publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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1992-07-05 | $V'Z$ and $V'W$ Production as Tests of Heavy Gauge Boson Couplings at Future Hadron Colliders | We point out that the production cross section of $pp\to V'V$, with
$V'=W',Z'$ and $V=W,Z$ is a useful diagnostic of $V'$ gauge couplings at future
hadron colliders. For $M_{Z'}\simeq1$ TeV it would allow determination of
combinations of $Z'$ gauge couplings to the quarks to around 10 percent. An
analysis of the extrac... | 9207216v1 |
1993-03-01 | On the Unification of Couplings in the Minimal Supersymmetric Standard Model | The unification of gauge and Yukawa couplings within the minimal
supersymmetric standard model is studied at the two loop level. We derive an
expression for the effective scale, $T_{SUSY}$, which characterizes the
supersymmetric particle threshold corrections to the gauge couplings, and
demonstrate that $T_{SUSY}$ is o... | 9303202v1 |
1993-07-11 | Baryon-Pion Couplings from Large-N QCD | We derive a set of consistency conditions for the pion-baryon coupling
constants in the large-N limit of QCD. The consistency conditions have a unique
solution which are precisely the values for the pion-baryon coupling constants
in the Skyrme model. We also prove that non-relativistic $SU(2N_f)$ spin-flavor
symmetry (... | 9307241v1 |
1994-03-22 | Constraints on Baryon-Nonconserving Yukawa Couplings in a Supersymmetric Theory | The 1-loop evolution of couplings in the minimal supersymmetric standard
model, extended to include baryon nonconserving $(B\!\!\!/)$ operators through
explicit $R$-parity violation, is considered keeping only $B\!\!\!/$
superpotential terms involving the maximum possible number of third generation
superfields. If all ... | 9403350v2 |
1995-05-19 | NEW PHYSICS AND RECENT HIGH PRECISION ELECTROWEAK MEASUREMENTS | We analyze LEP and SLC data from the 1995 Winter Conferences for signals of
new physics. We compare the data with the Standard Model (SM) as well as a
number of test hypotheses concerning the nature of new physics: (i) nonstandard
Zbb couplings, (ii) nonstandard Zff couplings for the entire third generation,
(iii) nons... | 9505339v1 |
1995-06-24 | Large $R$-parity Violating Couplings and Grand Unification | We consider a possibility that $R$-parity violating interactions of particles
which do not involve the first generation have large (up to 1) coupling
constants, $\Lambda$. Such couplings, if exist, could have a number of
phenomenological consequences: renormalization of $b-\tau$ mass ratio,
generation of $\nu_\tau$ mas... | 9506416v2 |
1995-11-27 | Radiative corrections to neutrino-majoron couplings | It is claimed that radiative corrections maintain the proportionality between
the neutrino mass and the neutrino-majoron coupling and never give rise to
enhanced decay rates in conventional majoron models. The coupling of a majoron
to neutrinos is calculated at one loop level in various models, including the
singlet ma... | 9511416v1 |
1996-07-24 | Unitarity Constraints on Anomalous Top Quark Couplings to Weak Gauge Bosons | If there is new physics associated with the top quark, it could show up as
anomalous couplings of the top quark to weak gauge bosons, such as $Z\ttbar$
and $W\tbbar$ vector and axial-vector couplings. We use the processes
$\ttbar\to Z^0Z^0$, $\ttbar\to W^+W^-$, and $\ttbar\to Z^0H$ to obtain the
unitarity constraints o... | 9607413v2 |
1997-06-03 | Naive Dimensional Analysis and Supersymmetry | In strongly-coupled theories with no small parameters, there are factors of
4\pi that appear when the couplings of the low-energy effective lagrangian are
written in units of the effective cutoff \Lambda. These numerical factors can
be explained using "naive dimensional analysis." We extend these ideas to
supersymmetri... | 9706235v1 |
1998-04-17 | Study of Trilinear Gauge Boson Couplings at the Tevatron Collider | We review studies of the trilinear gauge boson couplings at the Tevatron
proton-antiproton collider from data collected by the CDF and D0 collaborations
during the period 1992--1996. The gauge boson couplings are a fundamental
prediction of the standard model, resulting from the non-Abelian nature of the
theory. Theref... | 9804322v2 |
1998-04-23 | Solving a Coupled Set of Truncated QCD Dyson-Schwinger Equations | Truncated Dyson-Schwinger equations represent finite subsets of the equations
of motion for Green's functions. Solutions to these non-linear integral
equations can account for non-perturbative correlations. A closed set of
coupled Dyson-Schwinger equations for the propagators of gluons and ghosts in
Landau gauge QCD is... | 9804376v1 |
1998-08-13 | Units and Numerical Values of the Effective Couplings in Perturbative Heterotic String Vacua | We determine the units and numerical values for a class of couplings in the
effective theory of perturbative heterotic string vacua, with the emphasis on
the correct translation between the canonical gauge coupling g and Planck scale
M_Planck ~ 1.2 x 10^19 GeV as used in the effective theory description and the
string ... | 9808321v1 |
1999-05-31 | Mirage Gauge Coupling Unification and TeV Scale Strings | We consider gauge coupling unification in models with TeV scale strings and
large compact dimensions realized as type IIB string orientifolds. Following an
observation by Ibanez we show that the gauge couplings at low energies can
behave as if they effectively unify at $M_U \sim 2 \times 10^{16} GeV$ with
$\alpha_U \si... | 9905577v1 |
1999-06-01 | Bounds on R-parity Violating Couplings at the Weak Scale and at the GUT Scale | We present an update of the most stringent experimental bounds on the
trilinear R-parity violating couplings. We then analyse bounds on the R-parity
violating couplings at the unification scale by renormalising the weak scale
bounds. We derive unification scale upper bounds upon the couplings which are
broadly independ... | 9906209v2 |
2000-09-05 | Probing Anomalous Top Quark Couplings at the Future Linear Colliders | In terms of an effective Lagrangian we investigate the possibilities of
probing anomalous top quark couplings, $t \bar{t} H$, $\gamma t \bar{t}$, $Z t
\bar{t}$ and $tWb$ at the future linear colliders. It is found that probing
anomalous top quark couplings, $t \bar{t} H$, $\gamma t \bar{t}$, $Z t \bar{t}$
and $tWb$ at ... | 0009047v2 |
2000-10-31 | A Constraint on Yukawa-Coupling Unification from Lepton-Flavor Violating Processes | We present a new constraint on a lepton mixing matrix $V$ from lepton-flavor
violating (LFV) processes in supersymmetric standard models with massive
neutrinos. Here, we assume Yukawa-coupling unification $f_{\nu 3}\simeq f_{\rm
top}$, in which $\tau$-neutrino Yukawa coupling $f_{\nu 3}$ is unified into
top-quark Yukaw... | 0010348v1 |
2000-12-14 | Trilinear Neutral Gauge Boson Couplings in Effective Theories | We list all the lowest dimension effective operators inducing off-shell
trilinear neutral gauge boson couplings Z-Z-Photon, Z-Photon-Photon, and ZZZ
within the effective Lagrangian approach, both in the linear and nonlinear
realizations of the SU(2)_{L} X U(1)_Y gauge symmetry. In the linear scenario
we find that these... | 0012180v1 |
2001-04-10 | Freezing of QCD coupling affects the short distance static potential | A striking contradiction between lattice short range static potential (nf=0)
and standard perturbative potential, observed by Bali G.S., is investigated in
the framework of the background perturbation theory. With the use of the
background coupling which contains the only background parameter - mass mB,
fixed by fine s... | 0104097v5 |
2001-07-10 | Measuring effective electroweak couplings in single top production at the LHC | We study the mechanism of single top production at the LHC in the framework
of an effective electroweak Lagrangian, analyzing the sensitivity of different
observables to the magnitude of the effective couplings that parametrize new
physics beyond the Standard Model. The observables relevant to the distinction
between l... | 0107112v1 |
2001-08-29 | Yukawa coupling quantum corrections to the self couplings of the lightest MSSM Higgs boson | A detailed analysis of the top-quark/squark quantum corrections to the
lightest CP-even Higgs boson (h^0) self-couplings is presented in the MSSM. By
considering the leading one-loop Yukawa-coupling contributions of O(m_t^4), we
discuss the decoupling behaviour of these corrections when the top-squarks are
heavy compar... | 0108245v2 |
2001-10-17 | Constraints on heavy Z' couplings from ΔS = 2 B^- -> K^- K^- π^+ decay | The heavy Z' boson with family nonuniversal couplings can introduce flavour
changing effects. Constraints on nondiagonal Z' couplings coming from the \mu-e
conversion in a muonic atom, K^0 - \bar{K^0} and B - \bar{B} mixing, epsilon
and epsilon'/ \epsilon CP- violating coefficients have been already
established. By usi... | 0110233v1 |
2002-01-30 | Neutrinoless Double Beta Decay with R-parity Violation | We consider recently observed neutrinoless double beta decay in the context
of the minimal supersymmetric standard model with R-parity violating couplings
lambda^{'}. We observe that most of the current experimental bounds on the
R-parity violating couplings do not exclude the possibility that the
neutrinoless double b... | 0201277v3 |
2002-09-19 | Triple gauge couplings in polarised e-e+ -> W-W+ and their measurement using optimal observables | The sensitivity of optimal integrated observables to electroweak triple gauge
couplings is investigated for the process e-e+ -> W-W+ -> 4 fermions at future
linear colliders. By a suitable reparameterisation of the couplings we achieve
that all 28 coupling parameters have uncorrelated statistical errors and are
natural... | 0209229v1 |
2003-07-24 | Models of quintessence coupled to the electromagnetic field and the cosmological evolution of alpha | We study the change of the effective fine structure constant in the
cosmological models of a scalar field with a non-vanishing coupling to the
electromagnetic field. Combining cosmological data and terrestrial observations
we place empirical constraints on the size of the possible coupling and explore
a large class of ... | 0307299v2 |
2003-11-19 | Weak Isospin Violations in Charged and Neutral Higgs Couplings from SUSY Loop Corrections | Supersymmetric QCD and supersymmetric electroweak loop corrections to the
violations of weak isospin to Yukawa couplings are investigated. Specifically
it involves an analysis of the supersymmetric loop corrections to the Higgs
couplings to the third generation quarks and leptons. Here we analyze the SUSY
loop correcti... | 0311242v1 |
2004-06-16 | On the determination of the structure of the scalar Higgs boson's couplings to vectorbosons | In this paper we investigate the determination of the coupling structure of a
Higgs boson at the LHC using angular correlations in the decay chain H -> ZZ ->
4l. We consider the most general couplings of a scalar to spin 1 particles and
compare the angular correlations of the decay products using a maximum
likelihood m... | 0406181v1 |
2004-07-16 | Determination of Higgs-boson couplings at the LHC | We investigate the determination of Higgs boson couplings to gauge bosons and
fermions at the LHC from data on Higgs boson production and decay. We
demonstrate that very mild theoretical assumptions, which are valid in general
multi-Higgs doublet models, are sufficient to allow the extraction of absolute
values of the ... | 0407190v1 |
2005-08-01 | Next-to-Leading Order QCD Corrections to the Direct Top Quark Production via Model-independent FCNC Couplings at Hadron Colliders | We calculated the next-to-leading order (NLO) QCD corrections to the cross
sections for direct top quark productions induced by model--independent flavour
changing neutral current couplings at hadron colliders. The NLO results
increase the experimental sensitivity to the anomalous couplings. Our results
show that the N... | 0508016v4 |
2005-08-11 | Effective-Lagrangian approach to gamma gamma --> WW; II: Results and comparison with e+e- --> WW | We present a study of anomalous electroweak gauge-boson couplings which can
be measured in e+e- and gamma gamma collisions at a future linear collider like
ILC. We consider the gauge-boson sector of a locally SU(2) x U(1) invariant
effective Lagrangian with ten dimension-six operators added to the Lagrangian
of the Sta... | 0508133v2 |
2005-12-07 | Running coupling at finite temperature and chiral symmetry restoration in QCD | We analyze the running gauge coupling at finite temperature for QCD, using
the functional renormalization group. The running of the coupling is calculated
for all scales and temperatures. At finite temperature, the coupling is
governed by a fixed point of the 3-dimensional theory for scales smaller than
the correspondi... | 0512085v2 |
2006-01-06 | All Order Running Coupling BFKL Evolution from GLAP (and vice-versa) | We present a systematic formalism for the derivation of the kernel of the
BFKL equation from that of the GLAP equation and conversely to any given order,
with full inclusion of the running of the coupling. The running coupling is
treated as an operator, reducing the inclusion of running coupling effects and
their facto... | 0601049v2 |
2006-07-12 | Heavy flavor diffusion in weakly coupled N=4 Super Yang-Mills theory | We use perturbation theory to compute the diffusion coefficient of a heavy
quark or scalar moving in N=4 SU(N_c) Super Yang-Mills plasma to leading order
in the coupling and the ratio T/M<<1. The result is compared both to recent
strong coupling calculations in the same theory and to the corresponding weak
coupling res... | 0607148v3 |
2006-08-12 | Current algebra derivation of temperature dependence of hadron couplings with currents | The vector and the axial-vector meson couplings with the vector and the
axial-vector currents respectively at finite temperature have been obtained in
Ref. \cite{Mallik} by calculating all the relevant one-loop Feynman graphs with
vertices obtained from the effective chiral Lagrangian. On the other hand, the
same coupl... | 0608141v1 |
2006-12-06 | The single t-quark productions via the flavor-changing processes in the topcolor-assisted technicolor model at the hadron colliders | In the framework of topcolor-assisted technicolor(TC2) model, there exist
tree-level flavor-changing (FC) couplings which can result in the loop-level FC
coupling $tcg$. Such $tcg$ coupling can contribute significant clues at the
forthcoming Large Hadron Collider (LHC) experiments. In this paper, based on
the TC2 model... | 0612063v1 |
2007-03-20 | Anomalous Higgs Couplings in the $SO(5)\times U(1)_{B-L}$ Gauge-Higgs Unification in Warped Spacetime | The gauge couplings $WWZ$, $WWWW$, and $WWZZ$ in the gauge-Higgs unification
scenario in the Randall-Sundrum warped spacetime remain almost universal as in
the standard model, but substantial deviation results for the Higgs couplings.
In the $SO(5)\times U(1)_{B-L}$ model, the couplings $WWH$ and $ZZH$ are
suppressed b... | 0703212v3 |
1993-03-08 | 4D Quantum Gravity Coupled to Matter | We investigate the phase structure of four-dimensional quantum gravity
coupled to Ising spins or Gaussian scalar fields by means of numerical
simulations.
The quantum gravity part is modelled by the summation over random simplicial
manifolds, and the matter fields are located in the center of the 4-simplices,
which c... | 9303042v1 |
1993-07-03 | Potential Flow Of The Renormalisation Group In A Simple Two Component Model | The renormalisation group (RG) flow on the space of couplings of a simple
model with two couplings is examined. The model considered is that of a single
component scalar field with $\phi^4$ self interaction coupled, via Yukawa
coupling, to a fermion in flat four dimensional space. The RG flow on the two
dimensional spa... | 9307023v1 |
1994-01-14 | The String Dilaton and a Least Coupling Principle | It is pointed out that string-loop modifications of the low-energy matter
couplings of the dilaton may provide a mechanism for fixing the vacuum
expectation value of a massless dilaton in a way which is naturally compatible
with existing experimental data. Under a certain assumption of universality of
the dilaton coupl... | 9401069v1 |
1994-06-20 | Coping With Strongly Coupled String Theory | String theory, if it describes nature, is probably strongly coupled. As a
result, one might despair of making any statements about the theory. In the
framework of a set of clearly spelled out assumptions, we show that this is not
necessarily the case. Certain discrete gauge symmetries, combined with
supersymmetry, tigh... | 9406132v2 |
1995-05-06 | Phase transition by curvature in three dimensional $O(N)$ sigma model | Using the effective potential, the large-$N$ nonlinear $O(N)$ sigma model
with the curvature coupled term is studied on $S^2\times R^1$. We show that,
for the conformally coupled case, the dynamical mass generation of the model in
the strong-coupled regime on $R^3$ takes place for any finite scalar curvature
(or radius... | 9505036v2 |
1995-12-21 | String Dynamics at Strong Coupling | The dynamics of superstring, supergravity and M theories and their
compactifications are probed by studying the various perturbation theories that
emerge in the strong and weak coupling limits for various directions in
coupling constant space. The results support the picture of an underlying
non-perturbative theory tha... | 9512181v2 |
1996-02-15 | The Strong-Coupling Spectrum of the Seiberg-Witten Theory | We carefully study the global structure of the solution of the $N=2$
supersymmetric pure Yang-Mills theory with gauge group $SU(2)$ obtained by
Seiberg and Witten. We exploit its ${\bf Z}_2$-symmetry and describe the curve
in moduli space where BPS states can become unstable, separating the
strong-coupling from the wea... | 9602082v3 |
1996-06-17 | Non-Uniqueness of Quantized Yang-Mills Theories | We consider quantized Yang-Mills theories in the framework of causal
perturbation theory which goes back to Epstein and Glaser. In this approach
gauge invariance is expressed by a simple commutator relation for the S-matrix.
The most general coupling which is gauge invariant in first order contains a
two-parametric amb... | 9606100v1 |
1996-10-18 | On the weak coupling spectrum of N=2 supersymmetric SU(n) gauge theory | The weak coupling spectrum of BPS saturated states of pure $N=2$
supersymmetric SU$(n)$ gauge theory is investigated. The method uses known
results on the dyon spectrum of the analogous theory with $N=4$ supersymmetry,
along with the action on these states of the semi-classical monodromy
transformations. For dyons whos... | 9610142v1 |
1997-10-27 | Finite quantum field theories: Clifford algebras for Yukawa couplings? | By imposing on the most general renormalizable quantum field theory the
requirement of the absence of ultraviolet-divergent renormalizations of the
physical parameters (masses and coupling constants) of the theory, finite
quantum field theories in four space-time dimensions may be constructed. Famous
prototypes of thes... | 9710202v1 |
1997-11-24 | Clifford algebras in finite quantum field theories II. Reducible Yukawa finiteness condition | An arbitrary renormalizable quantum field theory is considered as finite if
its dimensionless couplings conspire to yield, at every order of its
perturbative expansion, no ultraviolet-divergent renormalizations of the
physical parameters of the theory. The "finiteness conditions" resulting from
these requirements form ... | 9711176v1 |
1998-06-20 | Coupling of M-Branes in M-Theory | Coupling of a membrane and a five-brane to the bosonic sector of D=11
supergravity is considered. The five--brane is a dyonic object which carries
both an electric and a magnetic charge of the D=11 three-form gauge field
$A^3$, and it couples not only to $A^3$ but also minimally couples to a
six-form field $A^6$ dual t... | 9806175v1 |
1998-11-09 | Super Yang-Mills at Weak, Intermediate and Strong Coupling | We consider three dimensional SU(N) N=1 super-Yang-Mills compactified on the
space-time R X S^1 X S^1. In particular, we compactify the light-cone
coordinate x^- on a light-like circle via DLCQ, and wrap the remaining
transverse coordinate on a spatial circle. By retaining only the first few
excited modes in the transv... | 9811083v1 |
2000-05-03 | A Yang-Mills Theory in Loop Space and Generalized Chapline-Manton Coupling | We consider a Yang-Mills theory in loop space with an affine Lie gauge group.
The Chapline-Manton coupling, the coupling between Yang-Mills fields and an
abelian antisymmetric tensor field of second rank via the Chern-Simons term, is
systematically derived within the framework of the Yang-Mills theory. The
generalized ... | 0005030v2 |
2001-04-05 | Gauge-Invariant Couplings of Noncommutative Branes to Ramond-Ramond Backgrounds | We derive the couplings of noncommutative D-branes to spatially varying
Ramond-Ramond fields, extending our earlier results in hep-th/0009101. These
couplings are expressed in terms of *n products of operators involving open
Wilson lines. Equivalence of the noncommutative to the commutative couplings
implies interestin... | 0104045v2 |
2001-07-03 | On The Strong-Coupling Spectrum of Pure SU(3) Seiberg-Witten Theory | We consider the two complex dimensional moduli space of supersymmetric vacua
for low energy effective N=2 SYM with gauge group SU(3). We describe, at the
topological level, a consistent model of how the relevant curves of marginal
stability (CMS) intertwine with the branch cuts to partition the moduli space
into pieces... | 0107016v2 |
2001-09-14 | Complete Cubic and Quartic Couplings of 16 and $\bar {16}$ in SO(10) Unification | A recently derived basic theorem on the decomposition of SO(2N) vertices is
used to obtain a complete analytic determination of all SO(10) invariant cubic
superpotential couplings involving $16_{\pm}$ semispinors of SO(10) chirality
$\pm$ and tensor representations. In addition to the superpotential couplings
computed ... | 0109116v2 |
2001-10-04 | Bulk versus brane running couplings | A simplified higher dimensional Randall-Sundrum-like model in 6 dimensions is
considered. It has been observed previously by Goldberger and Wise that in such
a self-interacting scalar theory on the bulk with a conical singularity there
is mixing of renormalization of 4d brane couplings with that of the bulk
couplings. ... | 0110051v1 |
2002-12-05 | Supersymmetric Yang-Mills theories with local coupling: The supersymmetric gauge | Supersymmetric pure Yang-Mills theory is formulated with a local, i.e.
space-time dependent, complex coupling in superspace. Super-Yang-Mills theories
with local coupling have an anomaly, which has been first investigated in the
Wess-Zumino gauge and there identified as an anomaly of supersymmetry. In a
manifest supers... | 0212064v2 |
2003-01-26 | Conformal Invariance, Anomalous Gravitational Coupling and Derivation of a Particle Concept | We study a gravitational model whose vacuum sector is invariant under
conformal transformations. In this model we investigate the anomalous
gravitational coupling of the large-scale matter. In this kind of coupling the
large-sale matter is taken to couple to a metric which is different but
conformally related to the me... | 0301208v2 |
2003-04-11 | Dimensionally reduced gravity theories are asymptotically safe | 4D Einstein gravity coupled to scalars and abelian gauge fields in its
2-Killing vector reduction is shown to be quasi-renormalizable to all loop
orders at the expense of introducing infinitely many essential couplings. The
latter can be combined into one or two functions of the `area radius'
associated with the two Ki... | 0304117v1 |
2003-10-20 | Exact Wall Solutions in 5-Dimensional SUSY QED at Finite Coupling | A series of exact BPS solutions are found for single and double domain walls
in N=2 supersymmetric (SUSY) QED for finite gauge coupling constants. Vector
fields are found to be massive, although it is localized on the wall. Massless
modes can be assembled into a chiral scalar multiplet of the preserved N=1
SUSY, after ... | 0310189v2 |
2004-04-08 | The Strong-Coupling Expansion and the Ultra-local Approximation in Field Theory | We discuss the strong-coupling expansion in Euclidean field theory. In a
formal representation for the Schwinger functional, we treat the off-diagonal
terms of the Gaussian factor as a perturbation about the remaining terms of the
functional integral. We first study the strong-coupling expansion in the \phi^4
theory an... | 0404070v1 |
2004-06-29 | Coupling constant dependence of the shear viscosity in N=4 supersymmetric Yang-Mills theory | Gauge theory - gravity duality predicts that the shear viscosity of N=4
supersymmetric SU(N_c) Yang-Mills plasma at temperature T in the limit of large
N_c and large 't Hooft coupling g^2_{YM} N_c is independent of the coupling and
equals to \pi N_c^2 T^3/8. In this paper, we compute the leading correction to
the shear... | 0406264v3 |
2004-11-25 | A dual gravity study of the 2+1D compact U(1) gauge theory coupled with strongly interacting matter fields | We consider the D2-brane probe action in the gravity background dual to N
coincident Dp-branes by treating the separation between the D2- and Dp-branes
as a nondynamical parameter for $p=2,4,6$. The gauge coupling, the core size of
a non-BPS instanton and the mass gap of the compact U(1) gauge theory in the
D2-brane ar... | 0411239v3 |
2006-05-23 | Anomalies, Anomalous U(1)'s and generalized Chern-Simons terms | A detailed analysis of anomalous U(1)'s and their effective couplings is
performed both in field theory and string theory. It is motivated by the
possible relevance of such couplings in particle physics, as well as a
potential signal distinguishing string theory from other UV options. The most
general anomaly related e... | 0605225v2 |
2004-08-27 | Stochastic Dynamics of a Coupled Atmosphere--Ocean Model | The investigation of the coupled atmosphere-ocean system is not only
scientifically challenging but also practically important.
We consider a coupled atmosphere-ocean model, which involves hydrodynamics,
thermodynamics, and random atmospheric dynamics due to short time influences at
the air-sea interface. We reformul... | 0408386v1 |
2002-05-04 | Random Coupling of Chaotic Maps leads to Spatiotemporal Synchronisation | We investigate the spatiotemporal dynamics of a network of coupled chaotic
maps, with varying degrees of randomness in coupling connections. While
strictly nearest neighbour coupling never allows spatiotemporal synchronization
in our system, randomly rewiring some of those connections stabilises entire
networks at $x^*... | 0205008v1 |
2002-11-08 | Diffusive transport and self-consistent dynamics in coupled maps | The study of diffusion in Hamiltonian systems has been a problem of interest
for a number of years.
In this paper we explore the influence of self-consistency on the diffusion
properties of systems described by coupled symplectic maps. Self-consistency,
i.e. the back-influence of the transported quantity on the veloc... | 0211011v1 |
2002-11-22 | Emergence of patterns in driven and in autonomous spatiotemporal systems | The relationship between a driven extended system and an autonomous
spatiotemporal system is investigated in the context of coupled map lattice
models. Specifically, a locally coupled map lattice subjected to an external
drive is compared to a coupled map system with similar local couplings plus a
global interaction. I... | 0211041v1 |
2003-05-07 | Dynamics of FitzHugh-Nagumo excitable systems with delayed coupling | Small lattices of $N$ nearest neighbor coupled excitable FitzHugh-Nagumo
systems, with time-delayed coupling are studied, and compared with systems of
FitzHugh-Nagumo oscillators with the same delayed coupling. Bifurcations of
equilibria in N=2 case are studied analytically, and it is then numerically
confirmed that th... | 0305010v1 |
2004-04-28 | Parameter mismatches,variable delay times and synchronization in time-delayed systems | We investigate synchronization between two unidirectionally linearly coupled
chaotic non-identical time-delayed systems and show that parameter mismatches
are of crucial importance to achieve synchronization. We establish that
independent of the relation between the delay time in the coupled systems and
the coupling de... | 0404050v1 |
2005-03-31 | Synchronization in driven versus autonomous coupled chaotic maps | The phenomenon of synchronization occurring in a locally coupled map lattice
subject to an external drive is compared to the synchronization process in an
autonomous coupled map system with similar local couplings plus a global
interaction. It is shown that chaotic synchronized states in both systems are
equivalent, bu... | 0504001v1 |
2005-10-13 | Modulational instability in asymmetric coupled wave functions | The evolution of the amplitude of two nonlinearly interacting waves is
considered, via a set of coupled nonlinear Schroedinger-type equations. The
dynamical profile is determined by the wave dispersion laws (i.e. the group
velocities and the GVD terms) and the nonlinearity and coupling coefficients,
on which no assumpt... | 0510029v2 |
2005-12-17 | Synchronous Behavior of Coupled Systems with Discrete Time | The dynamics of one-way coupled systems with discrete time is considered. The
behavior of the coupled logistic maps is compared to the dynamics of maps
obtained using the Poincare sectioning procedure applied to the coupled
continuous-time systems in the phase synchronization regime. The behavior
(previously considered... | 0512045v1 |
2006-05-25 | Predictions of ultra-harmonic oscillations in coupled arrays of limit cycle oscillators | Coupled distinct arrays of nonlinear oscillators have been shown to have a
regime of high frequency, or ultra-harmonic, oscillations that are at multiples
of the natural frequency of individual oscillators. The coupled array
architectures generate an in-phase high-frequency state by coupling with an
array in an anti-ph... | 0605045v2 |
2006-09-18 | Complete chaotic synchronization in mutually coupled time-delay systems | Complete chaotic synchronization of end lasers has been observed in a line of
mutually coupled, time-delayed system of three lasers, with no direct
communication between the end lasers. The present paper uses ideas from
generalized synchronization to explain the complete synchronization in the
presence of long coupling... | 0609047v3 |
2006-09-21 | Scaling properties of invariant densities of coupled Tchebyscheff maps | We study 1-dimensional coupled map lattices consisting of diffusively coupled
Tchebyscheff maps of N-th order. For small coupling constants a we determine
the invariant 1-point and 2-point densities of these nonhyperbolic systems in a
perturbative way. For arbitrarily small couplings a>0 the densities exhibit a
selfsim... | 0609052v2 |
1999-07-06 | Coupled-channels analysis of the $^{\bf 16}$O+$^{\bf 208}$Pb fusion barrier distribution | Analyses using simplified coupled-channels models have been unable to
describe the shape of the previously measured fusion barrier distribution for
the doubly magic $^{16}$O+$^{208}$Pb system. This problem was investigated by
re-measuring the fission excitation function for $^{16}$O+$^{208}$Pb with
improved accuracy an... | 9907003v1 |
1995-07-14 | Theory of Multiphonon Excitation in Heavy-Ion Collisions | We study the effects of channel coupling in the excitation dynamics of giant
resonances in relativistic heavy ions collisions. For this purpose, we use a
semiclassical approximation to the Coupled-Channels problem and separate the
Coulomb and the nuclear parts of the coupling into their main multipole
components. In or... | 9507027v1 |
1997-06-28 | Importance of Non-Linear Couplings in Fusion Barrier Distributions and Mean Angular Momenta | The effects of higher order coupling of surface vibrations to the relative
motion on heavy-ion fusion reactions at near-barrier energies are investigated.
The coupled channels equations are solved to all orders, and also in the linear
and the quadratic coupling approximations. It is shown that the shape of fusion
barri... | 9706083v1 |
2000-04-05 | Pseudovector versus pseudoscalar coupling in kaon photoproduction - revisited | The question of pseudovector versus pseudoscalar coupling schemes for the
kaon-hyperon-nucleon interaction is re-examined for the reaction $\gamma p\to
K^+ \Lambda$ in several isobaric models. These models typically include Born
terms, $K^*$- and $K_1$-exchange in the t-channel, and a few different
combinations of spin... | 0004007v1 |
2000-05-14 | A New Coupling Potential for the Scattering of Deformed Light Heavy-Ions | This letter introduces a new coupling potential to explain the experimental
data over wide energy ranges for a number of systems. Within the
coupled-channels formalism, this letter first shows the limitations of the
standard coupled-channels theory in the case where one of the nuclei in the
reaction is strongly deforme... | 0005035v4 |
2001-05-06 | An Analysis of the $^{12}$C+$^{12}$C Reaction Using a New Type of Coupling Potential | A new approach has been used to explain the experimental data for the
$^{12}$C+$^{12}$C system over a wide energy range in the laboratory system from
32.0 MeV to 126.7 MeV. This new coupled-channels based approach involves
replacing the usual first derivative coupling potential by a new,
second-derivative coupling pote... | 0105016v1 |
2001-11-06 | Nuclear Ground State Observables and QCD Scaling in a Refined Relativistic Point Coupling Model | We present results obtained in the calculation of nuclear ground state
properties in relativistic Hartree approximation using a Lagrangian whose
QCD-scaled coupling constants are all natural (dimensionless and of order 1).
Our model consists of four-, six-, and eight-fermion point couplings (contact
interactions) toget... | 0111012v2 |
2001-11-16 | Effect of continuum couplings in fusion of halo $^{11}$Be on $^{208}$Pb around the Coulomb barrier | The effect of continuum couplings in the fusion of the halo nucleus $^{11}$Be
on $^{208}$Pb around the Coulomb barrier is studied using a three-body model
within a coupled discretised continuum channels (CDCC) formalism. We
investigate in particular the role of continuum-continuum couplings. These are
found to hinder t... | 0111051v1 |
2002-02-21 | The $ρNN$ coupling with direct coupling and loops | Starting from a gauge formalism of $\rho$ mesons, pions and baryons we
evaluate the $\rho$ coupling to the nucleon, including the direct coupling
provided by the Lagrangians, plus contributions from loops with the virtual
pion cloud. We find a contribution to the magnetic $\rho$ coupling to the
nucleon from pionic loop... | 0202070v2 |
2004-07-01 | Effective meson masses, effective meson-nucleon couplings and neutron star radii | Using the generalized mean field theory, we have studied the relation among
the effective meson masses, the effective meson-nucleon couplings and the
equation of state (EOS) in asymmetric nuclear matter. If the effective
omega-meson mass becomes smaller at high density, the EOS becomes stiffer.
However, if we require t... | 0407004v1 |
2004-09-27 | Nuclear Structure Calculations with Coupled Cluster Methods from Quantum Chemistry | We present several coupled-cluster calculations of ground and excited states
of 4He and 16O employing methods from quantum chemistry. A comparison of
coupled cluster results with the results of exact diagonalization of the
hamiltonian in the same model space and other truncated shell-model
calculations shows that the q... | 0409062v1 |
1997-01-10 | Synchronization of globally-coupled phase oscillators: singularities and scaling for general couplings | The onset of collective behavior in a population of globally coupled
oscillators with randomly distributed frequencies is studied for phase
dynamical models with arbitrary coupling; the effect of a stochastic temporal
variation in the frequencies is also included. The Fokker-Planck equation for
the coupled Langevin sys... | 9701006v1 |
2005-08-12 | Optimization of coupling between photonic crystal resonator and curved microfiber | The evanescent coupling from a photonic crystal resonator to a micron-thick
optical fiber is investigated in detail by using a 3D-FDTD method. Properly
designed photonic crystal cavity and taper structures are proposed, and optimal
operating conditions are found to enhance the coupling strength while
suppressing other ... | 0508078v1 |
2006-03-31 | On the Role of Penning Ionization in Photoassociation Spectroscopy | We study the role of Penning ionization on the photoassociation spectra of
He(^3S)-He(^3S). The experimental setup is discussed and experimental results
for different intensities of the probe laser are shown. For modelling the
experimental results we consider coupled-channel calculations of the crossing
of the ground s... | 0603268v1 |
2006-06-14 | Measurement of mutual inductance from frequency dependence of impedance of AC coupled circuit using digital dual-phase lock-in amplifier | We present a simple method to determine the mutual inductance $M$ between two
coils in a coupled AC circuit by using a digital dual-phase lock-in amplifier.
The frequency dependence of the real and imaginary parts is measured as the
coupling constant is changed. The mutual inductance $M$ decreases as the
distance $d$ b... | 0606124v3 |
1999-02-09 | Quantum gates by coupled asymmetric quantum dots and controlled-NOT-gate operation | A quantum computer based on an asymmetric coupled dot system has been
proposed and shown to operate as the controlled-NOT-gate. The basic idea is (1)
the electron is localized in one of the asymmetric coupled dots. (2)The
electron transfer takes place from one dot to the other when the energy-levels
of the coupled dots... | 9902031v2 |
2003-06-14 | Use of Quadrupolar Nuclei for Quantum Information processing by Nuclear Magnetic Resonance: Implementation of a Quantum Algorithm | Physical implementation of Quantum Information Processing (QIP) by
liquid-state Nuclear Magnetic Resonance (NMR), using weakly coupled spin-1/2
nuclei of a molecule, is well established. Nuclei with spin$>$1/2 oriented in
liquid crystalline matrices is another possibility. Such systems have multiple
qubits per nuclei a... | 0306100v1 |
2004-07-15 | Superconducting Phase Qubit Coupled to a Nanomechanical Resonator: Beyond the Rotating-Wave Approximation | We consider a simple model of a Josephson junction phase qubit coupled to a
solid-state nanoelectromechanical resonator. This and many related
qubit-resonator models are analogous to an atom in an electromagnetic cavity.
When the systems are weakly coupled and nearly resonant, the dynamics is
accurately described by th... | 0407106v1 |
2005-10-17 | The effects of nonlinear couplings and external magnetic field on the thermal entanglement in a two-spin-qutrit system | We investigate the effects of nonlinear couplings and external magnetic field
on the thermal entanglement in a two-spin-qutrit system by applying the concept
of negativity. It is found that the nonlinear couplings favor the thermal
entanglement creating. Only when the nonlinear couplings $|K|$ are larger than
a certain... | 0510129v1 |
2007-04-03 | Spin-orbit coupling effect on the persistent currents in mesoscopic ring with an Anderson impurity | Based on the finite $U$ slave boson method, we have investigated the effect
of Rashba spin-orbit(SO) coupling on the persistent charge and spin currents in
mesoscopic ring with an Anderson impurity. It is shown that the Kondo effect
will decrease the magnitude of the persistent charge and spin currents in this
side-cou... | 0704.0319v1 |
2007-05-17 | The phase structure of a chirally invariant lattice Higgs-Yukawa model for small and for large values of the Yukawa coupling constant | We consider a chirally invariant lattice Higgs-Yukawa model based on the
Neuberger overlap operator. As a first step towards the eventual determination
of Higgs mass bounds we study the phase diagram of the model analytically in
the large Nf-limit. We present an expression for the effective potential at
tree-level in t... | 0705.2539v2 |
2007-05-21 | ATLAS sensitivity to Wtb anomalous couplings in top quark decays | We study the sensitivity of the ATLAS experiment to Wtb anomalous couplings
in top pair production with semileptonic decay, pp -> t tbar -> W+ b W- bbar,
with one of the W bosons decaying leptonically and the other hadronically.
Several observables are examined, including the W helicity fractions and new
quantities rec... | 0705.3041v2 |
2007-06-18 | Pomeron loop and running coupling effects in high energy QCD evolution | Within the framework of a (1+1)-dimensional model which mimics evolution and
scattering in QCD at high energy, we study the influence of the running of the
coupling on the high-energy dynamics with Pomeron loops. We find that the
particle number fluctuations are strongly suppressed by the running of the
coupling, by at... | 0706.2540v1 |
2007-07-18 | Photoinduced melting of charge order in a quarter-filled electron system coupled with different types of phonons | Photoinduced melting of charge order is calculated by using the exact
many-electron wave function coupled with classically treated phonons in the
one-dimensional quarter-filled Hubbard model with Peierls and Holstein types of
electron-phonon couplings. The model parameters are taken from recent
experiments on (EDO-TTF)... | 0707.2619v1 |
2007-07-23 | The multiple effects of gradient coupling on network synchronization | Recent studies have shown that synchronizability of complex networks can be
significantly improved by asymmetric couplings, and increase of coupling
gradient is always in favor of network synchronization. Here we argue and
demonstrate that, for typical complex networks, there usually exists an optimal
coupling gradient... | 0707.3353v1 |
2007-07-25 | Coupled-mode equations and gap solitons in a two-dimensional nonlinear elliptic problem with a separable periodic potential | We address a two-dimensional nonlinear elliptic problem with a
finite-amplitude periodic potential. For a class of separable symmetric
potentials, we study the bifurcation of the first band gap in the spectrum of
the linear Schr\"{o}dinger operator and the relevant coupled-mode equations to
describe this bifurcation. T... | 0707.3731v2 |
2007-07-30 | Tests of non-standard electroweak couplings of right-handed quarks | The standard model can be interpreted as the leading order of a Low-Energy
Effective Theory (LEET) invariant under a higher non linearly realized symmetry
$S_{nat}\supset SU(2)_W \times U(1)_Y$ equipped with a systematic power
counting. Within the minimal version of this ``not quite decoupling'' LEET, the
dominant non-... | 0707.4194v2 |
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