publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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1999-11-30 | Coupling of vector fields at high energies | In general relativity and electrodynamics fields are always generated from
static monopoles (like mass or electric charge) or their corresponding currents
by surrounding them in a spherical configuration. We investigate a generation
of fields from primary fields by a scalar coupling. The generated secondary
fields fulf... | 9911250v3 |
1999-12-21 | Scalar Quartic Couplings in Type IIB Supergravity on $AdS_5\times S^5$ | All quartic couplings of scalar fields $s^I$ that are dual to extended chiral
primary operators in ${\cal N}=4$ SYM$_4$ are derived by using the covariant
equations of motion for type IIB supergravity on $AdS_5\times S^5$. It is shown
that despite some expectations if one keeps the structure of the cubic terms
untouche... | 9912210v4 |
2000-09-08 | Singular Phases of Seiberg-Witten Integrable Systems: Weak and Strong Coupling | We consider the singular phases of the smooth finite-gap integrable systems
arising in the context of Seiberg-Witten theory. These degenerate limits
correspond to the weak and strong coupling regimes of SUSY gauge theories. The
spectral curves in such limits acquire simpler forms: in most cases they become
rational, an... | 0009060v2 |
2001-01-17 | Two-Point Stress-Tensor Correlator in N=1 SYM(2+1) | Recent advances in string theory have highlighted the need for reliable
numerical methods to calculate correlators at strong coupling in supersymmetric
theories. We present a calculation of the correlator <0|T^{++}(r)T^{++}(0)|0>
in N=1 SYM theory in 2+1 dimensions. The numerical method we use is
supersymmetric discret... | 0101120v1 |
2001-04-17 | Ramond-Ramond Couplings of Noncommutative D-branes | We propose the leading couplings, in an alpha' expansion, of noncommutative
D-branes to RR potentials in a constant NSNS B-field for an arbitrary choice of
noncommutative parameter. The proposal is motivated by some string amplitude
computations. The zero momentum couplings are topological in nature and involve
Elliott... | 0104139v2 |
2002-05-30 | Couplings in Pseudo-Supersymmetry | We analyze theories in which a supersymmetric sector is coupled to a
supersymmetry-breaking sector described by a non-linear realization. We show
how to consistently couple N=1 supersymmetric matter to non-supersymmetric
matter in such a way that all interactions are invariant under non-linear
supersymmetry transformat... | 0205300v3 |
2002-11-11 | Non-renormalization theorems from extension to local coupling | The extension of coupling constants to space-time dependent fields, the local
couplings, makes possible to derive the non-renormalization theorems of
supersymmetry by an algebraic characterization of Lagrangian N=1
supermultiplets. For super-Yang-Mills theories the construction implies
non-renormalization of the coupli... | 0211085v1 |
2003-01-20 | Yukawa couplings in SO(10) heterotic M-theory vacua | We demonstrate the existence of a class of N=1 supersymmetric nonperturbative
vacua of Horava-Witten M-theory compactified on a torus fibered Calabi-Yau
3-fold Z with first homotopy group \pi_{1}(Z)= Z2, having the following
properties: 1) SO(10) grand unification group, 2) net number of three
generations of chiral fer... | 0301147v1 |
2003-08-28 | N=1 Worldsheet Boundary Couplings and Covariance of non-Abelian Worldvolume Theory | A systematic construction is given for N=1 open string boundary coupling to
Abelian and non-Abelian Dp-brane worldvolume fields, in general curved
backgrounds. The basic ingredient is a set of four ``boundary vectors'' that
provide a unified description of boundary conditions and boundary couplings. We
then turn to the... | 0308201v1 |
2003-10-03 | Spin-Spin and Spin-Orbit Interactions in Strongly Coupled Gauge Theories | We evaluate the spin-orbit and spin-spin interaction between two fermions in
strongly coupled gauge theories in their Coulomb phase. We use the
quasi-instantaneous character of Coulomb's law at strong coupling to resum a
class of ladder diagrams. For ${\cal N}=4$ SYM we derive both weak and strong
coupling limits of th... | 0310031v1 |
2003-10-18 | Coupling the Supersymmetric 210 Vector Multiplet to Matter in SO(10) | An analysis of the couplings of the 210 dimensional SO(10) vector multiplet
to matter is given. Specifically we give an $SU(5)\times U(1)$ decomposition of
the vector couplings $\bar{16}_{\pm}-16_{\pm}-210$, where $16_{\pm}$ is the
semispinor of SO(10) chirality ${\pm}$, using a recently derived basic theorem.
The anal... | 0310178v1 |
2003-11-30 | One-loop Gauge Couplings in Orbifold Field Theories | We discuss the gauge coupling renormalization in orbifold field theories in
which the 4-dimensional graviton and/or matter fields are quasi-localized in
extra dimension to generate hierarchically different mass scales and/or Yukawa
couplings. In such theories, there can be large calculable Kaluza-Klein
threshold correc... | 0312006v2 |
2004-01-13 | Casimir Energies and Pressures for $δ$-function Potentials | The Casimir energies and pressures for a massless scalar field associated
with $\delta$-function potentials in 1+1 and 3+1 dimensions are calculated. For
parallel plane surfaces, the results are finite, coincide with the pressures
associated with Dirichlet planes in the limit of strong coupling, and for weak
coupling d... | 0401090v1 |
2004-04-02 | N=4 central charge superspace at work for supergravity coupled to an arbitrary number of abelian vector multiplets | We present the description in central charge superspace of N=4 supergravity
with antisymmetric tensor coupled to an arbitrary number of abelian vector
multiplets. All the gauge vectors of the coupled system are treated on the same
footing as gauge fields corresponding to translations along additional bosonic
coordinate... | 0404019v1 |
2004-04-27 | Stochastic formulation of the renormalization group: supersymmetric structure and topology of the space of couplings | The exact or Wilson renormalization group equations can be formulated as a
functional Fokker-Planck equation in the infinite-dimensional configuration
space of a field theory, suggesting a stochastic process in the space of
couplings. Indeed, the ordinary renormalization group differential equations
can be supplemented... | 0404212v1 |
2004-05-22 | The static potential in QED$_3$ with non-minimal coupling | Here we study the effect of the non-minimal coupling $j^{\mu}\eps
\partial^{\nu} A^{\alpha} $ on the static potential in multiflavor QED$_3$.
Both cases of four and two components fermions are studied separately at
leading order in the $1/N $ expansion. Although a non-local Chern-Simons term
appears, in the four compon... | 0405196v1 |
2004-06-14 | Yukawa Coupling Structure in Intersecting D-brane Models | The structure of Yukawa coupling matrices is investigated in type IIA
T^6/(Z_2 x Z_2) orientifold models with intersecting D-branes. Yukawa coupling
matrices are difficult to be realistic in the conventional models in which the
generation structure emerges by the multiple intersection of D-branes in the
factorized T^6 ... | 0406115v3 |
2005-02-03 | N=1 RG Flows, Product Groups, and a-Maximization | We explore new IR phenomena and dualities, arising for product groups, in the
context of N=1 supersymmetric gauge theories. The RG running of the multiple
couplings can radically affect each other. For example, an otherwise IR
interacting coupling can be driven to be instead IR free by an arbitrarily
small, but non-zer... | 0502049v1 |
2005-02-23 | Space-time dependent couplings in N=1 SUSY gauge theories: Anomalies and Central Functions | We consider N=1 supersymmetric gauge theories in which the couplings are
allowed to be space-time dependent functions. Both the gauge and the
superpotential couplings become chiral superfields. As has recently been shown,
a new topological anomaly appears in models with space-time dependent gauge
coupling. Here we show... | 0502214v1 |
2005-03-16 | Infinite reduction of couplings in non-renormalizable quantum field theory | I study the problem of renormalizing a non-renormalizable theory with a
reduced, eventually finite, set of independent couplings. The idea is to look
for special relations that express the coefficients of the irrelevant terms as
unique functions of a reduced set of independent couplings lambda, such that
the divergence... | 0503131v2 |
2005-03-21 | Renormalization of Supersymmetric Gauge Theories on Orbifolds: Brane Gauge Couplings and Higher Derivative Operators | We consider supersymmetric gauge theories coupled to hyper multiplets on five
and six dimensional orbifolds and determine the bulk and local fixed point
renormalizations of the gauge couplings. We infer from a component analysis
that the hyper multiplet does not induce renormalization of the brane gauge
couplings on th... | 0503153v1 |
2005-04-11 | A transition in the spectrum of the topological sector of $φ_2^4$ theory at strong coupling | We investigate the strong coupling region of the topological sector of the
two-dimensional $\phi^4$ theory. Using discrete light cone quantization (DLCQ),
we extract the masses of the lowest few excitations and observe level
crossings. To understand this phenomena, we evaluate the expectation value of
the integral of t... | 0504094v1 |
2005-07-01 | Energy conditions for a generally coupled scalar field outside a reflecting sphere | We calculate the stress-energy tensor for a scalar field with general
curvature coupling, outside a perfectly reflecting sphere with Dirichlet
boundary conditions. For conformal coupling we find that the null energy
condition is always obeyed, and therefore the averaged null energy condition
(ANEC) is also obeyed. Sinc... | 0507013v3 |
2005-07-26 | Quantum Gravity, Torsion, Parity Violation and all that | We discuss the issue of parity violation in quantum gravity. In particular,
we study the coupling of fermionic degrees of freedom in the presence of
torsion and the physical meaning of the Immirzi parameter from the viewpoint of
effective field theory. We derive the low-energy effective lagrangian which
turns out to in... | 0507253v2 |
2005-10-06 | Casimir energy and a cosmological bounce | We review different computation methods for the renormalised energy momentum
tensor of a quantised scalar field in an Einstein Static Universe. For the
extensively studied conformally coupled case we check their equivalence; for
different couplings we discuss violation of different energy conditions. In
particular, the... | 0510052v1 |
2005-10-17 | Noncommutative geometry, Quantum effects and DBI-scaling in the collapse of D0-D2 bound states | We study fluctuations of time-dependent fuzzy two-sphere solutions of the
non-abelian DBI action of D0-branes, describing a bound state of a spherical
D2-brane with N D0-branes. The quadratic action for small fluctuations is shown
to be identical to that obtained from the dual abelian D2-brane DBI action,
using the non... | 0510144v2 |
2005-10-23 | Time variation of the gravitational coupling constant in all dimensions: Kasner-type cosmological models | We formulate the time variation of the gravitational coupling constant in all
dimensions. We show that the time variation of the gravitational coupling
constant is related to the time variation of the Newton's constant in
three-space dimensions and also is related to the time variation of the volume
of the extra spatia... | 0510197v4 |
2006-02-10 | Tri-linear Couplings in an Heterotic Minimal Supersymmetric Standard Model | We calculate, at the classical level, the superpotential tri-linear couplings
of the only known globally consistent heterotic minimal supersymmetric Standard
Model [ hep-th/0512149 ]. This recently constructed model is based on a
compactification of the E_8 x E_8 heterotic string theory on a Calabi-Yau
threefold with Z... | 0602096v2 |
2006-05-20 | Renormalization and causality violations in classical gravity coupled with quantum matter | I prove that classical gravity coupled with quantized matter can be
renormalized with a finite number of independent couplings, plus field
redefinitions, without introducing higher-derivative kinetic terms in the
gravitational sector, but adding vertices that couple the matter stress-tensor
with the Ricci tensor. The t... | 0605205v2 |
2006-06-01 | Anomaly Cancellation in Supergravity with Fayet-Iliopoulos Couplings | We review and clarify the cancellation conditions for gauge anomalies which
occur when N=1, D=4 supergravity is coupled to a Kahler non-linear sigma-model
with gauged isometries and Fayet-Iliopoulos couplings. For a flat sigma-model
target space and vanishing Fayet-Iliopoulos couplings, consistency requires
just the co... | 0606012v1 |
2006-06-29 | Conformal symmetry of gravity and the cosmological constant problem | In absence of matter Einstein gravity with a cosmological constant $\La$ can
be formulated as a scale-free theory depending only on the dimensionless
coupling constant G \Lambda where G is Newton constant. We derive the conformal
field theory (CFT) and its improved stress-energy tensor that describe the
dynamics of con... | 0606274v2 |
2006-07-11 | Numerical study of curvature perturbations in a brane-world inflation at high-energies | We study the evolution of scalar curvature perturbations in a brane-world
inflation model in a 5D Anti-de Sitter spacetime. The inflaton perturbations
are confined to a 4D brane but they are coupled to the 5D bulk metric
perturbations. We numerically solve full coupled equations for the inflaton
perturbations and the 5... | 0607068v2 |
2006-08-22 | The Gross-Neveu Model from String Theory | We study an intersecting D-brane model which at low energies describes
(1+1)-dimensional chiral fermions localized at defects on a stack of N_c
D4-branes. Fermions at different defects interact via exchange of massless
(4+1)-dimensional fields. At weak coupling this interaction gives rise to the
Gross-Neveu (GN) model ... | 0608149v1 |
2006-11-11 | Renormalizable acausal theories of classical gravity coupled with interacting quantum fields | We prove the renormalizability of various theories of classical gravity
coupled with interacting quantum fields. The models contain vertices with
dimensionality greater than four, a finite number of matter operators and a
finite or reduced number of independent couplings. An interesting class of
models is obtained from... | 0611131v2 |
2006-12-19 | Meson coupling constants at high mass and large N_c | Quark-hadron duality implies that a process described in terms of quark loops
should be the hadronic amplitude when averaged over a sufficient number of
states. Ambiguities associated with the notion of quark hadron duality can be
made arbitrarily small for highly excited mesons at large $N_c$. QCD is
expected to form ... | 0612209v2 |
2007-01-17 | Dependence of SU(N) coupling behavior on the size of extra dimensions | Coupling constants at high energy scales are studied in SU(N) gauge theory
with distinct sizes of extra dimensions. We present the solution of gauge
couplings as functions of the energy in such a way as to track the number of
Kaluza-Klein modes. In a flat extra dimension, it is shown that the gauge
couplings have logar... | 0701159v2 |
1999-10-09 | How to Couple from the Past Using a Read-Once Source of Randomness | We give a new method for generating perfectly random samples from the
stationary distribution of a Markov chain. The method is related to coupling
from the past (CFTP), but only runs the Markov chain forwards in time, and
never restarts it at previous times in the past. The method is also related to
an idea known as PA... | 9910050v1 |
2000-08-22 | Coupling Tensors and Poisson Geometry Near a Single Symplectic Leaf | In the framework of the connection theory, a contravariant analog of the
Sternberg coupling procedure is developed for studying a natural class of
Poisson structures on fiber bundles, called coupling tensors. We show that
every Poisson structure near a closed symplectic leaf can be realized as a
coupling tensor. Our ma... | 0008162v3 |
2004-12-16 | Foliation-coupling Dirac structures | We extend the notion of "coupling with a foliation" from Poisson to Dirac
structures and get the corresponding generalization of the Vorobiev
characterization of coupling Poisson structures. We show that any Dirac
structure is coupling with the fibers of a tubular neighborhood of an embedded
presymplectic leaf, give ne... | 0412318v3 |
2005-11-08 | Metric Construction, Stopping Times and Path Coupling | In this paper we examine the importance of the choice of metric in path
coupling, and the relationship of this to \emph{stopping time analysis}. We
give strong evidence that stopping time analysis is no more powerful than
standard path coupling. In particular, we prove a stronger theorem for path
coupling with stopping... | 0511202v2 |
2002-02-01 | One non-relativistic particle coupled to a photon field | We investigate the ground state energy of an electron coupled to a photon
field. First, we regard the self-energy of a free electron, which we describe
by the Pauli-Fierz Hamiltonian. We show that, in the case of small values of
the coupling constant $\alpha$, the leading order term is represented by
$2\pi^{-1} \alpha ... | 0202001v3 |
2002-09-25 | Exotic Yang-Mills dilaton gauge theories | A exotic class of nonlinear p-form nonabelian gauge theories is studied,
arising from the most general allowed nontrivial deformation of linear abelian
gauge theory for a set of massless 1-form fields and 2-form fields in four
dimensions. These theories combine a Chapline-Manton type coupling of the
1-forms and 2-forms... | 0209052v4 |
2004-11-29 | Precise coupling terms in adiabatic quantum evolution: The generic case | For multi-level time-dependent quantum systems one can construct
superadiabatic representations in which the coupling between separated levels
is exponentially small in the adiabatic limit. Based on results from [BeTe1]
for special Hamiltonians we explicitly determine the asymptotic behavior of the
exponentially small ... | 0411083v1 |
2005-11-06 | Open Subsystems of Conservative Systems | The subject under study is an open subsystem of a larger linear and
conservative system and the way in which it is coupled to the rest of system.
Examples are a model of crystalline solid as a lattice of coupled oscillators
with a finite piece constituting the subsystem, and an open system such as the
Helmholtz resonat... | 0511023v2 |
2000-04-10 | Exact solutions and dynamics of globally coupled phase oscillators | We analyze mean-field models of synchronization of phase oscillators with
singular couplings and subject to external random forces. They are related to
the Kuramoto-Sakaguchi model. Their probability densities satisfy local partial
differential equations similar to the Porous Medium, Burgers and extended
Burgers equati... | 0004016v1 |
2001-04-25 | Anticipated synchronization in coupled chaotic maps with delays | We study the synchronization of two chaotic maps with unidirectional
(master-slave) coupling. Both maps have an intrinsic delay $n_1$, and coupling
acts with a delay $n_2$. Depending on the sign of the difference $n_1-n_2$, the
slave map can synchronize to a future or a past state of the master system. The
stability pr... | 0104061v1 |
2001-07-30 | Periodicity Manifestations in the Non-Locally Coupled Maps | We study how periodicity manifestations recently found in the turbulent
globall coupled maps depend on the global feature of the couplings. We examine
three non-locally coupled map models. In the first two, the all-to-all
interaction is maintained but the coupling decreases with distance in a power
and an exponential l... | 0107068v3 |
2001-10-23 | Plasticity and learning in a network of coupled phase oscillators | A generalized Kuramoto model of coupled phase oscillators with slowly varying
coupling matrix is studied. The dynamics of the coupling coefficients is driven
by the phase difference of pairs of oscillators in such a way that the coupling
strengthens for synchronized oscillators and weakens for non-synchronized
pairs. T... | 0110044v1 |
2002-03-19 | From Coupled Dynamical Systems to Biological Irreversibility | In the first half of the paper, some recent advances in coupled dynamical
systems, in particular, a globally coupled map are surveyed. First, dominance
of Milnor attractors in partially ordered phase is demonstrated. Second,
chaotic itinerancy in high-dimensional dynamical systems is briefly reviewed,
with discussion o... | 0203040v1 |
2002-12-17 | Delay-induced Synchronization Phenomena in an Array of Globally Coupled Logistic Maps | We study the synchronization of a linear array of globally coupled identical
logistic maps. We consider a time-delayed coupling that takes into account the
finite velocity of propagation of the interactions. We find globally
synchronized states in which the elements of the array evolve along a periodic
orbit of the unc... | 0212037v2 |
2003-09-19 | Rotating Spiral Waves with Phase-Randomized Core in Non-locally Coupled Oscillators | Rotating spiral waves with a central core composed of phase-randomized
oscillators can arise in reaction-diffusion systems if some of the chemical
components involved are diffusion-free. This peculiar phenomenon is
demonstrated for a paradigmatic three-component reaction-diffusion model. The
origin of this anomalous sp... | 0309052v1 |
2005-04-23 | Chimera States in a Ring of Nonlocally Coupled Oscillators | Arrays of identical limit-cycle oscillators have been used to model a wide
variety of pattern-forming systems, such as neural networks, convecting fluids,
laser arrays, and coupled biochemical oscillators. These systems are known to
exhibit rich collective behavior, from synchrony and traveling waves to
spatiotemporal ... | 0504046v2 |
2006-03-29 | Scaling behaviour of non-hyperbolic coupled map lattices | Coupled map lattices of non-hyperbolic local maps arise naturally in many
physical situations described by discretised reaction diffusion equations or
discretised scalar field theories. As a prototype for these types of lattice
dynamical systems we study diffusively coupled Tchebyscheff maps of N-th order
which exhibit... | 0603067v2 |
2006-07-11 | Synchronization by dynamical relaying in electronic circuit arrays | We experimentally study the synchronization of two chaotic electronic
circuits whose dynamics is relayed by a third parameter-matched circuit, to
which they are coupled bidirectionally in a linear chain configuration. In a
wide range of operating parameters, this setup leads to synchronization between
the outer circuit... | 0607018v1 |
2006-09-30 | Generalized Chaotic Synchronizationin Coupled Ginzburg-Landau Equations | Generalized synchronization is analyzed in unidirectionally coupled
oscillatory systems exhibiting spatiotemporal chaotic behavior described by
Ginzburg-Landau equations. Several types of coupling betweenthe systems are
analyzed. The largest spatial Lyapunov exponent is proposed as a new
characteristic of the state of ... | 0610001v1 |
2006-12-06 | State Differentiation by Transient Truncation in Coupled Threshold Dynamics | Dynamics with a threshold input--output relation commonly exist in gene,
signal-transduction, and neural networks. Coupled dynamical systems of such
threshold elements are investigated, in an effort to find differentiation of
elements induced by the interaction. Through global diffusive coupling, novel
states are found... | 0612013v1 |
2006-12-23 | Synchronized dynamics of cortical neurons with time-delay feedback | The dynamics of three mutually coupled cortical neurons with time delays in
the coupling are explored numerically and analytically. The neurons are coupled
in a line, with the middle neuron sending a somewhat stronger projection to the
outer neurons than the feedback it receives, to model for instance the relay of
a si... | 0612053v1 |
2007-01-12 | Amplification in the auditory periphery: the effect of coupling tuning mechanisms | A mathematical model describing the coupling between two independent
amplification mechanisms in auditory hair cells is proposed and analyzed. Hair
cells are cells in the inner ear responsible for translating sound-induced
mechanical stimuli into an electrical signal that can then be recorded by the
auditory nerve. In ... | 0701022v1 |
1993-11-11 | Constraints on the $πNN$ Coupling Constant from the $NN$ System | The sensitivity of the deuteron and of $pp$ scattering to the $\pi NN$ and
$\rho NN$ coupling constants is investigated systematically. We find that the
deuteron can be described about equally well with either {\it large $\pi$ and
$\rho$} or {\it small $\pi$ and $\rho$} coupling constants. However, $pp$
scattering clea... | 9311012v1 |
1996-08-08 | Derivation and assessment of strong coupling core-particle model from the Kerman-Klein-Dönau-Frauendorf theory | We review briefly the fundamental equations of a semi-microscopic
core-particle coupling method that makes no reference to an intrinsic system of
coordinates. We then demonstrate how an intrinsic system can be introduced in
the strong coupling limit so as to yield a completely equivalent formulation.
It is emphasized t... | 9608011v1 |
1997-06-23 | Isospin Splitting in the Pion-Nucleon Couplings from QCD Sum Rules | We use QCD sum rules for the three point function of a pseudoscalar and two
nucleonic currents in order to estimate the charge dependence of the pion
nucleon coupling constant coming from isospin violation in the strong
interaction. The effect can be attributed primarily to the difference of the
quark condensates <ubar... | 9706056v1 |
1998-02-19 | A new Perspective on the Scalar meson Puzzle, from Spontaneous Chiral Symmetry Breaking Beyond BCS | We introduce coupled channels of Bethe-Salpeter mesons both in the boundstate
equation for mesons and in the mass gap equation for chiral symmetry.
Consistency is insured by the Ward Identities for axial currents, which
preserve the Goldstone boson nature of the pion and prevents a systematic shift
of the hadron spectr... | 9802058v2 |
1999-06-08 | Chiral Unitary Approach To The N*N*pi, N*N*eta Couplings For The N*(1535) Resonance | Using a chiral unitary model in which the negative parity nucleon resonance
$N^\ast \equiv N^\ast(1535)$ is generated dynamically by means of the Bethe
Salpeter equation with coupled meson baryon channels in the $S = 0$ sector, we
have obtained the $\pi^0 N^\ast N^\ast$ and $\eta N^\ast N^\ast$ couplings. The
$\pi^0 N^... | 9906018v2 |
1999-08-03 | Role of break-up processes in fusion enhancement of drip-line nuclei at energies below the Coulomb barrier | We carry out realistic coupled-channels calculations for
$^{11}$Be + $^{208}$Pb reaction in order to discuss the effects of break-up
of the projectile nucleus on sub-barrier fusion.
We discretize in energy the particle continuum states, which are associated
with the break-up process, and construct the coupling form... | 9908012v1 |
2000-05-17 | Nucleon Resonance Transition Couplings to Vector Mesons | Recent heavy ion experiments indicate modifications of the $\rho-$meson mass
in medium. In the CERES experiments $\rho-$mesons are produced at $\sim$ normal
nuclear matter density, where hadrons are more appropriate constituents than
quarks. A collective "nuclear $\rho$", in which every nucleon is excited to the
N(1520... | 0005049v1 |
2000-09-29 | Quark-Meson Coupling Model for a Nucleon | The quark-meson coupling model for a nucleon is considered. The model
describes a nucleon as an MIT bag, in which quarks are coupled to scalar and
vector mesons. A set of coupled equations for the quark and the meson fields
are obtained and are solved in a self-consistent way. It is shown that the mass
of a nucleon as ... | 0009089v1 |
2000-10-20 | Quark-meson coupling model for a nucleon | We considered the quark-meson coupling model for a nucleon. The model
describes a nucleon as an MIT bag, in which quarks are coupled to the scalar
and the vector mesons. A set of coupled equations for the quark and the meson
fields are obtained and are solved in a self-consistent manner. We show that
the mass of a dres... | 0010067v1 |
2002-02-08 | Fusion of light exotic nuclei at near-barrier energies : effect of inelastic excitation | The effect of inelastic excitation of exotic light projectiles (proton- as
well as neutron-rich) $^{17}$F and $^{11}$Be on fusion with heavy target has
been studied at near-barrier energies. The calculations have been performed in
the coupled channels approach where, in addition to the normal coupling of the
ground sta... | 0202027v1 |
2002-02-08 | Fusion of light proton-rich exotic nuclei at near-barrier energies | We study theoretically fusion of the light proton-rich exotic nuclei $^{17}$F
and $^8$B at near-barrier energies in order to investigate the possible role of
breakup processes on their fusion cross sections. To this end, coupled channel
calculations are performed considering the couplings to the breakup channels of
the... | 0202028v1 |
2002-06-18 | Induced pseudoscalar coupling of the proton weak interaction | The induced pseudoscalar coupling $g_p$ is the least well known of the weak
coupling constants of the proton's charged--current interaction. Its size is
dictated by chiral symmetry arguments, and its measurement represents an
important test of quantum chromodynamics at low energies. During the past
decade a large body ... | 0206039v1 |
2002-09-27 | Lambda Lambda-XiN Coupling Effects in Light Hypernuclei | The significance of $\Lambda\Lambda$-$\Xi$N coupling in double-$\Lambda$
hypernuclei has been studied. The Pauli suppression effect due to this coupling
in $^6_{\Lambda\Lambda}$He has been found to be 0.43 MeV for the coupling
strength of the NSC97e potential. This indicates that the free-space
$\Lambda\Lambda$ interac... | 0209090v1 |
2002-10-31 | Relativistic Mean Field Model with Generalized Derivative Nucleon-Meson Couplings | The quantum hadrodynamics (QHD) model with minimal nucleon-meson couplings is
generalized by introducing couplings of mesons to derivatives of the nucleon
field in the Lagrangian density. This approach allows an effective description
of a state-dependent in-medium interaction in the mean-field approximation.
Various pa... | 0210090v1 |
2003-11-24 | Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment | Properties of hypernuclei $_{\Lambda \Lambda}^5$H and $_{\Lambda \Lambda
}^5$He are studied in a two-channel approach with explicit treatment of
coupling of channels ^3\text{Z}+\Lambda+\Lambda and \alpha+\Xi. Diagonal
\Lambda\Lambda and coupling \Lambda\Lambda-\Xi N interactions are derived
within G-matrix procedure fr... | 0311084v1 |
2004-02-13 | QCD sum rules at finite density in the large-N_c limit: The coupling of the rho-nucleon system to the D_{13}(1520) | QCD sum rules are studied for the vector-isovector current at finite baryon
density in the limit of large number of colors N_c. For the condensate side it
is shown that in this limit the four-quark condensate factorizes also for the
finite density case. At the hadronic side the medium dependence is expressed in
terms o... | 0402048v1 |
2004-06-02 | On the Isovector Channels in Relativistic Point Coupling Models within the Hartree and Hartree-Fock Approximations | We investigate the consequences of Fierz transformations acting upon the
contact interactions for nucleon fields occurring in relativistic point
coupling models in Hartree approximation, which yield the same models but in
Hartree-Fock approximation instead. We find for four-fermion interactions
occurring in two existin... | 0406006v1 |
2004-11-30 | Tensor coupling and pseudospin symmetry in nuclei | In this work we study the contribution of the isoscalar tensor coupling to
the realization of pseudospin symmetry in nuclei. Using realistic values for
the tensor coupling strength, we show that this coupling reduces noticeably the
pseudospin splittings, especially for single-particle levels near the Fermi
surface. By ... | 0411120v2 |
2005-03-29 | Mass and $KΛ$ coupling of $N^*(1535)$ | Using resonance isobar model and effective Lagrangian approach, from recent
BES results on $J/\psi\to\bar pp\eta$ and $\psi\to\bar pK^+\Lambda$, we deduce
the ratio between effective coupling constants of $N^*(1535)$ to $K\Lambda$ and
$p\eta$ to be $R\equiv g_{N^*(1535)K\Lambda}/g_{N^*(1535)p\eta} =1.3\pm 0.3$.
With pr... | 0503069v1 |
2006-02-10 | XCDCC: Core Excitation in the Breakup of Exotic Nuclei | The eXtended Continuum Discretized Coupled Channel (XCDCC) method is
developed to treat reactions where core degrees of freedom play a role. The
projectile is treated as a multi-configuration coupled channels system
generated from a valence particle coupled to a deformed core which is allowed
to excite. The coupled cha... | 0602034v1 |
2006-05-19 | Failure of the Standard Coupled-Channels Method in Describing the Inelastic Reaction Data: On the Use of a New Shape for the Coupling Potential | We present the failure of the standard coupled-channels method in explaining
the inelastic scattering together with other observables such as elastic
scattering, excitation function and fusion data. We use both microscopic
double-folding and phenomenological deep potentials with shallow imaginary
components. We argue t... | 0605045v1 |
2006-09-21 | Covariant response theory beyond RPA and its application | The covariant particle-vibration coupling model within the time blocking
approximation is employed to supplement the Relativistic Random Phase
Approximation (RRPA) with coupling to collective vibrations. The Bethe-Salpeter
equation in the particle-hole channel with an energy dependent residual
particle-hole (p-h) inter... | 0609061v1 |
2007-02-20 | Application of density dependent parametrization models to asymmetric nuclear matter | Density dependent parametrization models of the nucleon-meson effective
couplings, including the isovector scalar \delta-field, are applied to
asymmetric nuclear matter. The nuclear equation of state and the neutron star
properties are studied in an effective Lagrangian density approach, using the
relativistic mean fie... | 0702064v1 |
2007-03-28 | The Friedrichs-Model with fermion-boson couplings | In this work we present an extended version of the Friedrichs Model, which
includes fermion-boson couplings. The set of fermion bound states is coupled to
a boson field with discrete and continuous components. As a result of the
coupling some of the fermion states may become resonant states. This feature
suggests the e... | 0703090v1 |
1998-05-26 | Fronts and interfaces in bistable extended mappings | We study the interfaces' time evolution in one-dimensional bistable extended
dynamical systems with discrete time. The dynamics is governed by the
competition between a local piece-wise affine bistable mapping and any
couplings given by the convolution with a function of bounded variation. We
prove the existence of tra... | 9805006v1 |
1999-11-21 | Coherence Resonance and Noise-Induced Synchronization in Globally Coupled Hodgkin-Huxley Neurons | The coherence resonance (CR) of globally coupled Hodgkin-Huxley neurons is
studied. When the neurons are set in the subthreshold regime near the firing
threshold, the additive noise induces limit cycles. The coherence of the system
is optimized by the noise. A bell-shaped curve is found for the peak height of
power spe... | 9911048v1 |
2000-08-17 | Studies of Coupled Cavity Linac (CCL) Accelerating Structures with 3-D Codes | The cw CCL being designed for the Accelerator Production of Tritium (APT)
project accelerates protons from 96MeV to 211MeV. It consists of 99 segments
each containing up to seven accelerating cavities. Segments are coupled by
intersegment coupling cavities and grouped into supermodules. The design method
needs to addre... | 0008107v2 |
2001-08-30 | Global selection rule in chemical coupling | Coupling and decoupling of chemical reactions are explored through a modified
heat balance equation. Reaction enthalpies are found to play crucial role; the
sign of their product for a pair of consecutive chemical reactions determine
whether they couple or not. The possibility of a coupling-uncoupling transition
for su... | 0108070v1 |
2004-05-31 | Maple procedures for the coupling of angular momenta. VI. LS-jj transformations | Transformation matrices between different coupling schemes are required, if a
reliable classification of the level structure is to be obtained for open-shell
atoms and ions. While, for instance, relativistic computations are
traditionally carried out in jj-coupling, a LSJ coupling notation often occurs
much more approp... | 0405156v1 |
2004-12-20 | Theory of the propagation of coupled waves in arbitrarily-inhomogeneous stratified media | We generalize the invariant imbedding theory of the wave propagation and
derive new invariant imbedding equations for the propagation of arbitrary
number of coupled waves of any kind in arbitrarily-inhomogeneous stratified
media, where the wave equations are effectively one-dimensional. By doing this,
we transform the ... | 0412121v1 |
2006-04-05 | Spurious detection of phase synchronization in coupled nonlinear oscillators | Coupled nonlinear systems under certain conditions exhibit phase
synchronization, which may change for different frequency bands or with
presence of additive system noise. In both cases, Fourier filtering is
traditionally used to preprocess data. We investigate to what extent the phase
synchronization of two coupled R\... | 0604039v1 |
2006-06-17 | Chaotic synchronization in coupled spatially extended beam-plasma systems | The appearance of the chaotic synchronization regimes has been discovered for
the coupled spatially extended beam-plasma Pierce systems. The coupling was
introduced only on the right bound of each subsystem. It has been shown that
with coupling increase the spatially extended beam-plasma systems show the
transition fro... | 0606157v1 |
1997-05-06 | Effective Theories of Coupled Classical and Quantum Variables from Decoherent Histories: A New Approach to the Backreaction Problem | We use the decoherent histories approach to quantum theory to derive the form
of an effective theory describing the coupling of classical and quantum
variables. The derivation is carried out for a system consisting of a large
particle coupled to a small particle with the important additional feature that
the large part... | 9705005v2 |
1998-11-17 | Pulse Sequences for NMR Quantum Computers: How to Manipulate Nuclear Spins While Freezing the Motion of Coupled Neighbours | We show how to divide a coupled multi-spin system into a small subset of
``active'' spins that evolve under chemical shift or scalar coupling operators,
and a larger subset of ``spectator'' spins which are returned to their initial
states, as if their motion had been temporarily frozen. This allows us to
implement basi... | 9811043v1 |
1999-03-30 | Adiabatic population transfer via multiple intermediate states | This paper discusses a generalization of stimulated Raman adiabatic passage
(STIRAP) in which the single intermediate state is replaced by $N$ intermediate
states. Each of these states is connected to the initial state $\state{i}$ with
a coupling proportional to the pump pulse and to the final state $\state{f}$
with a ... | 9903096v1 |
2000-01-11 | Adiabatic Output Coupling of a Bose Gas at Finite Temperatures | We develop a general theory of adiabatic output coupling from trapped atomic
Bose-Einstein Condensates at finite temperatures. For weak coupling, the output
rate from the condensate, and the excited levels in the trap, settles in a time
proportional to the inverse of the spectral width of the coupling to the output
mod... | 0001033v2 |
2002-10-04 | An Analysis of Mutual Communication between Qubits by Capacitive Coupling | A behavior of a two qubit system coupled by the electric capacitance has been
studied quantum mechanically. We found that the interaction is essentially the
same as the one for the dipole-dipole interaction; i.e., qubit-qubit coupling
of the NMR quantum gate. Therefore a quantum gate could be constructed by the
same op... | 0210028v5 |
2003-11-14 | Coupling Efficiencies in Single Photon On-Demand Sources | Many quantum computation and communication schemes require, or would
significantly benefit from, true sources of single photon on-demand (SPOD).
Unfortunately, such sources do not exist. It is becoming increasingly clear
that coupling photons out of a SPOD source will be a limiting factor in many
SPOD implementations. ... | 0311099v2 |
2004-08-26 | Quantum dynamics of a model for two Josephson-coupled Bose--Einstein condensates | In this work we investigate the quantum dynamics of a model for two
single-mode Bose--Einstein condensates which are coupled via Josephson
tunneling. Using direct numerical diagonalisation of the Hamiltonian, we
compute the time evolution of the expectation value for the relative particle
number across a wide range of ... | 0408161v2 |
2004-11-06 | Intrinsic decoherence effects on tripartite GHZ state generation using a trapped ion coupled to an optical cavity | We analyse the effects of intrinsic decoherence on the probability of
generating a tripartite GHZ state using a cool trapped ion coupled to a single
mode of the cavity field and interacting with a resonant laser field. Milburn
equation is solved for this tripartite system to obtain the time evolution of
density matrix ... | 0411045v1 |
2005-01-20 | Entanglement production in Quantized Chaotic Systems | Quantum chaos is a subject whose major goal is to identify and to investigate
different quantum signatures of classical chaos. Here we study entanglement
production in coupled chaotic systems as a possible quantum indicator of
classical chaos. We use coupled kicked tops as a model for our extensive
numerical studies. W... | 0501113v1 |
2005-02-28 | Control of Local Relaxation Behavior in Closed Bipartite Quantum Systems | We investigate the decoherence of a spin 1/2 subsystem weakly coupled to an
environment of many spins 1/2 with and without mutual coupling. The total
system is closed, its state is pure and evolves under Schroedinger dynamics.
Nevertheless, the considered spin typically reaches a quasi-stationary
equilibrium state. Her... | 0502181v2 |
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