publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2007-02-27 | Couplings of N=1 chiral spinor multiplets | We derive the action for chiral spinor multiplets coupled to vector and
scalar multiplets. We give the component form of the action, which contains
gauge invariant mass terms for the antisymmetric tensors in the spinor
superfield and additional Green-Schwarz couplings to vector fields. We observe
that supersymmetry pro... | 0702211v2 |
2004-08-31 | Topological complexity of the relative closure of a semi-Pfaffian couple | Gabrielov introduced the notion of relative closure of a Pfaffian couple as
an alternative construction of the o-minimal structure generated by
Khovanskii's Pfaffian functions. In this paper, use the notion of format (or
complexity) of a Pfaffian couple to derive explicit upper-bounds for the
homology of its relative c... | 0409002v3 |
2005-05-11 | Coupled Painlevé II Systems in Dimension 4 and the systems of type ${A_4}^{(1)}$ | We find and study coupled Painlev\'e II systems in dimension 4, which can be
obtained by a degeneration from the systems of type ${A_4}^{(1)}$. We compare
these systems with other types of coupled Painlev\'e II systems from the
viewpoint of the local index. We also give the phase spaces for these systems. | 0505203v2 |
2005-07-07 | Mirror symmetry, Kobayashi's duality, and Saito's duality | M. Kobayashi introduced a notion of duality of weight systems. We tone this
notion slightly down to a notion called coupling. We show that coupling induces
a relation between the reduced zeta functions of the monodromy operators of the
corresponding singularities generalizing an observation of K. Saito concerning
Arnol... | 0507134v1 |
2005-09-30 | Counting carefree couples | A pair of natural numbers (a,b) such that a is both squarefree and coprime to
b is called a carefree couple.
A result conjectured by Manfred Schroeder (in his book `Number theory in
science and communication') on carefree couples and a variant of it are
established using standard arguments from elementary analytic nu... | 0510003v2 |
2006-05-10 | Regularity of coupled two-dimensional nonlinear Fokker-Planck and Navier-Stokes systems | We consider systems of particles coupled with fluids. The particles are
described by the evolution of their density, and the fluid is described by the
Navier-Stokes equations. The particles add stress to the fluid and the fluid
carries and deforms the particles. Because the particles perform rapid random
motion, we ass... | 0605245v1 |
2006-05-18 | Phase transitions in a piecewise expanding coupled map lattice with linear nearest neighbour coupling | We construct a mixing continuous piecewise linear map on [-1,1] with the
property that a two-dimensional lattice made of these maps with a linear north
and east nearest neighbour coupling admits a phase transition. We also provide
a modification of this construction where the local map is an expanding
analytic circle m... | 0605501v1 |
1999-06-29 | Difference in the number of operators between coupled and uncoupled basis for the general SU(n) Lie algebra | For the cases of irreducible representation, the complete set of operators
necessary to specify uniquely the states. There are two ways of representing
the state, using uncoupled and coupled basis. Here we discuss, how the number
of operators for the cases of coupled and uncoupled basis changes as well as
their differe... | 9906025v1 |
2001-12-06 | Enhanced Binding in non-relativistic QED | We consider a spinless particle coupled to a photon field and prove that even
if the Schr\"odinger operator $p^2 + V$ does not have eigenvalues the system
can have a ground state. We describe the coupling by means of the Pauli-Fierz
Hamiltonian and our result holds in the case where the coupling constant
$\alpha$ is sm... | 0112010v2 |
2002-04-27 | Increase of the binding energy of an electron by coupling to a photon field | We look at an electron in the field of an arbitrary external potential $V$,
such that the Schr\"odinger operator $p^2 + V$ has at least one eigenvalue, and
show that by coupling to a quantized radiation field the binding energy
increases, at least for small enough values of the coupling constant $\alpha$.
Moreover, we ... | 0204052v1 |
2003-03-03 | Spectra of soft ring graphs | We discuss of a ring-shaped soft quantum wire modeled by $\delta$ interaction
supported by the ring of a generally nonconstant coupling strength. We derive
condition which determines the discrete spectrum of such systems, and analyze
the dependence of eigenvalues and eigenfunctions on the coupling and ring
geometry. In... | 0303006v1 |
2003-09-05 | Janossy Densities of Coupled Random Matrices | We explicitly calculate Janossy densities for a special class of finite
determinantal point processes with several types of particles introduced by
Pr\"ahofer and Spohn and, in the full generality, by Johansson in connection
with the analysis of polynuclear growth models. The results of our paper
generalize the theorem... | 0309019v4 |
2003-12-10 | Analyticity of the SRB measure of a lattice of coupled Anosov diffeomorphisms of the torus | We consider the "thermodynamic limit"of a d-dimensional lattice of hyperbolic
dynamical systems on the 2-torus, interacting via weak and nearest neighbor
coupling. We prove that the SRB measure is analytic in the strength of the
coupling. The proof is based on symbolic dynamics techniques that allow us to
map the SRB m... | 0312032v1 |
2004-04-07 | Precise coupling terms in adiabatic quantum evolution | It is known that 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. For a family of
two-state systems with real-symmetric Hamiltonian we construct such a
superadiabatic representati... | 0404021v1 |
2004-11-05 | Coupling of eigenvalues of complex matrices at diabolic and exceptional points | The paper presents a general theory of coupling of eigenvalues of complex
matrices of arbitrary dimension depending on real parameters. The cases of weak
and strong coupling are distinguished and their geometric interpretation in two
and three-dimensional spaces is given. General asymptotic formulae for
eigenvalue surf... | 0411024v4 |
2005-08-23 | Approximations of permutation-symmetric vertex couplings in quantum graphs | We consider boundary conditions at the vertex of a star graph which make
Schroedinger operators on the graph self-adjoint, in particular, the
two-parameter family of such conditions invariant with respect to permutations
of graph edges. It is proved that the corresponding operators can be
approximated in the norm-resol... | 0508046v1 |
1996-09-23 | Substrate-adsorbate coupling in CO-adsorbed copper | The vibrational properties of carbon monoxide adsorbed to the copper (100)
surface are explored within density functional theory. Atoms of the substrate
and adsorbate are treated on an equal footing in order to examine the effect of
substrate--adsorbate coupling. This coupling is found to have a significant
effect on t... | 9609004v1 |
2000-02-14 | Phase synchronization in coupled nonidentical excitable systems and array enhanced coherence resonance | We study the dynamics of a lattice of coupled nonidentical Fitz Hugh-Nagumo
system subject to independent external noise. It is shown that these stochastic
oscillators can lead to global synchronization behavior {\sl without an
external signal}. With the increase of the noise intensity, the system exhibits
coherence re... | 0002019v1 |
2000-02-22 | Stability of Oscillating Hexagons in Rotating Convection | Breaking the chiral symmetry, rotation induces a secondary Hopf bifurcation
in weakly nonlinear hexagon patterns which gives rise to oscillating hexagons.
We study the stability of the oscillating hexagons using three coupled
Ginzburg-Landau equations. Close to the bifurcation point we derive reduced
equations for the ... | 0002038v1 |
2000-02-29 | Localized structures in coupled Ginzburg-Landau equations | Coupled Complex Ginzburg-Landau equations describe generic features of the
dynamics of coupled fields when they are close to a Hopf bifurcation leading to
nonlinear oscillations. We study numerically this set of equations and find,
within a particular range of parameters, the presence of uniformly propagating
localized... | 0002053v1 |
2000-05-26 | From synchronization to multistability in two coupled quadratic maps | The phenomenology of a system of two coupled quadratic maps is studied both
analytically and numerically. Conditions for synchronization are given and the
bifurcations of periodic orbits from this regime are identified. In addition,
we show that an arbitrarily large number of distinct stable periodic orbits may
be obta... | 0005053v1 |
2000-06-23 | Periodicity Manifestations in the Turbulent Regime of Globally Coupled Map Lattice | We revisit the globally coupled map lattice (GCML). We show that in the so
called turbulent regime various periodic cluster attractor states are formed
even though the coupling between the maps are very small relative to the
non-linearity in the element maps.
Most outstanding is a maximally symmetric three cluster at... | 0006038v1 |
2000-07-20 | Directional coupling of optical signals by odd dark beams with mixed phase dislocations | Numerical simulations on the evolution of step-screw and edge-screw optical
phase dislocations in bulk saturable self-defocusing nonlinear media are
presented, with emphasis on their ability to induce steering waveguides for
signal beams (pulses). Two schemes for directional coupling of such signals,
both ensuring reas... | 0007026v1 |
2002-01-05 | Modeling of Spiking-Bursting Neural Behavior Using Two-Dimensional Map | A simple model that replicates the dynamics of spiking and spiking-bursting
activity of real biological neurons is proposed. The model is a two-dimensional
map which contains one fast and one slow variable. The mechanisms behind
generation of spikes, bursts of spikes, and restructuring of the map behavior
are explained... | 0201006v1 |
2002-01-07 | Coupling the Sine-Gordon Field Theory to a Mechanical System at the Boundary | We describe an integrable system consisting of the sine-Gordon field,
restricted to the half line, and coupled to a non-linear oscillator at the
boundary. By extension of the coupling constant to imaginary values we also
outline the equivalent system for the sinh-Gordon field. We show how Sklyanin's
formalism can be ap... | 0201007v1 |
2002-01-22 | Coupled Map Networks as Communication Schemes | Networks of chaotic coupled maps are considered as string and language
generators. It is shown that such networks can be used as encrypting systems
where the ciphertext contains information about the evolution of the network
and also about the way to select the plaintext symbols from the string
associated to the networ... | 0201042v1 |
2002-04-10 | Magic Number 7 +- 2 in Globally Coupled Dynamical Systems? | The prevalence of Milnor attractors has recently been reported in a class of
high-dimensional dynamical systems. We study how this prevalence depends on the
number of degrees of freedom by using a globally coupled map and show that the
basin fraction of Milnor attractors increases drastically around 5-10 degrees
of fre... | 0204013v1 |
2002-04-11 | New Darboux Transformation for Hirota-Satsuma coupled KdV System | A new Darboux transformation is presented for the Hirota-Satsuma coupled KdV
system. It is shown that this Darboux transformation can be constructed by
means of two methods: Painlev\'{e} analysis and reduction of a binary Darboux
transformation. By iteration of the Darboux transformation, the Grammian type
solutions ar... | 0204018v1 |
2002-05-09 | The Onset of Synchronization in Systems of Globally Coupled Chaotic and Periodic Oscillators | A general stability analysis is presented for the determination of the
transition from incoherent to coherent behavior in an ensemble of globally
coupled, heterogeneous, continuous-time dynamical systems. The formalism allows
for the simultaneous presence of ensemble members exhibiting chaotic and
periodic behavior, an... | 0205018v1 |
2002-08-21 | Scaling at the onset of chaos in a network of logistic maps with two types of global coupling | We study a network of logistic maps with two types of global coupling,
inertial and dissipative. Features of the clusterization process are revealed
and compared, which are associated with presence of each type of couplings. For
the parameter region near the onset of chaos we outline scaling properties in
dynamical beh... | 0208026v1 |
2003-03-16 | Generalized Turing Patterns and Their Selective Realization in Spatiotemporal Systems | We consider the pattern formation problem in coupled identical systems after
the global synchronized state becomes unstable. Based on analytical results
relating the coupling strengths and the instability of each spatial mode
(pattern) we show that these spatial patterns can be selectively realized by
varying the coupl... | 0303030v1 |
2003-04-11 | On nonlocally coupled complex Ginzburg-Landau equation | A Ginzburg-Landau type equation with nonlocal coupling is derived
systematically as a reduced form of a universal class of reaction-diffusion
systems near the Hopf bifurcation point and in the presence of another small
parameter. The reaction-diffusion systems to be reduced are such that the
chemical components constit... | 0304017v1 |
2003-06-11 | Irreversible quantum graphs | Irreversibility is introduced to quantum graphs by coupling the graphs to a
bath of harmonic oscillators. The interaction which is linear in the harmonic
oscillator amplitudes is localized at the vertices. It is shown that for
sufficiently strong coupling, the spectrum of the system admits a new continuum
mode which ex... | 0306017v1 |
2003-07-02 | Energy Trapping in Loaded String Models with Long- and Short-Range Couplings | This note illustrates the possibility in simple loaded string models of
trapping most of the system energy in a single degree of freedom for very long
times, demonstrating in particular that the robustness of the trapping is
enhanced by increasing the `connectance' of the system, i.e., the extent to
which many degrees ... | 0307004v1 |
2003-10-28 | Measurement of synchronization properties in systems with different excitation levels | We devised a measure based on the distributions of relative event timings of
two coupled units. The measure dynamically evaluates temporal interdependencies
between the two coupled units. Using this we show that even in the event of
symmetrical coupling, non-identical units (having different control parameters)
have sm... | 0310042v1 |
2004-05-21 | How Crucial is Small World Connectivity for Dynamics? | We study the dynamical behaviour of the collective field of chaotic systems
on small world lattices. Coupled neuronal systems as well as coupled logistic
maps are investigated. We observe that significant changes in dynamical
properties occur only at a reasonably high strength of nonlocal coupling.
Further, spectral fe... | 0405049v1 |
2004-06-14 | Nonlinear absorption in discrete systems | In the context of nonlinear scattering, a continuous wave incident onto a
nonlinear discrete molecular chain of coupled oscillators can be partially
absorbed as a result of a 3-wave resonant interaction that couples two HF-waves
of frequencies close to the edge of the Brillouin zone. Hence both nonlinearity
and discret... | 0406024v1 |
2004-07-06 | Effect of the Introduction of Impurities on the Stability Properties of Multibreathers at Low Coupling | sing a theorem dubbed the {\em Multibreather Stabiliy Theorem} [Physica D 180
(2003) 235-255] we have obtained the stability properties of multibreathers in
systems of coupled oscillators with on-site potentials, with an inhomogeneity.
Analytical results are obtained for 2-site, 3-site breathers, multibreathers,
phonob... | 0407009v1 |
2004-07-07 | Stability analysis of coupled map lattices at locally unstable fixed points | Numerical simulations of coupled map lattices (CMLs) and other complex model
systems show an enormous phenomenological variety that is difficult to classify
and understand. It is therefore desirable to establish analytical tools for
exploring fundamental features of CMLs, such as their stability properties.
Since CMLs ... | 0407014v2 |
2004-10-19 | Emergence of chaotic attractor and anti-synchronization for two coupled monostable neurons | The dynamics of two coupled piece-wise linear one-dimensional monostable maps
is investigated. The single map is associated with Poincare section of the
FitzHugh-Nagumo neuron model. It is found that a diffusive coupling leads to
the appearance of chaotic attractor. The attractor exists in an invariant
region of phase ... | 0410032v1 |
2004-11-09 | Coupled-mode theory for spatial gap solitons in optically-induced lattices | We develop a coupled-mode theory for spatial gap solitons in the
one-dimensional photonic lattices induced by interfering optical beams in a
nonlinear photorefractive crystal. We derive a novel system of coupled-mode
equations for two counter-propagating probe waves, and find its analytical
solutions for stationary gap... | 0411021v1 |
2005-02-09 | Birhythmicity, Synchronization, and Turbulence in an Oscillatory System with Nonlocal Inertial Coupling | We consider a model where a population of diffusively coupled limit-cycle
oscillators, described by the complex Ginzburg-Landau equation, interacts
nonlocally via an inertial field. For sufficiently high intensity of nonlocal
inertial coupling, the system exhibits birhythmicity with two oscillation modes
at largely dif... | 0502015v1 |
2005-04-23 | An approach to chaotic synchronization | This paper deals with the chaotic oscillator synchronization. A new approach
to the synchronization of chaotic oscillators has been proposed. This approach
is based on the analysis of different time scales in the time series generated
by the coupled chaotic oscillators. It has been shown that complete
synchronization, ... | 0504045v1 |
2005-04-24 | Intermittent generalized synchronization in unidirectionally coupled chaotic oscillators | A new behavior type of unidirectionally coupled chaotic oscillators near the
generalized synchronization transition has been detected. It has been shown
that the generalized synchronization appearance is preceded by the intermitted
behavior: close to threshold parameter value the coupled chaotic systems
demonstrate the... | 0504048v1 |
2005-05-13 | Independent Component Analysis of Spatiotemporal Chaos | Two types of spatiotemporal chaos exhibited by ensembles of coupled nonlinear
oscillators are analyzed using independent component analysis (ICA). For
diffusively coupled complex Ginzburg-Landau oscillators that exhibit smooth
amplitude patterns, ICA extracts localized one-humped basis vectors that
reflect the characte... | 0505036v1 |
2005-06-17 | Instabilities of multi-hump vector solitons in coupled nonlinear Schroedinger equations | Spectral stability of multi-hump vector solitons in the Hamiltonian system of
coupled nonlinear Schr\"{o}dinger (NLS) equations is investigated both
analytically and numerically. Using the closure theorem for the negative index
of the linearized Hamiltonian, we classify all possible bifurcations of
unstable eigenvalues... | 0506034v1 |
2005-07-16 | Generalized synchronization in coupled Ginzburg-Landau equations and mechanisms of its arising | Generalized chaotic synchronization regime is observed in the
unidirectionally coupled one-dimensional Ginzburg-Landau equations. The
mechanism resulting in the generalized synchronization regime arising in the
coupled spatially extended chaotic systems demonstrating spatiotemporal chaotic
oscillations has been describ... | 0507035v2 |
2005-08-22 | Coupled KdV equations derived from atmospherical dynamics | Some types of coupled Korteweg de-Vries (KdV) equations are derived from an
atmospheric dynamical system. In the derivation procedure, an unreasonable
$y$-average trick (which is usually adopted in literature) is removed. The
derived models are classified via Painlev\'e test. Three types of
$\tau$-function solutions an... | 0508029v1 |
2005-09-06 | On possibility of realization of the phenomena of complex analytic dynamics in physical systems. Novel mechanism of the synchronization loss in coupled period-doubling systems | The possibility of realization of the phenomena of complex analytic dynamics
for the realistic physical models are investigated. Observation of the
Mandelbrot and Julia sets in the parameter and phase spaces both for the
discrete maps and non-autonomous continuous systems is carried out. For these
purposes, the method,... | 0509012v1 |
2005-09-07 | Nonsingular positon and complexiton solutions for the coupled KdV system | Taking the coupled KdV system as a simple example, analytical and nonsingular
complexiton solutions are firstly discovered in this letter for integrable
systems. Additionally, the analytical and nonsingular positon-negaton
interaction solutions are also firstly found for S-integrable model. The new
analytical positon, ... | 0509018v1 |
2005-11-16 | Low-dimensional chaos in populations of strongly-coupled noisy maps | We characterize the macroscopic attractor of infinite populations of noisy
maps subjected to global and strong coupling by using an expansion in order
parameters. We show that for any noise amplitude there exists a large region of
strong coupling where the macroscopic dynamics exhibits low-dimensional chaos
embedded in... | 0511031v1 |
2006-01-31 | Duration of the Process of Complete Synchronizationof Two Coupled Identical Chaotic Systems | We consider the time required for complete synchronization of two identical
one-way coupled vander Pol-Duffing oscillators occurring in the regime of
dynamic chaos. The influence of the initial phase differ-ence between
oscillators on the duration of the process of complete synchronization has been
studied. At a fixedp... | 0601073v1 |
2006-03-08 | A geometric framework for phase synchronization in coupled noisy nonlinear systems | A geometric approach is introduced for understanding the phenomenon of phase
synchronization in coupled nonlinear systems in the presence of additive noise.
We show that the emergence of cooperative behaviour through a change of
stability via a Hopf bifurcation entails the spontaneous appearance of a gauge
structure in... | 0603015v1 |
2006-05-10 | Synchronisation schemes for two dimensional discrete systems | In this work we consider two models of two dimensional discrete systems
subjected to three different types of coupling and analyse systematically the
performance of each in realising synchronised states.We find that linear
coupling effectively introduce control of chaos along with
synchronisation,while synchronised cha... | 0605022v1 |
2006-06-14 | Strength distributions and symmetry breaking in coupled microwave billiards | Flat microwave cavities can be used to experimentally simulate quantum
mechanical systems. By coupling two such cavities, we study the equivalent to
the symmetry breaking in quantum mechanics. As the coupling is tunable, we can
measure resonance strength distributions as a function of the symmetry
breaking. We analyze ... | 0606037v1 |
2006-07-22 | Simultaneous and Sequential Synchronisation in Arrays | We discuss the possibility of simultaneous and sequential synchronisation in
vertical and horizontal arrays of unidirectionally coupled discrete systems.
This is realized for the specific case of two dimensional Gumowski-Mira maps.
The synchronised state can be periodic,thereby bringing in control of chaos, or
chaotic ... | 0607049v1 |
2007-03-07 | Sublattice synchronization of chaotic networks with delayed couplings | Synchronization of chaotic units coupled by their time delayed variables are
investigated analytically. A new type of cooperative behavior is found:
sublattice synchronization. Although the units of one sublattice are not
directly coupled to each other, they completely synchronize without time delay.
The chaotic trajec... | 0703009v1 |
2007-03-09 | Chimera Ising Walls in Forced Nonlocally Coupled Oscillators | Nonlocally coupled oscillator systems can exhibit an exotic spatiotemporal
structure called chimera, where the system splits into two groups of
oscillators with sharp boundaries, one of which is phase-locked and the other
is phase-randomized. Two examples of the chimera states are known: the first
one appears in a ring... | 0703015v1 |
1995-11-03 | Bounds on new Majoron models from the Heidelberg-Moscow-Experiment | In recent years several new Majoron models were invented to avoid
shortcomings of the classical models while leading to observable decay rates in
double beta experiments. We give the first experimental half life bounds on
double beta decays with new Majoron emission and derive bounds on the effective
neutrino--Majoron ... | 9511001v1 |
1992-11-11 | On the pion-nucleon coupling constant | In view of persisting misunderstanding about the determination of the
pion-nucleon coupling constants in the Nijmegen multienergy partial-wave
analyses of pp, np, and pbar-p scattering data, we present additional
information which may clarify several points of discussion. We comment on
several recent papers addressing ... | 9211007v1 |
1993-12-22 | Theory of Coupled Pion--Trinucleon Systems | We derive the dynamical equations which consistently couple the four--body
($\pi$NNN) system to the underlying three--nucleon system. Our treatment can be
considered the proper generalization of the Afnan--Blankleider equations for
the coupled NN--$\pi$NN system. The resulting connected--kernel equation
resembles in st... | 9312016v1 |
1994-08-16 | Limits on the Domain of Coupling Constants for Binding N-Body Systems with No Bound Subsystems | We study the domain of coupling constants for which a 3-body or 4-body system
is bound while none of its subsystems is bound. Limits on the size of the
domain are derived from a variant of the Hall--Post inequalities which relate
$N$-body to $(N-1)$-body energies at given coupling. Possible applications to
halo nuclei ... | 9408017v1 |
1995-06-08 | Extraction of the $πNN$ coupling constant from NN scattering data | We reexamine Chew's method for extracting the $\pi NN$ coupling constant from
np differential cross section measurements. Values for this coupling are
extracted below 350 MeV, in the potential model region, and up to 1 GeV. The
analyses to 1~GeV have utilized 55 data sets. We compare these results to those
obtained via... | 9506005v1 |
1995-12-06 | QCD Scales in Finite Nuclei | The role of QCD scales and chiral symmetry in finite nuclei is examined. The
Dirac-Hartree mean-field coupling constants of Nikolaus, Hoch, and Madland
(NHM) are scaled in accordance with the QCD-based prescription of Manohar and
Georgi. Whereas the nine empirically-based coupling constants of NHM span
thirteen orders ... | 9512011v1 |
1996-02-02 | Derivative-Coupling Models and the Nuclear-Matter Equation of State | The equation of state of saturated nuclear matter is derived using two
different derivative-coupling Lagrangians. We show that both descriptions are
equivalent and can be obtained from the sigma-omega model through an
appropriate rescaling of the coupling constants. We introduce generalized forms
of this rescaling to s... | 9602004v1 |
1996-02-09 | Collective Coordinates and the Absence of Yukawa Coupling in the Classical Skyrme Model | In systems with constraints, physical states must be annihilated by the
constraints. We make use of this rule to construct physical asymptotic states
in the Skyrme model. The standard derivation of the Born terms with asymptotic
physical states shows that there is no Yukawa coupling for the Skyrmion. We
propose a remed... | 9602014v1 |
1997-03-12 | f [N pi N]: from quarks to the pion derivative coupling | We study the N pi N coupling, in the framework of a QCD-inspired confining
Nambu-Jona-Lasinio model. A simple relativistic confining and instantaneous
quark model is reviewed. The Salpeter equation for the nucleon and the boosted
pion is solved. The f [n pi n] and f[n pi Delta] couplings are calculated and
they turn ou... | 9703027v1 |
1997-12-10 | Translationally-invariant coupled-cluster method for finite systems | The translational invariant formulation of the coupled-cluster method is
presented here at the complete SUB(2) level for a system of nucleons treated as
bosons. The correlation amplitudes are solution of a non-linear coupled system
of equations. These equations have been solved for light and medium systems,
considering... | 9712038v1 |
1998-04-01 | $νd \to μ^- Δ^{++} n$ Reaction and Axial Vector $N-Δ$ Coupling | The reaction $\nu d \to \mu^- \Delta^{++} n$ is studied in the region of low
$q^2$ to investigate the effect of deuteron structure and width of the $\Delta$
resonance on the differential cross section. The results are used to extract
the axial vector $N-\Delta$ coupling $C^{A}_5$ from the experimental data on
this reac... | 9804007v1 |
1998-05-04 | Axial Vector Coupling Constant in Chiral Colour Dielectric Model | The axial vector coupling constants of the $\beta$ decay processes of neutron
and hyperon are calculated in SU(3) chiral colour dielectric model (CCDM).
Using these axial coupling constants of neutron and hyperon, in CCDM we
calculate the integrals of the spin dependent structure functions for proton
and neutron. Our r... | 9805005v1 |
1998-05-07 | Quark-meson coupling model with constituent quarks: Exchange and pionic effects | The binding energy of nuclear matter including exchange and pionic effects is
calculated in a quark-meson coupling model with massive constituent quarks. As
in the case with elementary nucleons in QHD, exchange effects are repulsive.
However, the coupling of the mesons directly to the quarks in the nucleons
introduces ... | 9805019v1 |
1998-08-11 | Inside Mesons: Coupling Constants and Form Factors | We illustrate the progress of covariant QCD phenomenology for the description
of meson coupling constants and form factors. As examples, we discuss the
$\rho\pi\pi$ and $\gamma \pi\rho$ interactions, the $\rho$ contribution to the
pion charge radius, and the $\rho NN$ and $\omega NN$ vector and tensor
coupling constant... | 9808029v1 |
1998-11-24 | The $K^\ast Kπ$ and $ρππ$ couplings in QCD | The light cone QCD sum rules are derived for the $K^\ast K\pi$ coupling
$g_{K^\ast K\pi} $ and the $\rho\pi\pi$ coupling $g_{\rho\pi\pi}$. The
contribution from the excited states and the continuum is subtracted cleanly
through the double Borel transform with respect to the two external momenta,
$p_1^2$, $p_2^2=(p-q)^2... | 9811086v1 |
1999-05-06 | The $ΛΛ-ΞN$ Coupling and the Binding Energy of $_{ΛΛ}^{6}}$He | To understand the difference between the value of the nn and Lambda-Lambda
two-body matrix elements, we examine the role of the coupling between the
Lambda-Lambda and Xi-N channels, first within the framework of SU(3), and
second in the numerical results for the binding energy of Lambda-Lambda 6He. We
find that it is e... | 9905014v1 |
1999-08-18 | Sensitivity to the pion-nucleon coupling constant in partial-wave analyses of elastic pi-N and NN scattering and pion photoproduction | We summarize results obtained in our studies of the pion-nucleon coupling
constant. Several different techniques have been applied to pi-N and NN elastic
scattering data, and the existing database for single-pion photoproduction. The
most reliable determination comes from pi-N elastic scattering. The sensitivity
in thi... | 9908057v1 |
1999-10-19 | Nuclear Matter with Quark-Meson Coupling II: Modeling a Soliton Liquid | We study in further detail a nontopological soliton model with coupling
between quarks and mesons selected as promising in the previous work. Here we
go beyond the Wigner-Seitz approximation by introducing the disorder necessary
to reproduce the liquid state. We study nuclear matter, with particular
interest in the tra... | 9910051v1 |
1999-10-20 | Color superconductivity in weak coupling | We derive perturbatively the gap equations for a color-superconducting
condensate with total spin J=0 in dense QCD. At zero temperature, we confirm
the results of Son for the dependence of the condensate on the coupling
constant, and compute the prefactor to leading logarithmic accuracy. At nonzero
temperature, we find... | 9910056v1 |
1999-12-22 | Statistical aspects of nuclear coupling to continuum | Various global characteristics of the coupling between the bound and
scattering states are explicitly studied based on realistic Shell Model
Embedded in the Continuum. In particular, such characteristics are related to
those of the scattering ensemble. It is found that in the region of higher
density of states the coup... | 9912055v1 |
2000-08-28 | Supersymmetric Transformations in Coupled-Channel Systems | A transformation of supersymmetric quantum mechanics for N coupled channels
is presented, which allows the introduction of up to N degenerate bound states
without altering the remaining spectrum of the Hamiltonian. Phase equivalence
of the Hamiltonian can be restored by two successive supersymmetric
transformations at ... | 0008054v1 |
2000-11-30 | Parity-Violating Pion-Nucleon Coupling h_{πNN}^{(1)} from π^+ Electroproton Production Near the Threshold | We study the possibility of measuring parity-violating pion-nucleon coupling
h_{\pi NN}^{(1)} from \pi^+ electroproton production in the threshold region.
We calculate the electron-helicity asymmetry in terms of h_{\pi NN}^{(1)} and
the Z-boson exchange between the electron and proton in leading-order
heavy-baryon chir... | 0011100v1 |
2001-02-13 | Propagation of mesons in asymmetric nuclear matter in a density dependent coupling model | We study the propagation of the light mesons sigma, omega, rho, and a0(980)
in dense hadronic matter in an extended derivative scalar coupling model.
Within the scheme proposed it is possible to unambiguously define effective
density-dependent couplings at the Lagrangian level. We first apply the model
to study asymmet... | 0102029v1 |
2001-03-04 | Quark mean field model with density dependent couplings for finite nuclei | The quark mean field model, which describes the nucleon using the constituent
quark model, is applied to investigate the properties of finite nuclei. The
couplings of the scalar and vector mesons with quarks are made density
dependent through direct coupling to the scalar field so as to reproduce the
relativistic Bruec... | 0103008v1 |
2001-03-13 | The coupling constants g_{ρπγ} and g_{ωπγ} as derived from QCD sum rules} | We employ QCD sum rules to calculate the coupling constants
g$_{\rho\pi\gamma}$ and g$_{\omega\pi\gamma}$ by studying the three point
${\rho\pi\gamma}$- and ${\omega\pi\gamma}$-correlation functions. Our results
for the decay widths $\Gamma(\rho^0\to \pi^0\gamma)$ and $\Gamma(\omega\to
\pi^0\gamma)$ calculated using th... | 0103033v1 |
2001-05-07 | Effective hadron masses and couplings in nuclear matter and incompressibility | The role of effective hadron masses and effective couplings in nuclear matter
is studied using a generalized effective Lagrangian for sigma-omega model. A
simple relation among the effective masses, the effective couplings and the
incompressibility K is derived. Using the relation, it is found that the
effective repuls... | 0105020v2 |
2001-09-19 | Effect of particle-phonon coupling on pairing correlations in nuclei | The influence of particle-phonon coupling on pairing correlations in nuclei
is studied by solving the Dyson equation including the anomalous (pairing)
Green function. We develop the formalism for solving the equation with the
minimum of approximations. The solution of the Dyson equation is compared with
the diagonaliza... | 0109056v1 |
2001-11-29 | Self-consistent quantum effects in the quark meson coupling model | We derive the equation of state of nuclear matter including vacuum
polarization effects arising from the nucleons and the sigma mesons in the
quark-meson coupling model which incorporates explicitly quark degrees of
freedom with quark coupled to the scalar and vector mesons. This leads to a
softer equation of state for... | 0111085v1 |
2002-05-08 | Calculation of strongly-coupled rotational bands in terms of the tilted axis cranking model | Recently observed strongly-coupled rotational bands associated with the $\nu
[505]{11/2}^-$ quasiparticle state are studied by means of a microscopic tilted
axis cranking (TAC) model. The results of calculation for the routhians and the
$B(M1)/B(E2)$ ratios are investigated in the light of other existing models,
i.e. t... | 0205023v1 |
2002-08-19 | Microscopic $NN\to NN^{\ast}(1440)$ transition potential: Determination of $πNN^{\ast}(1440)$ and $σNN^{\ast}(1440) $ coupling constants | A $NN\to NN^{\ast}(1440)$ transition potential, based on an effective
quark-quark interaction and a constituent quark cluster model for baryons, is
derived in the Born-Oppenheimer approach. The potential shows significant
differences with respect to those obtained by a direct scaling of the
nucleon-nucleon interaction.... | 0208033v1 |
2002-08-26 | Coupling of giant resonances to soft E1 and E2 modes in B-8 | The dynamic coupling between giant resonance states and "soft", low-energy
excitation, modes in weakly-bound nuclei is investigated. A coupled-channels
calculation is reported for the reaction 8B + Pb --> p + 7Be + Pb at 83
MeV/nucleon. It is shown that the low-energy response is only marginally
modified by transitions... | 0208054v1 |
2002-10-16 | Nuclear and Neutron Star Radii | We investigate the correlation between nuclear neutron radii and the radius
of neutron stars. We use a well-established hadronic SU(3) model based on
chiral symmetry that naturally includes non-linear vector meson and scalar
meson - vector meson couplings. The relative strengths of the couplings modify
the nuclear isos... | 0210053v1 |
2002-11-12 | Effect of tensor couplings in a relativistic Hartree approach for finite nuclei | The relativistic Hartree approach describing the bound states of both
nucleons and anti-nucleons in finite nuclei has been extended to include tensor
couplings for the $\omega$- and $\rho$-meson. After readjusting the parameters
of the model to the properties of spherical nuclei, the effect of
tensor-coupling terms ris... | 0211034v1 |
2003-04-14 | Fusion and Breakup of Halo Nuclei | We discuss the effect of the coupling to the break-up channel on the total
fusion involving a halo nucleus with a heavy target. We show that there is a
competition between the hindrance arising from this coupling, mostly at above
barrier energies, and the enhancement which ensues at sub-barrier energies
owing to the st... | 0304043v1 |
2003-06-13 | Warm asymmetric matter in the Quark Meson Coupling Model | In this work we study the warm equation of state of asymmetric nuclear matter
in the quark meson coupling model which incorporates explicitly quark degrees
of freedom, with quarks coupled to scalar, vector and isovector mesons.
Mechanical and chemical instabilities are discussed as a function of density
and isospin asy... | 0306045v1 |
2003-12-25 | Stellar matter in the Quark-Meson-Coupling Model with neutrino trapping | The properties of hybrid stars formed by hadronic and quark matter in
$\beta$-equilibrium are described by appropriate equations of state (EoS) in
the framework of the quark meson coupling (QMC) model. In the present work we
include the possibility of trapped neutrinos in the equation of state and
obtain the properties... | 0312112v2 |
2004-02-26 | Effects of phonon-phonon coupling on low-lying states in neutron-rich Sn isotopes | Starting from an effective Skyrme interaction we present a method to take
into account the coupling between one- and two-phonon terms in the wave
functions of excited states. The approach is a development of a finite rank
separable approximation for the quasiparticle RPA calculations proposed in our
previous work. The ... | 0402096v1 |
2004-03-23 | A Semiclassical Approach to Fusion Reactions | The semiclassical method of Alder and Winther is generalized to study fusion
reactions. As an illustration, we evaluate the fusion cross section in a
schematic two-channel calculation. The results are shown to be in good
agreement with those obtained with a quantal Coupled-Channels calculation. We
suggest that in the c... | 0403070v1 |
2004-04-26 | Role of the Landau-Migdal Parameters with the Pseudovector and the Tensor Coupling in Relativistic Nuclear Models -- The Quenching of the Gamow-Teller Strength -- | Role of the Landau-Migdal parameters with the pseudovector ($g_a$) and the
tensor coupling ($g_t$) is examined for the giant Gamow-Teller (GT) states in
the relativistic random phase approximation (RPA). The excitation energy is
dominated by both $g_a$ and $g_t$ in a similar way, while the GT strength is
independent of... | 0404074v1 |
2005-01-27 | Full-coupled channel approach to S=-2 s-shell hypernuclear systems | We describe full-coupled-channel ab initio calculations among the octet
baryons for S=-2 s-shell hypernuclei,_{LambdaLambda}^4H,_{LambdaLambda}^5H
and_{LambdaLambda}^6He. The wave function includes Lambda Lambda, Lambda Sigma,
N Xi, and Sigma Sigma channels. Minnesota NN, D2^\prime YN and Nijmegen model D
simulated YY ... | 0501071v1 |
2005-02-02 | J/Psi strong couplings to the vector mesons | We present a study of the cross sections J/Psi X --> D^(*) \bar D^(*) (X =
rho, Phi) based on the calculation of the effective tri- and four-linear
couplings
J/Psi (X) D^(*) \bar D^(*) within a constituent quark model. In particular,
the details of the calculation of the four-linear couplings J/Psi X D^(*)\bar
D^(*) ... | 0502009v1 |
2005-03-04 | K-Lambda and K-Sigma photoproduction in a coupled channels framework | A coupled channels analysis, based on the K-matrix approach, is presented for
photo-induced kaon production. It is shown that channel coupling effects are
large and should not be ignored. The importance of contact terms in the
analysis, associated with short range correlations, is pointed out. The
extracted parameters ... | 0503013v3 |
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