_{\xi} H$ of a pre-bialgebra $R$ by $H$ with a
cocycle $\xi$. Here we describe the behavior of $\xi$ in the case when $R$ is
f.d. and thin i.e. it is connected with one dimensional space of primitive
elements. This is used to analyze the arithmetic properties of $A$. Meaningful
results are obtained when $H$ is cosemisimple. By means of Ore extension
construction, we provide some examples of atypical situations (e.g. the
multiplication of $R$ is not $H$-colinear or $\xi$ is non-trivial).
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:17:16 GMT"
}
] | 2011-02-19T00:00:00 | [
[
"Ardizzoni",
"A.",
""
],
[
"Menini",
"C.",
""
]
] |
0705.3523 | Feliciano de Soto | F. de Soto, C. Roiesnel | On the reduction of hypercubic lattice artifacts | 15 pages. 4 figures. Minor changes (Appendix and refs added) | JHEP0709:007,2007 | 10.1088/1126-6708/2007/09/007 | null | hep-lat | null | This note presents a comparative study of various options to reduce the
errors coming from the discretization of a Quantum Field Theory in a lattice
with hypercubic symmetry. We show that it is possible to perform an
extrapolation towards the continuum which is able to eliminate systematically
the artifacts which break the O(4) symmetry.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:09:09 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 18:36:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"de Soto",
"F.",
""
],
[
"Roiesnel",
"C.",
""
]
] |
0705.3524 | Isamu Iwanari | Isamu Iwanari | Integral Chow rings of toric stacks | v2:title was changed | null | null | null | math.AG | null | The purpose of this paper is to prove that integral Chow rings of toric
stacks are naturally isomorphic to Stanley-Reisner rings.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:10:20 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 17:23:59 GMT"
}
] | 2007-07-17T00:00:00 | [
[
"Iwanari",
"Isamu",
""
]
] |
0705.3525 | Bruno Andreotti | B. Andreotti and P. Claudin | Comment on "Minimal size of a barchan dune" | A six page comment on ``Minimal size of a barchan dune'' by Parteli,
Duran and Herrmann [Phys. Rev. E 75, 011301 (2007) arXiv:0705.1778] | null | 10.1103/PhysRevE.76.063301 | null | cond-mat.soft | null | It is now an accepted fact that the size at which dunes form from a flat sand
bed as well as their `minimal size' scales on the flux saturation length. This
length is by definition the relaxation length of the slowest mode toward
equilibrium transport. The model presented by Parteli, Duran and Herrmann
[Phys. Rev. E 75, 011301 (2007)] predicts that the saturation length decreases
to zero as the inverse of the wind shear stress far from the threshold. We
first show that their model is not self-consistent: even under large wind, the
relaxation rate is limited by grain inertia and thus can not decrease to zero.
A key argument presented by these authors comes from the discussion of the
typical dune wavelength on Mars (650 m) on the basis of which they refute the
scaling of the dune size with the drag length evidenced by Claudin and
Andreotti [Earth Pla. Sci. Lett. 252, 30 (2006)]. They instead propose that
Martian dunes, composed of large grains (500 micrometers), were formed in the
past under very strong winds. We show that this saltating grain size, estimated
from thermal diffusion measurements, is not reliable. Moreover, the microscopic
photographs taken by the rovers on Martian aeolian bedforms show a grain size
of 87 plus or minus 25 micrometers together with hematite spherules at
millimetre scale. As those so-called ``blueberries'' can not be entrained by
reasonable winds, we conclude that the saltating grains on Mars are the small
ones, which gives a second strong argument against the model of Parteli et al.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:17:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Andreotti",
"B.",
""
],
[
"Claudin",
"P.",
""
]
] |
0705.3526 | Hans-Joachim Grafe | H.-J. Grafe, F. Hammerath, A. Vyalikh, G. Urbanik, V. Kataev, Th.
Wolf, G. Khaliullin, and B. B\"uchner | Cu NQR Wipeout Effect versus Charge Pseudogap in Zn/Ni Doped
NdBa$_{2}$Cu$_{3}$O$_{6+y}$ | 4 pages, 2 figures; submitted to Phys. Rev. Lett | null | null | null | cond-mat.supr-con | null | We report $^{63,65}$Cu NQR measurements on slightly underdoped
NdBa$_{2}$Cu$_{3}$O$_{6+y}$ single crystals heavily doped by Ni and Zn
impurities. Owing to the impurity doping superconductivity is fully suppressed
in both cases. The Ni strongly enhances magnetic correlations and induces a
wipeout of the NQR signal comparable to that found in stripe ordered lanthanum
cuprates. In contrast, the magnetism is suppressed in the Zn doped sample where
no wipeout effect is observed and the nuclear spin relaxation rate is reduced.
Our findings are in a striking correspondence with the different impact of Ni
and Zn impurities on the charge pseudogap evidenced by recent optical data,
uncovering thereby a close relationship between the magnetic correlations and
pseudogap phenomena.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:35:39 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Grafe",
"H. -J.",
""
],
[
"Hammerath",
"F.",
""
],
[
"Vyalikh",
"A.",
""
],
[
"Urbanik",
"G.",
""
],
[
"Kataev",
"V.",
""
],
[
"Wolf",
"Th.",
""
],
[
"Khaliullin",
"G.",
""
],
[
"Büchner",
"B.",
""
]
] |
0705.3527 | Hiroto Nakajima | Hiroto Nakajima | Testing the seesaw mechanism at collider energies in the Randall-Sundrum
model | 13 pages, 6 figures | null | null | UT-07-17 | hep-ph | null | The Randall-Sundrum model with gauge fields and fermions in the bulk has
several attractive features including the gauge coupling unification, a
candidate for the dark matter, and an explanation for the hierarchical Yukawa
couplings.
In this paper, we point out that the 1st Kaluza-Klein modes of right-handed
neutrinos may be produced at colliders, for both Dirac and Majorana neutrino
cases. Furthermore, we can see whether the neutrino masses are Dirac type or
Majorana type from the mass spectrum of KK particles.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:38:32 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Nakajima",
"Hiroto",
""
]
] |
0705.3528 | Manvelyan Ruben | Ruben Manvelyan and Werner Ruehl | The Generalized Curvature and Christoffel Symbols for a Higher Spin
Potential in AdS_{d+1} Space | 19 pages, Latex, v2 references added, v3 one section and references
added | Nucl.Phys.B797:371-394,2008 | 10.1016/j.nuclphysb.2007.10.012 | null | hep-th | null | The generalized curvature tensor and Christoffel symbols are determined in
AdS_{d+1} background by a modified ansatz of the de Wit - Freedman type by
imposing gauge invariance. The resulting set of recurrence relations and
difference equations is solved. The Riemann curvature tensor is derived by
antisymmetrization. All results are presented as finite power series in the
inverse AdS radius and are unique. The fourth order, which is complete for
fields up to spin five, is calculated explicitly. Higher orders can be obtained
with the same method.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:44:18 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 06:07:36 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Aug 2007 08:53:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Manvelyan",
"Ruben",
""
],
[
"Ruehl",
"Werner",
""
]
] |
0705.3529 | Piotr Korcyl | Piotr Korcyl | Detailed study of a transition point in the Veneziano-Wosiek model of
Planar Quantum Mechanics | 10 pages, 8 figures, submitted to Acta Physica Polonica | Acta Phys.Polon.B38:3169-3180,2007 | null | null | hep-th | null | Following a model recently investigated by Veneziano and Wosiek we briefly
introduce Planar Quantum Mechanics (PQM). Then, we present high precision
numerical results in the sectors with two and three fermions. We confirm, that
the transition point in the 't Hooft's coupling constant lambda in these
sectors occurs at lambda = 1, as was expected.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 08:58:32 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Korcyl",
"Piotr",
""
]
] |
0705.3530 | Takeshi Fukuyama | Takeshi Fukuyama, Kiyoshi Kamimura, Sasa Kresi\'c-Juri\'c, Stjepan
Meljanac | Gauge transformations and symmetries of integrable systems | 18pages, no figure Journal version | J.Phys.A40:12227-12242,2007 | 10.1088/1751-8113/40/40/014 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze several integrable systems in zero-curvature form within the
framework of $SL(2,\R)$ invariant gauge theory. In the Drienfeld-Sokolov gauge
we derive a two-parameter family of nonlinear evolution equations which as
special cases include the Kortweg-de Vries (KdV) and Harry Dym equations. We
find residual gauge transformations which lead to infinintesimal symmetries of
this family of equations. For KdV and Harry Dym equations we find an infinite
hierarchy of such symmetry transformations, and we investigate their relation
with local conservation laws, constants of the motion and the bi-Hamiltonian
structure of the equations. Applying successive gauge transformatinos of Miura
type we obtain a sequence of gauge equivalent integrable systems, among them
the modified KdV and Calogero KdV equations.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:03:35 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jul 2008 05:14:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Kamimura",
"Kiyoshi",
""
],
[
"Kresić-Jurić",
"Sasa",
""
],
[
"Meljanac",
"Stjepan",
""
]
] |
0705.3531 | Pooja Singla | Takayuki Hibi and Pooja Singla | Linear balls and the multiplicity conjecture | 19 Pages | null | null | null | math.AC | null | A linear ball is a simplicial complex whose geometric realization is
homeomorphic to a ball and whose Stanley--Reisner ring has a linear resolution.
It turns out that the Stanley--Reisner ring of the sphere which is the boundary
complex of a linear ball satisfies the multiplicity conjecture. A class of
shellable spheres arising naturally from commutative algebra whose
Stanley--Reisner rings satisfy the multiplicity conjecture will be presented.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:05:51 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Hibi",
"Takayuki",
""
],
[
"Singla",
"Pooja",
""
]
] |
0705.3532 | Hiroaki Nakajima | Katsushi Ito, Hiroaki Nakajima, Shin Sasaki | Deformation of Super Yang-Mills Theories in R-R 3-form Background | v2: reference added, v3: published version in JHEP | JHEP 0707:068,2007 | 10.1088/1126-6708/2007/07/068 | TIT/HEP-572, HIP-2007-29/TH | hep-th | null | We study deformation of N=2 and N=4 super Yang-Mills theories, which are
obtained as the low-energy effective theories on the (fractional) D3-branes in
the presence of constant Ramond-Ramond 3-form background. We calculate the
Lagrangian at the second order in the deformation parameter from open string
disk amplitudes. In N=4 case we find that all supersymmetries are broken for
generic deformation parameter but part of supersymmetries are unbroken for
special case. We also find that classical vacua admit fuzzy sphere
configuration. In N=2 case we determine the deformed supersymmetries. We
rewrite the deformed Lagrangians in terms of N=1 superspace, where the
deformation is interpreted as that of coupling constants.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:10:24 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 05:33:49 GMT"
},
{
"version": "v3",
"created": "Sat, 28 Jul 2007 12:44:21 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Ito",
"Katsushi",
""
],
[
"Nakajima",
"Hiroaki",
""
],
[
"Sasaki",
"Shin",
""
]
] |
0705.3533 | Takayuki Hirayama | Takayuki Hirayama, Koichi Yoshioka | Holographic Construction of Technicolor Theory | 23 pages; references added, minor changes | JHEP 0710:002,2007 | 10.1088/1126-6708/2007/10/002 | null | hep-ph hep-th | null | We construct a dual description of technicolor theory based on the D4/D8
brane configuration. A strongly-coupled technicolor theory is identified as the
effective theory on D-branes, and from the gauge/gravity correspondence, we
explore the weakly-coupled holographic description of dynamical electroweak
symmetry breaking. It is found from the D-brane probe action that the masses of
W and Z bosons are given by the decay constant of technipion, and the
technimesons become hierarchically heavy. Moreover, the couplings of heavier
modes to standard model fermions are rather suppressed. The oblique correction
parameters are also evaluated and found to be small except for the S parameter,
which can be reduced by modifying the model. The fermion fields are introduced
at the intersections of D-branes and their masses are generated via massive
gauge bosons from open strings stretching between D-branes.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:07:09 GMT"
},
{
"version": "v2",
"created": "Sat, 29 Sep 2007 11:55:35 GMT"
}
] | 2009-04-21T00:00:00 | [
[
"Hirayama",
"Takayuki",
""
],
[
"Yoshioka",
"Koichi",
""
]
] |
0705.3534 | Dariusz Chru\'sci\'nski | Dariusz Chruscinski, Andrzej Kossakowski | On circulant states with positive partial transpose | 15 pages; minor corrections | Phys. Rev. A 76, 032308 (2007) | 10.1103/PhysRevA.76.032308 | null | quant-ph | null | We construct a large class of quantum "d x d" states which are positive under
partial transposition (so called PPT states). The construction is based on
certain direct sum decomposition of the total Hilbert space displaying
characteristic circular structure - that is way we call them circulant states.
It turns out that partial transposition maps any such decomposition into
another one and hence both original density matrix and its partially transposed
partner share similar cyclic properties. This class contains many well known
examples of PPT states from the literature and gives rise to a huge family of
completely new states.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:16:11 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 15:06:28 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Jun 2007 12:02:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chruscinski",
"Dariusz",
""
],
[
"Kossakowski",
"Andrzej",
""
]
] |
0705.3535 | Hiroshi Kontani | H. Kontani, M. Naito, D.S. Hirashima, K. Yamada, and J. Inoue | Study of intrinsic spin and orbital Hall effects in Pt based on a (6s,
6p, 5d) tight-binding model | 5 pages | J. Phys. Soc. Jpn. 76 (2007) 103702 | 10.1143/JPSJ.76.103702 | null | cond-mat.mes-hall cond-mat.str-el | null | We study the origin of the intrinsic spin Hall conductivity (SHC) and the
d-orbital Hall conductivity (OHC) in Pt based on a multiorbital tight-binding
model with spin-orbit interaction. We find that the SHC reaches 1000
\hbar/e\Omega cm when the resistivity \rho is smaller than ~10 \mu\Omega cm,
whereas it decreases to 300 \hbar/e\Omega cm when \rho ~ 100 \mu\Omega cm. In
addition, the OHC is still larger than the SHC. The origin of huge SHE and OHE
in Pt is the large ``effective magnetic flux'' that is induced by the
interorbital transition between d_{xy}- and d_{x2-y2}-orbitals with the aid of
the strong spin-orbit interaction.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:21:07 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 04:27:44 GMT"
},
{
"version": "v3",
"created": "Tue, 8 Jan 2008 06:03:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kontani",
"H.",
""
],
[
"Naito",
"M.",
""
],
[
"Hirashima",
"D. S.",
""
],
[
"Yamada",
"K.",
""
],
[
"Inoue",
"J.",
""
]
] |
0705.3536 | Wolfgang Bietenholz | Wolfgang Bietenholz, Antonio Bigarini and Alessandro Torrielli | Area-preserving diffeomorphisms in gauge theory on a non-commutative
plane: a lattice study | 28 pages, 15 figures, published version | JHEP 0708:041,2007 | 10.1088/1126-6708/2007/08/041 | HU-EP-07/09, DESY-07-043, MIT-CTP 3827 | hep-lat hep-th | null | We consider Yang-Mills theory with the U(1) gauge group on a non-commutative
plane. Perturbatively it was observed that the invariance of this theory under
area-preserving diffeomorphisms (APDs) breaks down to a rigid subgroup SL(2,R).
Here we present explicit results for the APD symmetry breaking at finite gauge
coupling and finite non-commutativity. They are based on lattice simulations
and measurements of Wilson loops with the same area but with a variety of
different shapes. Our results are consistent with the expected loss of
invariance under APDs. Moreover, they strongly suggest that non-perturbatively
the SL(2,R) symmetry does not persist either.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:24:35 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Dec 2007 17:35:50 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Bietenholz",
"Wolfgang",
""
],
[
"Bigarini",
"Antonio",
""
],
[
"Torrielli",
"Alessandro",
""
]
] |
0705.3537 | Christian Robenhagen Ravnsh{\o}j | Christian Robenhagen Ravnshoj | p-torsion of Genus Two Curves Over Prime Fields of Characteristic p | 5 pages | null | null | null | math.AG math.NT | null | Consider the Jacobian of a hyperelliptic genus two curve defined over a prime
field of characteristic p and with complex multiplication. In this paper we
show that the p-Sylow subgroup of the Jacobian is either trivial or of order p.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:28:47 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Ravnshoj",
"Christian Robenhagen",
""
]
] |
0705.3538 | Ferenc Sikler | Ferenc Sikler (for the CMS Collaboration) | High Density QCD Physics with Heavy Ions in CMS | 4 pages, Presented at Moriond QCD and Hadronic interactions, La
Thuile, Italy, 23 March 2007 | null | null | null | nucl-ex | null | The heavy ion program of the CMS experiment will examine the QCD matter under
extreme conditions, through the study of global observables and specific
probes.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:30:06 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Sikler",
"Ferenc",
"",
"for the CMS Collaboration"
]
] |
0705.3539 | Konstantin S. Turitsyn | K.S. Turitsyn and S.S. Vergeles | Dynamics of wrinkles on a vesicle in external flow | 4 pages, 2 figures | null | 10.1103/PhysRevLett.100.028103 | null | cond-mat.soft | null | Recent experiments by Kantsler et. al. (2007) have shown that the
relaxational dynamics of a vesicle in external elongation flow is accompanied
by the formation of wrinkles on a membrane. Motivated by these experiments we
present a theory describing the dynamics of a wrinkled membrane. Formation of
wrinkles is related to the dynamical instability induced by negative surface
tension of the membrane. For quasi-spherical vesicles we perform analytical
study of the wrinkle structure dynamics. We derive the expression for the
instability threshold and identify three stages of the dynamics. The scaling
laws for the temporal evolution of wrinkling wavelength and surface tension are
established and confirmed numerically.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:52:48 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Turitsyn",
"K. S.",
""
],
[
"Vergeles",
"S. S.",
""
]
] |
0705.3540 | Sangmin Lee | Seok Kim, Sangmin Lee, Sungjay Lee, Jaemo Park | M2-brane Probe Dynamics and Toric Duality | 50 pages, 24 figures; v2. title changed, abstract and introduction
clarified. to appear in Nucl.Phys.B | Nucl.Phys.B797:340-370,2008 | 10.1016/j.nuclphysb.2008.01.012 | SNUST-070501 | hep-th | null | We study the dynamics of a single M2-brane probing toric Calabi-Yau four-fold
singularity in the context of the recently proposed M-theory crystal model of
AdS4/CFT3 dual pairs. We obtain an effective abelian gauge theory in which the
charges of the matter fields are given by the intersection numbers between
loops and faces in the crystal. We argue that the probe theory captures certain
aspects of the CFT3 even though the true M2-brane CFT is unlikely to be a usual
gauge theory. In particular, the moduli space of vacua of the gauge theory
coincides precisely with the Calabi-Yau singularity. Toric duality, partial
resolution, and a possibility of new RG flows are also discussed.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:32:52 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 01:50:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"Seok",
""
],
[
"Lee",
"Sangmin",
""
],
[
"Lee",
"Sungjay",
""
],
[
"Park",
"Jaemo",
""
]
] |
0705.3541 | Flavio S. Nogueira | Flavio S. Nogueira and Hagen Kleinert | Compact quantum electrodynamics in 2+1 dimensions and spinon
deconfinement: a renormalization group analysis | 10 pages, 1 figure; v2: references added | Phys.Rev.B77:045107,2008 | 10.1103/PhysRevB.77.045107 | null | cond-mat.str-el hep-ph | null | We discuss compact (2+1)-dimensional Maxwell electrodynamics coupled to
fermionic matter with N replica. For large enough N, the latter corresponds to
an effective theory for the nearest neighbor SU(N) Heisenberg antiferromagnet,
in which the fermions represent solitonic excitations known as spinons. Here we
show that the spinons are deconfined for $N>N_c=36$, thus leading to an
insulating state known as spin liquid. A previous analysis considerably
underestimated the value of $N_c$. We show further that for $20<N\leq 36$ there
can be either a confined or a deconfined phase, depending on the instanton
density. For $N\leq 20$ only the confined phase exist. For the physically
relevant value N=2 we argue that no paramagnetic phase can emerge, since chiral
symmetry breaking would disrupt it. In such a case a spin liquid or any other
nontrivial paramagnetic state (for instance, a valence-bond solid) is only
possible if doping or frustrating interactions are included.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:35:17 GMT"
},
{
"version": "v2",
"created": "Mon, 28 May 2007 14:46:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nogueira",
"Flavio S.",
""
],
[
"Kleinert",
"Hagen",
""
]
] |
0705.3542 | Hrvoje Nikolic | H. Nikolic | Is quantum field theory a genuine quantum theory? Foundational insights
on particles and strings | 10 pages, revised, new references, to appear in Europhys. Lett | Europhys. Lett.85:20003, 2009; Europhys.Lett.85:20003,2009 | 10.1209/0295-5075/85/20003 | null | hep-th hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Practically measurable quantities resulting from quantum field theory are not
described by hermitian operators, contradicting one of the cornerstone axioms
of orthodox quantum theory. This could be a sign that some of the axioms of
orthodox quantum theory should be reformulated. A non-orthodox reformulation of
quantum theory based on integral curves of particle currents is advocated and
possible measurable manifestations are discussed. The consistency with particle
creation and destruction requires particles to be extended objects, which can
be viewed as a new derivation of string theory. Within this reformulation, an
indirect low-energy test of string theory is also possible.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:38:44 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 11:45:57 GMT"
},
{
"version": "v3",
"created": "Tue, 16 Dec 2008 10:57:58 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Nikolic",
"H.",
""
]
] |
0705.3543 | Konstantin S. Turitsyn | V. V. Lebedev, K. S. Turitsyn, and S. S. Vergeles | Nearly spherical vesicles in an external flow | 20 pages, 5 figures | null | null | null | cond-mat.soft | null | Tank-treading, tumbling and trembling are different types of the vesicle
behavior in an external flow. We derive a dynamical equation for nearly
spherical vesicles enabling to establish a phase diagram of the system
predicting the regimes. The diagram is drawn in terms of two dimensionless
parameters depending on the vesicle excess area, fluid viscosities, membrane
viscosity and bending modulus, strength of the flow, and ratio of the
elongational and rotational components of the flow. The tank-treading to
tumbling transition occurs via a saddle-node bifurcation whereas the
tank-treading to trembling transition occurs via a Hopf bifurcation. We
establish a critical slowing near the merging point of the transition lines.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 16:37:24 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Lebedev",
"V. V.",
""
],
[
"Turitsyn",
"K. S.",
""
],
[
"Vergeles",
"S. S.",
""
]
] |
0705.3544 | Alexander E. Hramov | Alexander E. Hramov and Alexey A. Koronovskii and Vladimir I.
Ponomarenko and Mikhail D. Prokhorov | Detection of synchronization from univariate data using wavelet
transform | 10 pages, 9 figures | PHYSICAL REVIEW E 75 (2007) 056207 | 10.1103/PhysRevE.75.056207 | null | nlin.CD | null | A method is proposed for detecting from univariate data the presence of
synchronization of a self-sustained oscillator by external driving with varying
frequency. The method is based on the analysis of difference between the
oscillator instantaneous phases calculated using continuous wavelet transform
at time moments shifted by a certain constant value relative to each other. We
apply our method to a driven asymmetric van der Pol oscillator, experimental
data from a driven electronic oscillator with delayed feedback and human
heartbeat time series. In the latest case, the analysis of the heart rate
variability data reveals synchronous regimes between the respiration and slow
oscillations in blood pressure.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:50:07 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Hramov",
"Alexander E.",
""
],
[
"Koronovskii",
"Alexey A.",
""
],
[
"Ponomarenko",
"Vladimir I.",
""
],
[
"Prokhorov",
"Mikhail D.",
""
]
] |
0705.3545 | Antonio Maria Scarfone | P. Quarati and A.M. Scarfone | Modified Debye-Huckel Electron Shielding and Penetration Factor | 9 pages, 3 figures, 3 tables | Astrophys.J.666:1303-1310,2007 | 10.1086/520058 | null | astro-ph cond-mat.stat-mech nucl-th physics.plasm-ph | null | Screened potential, modified by non standard electron cloud distributions
responsible for the shielding effect on fusion of reacting nuclei in
astrophysical plasmas, is derived. The case of clouds with depleted tails in
space coordinates is discussed. The modified screened potential is obtained
both from statistical mechanics arguments based on fluctuations of the inverse
of the Debye-Huckel radius and from the solution of a Bernoulli equation used
in generalized statistical mechanics. Plots and tables useful in evaluating
penetration probability at any energy are provided.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:58:54 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 16:43:18 GMT"
},
{
"version": "v3",
"created": "Mon, 24 Sep 2007 13:11:55 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Quarati",
"P.",
""
],
[
"Scarfone",
"A. M.",
""
]
] |
0705.3546 | Xiong Chuanhua | Chuan-Hua Xiong | The Hodge Dual Symmetry of the Green-Schwarz Superstring in $AdS_5
\otimes S^5$ | null | Commun.Theor.Phys.49:1573-1576,2008 | 10.1088/0253-6102/49/6/46 | null | hep-th | null | The hidden symmetry and an infinite set non-local conserved currents of the
Green-Schwarz superstring on $AdS_5\otimes S^5$ have been pointed out by Bena
et al. In this paper, we shown that the Hodge dual between the Maurer-Cartan
equation and the equation of motion gives the hidden symmetry in the moduli
space of Green-Schwarz superstring. Thus by twisty transforming the vielbeins,
we can express the currents of the paper$^{\cite{bpr}}$ as the Lax connections
by a unique spectral parameter.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 09:58:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Xiong",
"Chuan-Hua",
""
]
] |
0705.3547 | Kohei Hamaya | H. Takahashi, M. Kawamura, S. Masubuchi, K. Hamaya, T. Machida, Y.
Hashimoto and S. Katsumoto | Electrical coherent control of nuclear spins in a breakdown regime of
quantum Hall effect | 3 pages, 4 figures | Appl. Phys. Lett. 91, 092129 (2007) | 10.1063/1.2778465 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Using a conventional Hall-bar geometry with a micro-metal strip on top of the
surface, we demonstrate an electrical coherent control of nuclear spins in an
AlGaAs/GaAs semiconductor heterostructure. A breakdown of integer quantum Hall
(QH) effect is utilized to dynamically polarize nuclear spins. By applying a
pulse rf magnetic field with the metal strip, the quantum state of the nuclear
spins shows Rabi oscillations, which is detected by measuring longitudinal
voltage of the QH conductor.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:44:38 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 01:50:21 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Sep 2007 17:06:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takahashi",
"H.",
""
],
[
"Kawamura",
"M.",
""
],
[
"Masubuchi",
"S.",
""
],
[
"Hamaya",
"K.",
""
],
[
"Machida",
"T.",
""
],
[
"Hashimoto",
"Y.",
""
],
[
"Katsumoto",
"S.",
""
]
] |
0705.3548 | Olli Luukkonen | Olli Luukkonen, Constantin Simovski, G\'erard Granet, George
Goussetis, Dmitri Lioubtchenko, Antti V. R\"ais\"anen, and Sergei Tretyakov | Simple and accurate analytical model of planar grids and high-impedance
surfaces comprising metal strips or patches | 12 pages, 10 figures, submitted to IEEE Transactions on Antennas and
Propagation | IEEE Transactions on Antennas and Propagation, Vol. 56, No. 6, pp.
1624--1632, June 2008. | 10.1109/TAP.2008.923327 | null | physics.class-ph | null | This paper introduces simple analytical formulas for the grid impedance of
electrically dense arrays of square patches and for the surface impedance of
high-impedance surfaces based on the dense arrays of metal strips or square
patches over ground planes. Emphasis is on the oblique-incidence excitation.
The approach is based on the known analytical models for strip grids combined
with the approximate Babinet principle for planar grids located at a dielectric
interface. Analytical expressions for the surface impedance and reflection
coefficient resulting from our analysis are thoroughly verified by full-wave
simulations and compared with available data in open literature for particular
cases. The results can be used in the design of various antennas and microwave
or millimeter wave devices which use artificial impedance surfaces and
artificial magnetic conductors (reflect-array antennas, tunable phase shifters,
etc.), as well as for the derivation of accurate higher-order impedance
boundary conditions for artificial (high-) impedance surfaces. As an example,
the propagation properties of surface waves along the high-impedance surfaces
are studied.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 10:04:34 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Apr 2008 10:32:14 GMT"
},
{
"version": "v3",
"created": "Fri, 2 May 2008 10:06:14 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Luukkonen",
"Olli",
""
],
[
"Simovski",
"Constantin",
""
],
[
"Granet",
"Gérard",
""
],
[
"Goussetis",
"George",
""
],
[
"Lioubtchenko",
"Dmitri",
""
],
[
"Räisänen",
"Antti V.",
""
],
[
"Tretyakov",
"Sergei",
""
]
] |
0705.3549 | Luis L. Sanchez. Soto | R. Alvargonzalez and L. S. Soto | Suggestions on photons and fermions | Typos corrected. Comments welcome | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we suggest a configuration of photons consistent with a spin
$\hbar$, and a configuration of the fermions coherent with a spin $\hbar/2$.
These suggested configurations open the way to further analyses which lead to
the following conclusions:
- There cannot exist elementary particles of spin $\hbar/2$ with a mass
inferior to $1m_e$ or with a radius greater than $1l_e$.
- The electrostatic force derives from the centrifugal forces inherent to the
spin and are propagated by photons.
- The derivation of the electrostatic force explains the existence of
positive and negative charges and Coulomb's law.
- The enormous differences between the centrifugal forces and the centripetal
forces at the surface of the protons give rise to quantic fluctuations of space
which generate the energy flows necessary for equilibrium. These energy flows
can explain gravitation and the strong force.
- The mass of the proton, $m_p$, and the mass of the neutron, $m_n$, must
each have a concrete value required for the cohesion of the atomic nuclei. The
suggested hypoteses show that the relation $m_n/m_p$ must be very slightly
greater than 1.00, and that, by a first approximation, both $m_n$ and $m_p$
must be slightly less than 1851 $m_e$.
- There are no "gravitons" and no "gluons"; the "messenger particles" are
always the very real photons.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 10:08:33 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 09:23:07 GMT"
},
{
"version": "v3",
"created": "Fri, 10 Oct 2008 10:25:01 GMT"
},
{
"version": "v4",
"created": "Fri, 17 Apr 2009 09:09:55 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Alvargonzalez",
"R.",
""
],
[
"Soto",
"L. S.",
""
]
] |
0705.3550 | Harald Merkel | H. Merkel, P. Achenbach, C. A. Ayerbe Gayoso, J. C. Bernauer, R.
B\"ohm, D. Bosnar, B. Cheymol, M. O. Distler, L. Doria, H. Fonvieille, J.
Friedrich, P. Janssens, M. Makek, U. M\"uller, L. Nungesser, J. Pochodzalla,
M. Potokar, S. S\'anchez Majos, B. S. Schlimme, S. \v{S}irca, L. Tiator, Th.
Walcher, M. Weinriefer | Recoil polarization and beam-recoil double polarization measurement of
\eta electroproduction on the proton in the region of the S_{11}(1535)
resonance | 4 pages, 1 figure | Phys.Rev.Lett.99:132301,2007 | 10.1103/PhysRevLett.99.132301 | null | nucl-ex | null | The beam-recoil double polarization P_{x'}^h and P_{z'}^h and the recoil
polarization P_{y'} were measured for the first time for the
p(\vec{e},e'\vec{p})\eta reaction at a four-momentum transfer of Q^2=0.1
GeV^2/c^2 and a center of mass production angle of \theta = 120^\circ at MAMI
C. With a center of mass energy range of 1500 MeV < W < 1550 MeV the region of
the S_{11}(1535) and D_{13}(1520) resonance was covered. The results are
discussed in the framework of a phenomenological isobar model (Eta-MAID). While
P_{x'}^h and P_{z'}^h are in good agreement with the model, P_{y'} shows a
significant deviation, consistent with existing photoproduction data on the
polarized-target asymmetry.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 10:15:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Merkel",
"H.",
""
],
[
"Achenbach",
"P.",
""
],
[
"Gayoso",
"C. A. Ayerbe",
""
],
[
"Bernauer",
"J. C.",
""
],
[
"Böhm",
"R.",
""
],
[
"Bosnar",
"D.",
""
],
[
"Cheymol",
"B.",
""
],
[
"Distler",
"M. O.",
""
],
[
"Doria",
"L.",
""
],
[
"Fonvieille",
"H.",
""
],
[
"Friedrich",
"J.",
""
],
[
"Janssens",
"P.",
""
],
[
"Makek",
"M.",
""
],
[
"Müller",
"U.",
""
],
[
"Nungesser",
"L.",
""
],
[
"Pochodzalla",
"J.",
""
],
[
"Potokar",
"M.",
""
],
[
"Majos",
"S. Sánchez",
""
],
[
"Schlimme",
"B. S.",
""
],
[
"Širca",
"S.",
""
],
[
"Tiator",
"L.",
""
],
[
"Walcher",
"Th.",
""
],
[
"Weinriefer",
"M.",
""
]
] |
0705.3551 | Alexander Burinskii | Alexander Burinskii, Emilio Elizalde, Sergi R. Hildebrandt, Giulio
Magli | Aligned electromagnetic excitations of a black hole and their impact on
its quantum horizon | 7 pages, 2 figures, final version published in PhysLetB | Phys.Lett.B671:486-492,2009 | 10.1016/j.physletb.2008.12.031 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that elementary aligned electromagnetic excitations of black holes,
as coming from exact Kerr-Schild solutions, represent light-like beam pulses
which have a very strong back reaction on the metric and change the topology of
the horizon.
Based on York's proposal, that elementary deformations of the BH horizon are
related with elementary vacuum fluctuations, we analyze deformation of the
horizon caused by the beam-like vacuum fluctuations and obtain a very specific
feature of the topological deformations of the horizon. In particular, we show
how the beams pierce the horizon, forming a multitude of micro holes in it. A
conjecture is taken into consideration, that these specific excitations are
connected with the conformal-analytic properties of the Kerr geometry and are
at the base of the emission mechanism.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 10:24:54 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Dec 2007 13:00:47 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Dec 2007 15:03:18 GMT"
},
{
"version": "v4",
"created": "Thu, 22 May 2008 10:38:49 GMT"
},
{
"version": "v5",
"created": "Mon, 29 Dec 2008 13:12:06 GMT"
}
] | 2009-02-02T00:00:00 | [
[
"Burinskii",
"Alexander",
""
],
[
"Elizalde",
"Emilio",
""
],
[
"Hildebrandt",
"Sergi R.",
""
],
[
"Magli",
"Giulio",
""
]
] |
0705.3552 | Bruno Andreotti | Ivan Sanchez, Franck Raynaud, Jose Lanuza, Bruno Andreotti, Eric
Clement, Igor S. Aranson | Spreading of a granular droplet | 4 pages, 3 figures | null | 10.1103/PhysRevE.76.060301 | null | cond-mat.soft | null | The influence of controlled vibrations on the granular rheology is
investigated in a specifically designed experiment. We study experimentally a
thin granular film spreading under the action of horizontal vibrations. A
nonlinear diffusion equation is derived theoretically that describes the
evolution of the deposit shape. A self-similar parabolic shape (the``granular
droplet'') and a spreading dynamics are predicted that both agree
quantitatively with the experimental results. The theoretical analysis is used
to extract effective dynamic friction coefficients between the base and the
granular layer under sustained and controlled vibrations. We derive an
empirical friction law involving external driving parameters and the layer
height to represent our data.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 10:32:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sanchez",
"Ivan",
""
],
[
"Raynaud",
"Franck",
""
],
[
"Lanuza",
"Jose",
""
],
[
"Andreotti",
"Bruno",
""
],
[
"Clement",
"Eric",
""
],
[
"Aranson",
"Igor S.",
""
]
] |
0705.3553 | Jonathan M. Flynn | Jonathan M Flynn, Juan Nieves | |Vub| from exclusive semileptonic B to pi decays revisited | 5 pages, 1 figure. Version accepted for publication | Phys.Rev.D76:031302,2007 | 10.1103/PhysRevD.76.031302 | null | hep-ph | null | We update the extraction of |Vub| from exclusive semileptonic B to pi decays,
combining experimental partial branching fraction information with theoretical
form factor calculations, using the recently revised HPQCD results for the form
factors f_+ and f_0. We use Omnes representations to provide the required
parametrisations of the form factors. The extracted value is 10^3 |Vub| =
3.47+/-0.29+/-0.03, in striking agreement with |Vub| extracted using all other
inputs in CKM fits and showing some disagreement with |Vub| extracted from
inclusive semileptonic B to pi decays.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 10:39:49 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 13:49:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Flynn",
"Jonathan M",
""
],
[
"Nieves",
"Juan",
""
]
] |
0705.3554 | Andrzej Wereszczynski | C. Adam, J. Sanchez-Guillen, A. Wereszczynski | k-defects as compactons | the stability proof of Section 4.4 corrected, some references added | J.Phys.A40:13625-13643,2007; Erratum-ibid.A42:089801,2009 | 10.1088/1751-8113/40/45/009 10.1088/1751-8121/42/8/089801 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that topological compactons (solitons with compact support) may be
quite common objects if $k$-fields, i.e., fields with nonstandard kinetic term,
are considered, by showing that even for models with well-behaved potentials
the unusual kinetic part may lead to a power-like approach to the vacuum, which
is a typical signal for the existence of compactons. The related approximate
scaling symmetry as well as the existence of self-similar solutions are also
discussed. As an example, we discuss domain walls in a potential Skyrme model
with an additional quartic term, which is just the standard quadratic term to
the power two. We show that in the critical case, when the quadratic term is
neglected, we get the so-called quartic $\phi^4$ model, and the corresponding
topological defect becomes a compacton. Similarly, the quartic sine-Gordon
compacton is also derived. Finally, we establish the existence of topological
half-compactons and study their properties.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 10:44:04 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 10:38:22 GMT"
},
{
"version": "v3",
"created": "Mon, 19 Nov 2007 11:19:29 GMT"
},
{
"version": "v4",
"created": "Fri, 6 Feb 2009 17:58:43 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Adam",
"C.",
""
],
[
"Sanchez-Guillen",
"J.",
""
],
[
"Wereszczynski",
"A.",
""
]
] |
0705.3555 | Albert Guill\'en i F\`abregas | Albert Guillen i Fabregas and Giuseppe Caire | Multidimensional Coded Modulation in Block-Fading Channnels | to appear IEEE Transactions on Information Theory | null | null | null | cs.IT math.IT | null | We study the problem of constructing coded modulation schemes over
multidimensional signal sets in Nakagami-$m$ block-fading channels. In
particular, we consider the optimal diversity reliability exponent of the error
probability when the multidimensional constellation is obtained as the rotation
of classical complex-plane signal constellations. We show that multidimensional
rotations of full dimension achieve the optimal diversity reliability exponent,
also achieved by Gaussian constellations. Multidimensional rotations of full
dimension induce a large decoding complexity, and in some cases it might be
beneficial to use multiple rotations of smaller dimension. We also study the
diversity reliability exponent in this case, which yields the optimal
rate-diversity-complexity tradeoff in block-fading channels with discrete
inputs.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:06:23 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Nov 2007 15:07:52 GMT"
}
] | 2007-11-26T00:00:00 | [
[
"Fabregas",
"Albert Guillen i",
""
],
[
"Caire",
"Giuseppe",
""
]
] |
0705.3556 | Wenjun Liu | Wen-jun Liu, Qiao-ling Xue, Jian-wei Dong | New Generalization of Perturbed Ostrowski Type Inequalities and
Applications | 11 pages, | null | null | null | math.FA math.NA | null | Generalizations of Ostrowski type inequality for functions of Lipschitzian
type are established. Applications in numerical integration and cumulative
distribution functions are also given.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:16:55 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Liu",
"Wen-jun",
""
],
[
"Xue",
"Qiao-ling",
""
],
[
"Dong",
"Jian-wei",
""
]
] |
0705.3557 | Mete Atature | Jan Dreiser, Mete Atature, Christophe Galland, Tina Muller, Antonio
Badolato, and Atac Imamoglu | Optical investigations of quantum-dot spin dynamics | submitted to Physical Review B, 19 Pages in RevTeX4 format | null | null | null | cond-mat.mes-hall quant-ph | null | We have performed all-optical measurements of spin relaxation in single
self-assembled InAs/GaAs quantum dots (QD) as a function of static external
electric and magnetic fields. To study QD spin dynamics we measure the degree
of resonant absorption which results from a competition between optical spin
pumping induced by the resonant laser field and spin relaxation induced by
reservoirs. Fundamental interactions that determine spin dynamics in QDs are
hyperfine coupling to QD nuclear spin ensembles, spin-phonon coupling and
exchange-type interactions with a nearby Fermi sea of electrons. We show that
the strength of spin relaxation generated by the three fundamental interactions
can be changed by up to five orders of magnitude upon varying the applied
electric and magnetic fields. We find that the strength of optical spin pumping
that we use to study the spin relaxation is determined predominantly by
hyperfine-induced mixing of single-electron spin states at low magnetic fields
and heavy-light hole mixing at high magnetic fields. Our measurements allow us
to determine the rms value of the hyperfine (Overhauser) field to be ~15 mTesla
with an electron g-factor of g_e=0.6 and a hole mixing strength of |epsilon|^2
= 0.0005.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:41:05 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Dreiser",
"Jan",
""
],
[
"Atature",
"Mete",
""
],
[
"Galland",
"Christophe",
""
],
[
"Muller",
"Tina",
""
],
[
"Badolato",
"Antonio",
""
],
[
"Imamoglu",
"Atac",
""
]
] |
0705.3558 | James Bolton | James S. Bolton (MPA), Martin G. Haehnelt (IoA) | A closer look at using quasar near-zones as a probe of neutral hydrogen
in the intergalactic medium | 6 pages, 3 figures, accepted for publication in MNRAS letters | null | 10.1111/j.1745-3933.2007.00361.x | null | astro-ph | null | We examine a large set of synthetic quasar spectra to realistically assess
the potential of using the relative sizes of highly ionized near-zones in the
Lya and Lyb forest as a probe of the neutral hydrogen content of the
intergalactic medium (IGM) at z>6. The scatter in the relative near-zone size
distribution, induced by underlying fluctuations in the baryonic density field
and the filtering of ionizing radiation, is considerable even for fixed
assumptions about the IGM neutral fraction. As a consequence, the current
observational data cannot distinguish between an IGM which is significantly
neutral or highly ionized just above z=6. Under standard assumptions for quasar
ages and ionizing luminosities, a future sample of several tens of high
resolution Lya and Lyb near-zone spectra should be capable of distinguishing
between a volume weighted neutral hydrogen fraction in the IGM which is greater
or less than 10 per cent.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:21:47 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jul 2007 12:24:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bolton",
"James S.",
"",
"MPA"
],
[
"Haehnelt",
"Martin G.",
"",
"IoA"
]
] |
0705.3559 | Sylvain Gol\'enia | Sylvain Gol\'enia and Sergiu Moroianu | The spectrum of Schr\"odinger operators and Hodge Laplacians on
conformally cusp manifolds | Updated, 30 pages | Trans. Amer. Math. Soc. 364 (2012), 1-29 | null | null | math.SP math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the spectrum of the $k$-form Laplacian on conformally cusp
Riemannian manifolds. The essential spectrum is shown to vanish precisely when
the $k$ and $k-1$ de Rham cohomology groups of the boundary vanish. We give
Weyl-type asymptotics for the eigenvalue-counting function in the purely
discrete case. In the other case we analyze the essential spectrum via positive
commutator methods and establish a limiting absorption principle. This implies
the absence of the singular spectrum for a wide class of metrics. We also
exhibit a class of potentials $V$ such that the Schr\"odinger operator has
compact resolvent, although $V$ tends to $-\infty$ in most of the infinity. We
correct a statement from the literature regarding the essential spectrum of the
Laplacian on forms on hyperbolic manifolds of finite volume, and we propose a
conjecture about the existence of such manifolds in dimension four whose cusps
are rational homology spheres.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:26:50 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Apr 2008 14:32:18 GMT"
},
{
"version": "v3",
"created": "Mon, 8 Dec 2008 10:55:07 GMT"
}
] | 2014-02-12T00:00:00 | [
[
"Golénia",
"Sylvain",
""
],
[
"Moroianu",
"Sergiu",
""
]
] |
0705.3560 | James Colliander | J. Colliander | Cubic Derivative Nonlinear Schrodinger has Blowup Solutions | 2 pages | null | null | null | math.AP math-ph math.MP | null | This paper is painfully withdrawn.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 17:44:57 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 21:56:58 GMT"
},
{
"version": "v3",
"created": "Sun, 3 Jun 2007 01:22:42 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Colliander",
"J.",
""
]
] |
0705.3561 | Lucas Bordeaux | Lucas Bordeaux, Marco Cadoli, Toni Mancini | Generalizing Consistency and other Constraint Properties to Quantified
Constraints | null | null | null | null | cs.LO cs.AI | null | Quantified constraints and Quantified Boolean Formulae are typically much
more difficult to reason with than classical constraints, because quantifier
alternation makes the usual notion of solution inappropriate. As a consequence,
basic properties of Constraint Satisfaction Problems (CSP), such as consistency
or substitutability, are not completely understood in the quantified case.
These properties are important because they are the basis of most of the
reasoning methods used to solve classical (existentially quantified)
constraints, and one would like to benefit from similar reasoning methods in
the resolution of quantified constraints. In this paper, we show that most of
the properties that are used by solvers for CSP can be generalized to
quantified CSP. This requires a re-thinking of a number of basic concepts; in
particular, we propose a notion of outcome that generalizes the classical
notion of solution and on which all definitions are based. We propose a
systematic study of the relations which hold between these properties, as well
as complexity results regarding the decision of these properties. Finally, and
since these problems are typically intractable, we generalize the approach used
in CSP and propose weaker, easier to check notions based on locality, which
allow to detect these properties incompletely but in polynomial time.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:27:55 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Bordeaux",
"Lucas",
""
],
[
"Cadoli",
"Marco",
""
],
[
"Mancini",
"Toni",
""
]
] |
0705.3562 | P\'eter Sz\'ekely | P. Sz\'ekely, L. L. Kiss, K. Szatm\'ary, B. Cs\'ak, G. \'A. Bakos, T.
R. Bedding | Radial velocities of five globular clusters obtained with AAOmega | 4 pages, 6 figures, accepted for publication by Astronomische
Nachrichten | null | 10.1002/asna.200710819 | null | astro-ph | null | Using the recently commissioned multi-object spectrograph AAOmega on the 3.9m
AAT we have obtained medium-resolution near-infrared spectra for 10,500 stars
in and around five southern globular clusters. The targets were 47 Tuc, M12,
M30, M55 and NGC 288. We have measured radial velocities to +/- 1 km/s with the
cross correlation method and estimated metallicity, effective temperature,
surface gra vity and rotational velocity for each star by fitting synthetic
model spectra. An analysis of the velocity maps and velocity dispersion of
member stars revealed systemic rotation in four of the target clusters.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:37:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Székely",
"P.",
""
],
[
"Kiss",
"L. L.",
""
],
[
"Szatmáry",
"K.",
""
],
[
"Csák",
"B.",
""
],
[
"Bakos",
"G. Á.",
""
],
[
"Bedding",
"T. R.",
""
]
] |
0705.3563 | Benjamin Winkel | B. Winkel (1 and 2) and J. Kerp (2) ((1) Max-Planck-Institut fuer
Radioastronomie (MPIfR), Bonn, Germany, (2) Argelander-Institut fuer
Astronomie (AIfA), University of Bonn, Germany) | The Robustness of Least-Squares Frequency Switching (LSFS) | 17 pages, 21 figures, 1 table, accepted for publication in ApJS
(November 2007, v173n1) | Astrophys.J.Suppl.173:166-176,2007 | 10.1086/520050 | null | astro-ph | null | Least-squares frequency switching (LSFS) is a new method to reconstruct
signal and gain function (known as bandpass or baseline) from spectral line
observations using the frequency switching method. LSFS utilizes not only two
but a set of three or more local oscillator (LO) frequencies. The
reconstruction is based on a least squares fitting scheme. Here we present a
detailed investigation on the stability of the LSFS method in a statistical
sense and test the robustness against radio frequency interference (RFI),
receiver gain instabilities and continuum sources. It turns out, that the LSFS
method is indeed a very powerful method and is robust against most of these
problems. Nevertheless, LSFS fails in presence of RFI signals or strong line
emission. We present solutions to overcome these limitations using a flagging
mechanism or remapping of measured signals, respectively.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:41:12 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 08:30:31 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Winkel",
"B.",
"",
"1 and 2"
],
[
"Kerp",
"J.",
""
]
] |
0705.3564 | Hao Xu | Kefeng Liu and Hao Xu | New results of intersection numbers on moduli spaces of curves | 9 pages, a brief survey | Proc.Nat.Acad.Sci.104:13896-13900,2007 | 10.1073/pnas.0705910104 | null | math.AG hep-th | null | We present a series of new results we obtained recently about the
intersection numbers of tautological classes on moduli spaces of curves,
including a simple formula of the n-point functions for Witten's $\tau$
classes, an effective recursion formula to compute higher Weil-Petersson
volumes, several new recursion formulae of intersection numbers and our proof
of a conjecture of Itzykson and Zuber concerning denominators of intersection
numbers. We also present Virasoro and KdV properties of generating functions of
general mixed $\kappa$ and $\psi$ intersections.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:44:27 GMT"
}
] | 2011-03-31T00:00:00 | [
[
"Liu",
"Kefeng",
""
],
[
"Xu",
"Hao",
""
]
] |
0705.3565 | Caroline Champenois | Caroline Champenois (PIIM), Gaetan Hagel (PIIM), Marie Houssin (PIIM),
Martina Knoop (PIIM), Cedric Zumsteg (PIIM), Fernande Vedel (PIIM) | Terahertz frequency standard based on three-photon coherent population
trapping | article soumis a PRL le 21 mars 2007, accepte le 10 mai, version 2
(24/05/2007) | Physical Review Letters 99 (2007) 013001 | 10.1103/PhysRevLett.99.013001 | null | quant-ph | null | A scheme for a THz frequency standard based on three-photon coherent
population trapping in stored ions is proposed. Assuming the propagation
directions of the three lasers obey the phase matching condition, we show that
stability of few 10$^{-14}$ at one second can be reached with a precision
limited by power broadening to $10^{-11}$ in the less favorable case. The
referenced THz signal can be propagated over long distances, the useful
information being carried by the relative frequency of the three optical
photons.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 11:56:48 GMT"
}
] | 2014-04-16T00:00:00 | [
[
"Champenois",
"Caroline",
"",
"PIIM"
],
[
"Hagel",
"Gaetan",
"",
"PIIM"
],
[
"Houssin",
"Marie",
"",
"PIIM"
],
[
"Knoop",
"Martina",
"",
"PIIM"
],
[
"Zumsteg",
"Cedric",
"",
"PIIM"
],
[
"Vedel",
"Fernande",
"",
"PIIM"
]
] |
0705.3566 | Jiangfeng Du | Jiangfeng Du, Jing Zhu, Mingjun Shi, Xinhua Peng, and Dieter Suter | Experimental Observation of a Topological Phase in the Maximally
Entangled State of a Pair of Qubits | null | null | 10.1103/PhysRevA.76.042121 | null | quant-ph | null | Quantum mechanical phase factors can be related to dynamical effects or to
the geometrical properties of a trajectory in a given space - either parameter
space or Hilbert space. Here, we experimentally investigate a quantum
mechanical phase factor that reflects the topology of the SO(3) group: since
rotations by $\pi$ around antiparallel axes are identical, this space is doubly
connected. Using pairs of nuclear spins in a maximally entangled state, we
subject one of the spins to a cyclic evolution. If the corresponding trajectory
in SO(3) can be smoothly deformed to a point, the quantum state at the end of
the trajectory is identical to the initial state. For all other trajectories
the quantum state changes sign.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:03:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Du",
"Jiangfeng",
""
],
[
"Zhu",
"Jing",
""
],
[
"Shi",
"Mingjun",
""
],
[
"Peng",
"Xinhua",
""
],
[
"Suter",
"Dieter",
""
]
] |
0705.3567 | J\"org Sichelschmidt | J. Wykhoff, J. Sichelschmidt, G. Lapertot, G. Knebel, J. Flouquet,
I.I. Fazlishanov, H.-A. Krug von Nidda, C. Krellner, C. Geibel, F. Steglich | ESR of YbRh2Si2 and 174YbRh2Si2 : local and itinerant properties | 3 Figures | Science Techn. Adv. Mat. 8, 389 (2007) | 10.1016/j.stam.2007.07.005 | null | cond-mat.str-el | null | Below the Kondo temperature the heavy Fermion compound YbRh$_{2}$Si$_{2}$
shows a well defined Electron Spin Resonance (ESR) with local Yb$^{3+}$
properties. We report a detailed analysis of the ESR intensity which gives
information on the number of ESR active centers relative to the ESR of well
localized Yb$^{3+}$ in YPd$_3$:Yb. The ESR lineshape is investigated regarding
contributions from itinerant centers. From the ESR of monoisotopic
$^{174}$YbRh$_{2}$Si$_{2}$ we could exclude unresolved hyperfine contributions
to the lineshape.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:23:50 GMT"
}
] | 2010-03-04T00:00:00 | [
[
"Wykhoff",
"J.",
""
],
[
"Sichelschmidt",
"J.",
""
],
[
"Lapertot",
"G.",
""
],
[
"Knebel",
"G.",
""
],
[
"Flouquet",
"J.",
""
],
[
"Fazlishanov",
"I. I.",
""
],
[
"von Nidda",
"H. -A. Krug",
""
],
[
"Krellner",
"C.",
""
],
[
"Geibel",
"C.",
""
],
[
"Steglich",
"F.",
""
]
] |
0705.3568 | Iman Sargolzahi | Iman Sargolzahi, Sayyed Yahya Mirafzali, Mohsen Sarbishaei | Thermal entanglement in a two-qutrit system with nonlinear coupling
under nonuniform external magnetic field | 18 pages, 6 figures; The revised version, Some more sections and
references are added | Int. J. Quant. Inform. 6 (2008) 867 | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermal entanglement of a 2-qutrit spin chain with nonlinear
coupling in the presence of nonuniform magnetic field. Thermal entanglement of
an arbitrary (finite dimensional) m-partite system vanishes at some finite
threshold temperature T_s. We investigate the dependence of T_s on the system's
parameters, i.e. the nonlinear coupling and the magnetic field, for this
2-qutrit system. In addition, we compare two lower bounds of I-concurrence for
this system and also study its dense coding capacity as a function of system's
parameters.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:25:03 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Nov 2008 11:40:30 GMT"
}
] | 2008-11-04T00:00:00 | [
[
"Sargolzahi",
"Iman",
""
],
[
"Mirafzali",
"Sayyed Yahya",
""
],
[
"Sarbishaei",
"Mohsen",
""
]
] |
0705.3569 | Alexander Seel | Alexander Seel, Tanaya Bhattacharyya, Frank G\"ohmann, Andreas
Kl\"umper | A note on the spin-1/2 XXZ chain concerning its relation to the Bose gas | continued in 0710.1814 math-ph | J. Stat. Mech. (2007) P08030 | 10.1088/1742-5468/2007/08/P08030 | null | cond-mat.stat-mech hep-th math-ph math.MP | null | By considering the one-particle and two-particle scattering data of the
spin-1/2 Heisenberg chain at T=0 we derive a continuum limit relating the spin
chain to the 1D Bose gas. Applying this limit to the quantum transfer matrix
approach of the Heisenberg chain we obtain expressions for the correlation
functions of the Bose gas at arbitrary temperatures.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 16:31:53 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 10:27:12 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Oct 2007 16:29:07 GMT"
}
] | 2007-10-09T00:00:00 | [
[
"Seel",
"Alexander",
""
],
[
"Bhattacharyya",
"Tanaya",
""
],
[
"Göhmann",
"Frank",
""
],
[
"Klümper",
"Andreas",
""
]
] |
0705.3570 | Pierre Nolin | Lincoln Chayes, Pierre Nolin | Large Scale Properties of the IIIC for 2D Percolation | 19 pages, 2 figures | null | null | null | math.PR | null | We reinvestigate the 2D problem of the inhomogeneous incipient infinite
cluster where, in an independent percolation model, the density decays to p_c
with an inverse power, \lambda, of the distance to the origin. Assuming the
existence of critical exponents (as is known in the case of the triangular site
lattice) if the power is less than 1/\nu, with \nu the correlation length
exponent, we demonstrate an infinite cluster with scale dimension given by
D_H=2-\beta\lambda. Further, we investigate the critical case \lambda_c=1/\nu
and show that iterated logarithmic corrections will tip the balance between the
possibility and impossibility of an infinite cluster.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:40:40 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Chayes",
"Lincoln",
""
],
[
"Nolin",
"Pierre",
""
]
] |
0705.3571 | Jean Cviklinski | J. Cviklinski, A. Dantan, J. Ortalo, M. Pinard | Conditionnal squeezing of an atomic alignement | 7 pages, 2 figures | Phys. Rev. A 76, 033830 (2007) | 10.1103/PhysRevA.76.033830 | null | quant-ph | null | We investigate the possibility to perform a Quantum Non Demolition
measurement of the collective alignment of an atomic ensemble in the case of a
$F\geq 1$ spin. We compare the case of purely vectorial and purely tensorial
Hamiltonians and show how to achieve conditional squeezing or entanglement of
atomic alignment components.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:42:13 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Aug 2007 09:40:40 GMT"
}
] | 2012-02-08T00:00:00 | [
[
"Cviklinski",
"J.",
""
],
[
"Dantan",
"A.",
""
],
[
"Ortalo",
"J.",
""
],
[
"Pinard",
"M.",
""
]
] |
0705.3572 | Anatoliy Klimyk U. | A. Klimyk and J. Patera | (Anti)symmetric multivariate exponential functions and corresponding
Fourier transforms | 18 pages, no figeres | null | 10.1088/1751-8113/40/34/006 | null | math.CA math-ph math.MP | null | We define and study symmetrized and antisymmetrized multivariate exponential
functions. They are defined as determinants and antideterminants of matrices
whose entries are exponential functions of one variable. These functions are
eigenfunctions of the Laplace operator on corresponding fundamental domains
satisfying certain boundary conditions. To symmetric and antisymmetric
multivariate exponential functions there correspond Fourier transforms. There
are three types of such Fourier transforms: expansions into corresponding
Fourier series, integral Fourier transforms, and multivariate finite Fourier
transforms. Eigenfunctions of the integral Fourier transforms are found.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:44:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Klimyk",
"A.",
""
],
[
"Patera",
"J.",
""
]
] |
0705.3573 | Dubi Kelmer | Lior Bary-Soroker and Dubi Kelmer | On PAC Extensions and Scaled Trace Forms | 10 pages; added results on prime-to-p extensions, removed the
condition on the countability of the fields | null | null | null | math.NT | null | Any non-degenerate quadratic form over a Hilbertian field (e.g., a number
field) is isomorphic to a scaled trace form. In this work we extend this result
to more general fields. In particular, prosolvable and prime-to-p extensions of
a Hilbertian field. The proofs are based on the theory of PAC extensions.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:53:08 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 10:18:16 GMT"
}
] | 2007-08-29T00:00:00 | [
[
"Bary-Soroker",
"Lior",
""
],
[
"Kelmer",
"Dubi",
""
]
] |
0705.3574 | Vladimir Manko i | V.I. Man'ko, G. Marmo, E.C.G. Sudarshan and F. Zaccaria | The geometry of density states, positive maps and tomograms | 52 pages, in: Symmetries in Science XI, Bruno J. Gruber, Giuseppe
Marmo Naotaka Yoshinag (Eds), Kluwer Academic Publishers, Dordrecht 2004,
''The Geometry of Density States, Positive Maps, and Tomograms'' pp. 395-443 | null | null | null | quant-ph | null | The positive and not completely positive maps of density matrices, which are
contractive maps, are discussed as elements of a semigroup. A new kind of
positive map (the purification map), which is nonlinear map, is introduced. The
density matrices are considered as vectors, linear maps among matrices are
represented by superoperators given in the form of higher dimensional matrices.
Probability representation of spin states (spin tomography) is reviewed and
U(N)-tomogram of spin states is presented. Properties of the tomograms as
probability distribution functions are studied. Notion of tomographic purity of
spin states is introduced. Entanglement and separability of density matrices
are expressed in terms of properties of the tomographic joint probability
distributions of random spin projections which depend also on unitary group
parameters. A new positivity criterion for hermitian matrices is formulated. An
entanglement criterion is given in terms of a function depending on unitary
group parameters and semigroup of positive map parameters. The function is
constructed as sum of moduli of U(N)-tomographic symbols of the hermitian
matrix obtained after action on the density matrix of composite system by a
positive but not completely positive map of the subsystem density matrix. Some
two-qubit and two-qutritt states are considered as examples of entangled
states. The connection with the star-product quantisation is discussed. The
structure of the set of density matrices and their relation to unitary group
and Lie algebra of the unitary group are studied. Nonlinear quantum evolution
of state vector obtained by means of applying purification rule of density
matrices evolving via dynamical maps is considered. Some connection of positive
maps and entanglement with random matrices is discussed and used.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:56:15 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Man'ko",
"V. I.",
""
],
[
"Marmo",
"G.",
""
],
[
"Sudarshan",
"E. C. G.",
""
],
[
"Zaccaria",
"F.",
""
]
] |
0705.3575 | Tapobrata Sarkar | Tapobrata Sarkar | On Dimer Models and Closed String Theories | 1 + 25 pages, LaTeX, 11 epsf figures | JHEP 0710:010,2007 | 10.1088/1126-6708/2007/10/010 | null | hep-th | null | We study some aspects of the recently discovered connection between dimer
models and D-brane gauge theories. We argue that dimer models are also
naturally related to closed string theories on non compact orbifolds of $\BC^2$
and $\BC^3$, via their twisted sector R charges, and show that perfect
matchings in dimer models correspond to twisted sector states in the closed
string theory. We also use this formalism to study the combinatorics of some
unstable orbifolds of $\BC^2$.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:07:25 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Sarkar",
"Tapobrata",
""
]
] |
0705.3576 | Bruno Andreotti | J.H. Snoeijer, B. Andreotti, G. Delon and M. Fermigier | Relaxation of a dewetting contact line Part 1: A full-scale hydrodynamic
calculation | 21 pages, 9 figures | J. Fluid Mech. (2007), vol. 579, pp. 63-83 | 10.1017/S0022112007005216 | null | physics.flu-dyn | null | The relaxation of a dewetting contact line is investigated theoretically in
the so-called "Landau-Levich" geometry in which a vertical solid plate is
withdrawn from a bath of partially wetting liquid. The study is performed in
the framework of lubrication theory, in which the hydrodynamics is resolved at
all length scales (from molecular to macroscopic). We investigate the
bifurcation diagram for unperturbed contact lines, which turns out to be more
complex than expected from simplified 'quasi-static' theories based upon an
apparent contact angle. Linear stability analysis reveals that below the
critical capillary number of entrainment, Ca_c, the contact line is linearly
stable at all wavenumbers. Away from the critical point the dispersion relation
has an asymptotic behaviour sigma~|q| and compares well to a quasi-static
approach. Approaching Ca_c, however, a different mechanism takes over and the
dispersion evolves from |q| to the more common q^2. These findings imply that
contact lines can not be treated as universal objects governed by some
effective law for the macroscopic contact angle, but viscous effects have to be
treated explicitly.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:15:26 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Snoeijer",
"J. H.",
""
],
[
"Andreotti",
"B.",
""
],
[
"Delon",
"G.",
""
],
[
"Fermigier",
"M.",
""
]
] |
0705.3577 | Kirill Samokhin | K. V. Samokhin | On the spin susceptibility of noncentrosymmetric superconductors | 12 pages, 3 figures | Phys. Rev. B 76, 094516 (2007) | 10.1103/PhysRevB.76.094516 | null | cond-mat.supr-con | null | We calculate the spin susceptibility of a superconductor without inversion
symmetry, both in the clean and disordered cases. The susceptibility has a
large residual value at zero temperature, which is further enhanced in the
presence of scalar impurities.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:20:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Samokhin",
"K. V.",
""
]
] |
0705.3578 | Nikolai Chuprikov | N. L. Chuprikov | Quantum mechanics as a macrorealistic theory | 16 pages, no figures; this version differs essentially from
0705.3578v3 | null | null | null | quant-ph | null | As contrasted with physicists to idolize Bell's theorem and quantum
nonlocality, we argue that quantum mechanics (QM), in reality, respects the
principles of a macroscopic realism (PMRs). The current QM to tell us that "...
the state of a system can be instantaneously changed by a distant measurement
>..." cannot be treated as a physical theory. Its key statements - that the
EPR-Bell experiments to violate Bell's inequality verify nonlocality, and
nonlocal correlations respect special relativity - are false. Both the EPR-Bell
experiments and theorems to support the "non-signalling principle" are based on
the implicit assumption that all quantum postulates and, in particular, Born's
averaging rule are fully applicable to Cat states. However, this is not the
case. Introducing observables (e.g., correlations) for Cat states violates the
correspondence principle. Pure (macro- and micro-)Cat states must be governed
both by the PMRs and superposition principle. Our (macrorealistic) model of a
one-dimensional completed scattering shows how these principles coexist with
each other, in the case of a one-electron micro-Cat state.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:21:37 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 14:21:59 GMT"
},
{
"version": "v3",
"created": "Wed, 18 Jul 2007 06:25:37 GMT"
},
{
"version": "v4",
"created": "Mon, 10 Sep 2007 13:32:20 GMT"
},
{
"version": "v5",
"created": "Thu, 20 Sep 2007 12:59:42 GMT"
}
] | 2007-09-20T00:00:00 | [
[
"Chuprikov",
"N. L.",
""
]
] |
0705.3579 | Muhammad Sharif | M. Sharif and Umber Sheikh | Cold Plasma Dispersion Relations in the Vicinity of a Schwarzschild
Black Hole Horizon | 27 pages, 11 figures accepted for publication in Gen. Relat. & Gravit | Gen.Rel.Grav.39:1437-1465,2007 | 10.1007/s10714-007-0465-8 | null | gr-qc astro-ph | null | We apply the ADM 3+1 formalism to derive the general relativistic
magnetohydrodynamic equations for cold plasma in spatially flat Schwarzschild
metric. Respective perturbed equations are linearized for non-magnetized and
magnetized plasmas both in non-rotating and rotating backgrounds. These are
then Fourier analyzed and the corresponding dispersion relations are obtained.
These relations are discussed for the existence of waves with positive angular
frequency in the region near the horizon. Our results support the fact that no
information can be extracted from the Schwarzschild black hole. It is concluded
that negative phase velocity propagates in the rotating background whether the
black hole is rotating or non-rotating.
| [
{
"version": "v1",
"created": "Sat, 19 May 2007 07:53:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sharif",
"M.",
""
],
[
"Sheikh",
"Umber",
""
]
] |
0705.3580 | Asmita Mukherjee | H. Dahiya, A. Mukherjee, S. Ray | Parton Distributions in Impact Parameter Space | 13 pages, 6 figures | Phys.Rev.D76:034010,2007 | 10.1103/PhysRevD.76.034010 | null | hep-ph | null | Fourier transform of the generalized parton distributions (GPDs) at zero
skewness with respect to the transverse momentum transfer gives the
distribution of partons in the impact parameter space. We investigate the GPDs
as well as the impact parameter dependent parton distributions (ipdpdfs) by
expressing them in terms of overlaps of light front wave functions (LFWFs) and
present a comparative study using three different model LFWFs.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:25:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dahiya",
"H.",
""
],
[
"Mukherjee",
"A.",
""
],
[
"Ray",
"S.",
""
]
] |
0705.3581 | Martin Horvat | Martin Horvat and Tomaz Prosen | The bends on a quantum waveguide and cross-products of Bessel functions | 34 pages, 21 figures | null | 10.1088/1751-8113/40/24/006 | null | quant-ph math-ph math.MP | null | A detailed analysis of the wave-mode structure in a bend and its
incorporation into a stable algorithm for calculation of the scattering matrix
of the bend is presented. The calculations are based on the modal approach. The
stability and precision of the algorithm is numerically and analytically
analysed. The algorithm enables precise numerical calculations of scattering
across the bend. The reflection is a purely quantum phenomenon and is discussed
in more detail over a larger energy interval. The behaviour of the reflection
is explained partially by a one-dimensional scattering model and heuristic
calculations of the scattering matrix for narrow bends. In the same spirit we
explain the numerical results for the Wigner-Smith delay time in the bend.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 12:07:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Horvat",
"Martin",
""
],
[
"Prosen",
"Tomaz",
""
]
] |
0705.3582 | Ronald Zinke | Ronald Zinke, Joerg Schulenburg, Johannes Richter | Ground-state long-range order in quasi-one-dimensional Heisenberg
quantum antiferromagnets: High-order coupled-cluster calculations | 6 pages, 7 figures | Eur. Phys. J. B. 64, 147-152 (2008) | 10.1140/epjb/e2008-00055-7 | null | cond-mat.str-el | null | We investigate the ground-state magnetic long-range order of
quasi-one-dimensional quantum Heisenberg antiferromagnets for spin quantum
numbers s=1/2 and s=1. We use the coupled cluster method to calculate the
sublattice magnetization in dependence on the inter-chain coupling. We find
that for the unfrustrated spin-1/2 system an infinitesimal inter-chain coupling
is sufficient to stabilize magnetic long-range order, which is in agreement
with results obtained by some other methods. For s=1 we find that a finite
inter-chain coupling of about 10% of the in-chain coupling is necessary to
stabilize magnetic long-range order. Furthermore, we consider a quasi
one-dimensional spin-1/2 system, where a frustrating next-nearest neighbor
in-chain coupling is included. We find that for stronger frustration also a
finite inter-chain coupling is necessary to have magnetic long-range order in
the ground state, where the strength of the inter-chain coupling necessary to
establish magnetic long-range order is related to the size of the spin gap of
the isolated chain.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:27:54 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Mar 2008 09:16:42 GMT"
}
] | 2008-03-05T00:00:00 | [
[
"Zinke",
"Ronald",
""
],
[
"Schulenburg",
"Joerg",
""
],
[
"Richter",
"Johannes",
""
]
] |
0705.3583 | Bruno Andreotti | G. Delon, M. Fermigier, J.H. Snoeijer and B. Andreotti | Relaxation of a dewetting contact line Part 2: Experiments | 20 pages, 11 figures Part 1 is stored as Arxiv 0705.3576 | null | 10.1017/S0022112008000979 | null | physics.flu-dyn | null | The dynamics of receding contact lines is investigated experimentally through
controlled perturbations of a meniscus in a dip coating experiment. We first
characterize stationary menisci and their breakdown at the coating transition.
It is then shown that the dynamics of both liquid deposition and
long-wavelength perturbations adiabatically follow these stationary states.
This provides a first experimental access to the entire bifurcation diagram of
dynamical wetting, confirming the hydrodynamic theory developed in Part 1. In
contrast to quasi-static theories based on a dynamic contact angle, we
demonstrate that the transition strongly depends on the large scale flow
geometry. We then establish the dispersion relation for large wavenumbers, for
which we find that sigma is linear in q. The speed dependence of sigma is well
described by hydrodynamic theory, in particular the absence of diverging
time-scales at the critical point. Finally, we highlight some open problems
related to contact angle hysteresis that lead beyond the current description.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:32:20 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Delon",
"G.",
""
],
[
"Fermigier",
"M.",
""
],
[
"Snoeijer",
"J. H.",
""
],
[
"Andreotti",
"B.",
""
]
] |
0705.3584 | Stephen Clark | S.R. Clark, A. Klein, M. Bruderer and D. Jaksch | Graph state generation with noisy mirror-inverting spin chains | 27 pages, 13 figures. To appear in New Journal of Physics | New J. Phys. 9, 202 (2007) | 10.1088/1367-2630/9/6/202 | null | quant-ph | null | We investigate the influence of noise on a graph state generation scheme
which exploits a mirror inverting spin chain. Within this scheme the spin chain
is used repeatedly as an entanglement bus (EB) to create multi-partite
entanglement. The noise model we consider comprises of each spin of this EB
being exposed to independent local noise which degrades the capabilities of the
EB. Here we concentrate on quantifying its performance as a single-qubit
channel and as a mediator of a two-qubit entangling gate, since these are basic
operations necessary for graph state generation using the EB. In particular,
for the single-qubit case we numerically calculate the average channel fidelity
and whether the channel becomes entanglement breaking, i.e., expunges any
entanglement the transferred qubit may have with other external qubits. We find
that neither local decay nor dephasing noise cause entanglement breaking. This
is in contrast to local thermal and depolarizing noise where we determine a
critical length and critical noise coupling, respectively, at which
entanglement breaking occurs. The critical noise coupling for local
depolarizing noise is found to exhibit a power-law dependence on the chain
length. For two qubits we similarly compute the average gate fidelity and
whether the ability for this gate to create entanglement is maintained. The
concatenation of these noisy gates for the construction of a five qubit linear
cluster state and a Greenberger-Horne-Zeilinger state indicates that the level
of noise that can be tolerated for graph state generation is tightly
constrained.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 13:41:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Clark",
"S. R.",
""
],
[
"Klein",
"A.",
""
],
[
"Bruderer",
"M.",
""
],
[
"Jaksch",
"D.",
""
]
] |
0705.3585 | Alexander Nikitenko | M. V. Acosta (CERN), A. Nikitenko (Imperiall College, London. On leave
from ITET, Moscow) | Monte Carlo study of gg->H+jets contribution to Vector Boson Fusion
Higgs production at the LHC | null | null | null | null | hep-ph | null | The contribution of gg->H+jets production process to the vector boson fusion
production of the Higgs boson, VV->H, at LHC was evaluated with the ALPGEN
generator and the PYTHIA shower Monte Carlo including a jet-parton matching
procedure. After the experimental like event selections applied at PYTHIA
particle level, the contribution was found to be 4-5 % for a Higgs boson mass
of 120 GeV.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:09:53 GMT"
}
] | 2007-05-25T00:00:00 | [
[
"Acosta",
"M. V.",
"",
"CERN"
],
[
"Nikitenko",
"A.",
"",
"Imperiall College, London. On leave\n from ITET, Moscow"
]
] |
0705.3586 | Perivolaropoulos Leandros | S. Capozziello, S. Nesseris and L. Perivolaropoulos | Reconstruction of the Scalar-Tensor Lagrangian from a LCDM Background
and Noether Symmetry | Added comments, discussion, references. 15 revtex pages, 5 fugures | JCAP 0712:009,2007 | 10.1088/1475-7516/2007/12/009 | null | astro-ph gr-qc hep-ph hep-th math-ph math.MP | null | We consider scalar-tensor theories and reconstruct their potential U(\Phi)
and coupling F(\Phi) by demanding a background LCDM cosmology. In particular we
impose a background cosmic history H(z) provided by the usual flat LCDM
parameterization through the radiation (w_{eff}=1/3), matter (w_{eff}=0) and
deSitter (w_{eff}=-1) eras. The cosmological dynamical system which is
constrained to obey the LCDM cosmic history presents five critical points in
each era, one of which corresponding to the standard General Relativity (GR).
In the cases that differ from GR, the reconstructed coupling and potential are
of the form F(\Phi)\sim \Phi^2 and U(\Phi)\sim F(\Phi)^m where m is a constant.
This class of scalar tensor theories is also theoretically motivated by a
completely independent approach: imposing maximal Noether symmetry on the
scalar-tensor Lagrangian. This approach provides independently: i) the form of
the coupling and the potential as F(\Phi)\sim \Phi^2 and U(\Phi)\sim F(\Phi)^m,
ii) a conserved charge related to the potential and the coupling and iii)
allows the derivation of exact solutions by first integrals of motion.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 20:00:01 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 20:03:44 GMT"
},
{
"version": "v3",
"created": "Fri, 25 May 2007 20:19:45 GMT"
},
{
"version": "v4",
"created": "Fri, 27 Jul 2007 10:08:07 GMT"
}
] | 2011-05-19T00:00:00 | [
[
"Capozziello",
"S.",
""
],
[
"Nesseris",
"S.",
""
],
[
"Perivolaropoulos",
"L.",
""
]
] |
0705.3587 | Shahram Jalalzadeh | P. Pedram, S. Jalalzadeh, and S. S. Gousheh | Schr\"odinger-Wheeler-DeWitt equation in chaplygin gas FRW cosmological
model | 11 pages, 1 figure, to appear in IJTP | Int.J.Theor.Phys.46:3201-3208,2007 | 10.1007/s10773-007-9436-9 | null | gr-qc | null | We present a chaplygin gas Friedmann-Robertson-Walker quantum cosmological
model. In this work the Schutz's variational formalism is applied with
positive, negative, and zero constant spatial curvature. In this approach the
notion of time can be recovered. These give rise to
Schr\"odinger-Wheeler-DeWitt equation for the scale factor. We use the
eigenfunctions in order to construct wave packets for each case. We study the
time dependent behavior of the expectation value of the scale factor, using the
many-worlds interpretations of quantum mechanics.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:01:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pedram",
"P.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Gousheh",
"S. S.",
""
]
] |
0705.3588 | Kouji Yano | Kouji Yano | Convergence of excursion point processes and its applications to
functional limit theorems of Markov processes on a half-line | Published in at http://dx.doi.org/10.3150/08-BEJ132 the Bernoulli
(http://isi.cbs.nl/bernoulli/) by the International Statistical
Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm) | Bernoulli 2008, Vol. 14, No. 4, 963-987 | 10.3150/08-BEJ132 | IMS-BEJ-BEJ132 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Invariance principles are obtained for a Markov process on a half-line with
continuous paths on the interior. The domains of attraction of the two
different types of self-similar processes are investigated. Our approach is to
establish convergence of excursion point processes, which is based on It\^{o}'s
excursion theory and a recent result on convergence of excursion measures by
Fitzsimmons and the present author.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:04:42 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 05:58:16 GMT"
},
{
"version": "v3",
"created": "Mon, 25 Feb 2008 14:04:46 GMT"
},
{
"version": "v4",
"created": "Fri, 14 Nov 2008 11:17:11 GMT"
}
] | 2008-11-14T00:00:00 | [
[
"Yano",
"Kouji",
""
]
] |
0705.3589 | Pavel Fileviez Perez | Pavel Fileviez Perez | Supersymmetric Adjoint SU(5) | 5 pages, section III expanded, reference added, conclusions unchanged | Phys.Rev.D76:071701,2007 | 10.1103/PhysRevD.76.071701 | null | hep-ph hep-th | null | Recently we have proposed a renormalizable grand unified theory, based on the
SU(5) gauge symmetry, where the neutrino masses are generated through the type
I and type III seesaw mechanisms. In this letter we study the supersymmetric
version of this theory. As in the non-susy version it is possible to generate
all fermion masses with the minimal number of Higgses, the theory predicts one
massless neutrino and the leptogenesis mechanism can be realized. All
contributions to the decay of the proton and the properties of neutralinos are
discussed. This theory can be considered as the simplest renormalizable
supersymmetric grand unified theory based on the SU(5) gauge symmetry since it
has the minimal number of superfields and free parameters.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:07:03 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jul 2007 16:06:11 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Perez",
"Pavel Fileviez",
""
]
] |
0705.3590 | Luca Giuzzi | A. Aguglia, L. Giuzzi | Orthogonal arrays from Hermitian varieties | Corrected a typo on page 5. 14 Pages | Innovations in Incidence Geometry 5: 129-144 (2007) | null | null | math.CO math.ST stat.TH | null | An orthogonal array OA(q^{2n-1},q^{2n-2}, q,2) is constructed from the action
of a subset of PGL(n+1,q^2) on some non--degenerate Hermitian varieties in
PG(n,q^2). It is also shown that the rows of this orthogonal array correspond
to some blocks of an affine design, which for q> 2 is a non--classical model of
the affine space AG(2n-1,q).
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:20:57 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 21:08:32 GMT"
},
{
"version": "v3",
"created": "Tue, 3 Jul 2007 16:05:06 GMT"
}
] | 2009-07-18T00:00:00 | [
[
"Aguglia",
"A.",
""
],
[
"Giuzzi",
"L.",
""
]
] |
0705.3591 | David Dudal | M.A.L. Capri, D. Dudal, V.E.R. Lemes, R.F. Sobreiro, S.P. Sorella, R.
Thibes, H. Verschelde | The Gribov-Zwanziger action in the presence of the gauge invariant,
nonlocal mass operator $Tr \int d^4x F_{\mu\nu} (D^2)^{-1} F_{\mu\nu}$ in the
Landau gauge | 30 pages | Eur.Phys.J.C52:459-476,2007 | 10.1140/epjc/s10052-007-0379-3 | null | hep-th | null | We prove that the nonlocal gauge invariant mass dimension two operator
$F_{\mu\nu} (D^2)^{-1} F_{\mu\nu}$ can be consistently added to the
Gribov-Zwanziger action, which implements the restriction of the path
integral's domain of integration to the first Gribov region when the Landau
gauge is considered. We identify a local polynomial action and prove the
renormalizability to all orders of perturbation theory by employing the
algebraic renormalization formalism. Furthermore, we also pay attention to the
breaking of the BRST invariance, and to the consequences that this has for the
Slavnov-Taylor identity.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:19:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Capri",
"M. A. L.",
""
],
[
"Dudal",
"D.",
""
],
[
"Lemes",
"V. E. R.",
""
],
[
"Sobreiro",
"R. F.",
""
],
[
"Sorella",
"S. P.",
""
],
[
"Thibes",
"R.",
""
],
[
"Verschelde",
"H.",
""
]
] |
0705.3592 | Vladimir Matveev | Robert L. Bryant, Gianni Manno, Vladimir S. Matveev | A solution of a problem of Sophus Lie: Normal forms of 2-dim metrics
admitting two projective vector fields | This is an extended version of the paper that will appear in Math.
Annalen. Some typos were corrected, references were updated, title was
changed (as in the journal version). 31 pages | Math. Ann. 340(2008), no. 2, 437-463 | 10.1007/s00208-007-0158-3 | null | math.DG math.AP | null | We give a complete list of normal forms for the 2-dimensional metrics that
admit a transitive Lie pseudogroup of geodesic-preserving transformations and
we show that these normal forms are mutually non-isometric. This solves a
problem posed by Sophus Lie.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 16:24:27 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 22:18:13 GMT"
}
] | 2011-08-08T00:00:00 | [
[
"Bryant",
"Robert L.",
""
],
[
"Manno",
"Gianni",
""
],
[
"Matveev",
"Vladimir S.",
""
]
] |
0705.3593 | Wolfgang Jacquet | W. Jacquet, P. de Groen | MI image registration using prior knowledge | 16 pages | null | null | null | cs.CV | null | Subtraction of aligned images is a means to assess changes in a wide variety
of clinical applications. In this paper we explore the information theoretical
origin of Mutual Information (MI), which is based on Shannon's entropy.However,
the interpretation of standard MI registration as a communication channel
suggests that MI is too restrictive a criterion. In this paper the concept of
Mutual Information (MI) is extended to (Normalized) Focussed Mutual Information
(FMI) to incorporate prior knowledge to overcome some shortcomings of MI. We
use this to develop new methodologies to successfully address specific
registration problems, the follow-up of dental restorations, cephalometry, and
the monitoring of implants.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:41:11 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 12:14:51 GMT"
}
] | 2007-06-19T00:00:00 | [
[
"Jacquet",
"W.",
""
],
[
"de Groen",
"P.",
""
]
] |
0705.3594 | David Russell | D. M. Russell (1), T. J. Maccarone (1), E. G. Koerding (1), J. Homan
(2) ((1) University of Southampton, (2) MIT) | Parallel tracks in infrared versus X-ray emission in black hole X-ray
transient outbursts: a hysteresis effect? | MNRAS accepted. 9 pages, 4 figures | Mon.Not.Roy.Astron.Soc.379:1401-1408,2007 | 10.1111/j.1365-2966.2007.11996.x | null | astro-ph | null | We report the discovery of a new hysteresis effect in black hole X-ray binary
state transitions, that of the near-infrared (NIR) flux (which most likely
originates in the jets) versus X-ray flux. We find, looking at existing data
sets, that the infrared emission of black hole X-ray transients appears to be
weaker in the low/hard state rise of an outburst than the low/hard state
decline of an outburst at a given X-ray luminosity. We discuss how this effect
may be caused by a shift in the radiative efficiency of the inflowing or
outflowing matter, or variations in the disc viscosity or the spectrum/power of
the jet. In addition we show that there is a correlation (in slope but not in
normalisation) between infrared and X-ray luminosities on the rise and decline,
for all three low-mass black hole X-ray binaries with well-sampled infrared and
X-ray coverage: L_NIR propto L_x^(0.5-0.7). In the high/soft state this slope
is much shallower; L_NIR propto Lx^(0.1-0.2), and we find that the NIR emission
in this state is most likely dominated by the viscously heated (as opposed to
X-ray heated) accretion disc in all three sources.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:44:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Russell",
"D. M.",
"",
"University of Southampton"
],
[
"Maccarone",
"T. J.",
"",
"University of Southampton"
],
[
"Koerding",
"E. G.",
"",
"University of Southampton"
],
[
"Homan",
"J.",
"",
"MIT"
]
] |
0705.3595 | Momme Winkelnkemper | M. Winkelnkemper, R. Seguin, S. Rodt, A. Schliwa, L. Reissmann, A.
Strittmatter, A. Hoffmann, D. Bimberg | Polarized emission lines from A- and B-type excitonic complexes in
single InGaN/GaN quantum dots | accepted at Journal of Applied Physics | J. Appl. Phys. 101, 113708 (2007) | 10.1063/1.2743893 | null | cond-mat.mtrl-sci | null | Cathodoluminescence measurements on single InGaN/GaN quantum dots (QDs) are
reported. Complex spectra with up to five emission lines per QD are observed.
The lines are polarized along the orthogonal crystal directions [1 1 -2 0] and
[-1 1 0 0]. Realistic eight-band k.p electronic structure calculations show
that the polarization of the lines can be explained by excitonic recombinations
involving hole states which are either formed by the A or the B valence band.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:47:02 GMT"
}
] | 2007-06-14T00:00:00 | [
[
"Winkelnkemper",
"M.",
""
],
[
"Seguin",
"R.",
""
],
[
"Rodt",
"S.",
""
],
[
"Schliwa",
"A.",
""
],
[
"Reissmann",
"L.",
""
],
[
"Strittmatter",
"A.",
""
],
[
"Hoffmann",
"A.",
""
],
[
"Bimberg",
"D.",
""
]
] |
0705.3596 | Angel Ruiz | A. Ruiz, F.J. Carrera, F. Panessa (IFCA (CSIC - Uc)) | An XMM-Newton study of Hyper-Luminous Infrared Galaxies | 14 pages, 6 figures, accepted for publication in Astronomy and
Astrophysics | Astron.Astrophys. 471 (2007) 775-786 | 10.1051/0004-6361:20066708 | null | astro-ph | null | Hyper-Luminous Infrared Galaxies (HLIRGs) are the most luminous persistent
objects in the Universe. They exhibit extremely high star formation rates, and
most of them seem to harbour an AGN. They are unique laboratories to
investigate utmost star formation, and its connection to super-massive black
hole growth. X-ray studies of HLIRGs have the potential to unravel the AGN
contribution to the bolometric output from these bright objects.
We have selected a sample of 14 HLIRGs observed by XMM-Newton (type 1, type 2
AGN and starburst), 5 of which are candidates to be Compton-thick objects. This
is the first time that a systematic study of this type of objects is carried
out in the X-ray spectral band. Their X-ray spectral properties have been
correlated with their IR luminosities, estimated by IRAS, ISO and sub-mm data.
The X-ray spectra of HLIRGs present heterogeneous properties. All our X-ray
detected HLIRGs (10) have AGN-dominated X-ray spectra. The hard X-ray
luminosity of 8 of them is consistent with a pure AGN contribution, while in
the remaining 2 sources both an AGN and a starburst seem to contribute to the
overall emission. We found soft excess emission in 5 sources. In one of them it
is consistent with a pure starburst origin, while in the other 4 sources it is
consistent with an AGN origin. The observed X-ray emission is systematically
below the one expected for a standard local QSO of the same IR luminosity,
suggesting the possible presence of absorption in type 2 objects and/or a
departure from a standard spectral energy distribution of QSO. The
X-ray-to-IR-luminosity ratio is constant with redshift, indicating similar
evolutions for the AGN and starburst component, and that their respective power
sources could be physically related.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:47:25 GMT"
}
] | 2007-08-29T00:00:00 | [
[
"Ruiz",
"A.",
"",
"IFCA"
],
[
"Carrera",
"F. J.",
"",
"IFCA"
],
[
"Panessa",
"F.",
"",
"IFCA"
]
] |
0705.3597 | Dennis Shasha | Dennis Shasha (Courant Institute, New York University) and Martyn Amos
(Computing and Mathematics, Manchester Metropolitan University) | DNA Hash Pooling and its Applications | 14 pages, 3 figures. To appear in the International Journal of
Nanotechnology and Molecular Computation. Improved background, analysis and
references | null | null | null | q-bio.BM q-bio.PE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we describe a new technique for the comparison of populations
of DNA strands. Comparison is vital to the study of ecological systems, at both
the micro and macro scales. Existing methods make use of DNA sequencing and
cloning, which can prove costly and time consuming, even with current
sequencing techniques. Our overall objective is to address questions such as:
(i) (Genome detection) Is a known genome sequence present, at least in part, in
an environmental sample? (ii) (Sequence query) Is a specific fragment sequence
present in a sample? (iii) (Similarity discovery) How similar in terms of
sequence content are two unsequenced samples? We propose a method involving
multiple filtering criteria that result in "pools" of DNA of high or very high
purity. Because our method is similar in spirit to hashing in computer science,
we call it DNA hash pooling. To illustrate this method, we describe protocols
using pairs of restriction enzymes. The in silico empirical results we present
reflect a sensitivity to experimental error. Our method will normally be
performed as a filtering step prior to sequencing in order to reduce the amount
of sequencing required (generally by a factor of 10 or more). Even as
sequencing becomes cheaper, an order of magnitude remains important.
| [
{
"version": "v1",
"created": "Thu, 24 May 2007 14:53:19 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Jul 2008 13:08:58 GMT"
}
] | 2008-07-02T00:00:00 | [
[
"Shasha",
"Dennis",
"",
"Courant Institute, New York University"
],
[
"Amos",
"Martyn",
"",
"Computing and Mathematics, Manchester Metropolitan University"
]
] |
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