publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2009-03-03 | Voids and overdensities of coupled Dark Energy | We investigate the clustering properties of dynamical Dark Energy even in
association of a possible coupling between Dark Energy and Dark Matter. We find
that within matter inhomogeneities, Dark Energy migth form voids as well as
overdensity depending on how its background energy density evolves.
Consequently and contr... | 0903.0574v1 |
2009-03-10 | Inelastic scattering in a local polaron model with quadratic coupling to bosons | We calculate the inelastic scattering probabilities in the wide band limit of
a local polaron model with quadratic coupling to bosons. The central object is
a two-particle Green function which is calculated exactly using a purely
algebraic approach. Compared with the usual linear interaction term a quadratic
interactio... | 0903.1786v1 |
2009-03-11 | Quantum breathing mode of trapped bosons and fermions at arbitrary coupling | An analysis of the quantum breathing behavior of few-particle Coulomb systems
in one- and two-dimensional harmonic traps is presented. We report the
existence of \emph{two independent breathing modes} and present exact numerical
results for two particles at any coupling strength which smoothly connect the
two known lim... | 0903.1993v2 |
2009-03-14 | Shear viscosity, instability and the upper bound of the Gauss-Bonnet coupling constant | We compute the dimensionality dependence of $\eta/s$ for charged black branes
with Gauss-Bonnet correction. We find that both causality and stability
constrain the value of Gauss-Bonnet coupling constant to be bounded by 1/4 in
the infinite dimensionality limit. We further show that higher dimensionality
stabilize the ... | 0903.2527v3 |
2009-03-16 | Controlled multiqubit entangled states and quantum transmission in quantum molecule-spin systems | he multiqubit entangled states are coherently controlled in the quantum spin
systems composed of $N+1$ interacting antiferromagnetic molecular rings. The
tunable intermolecular couplings arise from the local exchange interactions
between electron spins of $N$ circumjacent magnets and those of one central
molecular ring... | 0903.2705v1 |
2009-03-18 | Coherent coupling between surface plasmons and excitons in semiconductor nanocrystals | We present an experimental demonstration of strong coupling between a surface
plasmon propagating on a planar silver substrate, and the lowest excited state
of CdSe nanocrystals. Variable-angle spectroscopic ellipsometry measurements
demonstrated the formation of plasmon-exciton mixed states, characterized by a
Rabi sp... | 0903.3248v1 |
2009-03-24 | Generalized circulant matrix in Coupled Map Lattices | In this paper it is shown that a generalized circulant matrix underlies every
weakly Coupled Map Lattice (CML), independently of the form of the coupling
term. Therefore, this matrix will appear always perturbative methods are used
to get the analytical solutions. In fact, the inverse of this matrix provides
the analyt... | 0903.4149v1 |
2009-03-27 | Stability of an [N/2]-dimensional invariant torus in the Kuramoto model at small coupling | When the natural frequencies are allocated symmetrically in the Kuramoto
model there exists an invariant torus of dimension [N/2]+1 (N is the population
size). A global phase shift invariance allows to reduce the model to $N-1$
dimensions using the phase differences, and doing so the invariant torus
becomes [N/2]-dimen... | 0903.4840v1 |
2009-03-30 | Numerical and Analytical Approach to the Quantum Dynamics of Two Coupled Spins in Bosonic Baths | The quantum dynamics of a spin chain interacting with multiple bosonic baths
is described in a mixed Wigner-Heisenberg representation. The formalism is
illustrated by simulating the time evolution of the reduced density matrix of
two coupled spins, where each spin is also coupled to its own bath of harmonic
oscillators... | 0903.5181v1 |
2009-04-01 | Dissociative recombination of BeH^+ | The cross section for dissociative recombination of BeH^+ is calculated by
solution of the time-dependent Schrodinger equation in the local complex
potential approximation. The effects of couplings between resonant states and
the Rydberg states converging to the ground state of the ion are studied. The
relevant potenti... | 0904.0127v1 |
2009-04-02 | Quantum synchronization and entanglement of two qubits coupled to a driven dissipative resonator | Using method of quantum trajectories we study the behavior of two identical
or different superconducting qubits coupled to a quantum dissipative driven
resonator. Above a critical coupling strength the qubit rotations become
synchronized with the driving field phase and their evolution becomes entangled
even if two qub... | 0904.0289v1 |
2009-04-06 | Evolution of the coupling constant in SU(2) lattice gauge theory with two adjoint fermions | We measure the evolution of the coupling constant using the Schroedinger
functional method in the lattice formulation of SU(2) gauge theory with two
massless Dirac fermions in the adjoint representation. We observe strong
evidence for an infrared fixed point, where the theory becomes conformal. We
measure the continuum... | 0904.0864v2 |
2009-04-11 | Coupled Superconducting Phase and Ferromagnetic Order Parameter Dynamics | Via a direct coupling between the magnetic order parameter and the singlet
Josephson supercurrent, we detect spin-wave resonances, and their dispersion,
in ferromagnetic Josephson junctions in which the usual insulating or metallic
barrier is replaced with a weak ferromagnet. The coupling arises within the
Fraunhofer i... | 0904.1780v1 |
2009-04-15 | Yukawa Couplings in Heterotic Compactification | We present a practical, algebraic method for efficiently calculating the
Yukawa couplings of a large class of heterotic compactifications on Calabi-Yau
three-folds with non-standard embeddings. Our methodology covers all of, though
is not restricted to, the recently classified positive monads over favourable
complete i... | 0904.2186v1 |
2009-04-17 | Spin Relaxation in Isotopically Purified Silicon Quantum Dots | We investigate spin-flip processes of Si quantum dots due to spin-orbit
coupling. We utilize the spin-orbit coupling constants related to bulk and
structure inversion asymmetry obtained numerically for two dimensional
heterostructures. We find that the spin-flip rate is very sensitive to these
coupling constants. We in... | 0904.2592v1 |
2009-04-17 | Tailoring Effective Exchange Interactions via Domain Walls in Coupled Heisenberg Rings | The nature of the exchange coupling variation in an antiferromagnetic
spin-1/2 system can be used to tailor its ground-state properties. In
particular, dimerized Heisenberg rings containing domain walls have localized
states which can serve as "flying spin qubits" when the domain walls are moved.
We show theoretically ... | 0904.2783v1 |
2009-04-23 | Quantum Electrodynamics of a Nanocavity Coupled with Exciton Complexes in a Quantum Dot | Here, a comprehensive theory of the couplings between a nanocavity and
exciton complexes in a quantum dot is developed, which successfully predicts
the spectral triplet in the strong coupling regime that has been observed in
several experiments but is unexpected according to conventional cavity quantum
electrodynamics.... | 0904.3697v1 |
2009-05-01 | Coupled photonic crystal nanobeam cavities | We describe the design, fabrication, and spectroscopy of coupled, high
Quality (Q) factor silicon nanobeam photonic crystal cavities. We show that the
single nanobeam cavity modes are coupled into even and odd superposition modes,
and we simulate the frequency and Q factor as a function of nanobeam spacing,
demonstrati... | 0905.0109v1 |
2009-05-02 | Entanglement and Tunable Spin-Spin Couplings Between Trapped Ions Using Multiple Transverse Modes | We demonstrate tunable spin-spin couplings between trapped atomic ions,
mediated by laser forces on multiple transverse collective modes of motion. A
$\sigma_x \sigma_x$-type Ising interaction is realized between quantum bits
stored in the ground hyperfine clock states of Yb ions. We demonstrate
entangling gates and ta... | 0905.0225v1 |
2009-05-05 | Electron-phonon superconductivity in non-centrosymmetric LaNiC$_2$: first principles calculations | We report first principles calculations of the electronic structure and
electron-phonon coupling in the non-centrosymmetric superconductor LaNiC$_2$.
These show that the material is a conventional electron-phonon superconductor
with intermediate coupling. There are large contributions to the coupling by
two low frequen... | 0905.0511v2 |
2009-05-05 | Constraints on the excitations in the Strongly Coupled Standard Model | The Strongly Coupled Standard Model predicts a rich spectrum of excited
states at the Fermi scale. We study the first radial excitations of the vector
bosons. The inclusion of these new states affects the low energy phenomenology
of the model. We put constraints on the effective couplings by performing a
global fit wit... | 0905.0671v2 |
2009-05-07 | Quantum-information transfer in a coupled resonator waveguide | We propose an efficient scheme for the implementation of quantum information
transfer in a onedimensional coupled resonator waveguide. We show that, based
on the effective long-range dipole-dipole interactions between the atoms
mediated by the cavity modes, Raman transitions between the atoms trapped in
different nodes... | 0905.0943v1 |
2009-05-07 | CP violating anomalous top-quark couplings at the LHC | We study the T odd correlations induced by CP violating anomalous top-quark
couplings at both production and decay level in the process gg --> t t_bar -->
(b mu+ nu_mu) (b_bar mu- nu_mu_bar). We consider several counting asymmetries
at the parton level and find the ones with the most sensitivity to each of
these anomal... | 0905.1074v2 |
2009-05-07 | Consequences of lattice imperfections and interchain couplings for the critical properties of spin-1/2 chain compounds | To allow for a comparison of theoretical predictions for spin chains with
experimental data, it is often important to take impurity effects as well as
interchain couplings into account. Here we present the field theory for finite
spin chains at finite temperature and calculate experimentally measurable
quantities like ... | 0905.1075v1 |
2009-05-10 | Cosmic acceleration and crossing of $ω=-1$ in non-minimal modified Gauss-Bonnet gravity | Modified Gauss-Bonnet, i.e, $f(G)$ gravity is a possible explanation of dark
energy. Late time cosmology for the $f(G)$ gravity non-minimally coupled with a
free massless scalar field have been investigated in Ref. [32]. In this paper
we generalize the work of Ref. [32] by including scalar potential in the matter
Lagra... | 0905.1468v1 |
2009-05-11 | Statistical Mechanics of finite arrays of coupled bistable elements | We discuss the equilibrium of a single collective variable characterizing a
finite set of coupled, noisy, bistable systems as the noise strength, the size
and the coupling parameter are varied. We identify distinct regions in
parameter space. The results obtained in prior works in the asymptotic infinite
size limit are... | 0905.1564v1 |
2009-05-12 | Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals | Raman scattering measurements on BiFeO3 single crystals show an important
coupling between the magnetic order and lattice vibrations. The temperature
evolution of phonons shows that the lowest energy E and A1 phonon modes are
coupled to the spin order up to the Neel temperature. Furthermore, low
temperature anomalies a... | 0905.1891v1 |
2009-05-15 | Polarized DIS in N=4 SYM: Where is spin at strong coupling? | Using the AdS/CFT correspondence, we calculate the polarized structure
functions in strongly coupled N=4 supersymmetric Yang-Mills theory deformed in
the infrared. We find that the flavor singlet contribution to the g_1 structure
function is vanishingly small, while the flavor non-singlet contribution shows
the Regge b... | 0905.2493v1 |
2009-05-15 | The four-gluon vertex and the running coupling in Landau gauge Yang-Mills theory | We summarise results for the running coupling from the four-gluon vertex in
Landau gauge, SU($N_c$) Yang-Mills theory as given by a combination of dressing
functions of the vertex and the gluon propagator. These functions have been
determined numerically from the corresponding set of Dyson-Schwinger equations.
In the i... | 0905.2506v1 |
2009-05-18 | Fiber-coupled semiconductor waveguides as an efficient optical interface to a single quantum dipole | We theoretically investigate the interaction of a single quantum dipole with
the modes of a fiber-coupled semiconductor waveguide. Through a combination of
tight modal confinement and phase-matched evanescent coupling, we predict that
approximately 70 % of the dipole's emission can be collected into a single mode
optic... | 0905.2994v2 |
2009-05-22 | Interlayer and interfacial exchange coupling in ferromagnetic metal/semiconductor heterostructures | We describe a systematic study of the exchange coupling between a
magnetically hard metallic ferromagnet (MnAs) and a magnetically soft
ferromagnetic semiconductor (GaMnAs) in bilayer and trilayer heterostructures.
An exchange spring model of MnAs/GaMnAs bilayers accounts for the variation of
the exchange bias field wi... | 0905.3691v2 |
2009-05-26 | Quantum transport through a molecule coupled to a mesoscopic ring: A theoretical study | Transport through a molecule sandwiched between two metallic electrodes and
coupled to a mesoscopic ring that threads a magnetic flux $\phi$ is studied. An
analytic approach for the electron transport through the molecular bridge
system is presented. Electronic transport properties are discussed in two
aspects: (a) pre... | 0905.4175v2 |
2009-05-27 | Strong Coupling Quantum Einstein Gravity at a z=2 Lifshitz Point | We solve a renormalized Wheeler-DeWitt equation for Einstein gravity in D+1
dimensions with D= odd in the strong coupling limit, which is expected to be
suited to probe quantum geometry at short distances, in order to test Horava's
idea that quantum gravity at short distances will be described by a
nonrelativistic syst... | 0905.4326v2 |
2009-05-27 | System size stochastic resonance in driven finite arrays of coupled bistable elements | The global response to weak time periodic forces of an array of noisy,
coupled nonlinear systems might show a nonmonotonic dependence on the number of
units in the array. This effect has been termed system size stochastic
resonance. In this paper, we analyze the nonmonotonic dependence on the system
size of the signal-... | 0905.4470v1 |
2009-05-29 | Spin-lattice coupling, frustration and magnetic order in multiferroic RMnO3 | We have performed high resolution neutron diffraction and inelastic neutron
scattering experiments in the frustrated multiferroic hexagonal compounds RMnO3
(R=Ho, Yb, Sc, Y), which provide evidence of a strong magneto-elastic coupling
in the the whole family. We can correlate the atomic positions, the type of
magnetic ... | 0905.4824v1 |
2009-05-29 | Coupling between M2-branes and Form Fields | In the context of low-energy effective theory of multiple M2-branes, we
construct the interaction terms between the world-volume fields of M2-branes
and the antisymmetric tensor fields of three- and six-forms. By utilizing the
compactification procedure, we show coincidence between the dimensionally
reduced coupling an... | 0905.4840v1 |
2009-06-02 | Coupling of higher-mode-light into a single sliver nanowire | Coupling of higher-order-mode light into a single sliver nanowire and the
degree of the coupling can be controlled by adjusting the light polarization,
showing that nanowire waveguide has no request on the spatial mode of the input
light. Photons with different orbital angular momentums (OAM) are used to
excite surface... | 0906.0406v1 |
2009-06-03 | Non-minimal Maxwell-Modified Gauss-Bonnet Cosmologies: Inflation and Dark Energy | In this paper we show that power-law inflation can be realized in non-minimal
gravitational coupling of electromagnetic field with a general function of
Gauss-Bonnet invariant. Such a non-minimal coupling may appear due to quantum
corrections. We also consider modified Maxwell-$F(G)$ gravity in which
non-minimal coupli... | 0906.0713v1 |
2009-06-05 | Strong Coupling QCD in the Continuum | A short overview of studies of strong coupling problems in hadron physics is
presented. The Schwinger-Dyson/Bethe-Salpeter approach in the continuum allows
the perturbative regime to be connected to the world of strong coupling that
controls confinement and chiral dynamics that in turn determines the properties
of ligh... | 0906.1067v1 |
2009-06-06 | The Vector Meson And Heavy Meson Strong Interaction | We calculate the coupling constants between the light vector mesons and heavy
mesons within the framework of the light-cone QCD sum rule in the leading order
of heavy quark effective theory. The sum rules are very stable with the
variations of the Borel parameter and the continuum threshold. The extracted
couplings wil... | 0906.1287v1 |
2009-06-08 | On gauge coupling constant in linearization of nonlinear supersymmetry | We study in two space-time dimensions (d = 2) the relation between N = 2
supersymmetric (SUSY) QED theory and N = 2 nonlinear (NL) SUSY model by
linearizing N = 2 NLSUSY generally based upon the fundamental notions of the
basic theory. We find a remarkable mechanism which determines theoretically the
magnitude of the b... | 0906.1471v1 |
2009-06-22 | Temporal precision of spike response to fluctuating input in pulse-coupled networks of oscillating neurons | A single neuron is known to generate almost identical spike trains when the
same fluctuating input is repeatedly applied. Here, we study the reliability of
spike firing in a pulse-coupled network of oscillator neurons receiving
fluctuating inputs. We can study the precise responses of the network as
synchronization bet... | 0906.3940v1 |
2009-06-23 | Logarithmic decay of the energy for an hyperbolic-parabolic coupled system | This paper is devoted to the study of a coupled system consisting in a wave
and heat equations coupled through transmission condition along a steady
interface. This system is a linearized model for fluid-structure interaction
introduced by Rauch, Zhang and Zuazua for a simple transmission condition and
by Zhang and Zua... | 0906.4178v1 |
2009-06-23 | Global Attractor of a coupled Two-Cell Brusselator Model | In this work the existence of a global attractor for the solution semiflow of
the coupled two-cell Brusselator model equations is proved. A grouping
estimation method and a new decomposition approach are introduced to deal with
the challenge in proving the absorbing property and the asymptotic compactness
of this type ... | 0906.4345v1 |
2009-06-25 | Quantum impurity models with the Coupled Cluster Method | We investigate the ground-state properties of the Anderson single impurity
model (finite Coulomb impurity repulsion) with the Coupled Cluster Method. We
consider different CCM reference states and approximation schemes and make
comparison with exact Green's function results for the non-interacting model
and with Brillo... | 0906.4684v1 |
2009-06-29 | In-plane noncollinear exchange coupling mediated by helical edge states in Quantum Spin Hall system | We study the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction mediated by
helical edge states in quantum spin hall system. The helical edge states induce
an in-plane noncollinear exchange coupling between two local spins, in contrast
to the isotropic coupling induced in normal metal. The angle between the two
local sp... | 0906.5204v1 |
2009-07-03 | Uniform estimates for metastable transition times in a coupled bistable system | We consider a coupled bistable N-particle system driven by a Brownian noise,
with a strong coupling corresponding to the synchronised regime. Our aim is to
obtain sharp estimates on the metastable transition times between the two
stable states, both for fixed N and in the limit when N tends to infinity, with
error esti... | 0907.0537v2 |
2009-07-17 | Electrically controlled persistent spin currents at the interface of multiferroic oxides | We predict the appearance of a persistent spin current in a two-dimensional
electron gas formed at the interface of multiferroic oxides with a transverse
helical magnetic order. No charge current is generated. This is the result of
an effective spin-orbit coupling generated by the topology of the oxide local
magnetic m... | 0907.3023v1 |
2009-07-20 | Qubit-oscillator dynamics in the dispersive regime: analytical theory beyond rotating-wave approximation | We generalize the dispersive theory of the Jaynes-Cummings model beyond the
frequently employed rotating-wave approximation (RWA) in the coupling between
the two-level system and the resonator. For a detuning sufficiently larger than
the qubit-oscillator coupling, we diagonalize the non-RWA Hamiltonian and
discuss the ... | 0907.3516v1 |
2009-07-21 | Supersolidity in a Bose-Holstein model | We derive an effective d-dimensional Hamiltonian for a system of
hard-core-bosons coupled to optical phonons in a lattice. At non-half-fillings,
a superfluid-supersolid transition occurs at intermediate boson-phonon
couplings, while at strong-couplings the system phase separates. We demonstrate
explicitly that the pres... | 0907.3543v1 |
2009-07-30 | Inter-layer Josephson coupling in stripe-ordered superconducting cuprates | Motivated by experiments on LBCO-1/8 which suggest that stripe order
co-exists with two-dimensional pairing without inter-layer phase coherence over
an extended range of temperatures, we determine the inter-layer Josephson
coupling in the presence of stripe order. We employ a mean-field description of
bond-centered str... | 0907.5202v1 |
2009-08-03 | Pseudoscalar--meson decuplet--baryon coupling constants in light cone QCD | Taking into account the $SU(3)_f$ breaking effects, the strong coupling
constants of the $\pi$, $K$ and $\eta$ mesons with decuplet baryons are
calculated within light cone QCD sum rules method. It is shown that all
coupling constants, even in the case of $SU(3)_f$ breaking, are described in
terms of only one universal... | 0908.0259v1 |
2009-08-19 | Modeling Three and Four Coupled Phase Qubits | The Josephson junction phase qubit has been shown to be a viable candidate
for quantum computation. In recent years, the two coupled phase system has been
extensively studied theoretically and experimentally. We have analyzed the
quantum behavior of three and four capacitively-coupled phase qubits with
different possib... | 0908.2823v1 |
2009-08-21 | Time-resolved Raman Spectroscopy of Optical Phonons in Graphite: Phonon Anharmonic Coupling and Anomalous Stiffening | Time-resolved Raman spectroscopy has been applied to probe the anharmonic
coupling and electron-phonon interaction of optical phonons in graphite. From
the decay of the transient anti-Stokes scattering of the G-mode following
ultrafast excitation, we measured a lifetime of 2.2+/-0.1ps for zone-center
optical phonons. W... | 0908.3036v1 |
2009-08-21 | Bipolaron in the t-J model coupled to longitudinal and transverse quantum lattice vibrations | We explore the influence of two different polarizations of quantum oxygen
vibrations on the spacial symmetry of the bound magnetic bipolaron in the
context of the t-J model by using exact diagonalization within a limited
functional space. Quadratic electron phonon coupling to transverse polarization
stabilizes d-wave s... | 0908.3119v2 |
2009-08-27 | SU(2) lattice gauge theory in 2+1 dimensions: critical couplings from twisted boundary conditions and universality | We present a precision determination of the critical coupling beta_c for the
deconfinement transition in pure SU(2) gauge theory in 2+1 dimensions. This is
possible from universality, by intersecting the center vortex free energy as a
function of the lattice coupling beta with the exactly known value of the
interface f... | 0908.4030v1 |
2009-08-28 | Global existence for coupled systems of nonlinear wave and Klein-Gordon equations in three space dimensions | We consider the Cauchy problem for coupled systems of wave and Klein-Gordon
equations with quadratic nonlinearity in three space dimensions. We show global
existence of small amplitude solutions under certain condition including the
null condition on self-interactions between wave equations. Our condition is
much weake... | 0908.4137v3 |
2009-08-29 | Spin-Phonon Coupling in Iron Pnictide Superconductors | The magnetic moment in the parent phase of the iron-pnictide superconductors
varies with composition even when the nominal charge of iron is unchanged. We
propose the spin-lattice coupling due to the magneto-volume effect as the
primary origin of this effect, and formulate a Landau theory to describe the
dependence of ... | 0908.4361v1 |
2009-09-13 | Synchronization in discrete-time networks with general pairwise coupling | We consider complete synchronization of identical maps coupled through a
general interaction function and in a general network topology where the edges
may be directed and may carry both positive and negative weights. We define
mixed transverse exponents and derive sufficient conditions for local complete
synchronizati... | 0909.2416v1 |
2009-09-14 | Electron transport through a quantum wire coupled with a mesoscopic ring | Electronic transport through a quantum wire sandwiched between two metallic
electrodes and coupled to a quantum ring, threaded by a magnetic flux $\phi$,
is studied. An analytic approach for the electron transport through the bridge
system is presented based on the tight-binding model. The transport properties
are disc... | 0909.2509v1 |
2009-09-16 | Energies and Entanglement in Multiply-coupled Phase Qubit Systems | The superconducting Josephson junction has been demonstrated to be a strong
candidate for building quantum bits or "qubits" which are the components of a
future quantum computer. In recent years, considerable theoretical and
experimental effort have been focused on studying quantum properties of single
qubits and two c... | 0909.3082v1 |
2009-09-24 | Unification of Gauge Couplings in the E(6)SSM | We argue that in the two-loop approximation gauge coupling unification in the
exceptional supersymmetric standard model can be achieved for any
phenomenologically reasonable value of strong gauge coupling at the electroweak
scale consistent with the experimentally measured central value. | 0909.4530v2 |
2009-09-28 | Synchronization in Networks of Coupled Harmonic Oscillators with Stochastic Perturbation and Time Delays | In this paper, we investigate synchronization of coupled second-order linear
harmonic oscillators with random noises and time delays. The interaction
topology is modeled by a weighted directed graph and the weights are perturbed
by white noise. On the basis of stability theory of stochastic differential
delay equations... | 0909.4987v1 |
2009-09-29 | Fermions and noncommutative emergent gravity II: Curved branes in extra dimensions | We study fermions coupled to Yang-Mills matrix models from the point of view
of emergent gravity. The matrix model Dirac operator provides an appropriate
coupling for fermions to the effective gravitational metric for general branes
with nontrivial embedding, albeit with a non-standard spin connection. This
generalizes... | 0909.5298v2 |
2009-09-29 | Singlet scalar dark matter effects on Higgs boson driven inflation | A minimal candidate for dark matter is provided by a stable standard model
singlet hermitian scalar field. The quantum mechanical effects of this singlet
are explored in a model where the standard model Higgs boson has a large
non-minimal coupling to the Ricci scalar and plays the role of the inflaton.
Imposition of th... | 0909.5353v1 |
2009-10-01 | Cosmological consequences of the NonCommutative Geometry Spectral Action | Cosmological consequences of the noncommutative geometry spectral action are
presented. Neglecting the nonminimal coupling of the Higgs field to the
curvature, background cosmology remains unchanged, and only the inhomogeneous
perturbations will evolve differently from the equivalent classical system.
However, consider... | 0910.0181v1 |
2009-10-02 | Investigations on the Property of $f_0(600)$ and $f_0(980)$ Resonances in $γγ\to ππ$ Process | Using dispersion relation technique and experimental data, a coupled channel
analysis on $\gamma\gamma\to\pi\pi$ process is made. Di-photon coupling of
$f_0(600)$ and $f_0(980)$ resonances are extracted and their dynamical
properties are discussed. Especially we study the physical meaning of the
coupling constant $g^2_... | 0910.0341v1 |
2009-10-13 | Study of symmetry in F(R) theory of gravity | An action in which the Ricci scalar is nonminimally coupled with a scalar
field and contains higher order curvature invariant terms carries a conserved
current under certain conditions that decouples geometric part from the scalar
field. The conserved current relates the pair of arbitrary coupling parameters
$f(\phi)$ ... | 0910.2385v1 |
2009-10-22 | Magnetic dipole moments in single and coupled split-ring resonators | We examine the role of magnetic dipoles in single and coupled pairs of
metallic split-ring resonators by numerically computing their magnitude and
examining their relative contributions to the scattering cross section. We
demonstrate that magnetic dipoles can strongly influence the scattering cross
section along partic... | 0910.4210v1 |
2009-10-24 | Coupling an epitaxial quantum dot to a fiber-based external-mirror microcavity | We report the coupling of individual InAs quantum dots (QDs) to an
external-mirror microcavity. The external mirror is bonded to a fiber and
positioned above a semiconductor sample consisting of a QD-containing GaAs
layer on top of a distributed Bragg reflector (DBR). This open cavity can be
rapidly tuned with a piezoe... | 0910.4658v1 |
2009-10-26 | Spin Superfluidity versus Solidity of Ultracold Polar Molecules | We present a technique for engineering quantum magnets via ultracold polar
molecules in optical lattices and explore exotic interplay between its spin
superfluidity and solidity. The molecular ground and first excited rotational
states are resonantly coupled by a linearly polarized microwave field. The
spin-up (spin-do... | 0910.4922v1 |
2009-10-26 | Running Gauge Coupling in Asymptotically Safe Quantum Gravity | We investigate the non-perturbative renormalization group behavior of the
gauge coupling constant using a truncated form of the functional flow equation
for the effective average action of the Yang-Mills-gravity system. We find a
non-zero quantum gravity correction to the standard Yang-Mills beta function
which has the... | 0910.4938v2 |
2009-10-28 | Vacuum Ambiguity in de Sitter Space at Strong Coupling | It is well known that in the weak coupling regime, quantum field theories in
de Sitter space do not have a unique vacuum, but a class of vacua parametrized
by a complex parameter $\alpha$, i.e., the so-called $\alpha$-vacua. In this
article, using gauge/gravity duality, we calculate the symmetric two-point
function of ... | 0910.5509v3 |
2009-11-06 | Kondo impurity on the honeycomb lattice at half-filling | We consider a Kondo-like impurity interacting with fermions on a honeycomb
lattice at half-filling, as in the case of graphene. We derive from the lattice
model an effective one-dimensional continuum theory which has, in general, four
flavors with angular momentum mixing in the presence of internode scattering
processe... | 0911.1255v1 |
2009-11-06 | Topological Casimir effect in power-law FRW cosmologies | We investigate the vacuum expectation values of the field squared and the
energy-momentum tensor for a massless scalar field with general curvature
coupling parameter in spatially flat Friedmann-Robertson-Walker universes with
an arbitrary number of toroidally compactified dimensions. When the comoving
lengths of the c... | 0911.1260v1 |
2009-11-11 | CP invariance of chiral gauge theories and Majorana-Yukawa couplings on the lattice | The construction of CP-invariant lattice chiral gauge theories and the
construction of lattice Majorana fermions with chiral Yukawa couplings is
subject to topological obstructions. In the present work we suggest lattice
extensions of charge and parity transformation for Weyl fermions. This enables
us to construct latt... | 0911.2038v1 |
2009-11-11 | Right on time: Measuring Kuramoto model coupling from a survey of wristwatches | Using a survey of wristwatch synchronization from a randomly selected group
of independent volunteers, one can model the system as a Kuramoto-type coupled
oscillator network. Based on the phase data, both the order parameter and an
estimated value of the coupling is derived and the possibilities for similar
research to... | 0911.2158v3 |
2009-11-14 | Non-geodesic motion in $f({\mathcal G})$ gravity with non-minimal coupling | The dynamics of test particles in $f(\mathcal G)$ modified Gauss-Bonnet
gravity is investigated. It is shown that in $f({\mathcal G})$ gravity models
with non-minimal coupling to matter, particles experience an extra force normal
to their four-velocities and as a result move along non- geodesic world-lines.
The explici... | 0911.2754v1 |
2009-11-16 | Calculating the running coupling in strong electroweak models | One possibility for Beyond Standard Model physics is a new
strongly-interacting gauge theory. One way to determine if a non-abelian gauge
theory is QCD-like or conformal is to measure the running of the renormalized
gauge coupling. We define the renormalized coupling from Wilson loop ratios,
and measure these ratios vi... | 0911.2934v1 |
2009-11-16 | Matter Lagrangians Coupled with Connections | We shall here consider extended theories of gravitation in the metric-affine
formalism with matter coupled directly to the connection. A sufficiently
general procedure will be exhibited to solve the resulting field equation
associated to the connection. As special cases one has the no-coupling case
(which is standard i... | 0911.2981v2 |
2009-11-17 | Large polaron formation induced by Rashba spin-orbit coupling | Here the electron-phonon Holstein model with Rashba spin-orbit interaction is
studied for a two dimensional square lattice in the adiabatic limit. It is
demonstrated that a delocalized electron at zero spin-orbit coupling localizes
into a large polaron state as soon as the Rashba term is nonzero. This
spin-orbit induce... | 0911.3206v2 |
2009-11-22 | Synchronization and Collective Dynamics in a Carpet of Microfluidic Rotors | We study synchronization of an array of rotors on a substrate that are
coupled by hydrodynamic interaction. The rotors that are modeled by an
effective rigid body, are driven by an internal torque and exerts an active
force on the surrounding fluid. The long-ranged nature of the hydrodynamic
interaction between the rot... | 0911.4253v2 |
2009-11-23 | Transport through a Kondo quantum dot: Functional RG approach | We apply the functional renormalization group (FRG) method to calculate the
conductance of a quantum dot in the Kondo regime. Starting from the exact FRG
equations in Keldysh formulation for the Kondo exchange Hamiltonian in
pseudo-fermion (pf) representation, we solve the coupled equations for the pf
self energy and t... | 0911.4383v1 |
2009-11-26 | Quantum state transfer via temporal kicking of information | We propose a strategy for perfect state transfer in spin chains based on the
use of an unmodulated coupling Hamiltonian whose coefficients are explicitly
time dependent. We show that, if specific and non-demanding conditions are
satisfied by the temporal behavior of the coupling strengths, our model allows
perfect stat... | 0911.5160v2 |
2009-11-30 | Breakdown of perturbative weak coupling approaches for the biomolecular energy transfer | We show that the biomolecular exciton dynamics under the influence of slow
polarization fluctuations in the solvent cannot be described by approaches
which are perturbative in the system-bath coupling. For this, we compare
results for the decoherence rate of the exciton dynamics of a resumed
perturbation theory with nu... | 0911.5590v1 |
2010-01-05 | Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study | The superconducting transition temperature, Tc, of the SrTiO3/LaAlO3
interface was varied by the electric field effect. The anisotropy of the upper
critical field and the normal state magneto-transport were studied as a
function of gate voltage. The spin-orbit coupling energy is extracted. This
tunable energy scale is ... | 1001.0781v1 |
2010-01-07 | Energy Dissipation and Regularity for a Coupled Navier-Stokes and Q-Tensor System | We study a complex non-newtonian fluid that models the flow of nematic liquid
crystals. The fluid is described by a system that couples a forced
Navier-Stokes system with a parabolic-type system. We prove the existence of
global weak solutions in dimensions two and three. We show the existence of a
Lyapunov functional ... | 1001.1032v1 |
2010-01-12 | Pairing and condensation in a resonant Bose-Fermi mixture | We study by diagrammatic methods a mixture of single-component bosons and
fermions, with boson-fermion coupling tuned by a Fano-Feshbach resonance. For
increasing coupling, the growing boson-fermion pairing correlations
progressively reduce the boson condensation temperature and make it eventually
vanish at a critical ... | 1001.1971v1 |
2010-01-15 | Stochastic Semi-Classical Description of Fusion at Near-Barrier Energies | Fusion reactions of heavy ions are investigated by employing a simple
stochastic semi-classical model which includes the coupling between relative
motion and low frequency collective surface modes of colliding ions similarly
to the quantal coupled-channels description. The quantal effect enters into the
calculation thr... | 1001.2658v2 |
2010-01-18 | Resonance induced by repulsive interactions in a model of globally-coupled bistable systems | We show the existence of a competition-induced resonance effect for a generic
globally coupled bistable system. In particular, we demonstrate that the
response of the macroscopic variable to an external signal is optimal for a
particular proportion of repulsive links. Furthermore, we show that a resonance
also occurs f... | 1001.2993v1 |
2010-01-18 | Polyakov Loops in Strongly-Coupled Plasmas with Gravity Duals | We study the properties of the Polyakov loop in strongly-coupled gauge
plasmas that are conjectured to be dual to five dimensional theories of gravity
coupled to a nontrivial single scalar field. We find a gravity dual that can
describe the thermodynamic properties and also the expectation value of the
Polyakov loop in... | 1001.3155v1 |
2010-01-19 | Isospin breaking effects in the dynamical generation of the X(3872) | We have studied isospin breaking effects in the X(3872) resonance and found a
natural explanation for the branching fraction of the X decaying to $J/\psi$
with two and three pions being close to unit. Within our framework the X(3872)
is a dynamically generated resonance in coupled channels. We also study the
relationsh... | 1001.3254v1 |
2010-01-26 | Uniformity Studies of Scintillator Tiles directly coupled to SiPMs for Imaging Calorimetry | We present a novel geometry of scintillator tiles developed for fiberless
coupling to silicon photomultipliers (SiPMs) for applications in highly
granular calorimeters. A high degree of uniformity of the tile response over
the full active area was achieved by a drilled slit at the coupling position of
the photon sensor... | 1001.4665v2 |
2010-01-26 | Bouncing Universe and Reconstructing Vector Field | Motivated by the recent works of Refs. \cite{R1, R2} where a model of
inflation has been suggested with non-minimally coupled massive vector fields,
we generalize their work to the study of the bouncing solution. So we consider
a massive vector field, which is non-minimally coupled to gravity. Also we
consider non-mini... | 1001.4682v1 |
2010-01-26 | Observation of excited states in a graphene double quantum dot | We study a graphene double quantum dot in different coupling regimes. Despite
the strong capacitive coupling between the dots, the tunnel coupling is below
the experimental resolution. We observe additional structures inside the
finite-bias triangles, part of which can be attributed to electronic excited
dot states, wh... | 1001.4700v1 |
2010-01-30 | Thermoelectrically Controlled Spin-Switch | The search for novel spintronic devices brings about new ways to control
switching in magnetic thin-films. In this work we experimentally demonstrate a
device based on thermoelectrically controlled exchange coupling. The read out
signal from a giant magnetoresistance element is controlled by exchange
coupling through a... | 1002.0089v1 |
2010-01-30 | Exchange coupling and magnetoresistance in CoFe/NiCu/CoFe spin-valves near the Curie point of the spacer | Thermal control of exchange coupling between two strongly ferromagnetic
layers through a weakly ferromagnetic Ni-Cu spacer and the associated
magnetoresistance is investigated. The spacer, having a Curie point slightly
above room temperature, can be cycled between its paramagnetic and
ferromagnetic states by varying th... | 1002.0090v1 |
2010-01-31 | Perturbation of heliosynchronous orbits in stable Kaluza-Klein theory | Although the methods and techniques have been greatly improved since the late
nineteenth century, the precision on the measurement of the gravitational
constant G does not exceed 1 part in 1000. Intrinsic variations of G caused by
the geomagnetic field may explain the observed dispersion of the laboratory
measurements.... | 1002.0116v1 |
2010-02-16 | Slow-roll Extended Quintessence | We derive the slow-roll conditions for a non-minimally coupled scalar field
(extended quintessence) during the radiation/matter dominated era extending our
previous results for thawing quintessence. We find that the ratio
$\ddot\phi/3H\dot\phi$ becomes constant but negative, in sharp contrast to the
ratio for the minim... | 1002.2986v2 |
2010-02-22 | Wave-packet analysis of interference patterns in output coupled atoms | We study the output coupling of atoms from a magnetic trap into a linear
potential slope of gravity using a weak radio-frequency field. We present a
one-dimensional wave-packet model based on a continuous loading of a continuous
spectrum of generalised eigenstates to describe the scenario. Analyzing the
model, we show ... | 1002.4184v1 |
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