publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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1995-12-28 | MSSM radiative contributions to the WW$γ$ and WWZ form factors | We evaluate one-loop contributions to the C and P conserving $WW\gamma, WWZ$
form factors in the Minimal Supersymmetric Standard Model (MSSM), and in a more
constrained Supergravity Grand Unified Theory (SUGRA-GUT). A systematic search
of maximal effects in the available parameter space, shows that at LEP2 energy
MSSM ... | 9512437v2 |
1998-07-10 | Inverting the Supersymmetric Standard Model Spectrum: from Physical to Lagrangian Ino Parameters | We examine the possibility of recovering the supersymmetric (and soft
supersymmetry breaking) Lagrangian parameters as direct {\em analytical}
expressions of appropriate physical masses, for the unconstrained (but CP and
R-parity conserving) minimal supersymmetric standard model. We concentrate
mainly on the algebraica... | 9807336v2 |
1999-07-01 | A convergent scheme for one-loop evolutions of the Yukawa couplings in the MSSM | Integrated forms of the one-loop evolution equations are given for the Yukawa
couplings in the MSSM, valid for any value of $\tan \beta$, generalizable to
virtually any number of Yukawa fermions, and including all gauge couplings.
These forms turn out to have nice mathematical convergence properties which we
prove, and... | 9907204v1 |
1999-07-14 | Phases in the gaugino sector: direct reconstruction of the basic parameters and impact on the neutralino pair production | We consider recovering analytically the (generally complex) parameters $\mu$,
$M_1$ and $M_2$ of the gaugino and Higgsino Lagrangian, from appropriate
physical input in the chargino and neutralino sectors. For given $\tan\beta$,
we obtain very simple analytic solutions for $M_2$, $| \mu|$, $Arg[\mu]$ in the
chargino se... | 9907360v1 |
1999-12-08 | Analytical Study of Non-Universality of the Soft Terms in the MSSM | We obtain general analytical forms for the solutions of the one-loop
renormalization group equations in the top/bottom/$\tau$ sector of the MSSM.
These solutions are valid for any value of $\tan \beta$ as well as any
non-universal initial conditions for the soft SUSY breaking parameters and
non-unification of the Yukaw... | 9912271v1 |
2001-01-22 | General one-loop renormalization group evolutions and electroweak symmetry breaking in the (M+1)SSM | We study analytically the general features of electroweak symmetry breaking
in the context of the Minimal Supersymmetric Standard Model extended by one
Higgs singlet. The exact analytical forms of the renormalization group
evolutions of the Yukawa couplings and of the soft supersymmetry breaking
parameters are derived ... | 0101237v1 |
2001-12-28 | Infrared Quasi Fixed Point Structure in Extended Yukawa Sectors and Application to R-parity Violation | We investigate one-loop renormalization group evolutions of extended sectors
of Yukawa type couplings. It is shown that Landau Poles which usually provide
necessary low energy upper bounds that saturate quickly with increasing initial
value conditions, lead in some cases to the opposite behaviour: some of the low
energ... | 0112353v1 |
2005-04-04 | Natural gravitino dark matter in SO(10) gauge mediated supersymmetry breaking | It is shown that gravitinos with mass m_{3/2} ~ 0.1-1 MeV may provide
suitable cold dark matter candidates in scenarios of gauge mediated
supersymmetry breaking (GMSB) under SO(10) grand unification coupled to
supergravity, which accommodate a messenger sector of mass scale M_X ~ 10^6
GeV. This is due to the combined e... | 0504021v2 |
2005-06-14 | Gravitino dark matter in gauge mediated supersymmetry breaking | This paper investigates the parameter space of theories with gauge mediated
supersymmetry breaking leading to gravitino (cold) dark matter with mass
m_{3/2}= 1keV - 10MeV. We pay particular attention to the cosmological role of
messenger fields. Cosmology requires that these messengers decay to the visible
sector if th... | 0506129v2 |
1991-08-22 | On the Perturbations of String-Theoretic Black Holes | The perturbations of string-theoretic black holes are analyzed by
generalizing the method of Chandrasekhar. Attention is focussed on the case of
the recently considered charged string-theoretic black hole solutions as a
representative example. It is shown that string-intrinsic effects greatly alter
the perturbed motion... | 9108012v1 |
1992-10-31 | All Or Nothing: On the Small Fluctuations of Two-Dimensional String-Theoretic Black Holes | A comprehensive analysis of small fluctuations about two-dimensional
string-theoretic and string-inspired black holes is presented. It is shown with
specific examples that two-dimensional black holes behave in a radically
different way from all known black holes in four dimensions. For both the
$SL(2,R)/U(1)$ black hol... | 9210165v3 |
1993-04-01 | Wavelet transforms versus Fourier transforms | This note is a very basic introduction to wavelets. It starts with an
orthogonal basis of piecewise constant functions, constructed by dilation and
translation. The ``wavelet transform'' maps each $f(x)$ to its coefficients
with respect to this basis. The mathematics is simple and the transform is fast
(faster than the... | 9304214v1 |
1998-04-24 | Enumeration of m-ary cacti | The purpose of this paper is to enumerate various classes of cyclically
colored m-gonal plane cacti, called m-ary cacti. This combinatorial problem is
motivated by the topological classification of complex polynomials having at
most m critical values, studied by Zvonkin and others. We obtain explicit
formulae for both ... | 9804119v2 |
2002-08-21 | Toric codes over finite fields | In this note, a class of error-correcting codes is associated to a toric
variety associated to a fan defined over a finite field $\fff_q$, analogous to
the class of Goppa codes associated to a curve. For such a ``toric code''
satisfying certain additional conditions, we present an efficient decoding
algorithm for the d... | 0208155v2 |
2002-12-05 | Automorphisms of hyperbolic groups and graphs of groups | Using the canonical JSJ splitting, we describe the outer automorphism group
$\Out(G)$ of a one-ended word hyperbolic group $G$. In particular, we discuss
to what extent $\Out(G)$ is virtually a direct product of mapping class groups
and a free abelian group, and we determine for which groups $\Out(G)$ is
infinite. We a... | 0212088v1 |
2004-06-08 | The structure and labelled enumeration of K_{3,3}-subdivision-free projective-planar graphs | We consider the class F of 2-connected non-planar K_{3,3}-subdivision-free
graphs that are embeddable in the projective plane. We show that these graphs
admit a unique decomposition as a graph K_5 (the core) where the edges are
replaced by two-pole networks constructed from 2-connected planar graphs. A
method to enumer... | 0406140v5 |
2004-09-16 | Translation equivalence in free groups | Motivated by the work of Leininger on hyperbolic equivalence of homotopy
classes of closed curves on surfaces, we investigate a similar phenomenon for
free groups. Namely, we study the situation when two elements $g,h$ in a free
group $F$ have the property that for every free isometric action of $F$ on an
$\mathbb{R}$-... | 0409284v2 |
2004-11-16 | Characterization and enumeration of toroidal K_{3,3}-subdivision-free graphs | We describe the structure of 2-connected non-planar toroidal graphs with no
K_{3,3}-subdivisions, using an appropriate substitution of planar networks into
the edges of certain graphs called toroidal cores. The structural result is
based on a refinement of the algorithmic results for graphs containing a fixed
K_5-subdi... | 0411356v1 |
2005-01-19 | The outer space of a free product | We associate a contractible ``outer space'' to any free product of groups
G=G_1*...*G_q. It equals Culler-Vogtmann space when G is free,
McCullough-Miller space when no G_i is Z. Our proof of contractibility (given
when G is not free) is based on Skora's idea of deforming morphisms between
trees.
Using the action of ... | 0501288v3 |
2005-07-28 | Free-group automorphisms, train tracks and the beaded decomposition | We study the automorphisms \phi of a finitely generated free group F.
Building on the train-track technology of Bestvina, Feighn and Handel, we
provide a topological representative f:G\to G of a power of \phi that behaves
very much like the realization on the rose of a positive automorphism. This
resemblance is encapsu... | 0507589v2 |
2007-02-02 | Line-of-sight percolation | Given $\omega\ge 1$, let $Z^2_{(\omega)}$ be the graph with vertex set $Z^2$
in which two vertices are joined if they agree in one coordinate and differ by
at most $\omega$ in the other. (Thus $Z^2_{(1)}$ is precisely $Z^2$.) Let
$p_c(\omega)$ be the critical probability for site percolation in
$Z^2_{(\omega)}$. Extend... | 0702061v2 |
2000-03-06 | Entropy Production, Fractals, and Relaxation to Equilibrium | The theory of entropy production in nonequilibrium, Hamiltonian systems,
previously described for steady states using partitions of phase space, is here
extended to time dependent systems relaxing to equilibrium. We illustrate the
main ideas by using a simple multibaker model, with some nonequilibrium initial
state, an... | 0003012v2 |
2002-03-21 | Entropy production of diffusion in spatially periodic deterministic systems | This paper presents an {\it ab initio} derivation of the expression given by
irreversible thermodynamics for the rate of entropy production for different
classes of diffusive processes. The first class are Lorentz gases, where
non-interacting particles move on a spatially periodic lattice, and collide
elastically with ... | 0203046v1 |
2001-11-09 | Spatial diffusion in a periodic optical lattice: revisiting the Sisyphus effect | We numerically study the spatial diffusion of an atomic cloud experiencing
Sisyphus cooling in a three-dimensional lin$\bot$lin optical lattice in a broad
range of lattice parameters. In particular, we investigate the dependence on
the size of the lattice sites which changes with the angle between the laser
beams. We s... | 0111070v2 |
2006-07-24 | Use of specific Green's functions for solving direct problems involving a heterogeneous rigid frame porous medium slab solicited by acoustic waves | A domain integral method employing a specific Green's function (i.e.,
incorporating some features of the global problem of wave propagation in an
inhomogeneous medium) is developed for solving direct and inverse scattering
problems relative to slab-like macroscopically inhomogeneous porous obstacles.
It is shown how to... | 0607212v1 |
2005-12-12 | Cloning, expression and purification of the general stress protein Yhbo from Escherichia coli | We cloned, expressed and purified the Escherichia coli yhbO gene product,
which is homolog to the Bacillus subtilis general stress protein 18 (the yfkM
gene product), the Pyrococcus furiosus intracellular protease PfpI, and the
human Parkinson disease protein DJ-1. The gene coding for YhbO was generated by
amplifying t... | 0512028v1 |
2003-01-24 | Rayleigh Scattering and Atomic Dynamics in Dissipative Optical Lattices | We investigate Rayleigh scattering in dissipative optical lattices. In
particular, following recent proposals (S. Guibal {\it et al}, Phys. Rev. Lett.
{\bf 78}, 4709 (1997); C. Jurczak {\it et al}, Phys. Rev. Lett. {\bf 77}, 1727
(1996)), we study whether the Rayleigh resonance originates from the
diffraction on a dens... | 0301139v1 |
2005-12-19 | More on the Asymmetric Infinite Square Well: Energy Eigenstates with Zero Curvature | We extend the standard treatment of the asymmetric infinite square well to
include solutions that have zero curvature over part of the well. This type of
solution, both within the specific context of the asymmetric infinite square
well and within the broader context of bound states of arbitrary
piecewise-constant poten... | 0512156v1 |
2006-05-09 | Communicating over adversarial quantum channels using quantum list codes | We study quantum communication in the presence of adversarial noise. In this
setting, communicating with perfect fidelity requires using a quantum code of
bounded minimum distance, for which the best known rates are given by the
quantum Gilbert-Varshamov (QGV) bound. By asking only for arbitrarily high
fidelity and all... | 0605086v2 |
2007-05-16 | Quantization Bounds on Grassmann Manifolds of Arbitrary Dimensions and MIMO Communications with Feedback | This paper considers the quantization problem on the Grassmann manifold with
dimension n and p. The unique contribution is the derivation of a closed-form
formula for the volume of a metric ball in the Grassmann manifold when the
radius is sufficiently small. This volume formula holds for Grassmann manifolds
with arbit... | 0705.2272v1 |
2007-05-24 | Local spin dynamic arising from the non-perturbative SU(2) gauge field of the spin orbit effect | 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 fr... | 0705.3502v1 |
2007-06-07 | $^{77}$Se NMR measurements of the $π-d$ exchange field in the organic conductor $λ-$(BETS)$_{2}$FeCl$_{4}$ | $^{77}$Se-NMR spectrum and frequency shift measurements in the paramagnetic
metal (PM) and antiferromagnetic insulating (AFI) phases are reported for a
small single crystal of the organic conductor $\lambda-$(BETS)$_{2}$FeCl$_{4}$
as a function of temperature ($T$) and field alignment for an applied magnetic
field $B_{... | 0706.0933v1 |
2007-11-05 | Feedback Capacity of the Compound Channel | In this work we find the capacity of a compound finite-state channel with
time-invariant deterministic feedback. The model we consider involves the use
of fixed length block codes. Our achievability result includes a proof of the
existence of a universal decoder for the family of finite-state channels with
feedback. As... | 0711.0705v1 |
2007-11-12 | Mutual phase-locking in high frequency microwave nanooscillators as function of field angle | We perform a qualitative analysis of phase locking in a double point-contact
spinvalve system by solving the Landau-Lifshitz-Gilbert-Slonzewski equation
using a hybrid-finite-element method. We show that the phase-locking behaviour
depends on the applied field angle. Starting from a low field angle, the
locking-current... | 0711.1770v2 |
2007-11-14 | Emergent singular solutions of non-local density-magnetization equations in one dimension | We investigate the emergence of singular solutions in a non-local model for a
magnetic system. We study a modified Gilbert-type equation for the
magnetization vector and find that the evolution depends strongly on the length
scales of the non-local effects. We pass to a coupled density-magnetization
model and perform a... | 0711.2177v1 |
2007-11-27 | Nonequilibrium interacting electrons in a ferromagnet | Dynamics of the magnetization in ferromagnets is examined in the presence of
transport electrons allowing the latter to interact. It is found that the
existence of inhomogeneities such as domain wall (DW) structures, leads to
changes that affect the dynamical structure of the equations of motion for the
magnetization. ... | 0711.4170v2 |
2007-12-01 | On Precision - Redundancy Relation in the Design of Source Coding Algorithms | We study the effects of finite-precision representation of source's
probabilities on the efficiency of classic source coding algorithms, such as
Shannon, Gilbert-Moore, or arithmetic codes. In particular, we establish the
following simple connection between the redundancy $R$ and the number of bits
$W$ necessary for re... | 0712.0057v1 |
2007-12-03 | Kinetic models of heterogeneous dissipation | We suggest kinetic models of dissipation for an ensemble of interacting
oriented particles, for example, moving magnetized particles. This is achieved
by introducing a double bracket dissipation in kinetic equations using an
oriented Poisson bracket, and employing the moment method to derive continuum
equations for mag... | 0712.0397v1 |
2007-12-13 | Euler equation of the optimal trajectory for the fastest magnetization reversal of nano-magnetic structures | Based on the modified Landau-Lifshitz-Gilbert equation for an arbitrary
Stoner particle under an external magnetic field and a spin-polarized electric
current, differential equations for the optimal reversal trajectory, along
which the magnetization reversal is the fastest one among all possible reversal
routes, are ob... | 0712.2101v1 |
2007-12-18 | Effect of Edge Roughness on Electronic Transport in Graphene Nanoribbon Channel Metal Oxide Semiconductor Field-Effect Transistors | Results of quantum mechanical simulations of the influence of edge disorder
on transport in graphene nanoribbon metal oxide semiconductor field-effect
transistors (MOSFETs) are reported. The addition of edge disorder significantly
reduces ON-state currents and increases OFF-state currents, and introduces wide
variabili... | 0712.3068v1 |
2007-12-22 | Explicit Non-Adaptive Combinatorial Group Testing Schemes | Group testing is a long studied problem in combinatorics: A small set of $r$
ill people should be identified out of the whole ($n$ people) by using only
queries (tests) of the form "Does set X contain an ill human?". In this paper
we provide an explicit construction of a testing scheme which is better
(smaller) than an... | 0712.3876v5 |
2007-12-31 | Risk management for analytical methods: conciliating objectives of methods, validation phase and routine decision rules | In the industries that involved either chemistry or biology, such as
pharmaceutical industries, chemical industries or food industry, the analytical
methods are the necessary eyes and hear of all the material produced or used.
If the quality of an analytical method is doubtful, then the whole set of
decision that will ... | 0801.0207v1 |
2008-01-06 | An Efficient Method for Quantum Transport Calculations in Nanostructures using Full Band Structure | Scaling of semiconductor devices has reached a stage where it has become
absolutely imperative to consider the quantum mechanical aspects of transport
in these ultra small devices. In these simulations, often one excludes a
rigorous band structure treatment, since it poses a huge computational
challenge. We have propos... | 0801.0880v1 |
2008-01-07 | Magnetization reversal driven by spin-injection : a mesoscopic spin-transfer effect | A mesoscopic description of spin-transfer effect is proposed, based on the
spin-injection mechanism occurring at the junction with a ferromagnet. The
effect of spin-injection is to modify locally, in the ferromagnetic
configuration space, the density of magnetic moments. The corresponding
gradient leads to a current-de... | 0801.1019v1 |
2008-01-25 | New Lower Bounds on Sizes of Permutation Arrays | A permutation array(or code) of length $n$ and distance $d$, denoted by
$(n,d)$ PA, is a set of permutations $C$ from some fixed set of $n$ elements
such that the Hamming distance between distinct members
$\mathbf{x},\mathbf{y}\in C$ is at least $d$. Let $P(n,d)$ denote the maximum
size of an $(n,d)$ PA. This correspon... | 0801.3986v1 |
2008-01-30 | Femtosecond Control of the Magnetization in Ferromagnetic Semiconductors | We develop a theory of collective spin dynamics triggered by ultrafast
optical excitation of ferromagnetic semiconductors. Using the density matrix
equations of motion in the mean field approximation and including magnetic
anisotropy and hole spin dephasing effects, we predict the development of a
light--induced magnet... | 0801.4641v1 |
2008-02-01 | Vortex Ferroelectric Domains | We show experimental switching data on microscale capacitors of
lead-zirconate-titanate (PZT), which reveal time-resolved domain behavior
during switching on a 100-ns scale. For small circular capacitors, an
unswitched domain remains in the center while complete switching is observed in
square capacitors. The observed ... | 0802.0186v1 |
2008-02-11 | Structure and Optimality of Myopic Policy in Opportunistic Access with Noisy Observations | A restless multi-armed bandit problem that arises in multichannel
opportunistic communications is considered, where channels are modeled as
independent and identical Gilbert-Elliot channels and channel state
observations are subject to errors. A simple structure of the myopic policy is
established under a certain condi... | 0802.1379v2 |
2008-02-12 | Domain walls in (Ga,Mn)As diluted magnetic semiconductor | We report experimental and theoretical studies of magnetic domain walls in an
in-plane magnetized (Ga,Mn)As dilute moment ferromagnetic semiconductor. Our
high-resolution electron holography technique provides direct images of domain
wall magnetization profiles. The experiments are interpreted based on
microscopic calc... | 0802.1574v1 |
2008-02-21 | Solving functional reliability issue for an optical electrostatic switch | In this paper, we report the advantage of using AC actuating signal for
driving MEMS actuators instead of DC voltages. The study is based upon micro
mirror devices used in digital mode for optical switching operation. When the
pull-in effect is used, charge injection occurs when the micro mirror is
maintained in the de... | 0802.3075v1 |
2008-02-21 | First principles calculation of spin-interactions and magnetic ground states of Cr trimers on Au(111) | We present calculations of the magnetic ground states of Cr trimers in
different geometries on top of a Au(111) surface. By using a least square fit
method based on a fully relativistic embedded-cluster Green's function method
first we determined the parameters of a classical vector-spin model consisting
of second and ... | 0802.3113v1 |
2008-04-07 | Energy equilibriation processes of electrons, magnons and phonons on the femtosecond timescale | By means of time-resolved Kerr spectroscopy experiments we relate the energy
dissipation processes on the femtosecond (electron-spin relaxation time
$\tau_{el-sp}$) and nanosecond timescale (Gilbert relaxation $\tau_{\alpha}$)
and compare the results to the first microscopic model, which was proposed by
Koopmans. For b... | 0804.0985v1 |
2008-04-07 | Woven Graph Codes: Asymptotic Performances and Examples | Constructions of woven graph codes based on constituent block and
convolutional codes are studied. It is shown that within the random ensemble of
such codes based on $s$-partite, $s$-uniform hypergraphs, where $s$ depends
only on the code rate, there exist codes satisfying the Varshamov-Gilbert (VG)
and the Costello lo... | 0804.0996v2 |
2008-05-26 | Photometric Follow-up Observations of the Transiting Neptune-Mass Planet GJ 436b | This paper presents multi-band photometric follow-up observations of the
Neptune-mass transiting planet GJ 436b, consisting of 5 new ground-based
transit light curves obtained in May 2007. Together with one already published
light curve we have at hand a total of 6 light curves, spanning 29 days. The
analysis of the da... | 0805.3915v2 |
2008-06-04 | Broadband electrical detection of spin excitations in (Ga,Mn)As using a photovoltage technique | We report on microwave photovoltage and simultaneous magnetotransport
measurements in a (Ga,Mn)As film oriented normal to the magnetic field. We
detect the ferromagnetic resonance over a broad frequency range of 2 GHz to
18.5 GHz and determine the spectroscopic g-factor and separate the Gilbert from
the inhomogeneous c... | 0806.0785v1 |
2008-07-10 | Mechanical and Electronic Properties of Ferromagnetic GaMnAs Using Ultrafast Coherent Acoustic Phonons | Ultrafast two-color pump-probe measurements, involving coherent acoustic
phonon (CAP) waves, have provided information simultaneously on the mechanical
properties and on the electronic structure of ferromagnetic GaMnAs. The elastic
constant C11 of Ga1-xMnxAs (0.03<x<0.07) are observed to be systematically
smaller than ... | 0807.1740v2 |
2008-08-05 | A Proof of George Andrews' and Dave Robbins' q-TSPP Conjecture (modulo a finite amount of routine calculations) | In the historic conference Combinatoire Enumerative[LL] wonderfully organized
by Gilbert Labelle and Pierre Leroux there were many stimulating lectures,
including a very interesting one by Pierre Leroux himself, who talked about his
joint work with Xavier Viennot[LV], on solving differential equations
combinatorially! ... | 0808.0571v2 |
2008-08-09 | On some deterministic dictionaries supporting sparsity | We describe a new construction of an incoherent dictionary, referred to as
the oscillator dictionary, which is based on considerations in the
representation theory of finite groups. The oscillator dictionary consists of
order of p^5 unit vectors in a Hilbert space of dimension p, where p is an odd
prime, whose pairwise... | 0808.1368v2 |
2008-08-13 | Spin Filter, Spin Amplifier and Other Spintronic Applications in Graphene Nanodisks | Graphene nanodisk is a graphene derivative with a closed edge. The trigonal
zigzag nanodisk with size $N$ has $N$-fold degenerated zero-energy states. A
nanodisk can be interpletted as a quantum dot with an internal degree of
freedom. The grand state of nanodisk has been argued to be a quasi-ferromagnet,
which is a fer... | 0808.1779v1 |
2008-08-26 | Codes on hypergraphs | Codes on hypergraphs are an extension of the well-studied family of codes on
bipartite graphs. Bilu and Hoory (2004) constructed an explicit family of codes
on regular t-partite hypergraphs whose minimum distance improves earlier
estimates of the distance of bipartite-graph codes. They also suggested a
decoding algorit... | 0808.3453v2 |
2008-09-26 | Ultra-fast spin dynamics: the effect of colored noise | Recent experimental results have pushed the limits of magnetization dynamics
to pico- and femtosecond timescales. This ultra-fast spin dynamics occurs in
extreme conditions of strong and rapidly varying fields and high temperatures.
This situation requires new description of magnetization dynamics, even on a
phenomenol... | 0809.4595v1 |
2008-10-08 | Magnetic particle hyperthermia: Neel relaxation in magnetic nanoparticles under circularly polarized field | The mechanism of magnetization reversal in single-domain ferromagnetic
particles is of interest in many applications, in most of which losses must be
minimized. In cancer therapy by hyperthermia the opposite requirement prevails:
the specific loss power should be maximized. Of the mechanisms of dissipation,
here we stu... | 0810.1455v2 |
2008-10-10 | SOSEMANUK: a fast software-oriented stream cipher | Sosemanuk is a new synchronous software-oriented stream cipher, corresponding
to Profile 1 of the ECRYPT call for stream cipher primitives. Its key length is
variable between 128 and 256 bits. It ac- commodates a 128-bit initial value.
Any key length is claimed to achieve 128-bit security. The Sosemanuk cipher
uses bot... | 0810.1858v1 |
2008-11-14 | Trees of cylinders and canonical splittings | Let T be a tree with an action of a finitely generated group G. Given a
suitable equivalence relation on the set of edge stabilizers of T (such as
commensurability, co-elementarity in a relatively hyperbolic group, or
commutation in a commutative transitive group), we define a tree of cylinders
T_c. This tree only depe... | 0811.2383v2 |
2008-11-21 | Numerical Study of Current-Induced Domain-Wall Dynamics: Crossover from Spin Transfer to Momentum Transfer | We study current-induced dynamics of a magnetic domain wall by solving a
time-dependent Schr\"{o}dinger equation combined with Landau-Lifshitz-Gilbert
equation in a one-dimensional electron system coupled to localized spins. Two
types of domain-wall motions are observed depending on the hard-axis
anisotropy, $K_{\perp}... | 0811.3545v2 |
2008-12-02 | Application of Conformal Mapping to the determination of Magnetic Moment Distributions in typical Antidot Film Nanostructures | There has been an increasing technological interest on magnetic thin films
containing antidot arrays of hexagonal or square symmetry. Part of this
interest is related to the possibility of domain formation and pinning at the
antidots boundaries. In this paper, we develop a method for the calculation of
the magnetic mom... | 0812.0566v1 |
2009-01-09 | A Better Way to Deal the Cards | This paper considers the effect of riffle shuffling on decks of cards,
allowing for some cards to be indistinguishable from other cards. The dual
problem of dealing a game with hands, such as bridge or poker, is also
considered. The Gilbert-Shannon-Reeds model of card shuffling is used, along
with variation distance fo... | 0901.1324v4 |
2009-03-12 | Accuracy thresholds of topological color codes on the hexagonal and square-octagonal lattices | Accuracy thresholds of quantum error correcting codes, which exploit
topological properties of systems, defined on two different arrangements of
qubits are predicted. We study the topological color codes on the hexagonal
lattice and on the square-octagonal lattice by the use of mapping into the spin
glass systems. The ... | 0903.2102v5 |
2009-03-12 | Designing Optimal Flow Networks | We investigate the problem of designing a minimum cost flow network
interconnecting n sources and a single sink, each with known locations and
flows. The network may contain other unprescribed nodes, known as Steiner
points. For concave increasing cost functions, a minimum cost network of this
sort has a tree topology,... | 0903.2124v1 |
2009-04-13 | Refined Coding Bounds and Code Constructions for Coherent Network Error Correction | Coherent network error correction is the error-control problem in network
coding with the knowledge of the network codes at the source and sink nodes.
With respect to a given set of local encoding kernels defining a linear network
code, we obtain refined versions of the Hamming bound, the Singleton bound and
the Gilber... | 0904.1897v2 |
2009-04-27 | Effect of resistance feedback on spin torque-induced switching of nanomagnets | In large magnetoresistance devices spin torque-induced changes in resistance
can produce GHz current and voltage oscillations which can affect magnetization
reversal. In addition, capacitive shunting in large resistance devices can
further reduce the current, adversely affecting spin torque switching. Here, we
simultan... | 0904.4159v2 |
2009-04-30 | A microscopic model for current-induced switching of magnetization for half-metallic leads | We study the behaviour of the magnetization in a half-metallic
ferromagnet/nonmagnetic insulator/ferromagnetic metal/paramagnetic metal
(FM1/NI/FM2/PM) tunnel junction. It is calculated self-consistently within the
nonequilibrium Keldysh formalism. The magnetic regions are treated as band
ferromagnets and are described... | 0904.4821v1 |
2009-05-26 | Scattering Theory of Charge-Current Induced Magnetization Dynamics | In ferromagnets, charge currents can excite magnons via the spin-orbit
coupling. We develop a novel and general scattering theory of charge current
induced macrospin magnetization torques in normal metal$|$ferromagnet$|$normal
metal layers. We apply the formalism to a dirty GaAs$|$(Ga,Mn)As$|$GaAs system.
By computing ... | 0905.4170v2 |
2009-05-28 | Riffle shuffles of a deck with repeated cards | We study the Gilbert-Shannon-Reeds model for riffle shuffles and ask
'How many times must a deck of cards be shuffled for the deck to be in close
to random order?'. In 1992, Bayer and Diaconis gave a solution which gives
exact and asymptotic results for all decks of practical interest, e.g. a deck
of 52 cards. But wh... | 0905.4698v1 |
2009-07-20 | Correcting Limited-Magnitude Errors in the Rank-Modulation Scheme | We study error-correcting codes for permutations under the infinity norm,
motivated by a novel storage scheme for flash memories call rank modulation. In
this scheme, a set of $n$ flash cells are combined to create a single virtual
multi-level cell. Information is stored in the permutation induced by the cell
charge le... | 0907.3387v2 |
2009-07-22 | Searching for variable stars in Galactic Open Clusters | A long-term project, aiming at systematic search for variable stars in
Galactic Open Clusters, was started at the Geneva Observatory in 2002. We have
been observing regularly a sample of twenty-seven Galactic Open Clusters in the
U, B, V Geneva filters. The goal is to identify and to study their variable
stars, as well... | 0907.3834v1 |
2009-07-23 | Variability morphologies in the color-magnitude diagram. Searching for secular variability | This work is part of an effort to detect secular variable objects in large
scale surveys by analysing their path in color-magnitude diagrams. To this aim,
we first present the variability morphologies in the V/V-I diagram of several
types of variable stars. They comprise both periodic and non periodic variable
stars fr... | 0907.4090v1 |
2009-08-03 | Regret Bounds for Opportunistic Channel Access | We consider the task of opportunistic channel access in a primary system
composed of independent Gilbert-Elliot channels where the secondary (or
opportunistic) user does not dispose of a priori information regarding the
statistical characteristics of the system. It is shown that this problem may be
cast into the framew... | 0908.0319v1 |
2009-08-14 | Non-Gaussian Scatter in Cluster Scaling Relations | We investigate the impact of non-Gaussian scatter in the cluster
mass-observable scaling relation on the mass and redshift distribution of
clusters detected by wide area surveys. We parameterize non-Gaussian scatter by
incorporating the third and forth moments (skewness and kurtosis) into the
distribution P(Mobs|M). We... | 0908.1978v1 |
2009-08-17 | A local moment approach to the degenerate Anderson impurity model | The local moment approach is extended to the orbitally-degenerate [SU(2N)]
Anderson impurity model (AIM). Single-particle dynamics are obtained over the
full range of energy scales, focussing here on particle-hole symmetry in the
strongly correlated regime where the onsite Coulomb interaction leads to
many-body Kondo p... | 0908.2245v1 |
2009-10-20 | Bifurcation and chaos in spin-valve pillars in a periodic applied magnetic field | We study the bifurcation and chaos scenario of the macro-magnetization vector
in a homogeneous nanoscale-ferromagnetic thin film of the type used in
spin-valve pillars. The underlying dynamics is described by a generalized
Landau-Lifshitz-Gilbert (LLG) equation. The LLG equation has an especially
appealing form under a... | 0910.3776v1 |
2009-12-08 | Evidence of superconductivity on the border of quasi-2D ferromagnetism in Ca2RuO4 at high pressure | The layered perovskite Ca2RuO4 is a spin-one Mott insulator at ambient
pressure and exhibits metallic ferromagnetism at least up to ~ 80 kbar with a
maximum Curie temperature of 28 K. Above ~ 90 kbar and up to 140 kbar, the
highest pressure reached, the resistivity and ac susceptibility show pronounced
downturns below ... | 0912.1513v1 |
2010-02-24 | JSJ decompositions: definitions, existence, uniqueness. II. Compatibility and acylindricity | This paper and its companion arXiv:0911.3173 have been replaced by
arXiv:1602.05139.
We define the compatibility JSJ tree of a group G over a class of subgroups.
It exists whenever G is finitely presented and leads to a canonical tree (not a
deformation space) which is invariant under automorphisms. Under acylindrici... | 1002.4564v3 |
2010-03-05 | Magnetoresistance in nanostructures: the role of nonuniform current | We developed a method to calculate the magnetoresistance of magnetic
nanostructures. We discretize a magnetic disk in small cells and numerically
solve the Landau-Lifshitz-Gilbert (LLG) equation in order to obtain its
magnetization profile. We consider a anisotropic magnetoresistance (AMR) that
depends on the local mag... | 1003.1323v2 |
2010-03-21 | Current-induced domain wall motion with adiabatic spin torque only in cylindrical nanowires | We investigate current-driven domain wall (DW) propagation in magnetic
nanowires in the framework of the modified Landau-Lifshitz-Gilbert equation
with both adiabatic and nonadiabatic spin torque (NAST) terms. Contrary to the
common opinion that NAST is indispensable for DW motion[1,2], we point out that
adiabatic spin... | 1003.3976v1 |
2010-04-01 | Multipliers of locally compact quantum groups via Hilbert C$^*$-modules | A result of Gilbert shows that every completely bounded multiplier $f$ of the
Fourier algebra $A(G)$ arises from a pair of bounded continuous maps
$\alpha,\beta:G \rightarrow K$, where $K$ is a Hilbert space, and $f(s^{-1}t) =
(\beta(t)|\alpha(s))$ for all $s,t\in G$. We recast this in terms of
adjointable operators ac... | 1004.0215v3 |
2010-04-22 | Optimal time-dependent polarized current pattern for fast domain wall propagation in nanowires: Exact solutions for biaxial and uniaxial anisotropies | One of the important issues in nanomagnetism is to lower the current needed
for a technologically useful domain wall (DW) propagation speed. Based on the
modified Landau-Lifshitz-Gilbert (LLG) equation with both Slonczewski
spin-transfer torque and the field-like torque, we derive the optimal spin
current pattern for f... | 1004.3840v1 |
2010-05-03 | Criticality of an isotropic-to-smectic transition induced by anisotropic quenched disorder | We report combined optical birefringence and neutron scattering measurements
on the liquid crystal 12CB nanoconfined in mesoporous silicon layers. This
liquid crystal exhibits strong nematic-smectic coupling responsible for a
discontinuous isotropic-to-smectic phase transition in the bulk state. Confined
in porous sili... | 1005.0240v1 |
2010-05-21 | A Study on Potential of Integrating Multimodal Interaction into Musical Conducting Education | With the rapid development of computer technology, computer music has begun
to appear in the laboratory. Many potential utility of computer music is
gradually increasing. The purpose of this paper is attempted to analyze the
possibility of integrating multimodal interaction such as vision-based hand
gesture and speech ... | 1005.4014v1 |
2010-05-28 | Dissipative structures in a nonlinear dynamo | This paper considers magnetic field generation by a fluid flow in a system
referred to as the Archontis dynamo: a steady nonlinear magnetohydrodynamic
(MHD) state is driven by a prescribed body force. The field and flow become
almost equal and dissipation is concentrated in cigar-like structures centred
on straight-lin... | 1005.5259v2 |
2010-06-11 | Spherical single-roll dynamos at large magnetic Reynolds numbers | This paper concerns kinematic helical dynamos in a spherical fluid body
surrounded by an insulator. In particular, we examine their behaviour in the
regime of large magnetic Reynolds number $\Rm$, for which dynamo action is
usually concentrated upon a simple resonant stream-surface. The dynamo
eigensolutions are comput... | 1006.2308v2 |
2010-06-11 | On the Queueing Behavior of Random Codes over a Gilbert-Elliot Erasure Channel | This paper considers the queueing performance of a system that transmits
coded data over a time-varying erasure channel. In our model, the queue length
and channel state together form a Markov chain that depends on the system
parameters. This gives a framework that allows a rigorous analysis of the queue
as a function ... | 1006.2403v1 |
2010-06-16 | Storing Small Photonic Cluster States in a Dephasing Environment | We consider the effects of decoherence on the entanglement of photonic
cluster states. Large photonic cluster states can be built by fusing together
smaller photonic cluster states via probabilistic fusion operations. For this
construction process it is necessary to store these smaller cluster states in
some way so as ... | 1006.3192v1 |
2010-08-05 | Subsystem codes with spatially local generators | We study subsystem codes whose gauge group has local generators in the 2D
geometry. It is shown that there exists a family of such codes defined on
lattices of size LxL with the number of logical qubits k and the minimum
distance d both proportional to L. The gauge group of these codes involves only
two-qubit generator... | 1008.1029v1 |
2010-08-14 | Escape of resources in distributed clustering processes | In a distributed clustering algorithm introduced by Coffman, Courtois,
Gilbert and Piret \cite{coffman91}, each vertex of $\mathbb{Z}^d$ receives an
initial amount of a resource, and, at each iteration, transfers all of its
resource to the neighboring vertex which currently holds the maximum amount of
resource. In \cit... | 1008.2426v1 |
2010-08-25 | The self-avoiding walk in a strip | We review the existence of the infinite length self-avoiding walk in the half
plane and its relationship to bridges. We prove that this probability measure
is also given by the limit as $\beta \rightarrow \beta_c-$ of the probability
measure on all finite length walks $\omega$ with the probability of $\omega$
proportio... | 1008.4321v2 |
2010-08-29 | Chirality control via double vortices in asymmetric Co dots | Reproducible control of the magnetic vortex state in nanomagnets is of
critical importance. We report on chirality control by manipulating the size
and/or thickness of asymmetric Co dots. Below a critical diameter and/or
thickness, chirality control is achieved by the nucleation of single vortex.
Interestingly, above t... | 1008.4963v2 |
2010-09-18 | Composite excitation of Josephson phase and spin waves in Josephson junctions with ferromagnetic insulator | Coupling of Josephson-phase and spin-waves is theoretically studied in a
superconductor/ferromagnetic insulator/superconductor (S/FI/S) junction.
Electromagnetic (EM) field inside the junction and the Josephson current
coupled with spin-waves in FI are calculated by combining Maxwell and
Landau-Lifshitz-Gilbert equatio... | 1009.3551v3 |
2010-09-21 | On the Flow-Level Delay of a Spatial Multiplexing MIMO Wireless Channel | The MIMO wireless channel offers a rich ground for quality of service
analysis. In this work, we present a stochastic network calculus analysis of a
MIMO system, operating in spatial multiplexing mode, using moment generating
functions (MGF). We quantify the spatial multiplexing gain, achieved through
multiple antennas... | 1009.4091v1 |
2010-09-22 | Optimal control of magnetization dynamics in ferromagnetic heterostructures by spin--polarized currents | We study the switching-process of the magnetization in a
ferromagnetic-normal-metal multilayer system by a spin polarized electrical
current via the spin transfer torque. We use a spin drift-diffusion equation
(SDDE) and the Landau-Lifshitz-Gilbert equation (LLGE) to capture the coupled
dynamics of the spin density and... | 1009.4296v2 |
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