id stringlengths 9 16 | title stringlengths 1 382 | abstract stringlengths 6 6.09k | categories stringlengths 5 125 |
|---|---|---|---|
0704.0101 | The birth of string theory | In this contribution we go through the developments that in the years 1968 to
1974 led from the Veneziano model to the bosonic string.
| hep-th |
0704.0102 | Duality and Tameness | We prove a duality theorem for certain graded algebras and show by various
examples different kinds of failure of tameness of local cohomology.
| math.AC math.AG |
0704.0103 | Generalized regularly discontinuous solutions of the Einstein equations | The physical consistency of the match of piecewise-$C^0$ metrics is
discussed. The mathematical theory of gravitational discontinuity hypersurfaces
is generalized to cover the match of regularly discontinuous metrics. The
mean-value differential geometry framework on a hypersurface is introduced, and
corresponding co... | gr-qc |
0704.0104 | A geometric realization of sl(6,C) | Given an orientable weakly self-dual manifold X of rank two, we build a
geometric realization of the Lie algebra sl(6,C) as a naturally defined algebra
L of endomorphisms of the space of differential forms of X. We provide an
explicit description of Serre generators in terms of natural generators of L.
This construct... | math.DG math.RT |
0704.0105 | Rigid subsets of symplectic manifolds | We show that there is an hierarchy of intersection rigidity properties of
sets in a closed symplectic manifold: some sets cannot be displaced by
symplectomorphisms from more sets than the others. We also find new examples of
rigidity of intersections involving, in particular, specific fibers of moment
maps of Hamilto... | math.SG |
0704.0106 | Multiple Parton Scattering in Nuclei: Quark-quark Scattering | Modifications to quark and antiquark fragmentation functions due to
quark-quark (antiquark) double scattering in nuclear medium are studied
systematically up to order \cal{O}(\alpha_{s}^2)$ in deeply inelastic
scattering (DIS) off nuclear targets. At the order $\cal{O}(\alpha_s^2)$,
twist-four contributions from quar... | hep-ph nucl-th |
0704.0107 | Experimental modeling of physical laws | A physical law is represented by the probability distribution of a measured
variable. The probability density is described by measured data using an
estimator whose kernel is the instrument scattering function. The experimental
information and data redundancy are defined in terms of information entropy.
The model cos... | physics.data-an |
0704.0108 | Reducing SAT to 2-SAT | Description of a polynomial time reduction of SAT to 2-SAT of polynomial
size.
| cs.CC |
0704.0109 | Half-metallic silicon nanowires | From first-principles calculations, we predict that transition metal (TM)
atom doped silicon nanowires have a half-metallic ground state. They are
insulators for one spin-direction, but show metallic properties for the
opposite spin direction. At high coverage of TM atoms, ferromagnetic silicon
nanowires become metal... | cond-mat.mtrl-sci cond-mat.other |
0704.0110 | On Equivariant Embedding of Hilbert C^* modules | We prove that an arbitrary (not necessarily countably generated) Hilbert
$G$-$\cla$ module on a G-C^* algebra $\cla$ admits an equivariant embedding
into a trivial $G-\cla$ module, provided G is a compact Lie group and its
action on $\cla$ is ergodic.
| math.OA |
0704.0111 | Invariance and the twisted Chern character : a case study | We give details of the proof of the remark made in \cite{G2} that the Chern
characters of the canonical generators on the K homology of the quantum group
$SU_q(2)$ are not invariant under the natural $SU_q(2)$ coaction. Furthermore,
the conjecture made in \cite{G2} about the nontriviality of the twisted Chern
charact... | math.QA math.KT |
0704.0112 | Placeholder Substructures III: A Bit-String-Driven ''Recipe Theory'' for
Infinite-Dimensional Zero-Divisor Spaces | Zero-divisors (ZDs) derived by Cayley-Dickson Process (CDP) from
N-dimensional hypercomplex numbers (N a power of 2, at least 4) can represent
singularities and, as N approaches infinite, fractals -- and thereby,scale-free
networks. Any integer greater than 8 and not a power of 2 generates a
meta-fractal or "Sky" whe... | math.RA |
0704.0113 | Langmuir blodgett assembly of densely aligned single walled carbon
nanotubes from bulk materials | Single walled carbon nanotubes exhibit advanced electrical and surface
properties useful for high performance nanoelectronics. Important to future
manufacturing of nanotube circuits is large scale assembly of SWNTs into
aligned forms. Despite progress in assembly and oriented synthesis, pristine
SWNTs in aligned and ... | cond-mat.mtrl-sci |
0704.0114 | Quantum Phase Transition in the Four-Spin Exchange Antiferromagnet | We study the S=1/2 Heisenberg antiferromagnet on a square lattice with
nearest-neighbor and plaquette four-spin exchanges (introduced by A.W. Sandvik,
Phys. Rev. Lett. {\bf 98}, 227202 (2007).)
This model undergoes a quantum phase transition from a spontaneously
dimerized phase to N\'eel order at a critical couplin... | cond-mat.str-el |
0704.0115 | Smooth maps with singularities of bounded K-codimensions | We will prove the relative homotopy principle for smooth maps with
singularities of a given {\cal K}-invariant class with a mild condition. We
next study a filtration of the group of homotopy self-equivalences of a given
manifold P by considering singularities of non-negative {\cal K}-codimensions.
| math.GT |
0704.0116 | Stringy Jacobi fields in Morse theory | We consider the variation of the surface spanned by closed strings in a
spacetime manifold. Using the Nambu-Goto string action, we induce the geodesic
surface equation, the geodesic surface deviation equation which yields a Jacobi
field, and we define the index form of a geodesic surface as in the case of
point parti... | math-ph hep-th math.MP |
0704.0117 | Lower ground state due to counter-rotating wave interaction in trapped
ion system | We consider a single ion confined in a trap under radiation of two traveling
waves of lasers. In the strong-excitation regime and without the restriction of
Lamb-Dicke limit, the Hamiltonian of the system is similar to a driving
Jaynes-Cummings model without rotating wave approximation (RWA). The approach
we develope... | quant-ph |
0704.0118 | Strained single-crystal Al2O3 grown layer-by-layer on Nb (110) thin
films | We report on the layer-by-layer growth of single-crystal Al2O3 thin-films on
Nb (110). Single-crystal Nb films are first prepared on A-plane sapphire,
followed by the evaporation of Al in an O2 background. The first stages of
Al2O3 growth are layer-by-layer with hexagonal symmetry. Electron and x-ray
diffraction meas... | cond-mat.supr-con cond-mat.mtrl-sci |
0704.0119 | Quasi-quartet crystal electric field ground state in a tetragonal
CeAg$_2$Ge$_2$ single crystal | We have successfully grown the single crystals of CeAg$_2$Ge$_2$, for the
first time, by flux method and studied the anisotropic physical properties by
measuring the electrical resistivity, magnetic susceptibility and specific
heat. We found that CeAg$_2$Ge$_2$ undergoes an antiferromagnetic transition at
$T_{\rm N}$... | cond-mat.str-el |
0704.0120 | Strong Phase and $D^0-D^0bar$ mixing at BES-III | Most recently, both BaBar and Belle experiments found evidences of neutral
$D$ mixing. In this paper, we discuss the constraints on the strong phase
difference in $D^0 \to K\pi$ decay from the measurements of the mixing
parameters, $y^\prime$, $y_{CP}$ and $x$ at the $B$ factories. The sensitivity
of the measurement ... | hep-ex hep-ph |
0704.0121 | Meta-Stable Brane Configuration of Product Gauge Groups | Starting from the N=1 SU(N_c) x SU(N_c') gauge theory with fundamental and
bifundamental flavors, we apply the Seiberg dual to the first gauge group and
obtain the N=1 dual gauge theory with dual matters including the gauge
singlets. By analyzing the F-term equations of the superpotential, we describe
the intersectin... | hep-th |
0704.0122 | Spinor dipolar Bose-Einstein condensates; Classical spin approach | Magnetic dipole-dipole interaction dominated Bose-Einstein condensates are
discussed under spinful situations. We treat the spin degrees of freedom as a
classical spin vector, approaching from large spin limit to obtain an effective
minimal Hamiltonian; a version extended from a non-linear sigma model. By
solving the... | cond-mat.other |
0704.0123 | Nonlinear Dynamics of the Phonon Stimulated Emission in Microwave
Solid-State Resonator of the Nonautonomous Phaser Generator | The microwave phonon stimulated emission (SE) has been experimentally and
numerically investigated in a nonautonomous microwave acoustic quantum
generator, called also microwave phonon laser or phaser (see previous works
arXiv:cond-mat/0303188 ; arXiv:cond-mat/0402640 ; arXiv:nlin.CG/0703050)
Phenomena of branching a... | nlin.CD cond-mat.other physics.optics |
0704.0124 | Proper J-holomorphic discs in Stein domains of dimension 2 | We prove the existence of global Bishop discs in a strictly pseudoconvex
Stein domain in an almost complex manifold of complex dimension 2.
| math.CV |
0704.0125 | Anisotropic thermo-elasticity in 2D -- Part I: A unified approach | In this note we develop tools and techniques for the treatment of anisotropic
thermo-elasticity in two space dimensions. We use a diagonalisation technique
to obtain properties of the characteristic roots of the full symbol of the
system in order to prove $L^p$--$L^q$ decay rates for its solutions.
| math.AP |
0704.0126 | I-V characteristics of the vortex state in MgB2 thin films | The current-voltage (I-V) characteristics of various MgB2 films have been
studied at different magnetic fields parallel to c-axis. At fields \mu0H
between 0 and 5T, vortex liquid-glass transitions were found in the I-V
isotherms. Consistently, the I-V curves measured at different temperatures show
a scaling behavior ... | cond-mat.supr-con |
0704.0127 | Magnetic Fingerprints of sub-100 nm Fe Nanodots | Sub-100 nm nanomagnets not only are technologically important, but also
exhibit complex magnetization reversal behaviors as their dimensions are
comparable to typical magnetic domain wall widths. Here we capture magnetic
"fingerprints" of 1 billion Fe nanodots as they undergo a single domain to
vortex state transitio... | cond-mat.mtrl-sci |
0704.0128 | An online repository of Swift/XRT light curves of GRBs | Context. Swift data are revolutionising our understanding of Gamma Ray
Bursts. Since bursts fade rapidly, it is desirable to create and disseminate
accurate light curves rapidly.
Aims. To provide the community with an online repository of X-ray light
curves obtained with Swift. The light curves should be of the qua... | astro-ph |
0704.0129 | On the total disconnectedness of the quotient Aubry set | In this paper we show that the quotient Aubry set associated to certain
Lagrangians is totally disconnected (i.e., every connected component consists
of a single point). Moreover, we discuss the relation between this problem and
a Morse-Sard type property for (difference of) critical subsolutions of
Hamilton-Jacobi e... | math.DS math-ph math.AP math.MP |
0704.0130 | New simple modular Lie superalgebras as generalized prolongs | Over algebraically closed fields of characteristic p>2, prolongations of the
simple finite dimensional Lie algebras and Lie superalgebras with Cartan matrix
are studied for certain simplest gradings of these algebras. Several new simple
Lie superalgebras are discovered, serial and exceptional, including superBrown
an... | math.RT |
0704.0131 | Vacuum Structure and Potential | Based on overall experimental observations, especially the pair processes, I
developed a model structure of the vacuum along with a basic-particle formation
scheme begun in 2000 (with collaborator P-I Johansson). The model consists in
that the vacuum is, briefly, filled of neutral but polarizable vacuuons,
consisting... | physics.gen-ph |
0704.0132 | Counterflow of electrons in two isolated quantum point contacts | We study the interaction between two adjacent but electrically isolated
quantum point contacts (QPCs). At high enough source-drain bias on one QPC, the
drive QPC, we detect a finite electric current in the second, unbiased,
detector QPC. The current generated at the detector QPC always flows in the
opposite direction... | cond-mat.mes-hall |
0704.0133 | PAH emission and star formation in the host of the z~2.56 Cloverleaf QSO | We report the first detection of the 6.2micron and 7.7micron infrared `PAH'
emission features in the spectrum of a high redshift QSO, from the Spitzer-IRS
spectrum of the Cloverleaf lensed QSO (H1413+117, z~2.56). The ratio of PAH
features and rest frame far-infrared emission is the same as in lower
luminosity star f... | astro-ph |
0704.0134 | Causal dissipative hydrodynamics for QGP fluid in 2+1 dimensions | In 2nd order causal dissipative theory, space-time evolution of QGP fluid is
studied in 2+1 dimensions. Relaxation equations for shear stress tensors are
solved simultaneously with the energy-momentum conservation equations.
Comparison of evolution of ideal and viscous QGP fluid, initialized under the
same conditions... | nucl-th |
0704.0135 | A Single Trapped Ion as a Time-Dependent Harmonic Oscillator | We show how a single trapped ion may be used to test a variety of important
physical models realized as time-dependent harmonic oscillators. The ion itself
functions as its own motional detector through laser-induced electronic
transitions. Alsing et al. [Phys. Rev. Lett. 94, 220401 (2005)] proposed that
an exponenti... | quant-ph |
0704.0136 | Compounding Fields and Their Quantum Equations in the Trigintaduonion
Space | The 32-dimensional compounding fields and their quantum interplays in the
trigintaduonion space can be presented by analogy with octonion and sedenion
electromagnetic, gravitational, strong and weak interactions. In the
trigintaduonion fields which are associated with the electromagnetic,
gravitational, strong and we... | physics.gen-ph |
0704.0137 | Topological defects, geometric phases, and the angular momentum of light | Recent reports on the intriguing features of vector vortex bearing beams are
analyzed using geometric phases in optics. It is argued that the spin
redirection phase induced circular birefringence is the origin of topological
phase singularities arising in the inhomogeneous polarization patterns. A
unified picture of ... | quant-ph |
0704.0138 | Circular and non-circular nearly horizon-skimming orbits in Kerr
spacetimes | We have performed a detailed analysis of orbital motion in the vicinity of a
nearly extremal Kerr black hole. For very rapidly rotating black holes (spin
a=J/M>0.9524M) we have found a class of very strong field eccentric orbits
whose angular momentum L_z increases with the orbit's inclination with respect
to the equ... | gr-qc astro-ph |
0704.0139 | The Blue Straggler Population of the Globular Cluster M5 | By combining high-resolution HST and wide-field ground based observations, in
ultraviolet and optical bands, we study the Blue Stragglers Star (BSS)
population of the galactic globular cluster M5 (NGC 5904) from its very central
regions up to its periphery. The BSS distribution is highly peaked in the
cluster center,... | astro-ph |
0704.0140 | Entanglement entropy of two-dimensional Anti-de Sitter black holes | Using the AdS/CFT correspondence we derive a formula for the entanglement
entropy of the anti-de Sitter black hole in two spacetime dimensions. The
leading term in the large black hole mass expansion of our formula reproduces
exactly the Bekenstein-Hawking entropy S_{BH}, whereas the subleading term
behaves as ln S_{... | hep-th |
0704.0141 | Towards self-consistent definition of instanton liquid parameters | The possibility of self-consistent determination of instanton liquid
parameters is discussed together with the definition of optimal pseudo-particle
configurations and comparing the various pseudo-particle ensembles. The
weakening of repulsive interactions between pseudo-particles is argued and
estimated.
| hep-ph |
0704.0142 | Some aspects of the nonperturbative renormalization of the phi^4 model | A nonperturbative renormalization of the phi^4 model is considered. First we
integrate out only a single pair of conjugated modes with wave vectors +/- q.
Then we are looking for the RG equation which would describe the transformation
of the Hamiltonian under the integration over a shell Lambda - d Lambda < k <
Lambd... | cond-mat.stat-mech |
0704.0143 | Instanton Liquid at Finite Temperature and Chemical Potential of Quarks | Instanton liquid in heated and strongly interacting matter is studied using
the variational principle. The dependence of the instanton liquid density
(gluon condensate) on the temperature and the quark chemical potential is
determined under the assumption that, at finite temperatures, the dominant
contribution is giv... | hep-ph |
0704.0144 | Eternal inflation and localization on the landscape | We model the essential features of eternal inflation on the landscape of a
dense discretuum of vacua by the potential $V(\phi)=V_{0}+\delta V(\phi)$,
where $|\delta V(\phi)|\ll V_{0}$ is random. We find that the diffusion of the
distribution function $\rho(\phi,t)$ of the inflaton expectation value in
different Hubbl... | hep-th astro-ph gr-qc |
0704.0145 | Singularity Resolution in Isotropic Loop Quantum Cosmology: Recent
Developments | Since the past Iagrg meeting in December 2004, new developments in loop
quantum cosmology have taken place, especially with regards to the resolution
of the Big Bang singularity in the isotropic models. The singularity resolution
issue has been discussed in terms of physical quantities (expectation values of
Dirac ob... | gr-qc |
0704.0146 | Vortices in Bose-Einstein Condensates: Theory | Vortices are pervasive in nature, representing the breakdown of laminar fluid
flow and hence playing a key role in turbulence. The fluid rotation associated
with a vortex can be parameterized by the circulation $\Gamma=\oint {\rm d}{\bf
r}\cdot{\bf v}({\bf r})$ about the vortex, where ${\bf v}({\bf r})$ is the
fluid ... | cond-mat.other |
0704.0147 | A POVM view of the ensemble approach to polarization optics | Statistical ensemble formalism of Kim, Mandel and Wolf (J. Opt. Soc. Am. A 4,
433 (1987)) offers a realistic model for characterizing the effect of
stochastic non-image forming optical media on the state of polarization of
transmittedlight. With suitable choice of the Jones ensemble, various Mueller
transformations -... | physics.optics physics.class-ph quant-ph |
0704.0148 | Reexamination of spin decoherence in semiconductor quantum dots from
equation-of-motion approach | The longitudinal and transversal spin decoherence times, $T_1$ and $T_2$, in
semiconductor quantum dots are investigated from equation-of-motion approach
for different magnetic fields, quantum dot sizes, and temperatures. Various
mechanisms, such as the hyperfine interaction with the surrounding nuclei, the
Dresselha... | cond-mat.mtrl-sci |
0704.0149 | Construction of initial data for 3+1 numerical relativity | This lecture is devoted to the problem of computing initial data for the
Cauchy problem of 3+1 general relativity. The main task is to solve the
constraint equations. The conformal technique, introduced by Lichnerowicz and
enhanced by York, is presented. Two standard methods, the conformal
transverse-traceless one an... | gr-qc |
0704.0150 | Magnetism and Thermodynamics of Spin-1/2 Heisenberg Diamond Chains in a
Magnetic Field | The magnetic and thermodynamic properties of spin-1/2 Heisenberg diamond
chains are investigated in three different cases: (a) J1, J2, J3>0
(frustrated); (b) J1, J3<0, J2>0 (frustrated); and (c) J1, J2>0, J3<0
(non-frustrated). The density matrix renormalization group (DMRG) technique is
invoked to study the properti... | cond-mat.str-el |
0704.0151 | Extraction of physical laws from joint experimental data | The extraction of a physical law y=yo(x) from joint experimental data about x
and y is treated. The joint, the marginal and the conditional probability
density functions (PDF) are expressed by given data over an estimator whose
kernel is the instrument scattering function. As an optimal estimator of yo(x)
the conditi... | physics.data-an physics.comp-ph |
0704.0152 | Kinetic equation for finite systems of fermions with pairing | The solutions of the Wigner-transformed time-dependent
Hartree--Fock--Bogoliubov equations are studied in the constant-$\Delta$
approximation. This approximation is known to violate particle-number
conservation. As a consequence, the density fluctuation and the longitudinal
response function given by this approximati... | nucl-th |
0704.0153 | Reciprocal Symmetry and Classical Discrete Oscillator Incorporating
Half-Integral Energy Levels | Classical oscillator differential equation is replaced by the corresponding
(finite time) difference equation. The equation is, then, symmetrized so that
it remains invariant under the change d going to -d, where d is the smallest
span of time. This symmetric equation has solutions, which come in reciprocally
related... | physics.gen-ph |
0704.0154 | Hadrons in Medium -- Theory confronts experiment | In this talk we briefly summarize our theoretical understanding of in-medium
selfenergies of hadrons. With the special case of the $\omega$ meson we
demonstrate that earlier calculations that predicted a significant lowering of
the mass in medium are based on an incorrect treatment of the model Lagrangian;
more consi... | nucl-th hep-ph nucl-ex |
0704.0155 | A computer program for fast non-LTE analysis of interstellar line
spectra | The large quantity and high quality of modern radio and infrared line
observations require efficient modeling techniques to infer physical and
chemical parameters such as temperature, density, and molecular abundances. We
present a computer program to calculate the intensities of atomic and molecular
lines produced i... | astro-ph |
0704.0156 | Nonlinear force-free coronal magnetic field extrapolation scheme based
on the direct boundary integral formulation | This paper has been withdrawn by the authors.
| astro-ph |
0704.0157 | Alternative Approaches to the Equilibrium Properties of Hard-Sphere
Liquids | An overview of some analytical approaches to the computation of the
structural and thermodynamic properties of single component and multicomponent
hard-sphere fluids is provided. For the structural properties, they yield a
thermodynamically consistent formulation, thus improving and extending the
known analytical res... | cond-mat.stat-mech cond-mat.soft physics.chem-ph |
0704.0158 | Complexities of Human Promoter Sequences | By means of the diffusion entropy approach, we detect the scale-invariance
characteristics embedded in the 4737 human promoter sequences. The exponent for
the scale-invariance is in a wide range of $[ {0.3,0.9} ]$, which centered at
$\delta_c = 0.66$. The distribution of the exponent can be separated into left
and ri... | q-bio.OT |
0704.0159 | Evidence for an excitonic insulator phase in 1T-TiSe$_{2}$ | We present a new high-resolution angle-resolved photoemission study of
1\textit{T}-TiSe$_{2}$ in both, its room-temperature, normal phase and its
low-temperature, charge-density wave phase. At low temperature the
photoemission spectra are strongly modified, with large band renormalisations
at high-symmetry points of ... | cond-mat.str-el cond-mat.soft |
0704.0160 | Oxygen-rich droplets and the enrichment of the ISM | We argue that the discrepancies observed in HII regions between abundances
derived from optical recombination lines (ORLs) and collisionally excited lines
(CELs) might well be the signature of a scenario of the enrichment of the
interstellar medium (ISM) proposed by Tenorio-Tagle (1996). In this scenario,
the fresh o... | astro-ph |
0704.0161 | Soft modes and NTE in Zn(CN)2 from Raman spectroscopy and first
principles calculations | We have studied Zn(CN)2 at high pressure using Raman spectroscopy, and report
Gruneisen parameters of the soft phonons. The phonon frequencies and eigen
vectors obtained from ab-initio calculations are used for the assignment of the
observed phonon spectra. Out of the eleven zone-centre optical modes, six modes
exhib... | cond-mat.mtrl-sci |
0704.0162 | Estimation of experimental data redundancy and related statistics | Redundancy of experimental data is the basic statistic from which the
complexity of a natural phenomenon and the proper number of experiments needed
for its exploration can be estimated. The redundancy is expressed by the
entropy of information pertaining to the probability density function of
experimental variables.... | physics.data-an physics.comp-ph |
0704.0163 | Effective potentials for quasicrystals from ab-initio data | Classical effective potentials are indispensable for any large-scale
atomistic simulations, and the relevance of simulation results crucially
depends on the quality of the potentials used. For complex alloys like
quasicrystals, however, realistic effective potentials are practically
inexistent. We report here on our ... | cond-mat.mtrl-sci |
0704.0164 | On smooth foliations with Morse singularities | Let $M$ be a smooth manifold and let $\F$ be a codimension one, $C^\infty$
foliation on $M$, with isolated singularities of Morse type. The study and
classification of pairs $(M,\F)$ is a challenging (and difficult) problem. In
this setting, a classical result due to Reeb \cite{Reeb} states that a manifold
admitting ... | math.GT |
0704.0165 | Frobenius-Schur indicators for semisimple Lie algebras | Let g be a finite dimensional complex semisimple Lie algebra, and let V be a
finite dimensional represenation of g. We give a closed formula for the mth
Frobenius-Schur indicator, m>1, of V in representation-theoretic terms. We
deduce that the indicators take integer values, and that for a large enough m,
the mth ind... | math.QA math.RT |
0704.0166 | Supersymmetry breaking metastable vacua in runaway quiver gauge theories | In this paper we consider quiver gauge theories with fractional branes whose
infrared dynamics removes the classical supersymmetric vacua (DSB branes). We
show that addition of flavors to these theories (via additional non-compact
branes) leads to local meta-stable supersymmetry breaking minima, closely
related to th... | hep-th |
0704.0167 | Low Energy Aspects of Heavy Meson Decays | I discuss low energy aspects of heavy meson decays, where there is at least
one heavy meson in the final state. Examples are $B -\bar{B}$ mixing, $B \to D
\bar{D}$, $B \to D \eta'$, and $B \to D \gamma$. %and $B \to D W $ (Isgur-Wise
function). The analysis is performed in the heavy quark limit within
heavy-light chi... | hep-ph |
0704.0168 | Radiative losses and cut-offs of energetic particles at relativistic
shocks | We investigate the acceleration and simultaneous radiative losses of
electrons in the vicinity of relativistic shocks. Particles undergo pitch angle
diffusion, gaining energy as they cross the shock by the Fermi mechanism and
also emitting synchrotron radiation in the ambient magnetic field. A
semi-analytic approach ... | astro-ph |
0704.0169 | Very strong and slowly varying magnetic fields as source of axions | The investigation on the production of particles in slowly varying but
extremely intense magnetic field in extended to the case of axions. The
motivation is, as for some previously considered cases, the possibility that
such kind of magnetic field may exist around very compact astrophysical
objects.
| hep-ph |
0704.0170 | Symmetry disquisition on the TiOX phase diagram | The sequence of phase transitions and the symmetry of in particular the low
temperature incommensurate and spin-Peierls phases of the quasi one-dimensional
inorganic spin-Peierls system TiOX (TiOBr and TiOCl) have been studied using
inelastic light scattering experiments. The anomalous first-order character of
the tr... | cond-mat.str-el cond-mat.mtrl-sci |
0704.0171 | Discovery of a point-like very-high-energy gamma-ray source in Monoceros | The complex Monoceros Loop SNR/Rosette Nebula region contains several
potential sources of very-high-energy (VHE) gamma-ray emission and two as yet
unidentified high-energy EGRET sources. Sensitive VHE observations are required
to probe acceleration processes in this region. The H.E.S.S. telescope array
has been used... | astro-ph |
0704.0172 | Thermal entanglement of qubit pairs on the Shastry-Sutherland lattice | We show that temperature and magnetic field properties of the entanglement
between spins on the two-dimensional Shastry-Sutherland lattice can be
qualitatively described by analytical results for a qubit tetramer. Exact
diagonalization of clusters with up to 20 sites reveals that the regime of
fully entangled neighbo... | cond-mat.mes-hall cond-mat.str-el |
0704.0173 | Bonding of H in O vacancies of ZnO | We investigate the bonding of H in O vacancies of ZnO using density
functional calculations. We find that H is anionic and does not form
multicenter bonds with Zn in this compound.
| cond-mat.mtrl-sci |
0704.0174 | Reparametrization Invariance, the controversial extraction of $\alpha$
from $B\to\pi\pi$ and New Physics | The extraction of the weak phase $\alpha$ from $B\to\pi\pi$ decays has been
controversial from a statistical point of view, as the frequentist vs. bayesian
confrontation shows. We analyse several relevant questions which have not
deserved full attention and pervade the extraction of $\alpha$.
Reparametrization Invari... | hep-ph hep-ex |
0704.0175 | Solar System Constraints on Gauss-Bonnet Mediated Dark Energy | Although the Gauss-Bonnet term is a topological invariant for general
relativity, it couples naturally to a quintessence scalar field, modifying
gravity at solar system scales. We determine the solar system constraints due
to this term by evaluating the post-Newtonian metric for a distributional
source. We find a mas... | astro-ph gr-qc hep-th |
0704.0176 | Switching mechanism of photochromic diarylethene derivatives molecular
junctions | The electronic transport properties and switching mechanism of single
photochromic diarylethene derivatives sandwiched between two gold surfaces with
closed and open configurations are investigated by a fully self-consistent
nonequilibrium Green's function method combined with density functional theory.
The calculate... | cond-mat.other cond-mat.mtrl-sci |
0704.0177 | Robust manipulation of electron spin coherence in an ensemble of singly
charged quantum dots | Using the recently reported mode locking effect we demonstrate a highly
robust control of electron spin coherence in an ensemble of (In,Ga)As quantum
dots during the single spin coherence time. The spin precession in a transverse
magnetic field can be fully controlled up to 25 K by the parameters of the
exciting puls... | physics.optics |
0704.0178 | Equation of state for dense hydrogen and plasma phase transition | We calculate the equation of state of dense hydrogen within the chemical
picture. Fluid variational theory is generalized for a multi-component system
of molecules, atoms, electrons, and protons. Chemical equilibrium is supposed
for the reactions dissociation and ionization. We identify the region of
thermodynamic in... | physics.plasm-ph |
0704.0179 | Experimental nonclassicality of single-photon-added thermal light states | We report the experimental realization and tomographic analysis of novel
quantum light states obtained by exciting a classical thermal field by a single
photon. Such states, although completely incoherent, possess a tunable degree
of quantumness which is here exploited to put to a stringent experimental test
some of ... | quant-ph |
0704.0180 | Neutron Skin and Giant Resonances in Nuclei | Some aspects, both experimental and theoretical, of extracting the neutron
skin $\Delta R$ from properties of isovector giant resonances are discussed.
Existing proposals are critically reviewed. The method relying on the energy
difference between the GTR and IAS is shown to lack sensitivity to $\Delta R$.
A simple e... | nucl-th |
0704.0181 | Genetic Optimization of Photonic Bandgap Structures | We investigate the use of a Genetic Algorithm (GA) to design a set of
photonic crystals (PCs) in one and two dimensions. Our flexible design
methodology allows us to optimize PC structures which are optimized for
specific objectives. In this paper, we report the results of several such
GA-based PC optimizations. We s... | physics.optics physics.comp-ph |
0704.0182 | Huge magneto-crystalline anisotropy of x-ray linear dichroism observed
on Co/FeMn bilayers | We present an x-ray spectromicroscopic investigation of single-crystalline
magnetic FeMn/Co bilayers on Cu(001), using X-ray magnetic circular (XMCD) and
linear (XMLD) dichroism at the Co and Fe L3 absorption edges in combination
with photoelectron emission microscopy (PEEM). Using the magnetic coupling
between the f... | cond-mat.mtrl-sci |
0704.0183 | Temperature Dependence of the Tensile Properties of Single Walled Carbon
Nanotubes: O(N) Tight Binding MD Simulation | This paper examines the effect of temperature on the structural stability and
mechanical properties of 20 layered (10,10) single walled carbon nanotubes
(SWCNTs) under tensile loading using an O(N) tight binding molecular dynamics
(TBMD) simulation method. We observed that (10,10) tube can sustain its
structural stab... | cond-mat.mtrl-sci |
0704.0184 | Gamma-ray emitting AGN and GLAST | I describe the different classes of Active Galactic Nuclei (AGN) and the
basic tenets of unified schemes. I then review the properties of the
extragalactic sources detected in the GeV and TeV bands, showing that the vast
majority of them belong to the very rare blazar class. I further discuss the
kind of AGN GLAST is... | astro-ph |
0704.0185 | Potfit: effective potentials from ab-initio data | We present a program called potfit which generates an effective atomic
interaction potential by matching it to a set of reference data computed in
first-principles calculations. It thus allows to perform large-scale atomistic
simulations of materials with physically justified potentials. We describe the
fundamental p... | cond-mat.mtrl-sci |
0704.0186 | Dark energy and neutrino model in SUSY -- Remarks on active and sterile
neutrinos mixing -- | We consider a Mass Varying Neutrinos (MaVaNs) model in supersymmetric theory.
The model includes effects of supersymmetry breaking transmitted by the
gravitational interaction from the hidden sector, in which supersymmetry was
broken, to the dark energy sector. Then evolutions of the neutrino mass and the
equation of... | hep-ph |
0704.0187 | The transverse proximity effect in spectral hardness on the line of
sight towards HE 2347-4342 | We report the discovery of 14 quasars in the vicinity of HE2347-4342, one of
the two quasars whose intergalactic HeII forest has been resolved with FUSE. By
analysing the HI and the HeII opacity variations separately, no transverse
proximity effect is detected near three foreground quasars of HE2347-4342:
QSOJ23503-4... | astro-ph |
0704.0188 | Biased random walks on combs | We develop rigorous, analytic techniques to study the behaviour of biased
random walks on combs. This enables us to calculate exactly the spectral
dimension of random comb ensembles for any bias scenario in the teeth or spine.
Two specific examples of random comb ensembles are discussed; the random comb
with nonzero ... | cond-mat.other |
0704.0189 | Monoid generalizations of the Richard Thompson groups | The groups G_{k,1} of Richard Thompson and Graham Higman can be generalized
in a natural way to monoids, that we call M_{k,1}, and to inverse monoids,
called Inv_{k,1}; this is done by simply generalizing bijections to partial
functions or partial injective functions. The monoids M_{k,1} have connections
with circuit... | math.GR |
0704.0190 | The Reliability on the Direction of the Incident Neutrino for the Fully
Contained Events and Partially Contained Events due to QEL in the
Super-Kamiokande | In the SK analysis of the neutrino events for [Fully Contained Events] and
[Partially Contained Events] on their zenith angle distribution, it is assumed
that the zenith angle of the incident neutrino is the same as that of the
detected charged lepton. In the present paper, we examine the validity of [the
SK assumpti... | hep-ex astro-ph hep-ph |
0704.0191 | Intricate Knots in Proteins: Function and Evolution | A number of recently discovered protein structures incorporate a rather
unexpected structural feature: a knot in the polypeptide backbone. These knots
are extremely rare, but their occurrence is likely connected to protein
function in as yet unexplored fashion. Our analysis of the complete Protein
Data Bank reveals s... | physics.bio-ph physics.data-an q-bio.BM |
0704.0192 | Star Formation in Galaxies with Large Lower Surface Brightness Disks | We present B, R, and Halpha imaging data of 19 large disk galaxies whose
properties are intermediate between classical low surface brightness galaxies
and ordinary high surface brightness galaxies. We use data taken from the
Lowell 1.8m Perkins telescope to determine the galaxies' overall morphology,
color, and star ... | astro-ph |
0704.0193 | Domain Wall Dynamics near a Quantum Critical Point | We study the real-time domain-wall dynamics near a quantum critical point of
the one-dimensional anisotropic ferromagnetic spin 1/2 chain. By numerical
simulation, we find the domain wall is dynamically stable in the
Heisenberg-Ising model. Near the quantum critical point, the width of the
domain wall diverges as $(\... | cond-mat.mtrl-sci cond-mat.stat-mech |
0704.0194 | Quantum mechanical approach to decoherence and relaxation generated by
fluctuating environment | We consider an electrostatic qubit, interacting with a fluctuating charge of
single electron transistor (SET) in the framework of exactly solvable model.
The SET plays a role of the fluctuating environment affecting the qubit's
parameters in a controllable way. We derive the rate equations describing
dynamics of the ... | cond-mat.mes-hall quant-ph |
0704.0195 | Group-theoretical properties of nilpotent modular categories | We characterize a natural class of modular categories of prime power
Frobenius-Perron dimension as representation categories of twisted doubles of
finite p-groups. We also show that a nilpotent braided fusion category C admits
an analogue of the Sylow decomposition. If the simple objects of C have
integral Frobenius-... | math.QA math.RT |
0704.0196 | Remarks on N_c dependence of decays of exotic baryons | We calculate the N_c dependence of the decay widths of exotic eikosiheptaplet
within the framework of Chral Quark Soliton Model. We also discuss
generalizations of regular baryon representations for arbitrary N_c.
| hep-ph |
0704.0197 | Analysis of random Boolean networks using the average sensitivity | In this work we consider random Boolean networks that provide a general model
for genetic regulatory networks. We extend the analysis of James Lynch who was
able to proof Kauffman's conjecture that in the ordered phase of random
networks, the number of ineffective and freezing gates is large, where as in
the disorder... | nlin.CG |
0704.0198 | Theory of polariton mediated Raman scattering in microcavities | We calculate the intensity of the polariton mediated inelastic light
scattering in semiconductor microcavities. We treat the exciton-photon coupling
nonperturbatively and incorporate lifetime effects in both excitons and
photons, and a coupling of the photons to the electron-hole continuum. Taking
the matrix elements... | cond-mat.str-el cond-mat.other |
0704.0199 | Decomposition numbers for finite Coxeter groups and generalised
non-crossing partitions | Given a finite irreducible Coxeter group $W$, a positive integer $d$, and
types $T_1,T_2,...,T_d$ (in the sense of the classification of finite Coxeter
groups), we compute the number of decompositions $c=\si_1\si_2 cdots\si_d$ of a
Coxeter element $c$ of $W$, such that $\si_i$ is a Coxeter element in a
subgroup of ty... | math.CO math.GR |
0704.0200 | Electromagnetic polarizabilities and the excited states of the nucleon | The electromagnetic polarizabilities of the nucleon are shown to be
essentially composed of the nonresonant $\alpha_p(E_{0+})=+3.2$,
$\alpha_n(E_{0+})=+4.1$,the $t$-channel $\alpha^t_{p,n}=-\beta^t_{p,n}=+7.6$
and the resonant $\beta_{p,n}(P_{33}(1232))=+8.3$ contributions (in units of
$10^{-4}$fm$^3$. The remaining ... | hep-ph nucl-ex |
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