publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2023-08-03 | Tuning of resonant doublets in coupled optical cavities | The mode profile of a coupled optical cavity often exhibits a resonant
doublet, which arises from the strong coupling between its sub-cavities.
Traditional readout methods rely on setting fields of different frequencies to
be resonant in either sub-cavity, which is challenging in the case of strong
coupling. In this re... | 2308.02574v1 |
2023-08-08 | Vibrational coupling to quasi-bound states in the continuum under tailored coupling conditions | Photonic resonance modes can be spectrally coupled to the vibrational modes
of molecules in the mid-infrared regime through interactions between localized
electric fields and nearby molecules. According to recent studies, radiative
loss engineering of coupled systems is a promising approach for tailoring
coupling condi... | 2308.04630v1 |
2023-09-11 | Topological transitions in dissipatively coupled Su-Schrieffer-Heeger models | Non-Hermitian topological phenomena have gained much interest among
physicists in recent years. In this paper, we expound on the physics of
dissipatively coupled Su-Schrieffer-Heeger (SSH) lattices, specifically in
systems with bosonic and electrical constituents. In the context of electrical
circuits, we demonstrate t... | 2309.05479v1 |
2023-09-14 | Coupling Constants as Conserved Charges in Black Hole Thermodynamics | In a generic theory of gravity coupled to matter fields, the Smarr formula
and the first law of thermodynamics of black holes do not work properly if the
contributions of the coupling constants defining the theory are not
incorporated. However, these couplings, such as the cosmological constant or
the dimensionful para... | 2309.07634v1 |
2023-10-10 | Kerr black hole shadows from the axion-photon coupling | We have investigated the motion for photons in the Kerr black hole spacetime
under the axion-photon coupling. The birefringence phenomena arising from the
axion-photon coupling can be negligible in the weak coupling approximation
because the leading-order contributions to the equations of motion come from
the square te... | 2310.06490v3 |
2023-10-24 | String breaking and running coupling of $\rm Q\bar{Q}$ in a rotating media from holography | Through gravity/gauge duality, the string breaking and running coupling
constant of heavy quark-antiquark pair are investigated in the rotating
background. For the meson decay mode $\rm Q\bar{Q} \rightarrow Q
\bar{q}+\bar{Q} q$, we discuss the string breaking and running coupling in the
parallel and transverse case. It... | 2310.15609v1 |
2023-11-07 | Non-Hermitian skin effect and nonreciprocity induced by dissipative couplings | We study the mechanism for realizing non-Hermitian skin effect (NHSE) via
dissipative couplings, in which the left-right couplings have equal strengths
but the phases do not satisfy the complex conjugation. Previous realizations of
NHSE typically require unequal left-right couplings or on-site gain and loss.
In this wo... | 2311.03803v2 |
2023-12-07 | Stiff deployable structures via coupling of thick Miura-ori tubes along creases | Origami-based structures play an important role in the realization of
deployable mechanisms and unique mechanical properties via programmable
deformation by folding. Among origami-based structures, tessellation by the
coupling of origami tubes enriches the variations in geometry and mechanical
properties. However, thic... | 2312.04048v1 |
2023-12-27 | Topological phase transitions induced by the variation of exchange couplings in graphene | We consider a modified graphene model under exchange couplings. Various
quantum anomalous phases are known to emerge under uniform or staggered
exchange couplings. We introduce the twist between the orientations of two
sublattice exchange couplings, which is useful for examining how such
topologically nontrivial phases... | 2312.16625v2 |
2024-01-19 | Extremely strong spin-orbit coupling effect in light element altermagnetic materials | Spin-orbit coupling is a key to realize many novel physical effects in
condensed matter physics, but the mechanism to achieve strong spin-orbit
coupling effect in light element antiferromagnetic compounds has not been
explored. In this work, based on symmetry analysis and the first-principles
electronic structure calcu... | 2401.11065v1 |
2024-02-14 | Sign of the $hZZ$ coupling and implication for new physics | The magnitudes of the couplings of the scalar resonance at 125 GeV with the
SM particles are found to be consistent with those of the SM Higgs boson.
However, the signs are not experimentally determined in most of the cases, a
prime example being that with the $Z$-boson pair. In other words, $\kappa_Z^h$,
the ratio of ... | 2402.09352v1 |
2024-04-08 | Linear and Nonlinear Coupling of Twin-Resonators with Kerr Nonlinearity | Nonlinear effects in microresonators are efficient building blocks for
all-optical computing and telecom systems. With the latest advances in
microfabrication, coupled microresonators are used in a rapidly growing number
of applications. In this work, we investigate the coupling between
twin-resonators in the presence ... | 2404.05646v1 |
1999-04-09 | Scaling solutions in general non-minimal coupling theories | A class of generalized non-minimal coupling theories is investigated, in
search of scaling attractors able to provide an accelerated expansion at the
present time. Solutions are found in the strong coupling regime and when the
coupling function and the potential verify a simple relation. In such cases,
which include po... | 9904120v1 |
2005-02-19 | Quintessence models of Dark Energy with non-minimal coupling | We explore quintessence models of dark energy which exhibit non-minimal
coupling between the dark matter and the dark energy components of the cosmic
fluid. The kind of coupling chosen is inspired in scalar-tensor theories of
gravity. We impose a suitable dynamics of the expansion allowing to derive
exact Friedmann-Rob... | 0502383v1 |
2005-09-02 | A toy model for coupling accretion disk oscillations to the neutron star spin | Lee, Abramowicz & Kluzniak (2004) demonstrated numerically that rotation of
neutron star couples with oscillations of its accretion disk, and excites
resonances. No specific coupling was assumed, but magnetic field was suggested
as the most likely one. Following this idea, we show (Petri 2005) that if the
neutron star ... | 0509047v1 |
1998-01-07 | Driven Maps and the Emergence of Ordered Collective Behavior in Globally Coupled Maps | A method to predict the emergence of different kinds of ordered collective
behaviors in systems of globally coupled chaotic maps is proposed. The method
is based on the analogy between globally coupled maps and a map subjected to an
external drive. A vector field which results from this analogy appears to
govern the tr... | 9801005v1 |
1993-08-20 | Phase separation and pairing in coupled chains and planes | A generalization of the $t-J$ model in a system of two coupled chains or
planes is studied by numerical diagonalization of small clusters. In
particular, the effect of density fluctuations between these one- or
two-dimensional coupled layerson intralayer phase separation and pairing is
analyzed. The most robust signals... | 9308028v2 |
1994-10-10 | Effective chiral-spin Hamiltonian for odd-numbered coupled Heisenberg chains | An $L \times \infty$ system of odd number of coupled Heisenberg spin chains
is studied using a degenerate perturbation theory, where $L$ is the number of
coupled chains. An effective chain Hamiltonian is derived explicitly in terms
of two spin half degrees of freedom of a closed chain of $L$ sites, valid in
the regime ... | 9410030v1 |
1997-03-20 | Complex-Temperature Phase Diagrams of 1D Spin Models with Next-Nearest-Neighbor Couplings | We study the dependence of complex-temperature phase diagrams on details of
the Hamiltonian, focusing on the effect of non-nearest-neighbor spin-spin
couplings. For this purpose, we consider a simple exactly solvable model, the
1D Ising model with nearest-neighbor (NN) and next-to-nearest-neighbor (NNN)
couplings. We w... | 9703187v1 |
1998-02-13 | Antiferromagnetic interlayer exchange coupling across an amorphous metallic spacer layer | By means of magneto-optical Kerr effect we observe for the first time
antiferromagnetic coupling between ferromagnetic layers across an amorphous
metallic spacer layer. Biquadratic coupling occurs at the transition from a
ferromagnetically to an antiferromagnetically coupled region. Scanning
tunneling microscopy images... | 9802148v1 |
1998-04-20 | Crossover from Weak- to Strong-Coupling Superconductivity and to Normal State with Pseudogap | For an electron gas with a $ \delta $-function attraction we investigate the
crossover from weak-coupling to strong-coupling superconductivity as well as
normal state near the temperature $T^*$, at which the strong coupling produces
a pseudogap in the energy spectrum due to the binding of electron pairs. We
present cur... | 9804206v3 |
1998-10-16 | Coupling of intrinsic Josephson oscillations in layered superconductors by charge fluctuations | The coupling of Josephson oscillations in layered superconductors is studied
with help of a tunneling Hamiltonian formalism. The general form of the current
density across the barriers between the superconducting layers is derived. The
induced charge fluctuations on the superconducting layers lead to a coupling of
the ... | 9810192v1 |
1998-10-30 | The Markov approximation for the atomic output coupler | The regions of validity of the Markov approximation for the coupling of atoms
out of an atomic trap are determined. We consider radio-frequency output
coupling in the presence of gravity and collisional repulsion, and Raman output
coupling. The Markov approximation is crucial in most theoretical descriptions
of an atom... | 9810413v1 |
1998-11-02 | Transport in Double-Crossed Luttinger Liquids | We study transport through two Luttinger liquids (one-dimensional electrons
interacting through a Coulomb repulsion in a metal) coupled together at {\it
two} points. External voltage biases are incorporated through boundary
conditions. We include density-density couplings as well as single-particle
hops at the contacts... | 9811011v1 |
1999-04-15 | Frictional Drag Between Coupled 2D Hole Gases in GaAs/AlGaAs Heterostructures | We report on the first measurements of the drag effect between coupled
2D-hole gases. We investigate the coupling by changing the carrier densities in
the quantum wells, the widths of the barriers between the gases and the
perpendicular magnetic field. From the data we are able to attribute the
frictional drag to phono... | 9904214v1 |
1999-05-11 | Dynamics of a Ring of Diffusively Coupled Lorenz Oscillators | We study the dynamics of a finite chain of diffusively coupled Lorenz
oscillators with periodic boundary conditions. Such rings possess infinitely
many fixed states, some of which are observed to be stable. It is shown that
there exists a stable fixed state in arbitrarily large rings for a fixed
coupling strength. This... | 9905140v1 |
1999-09-18 | Universal Scaling of Wave Propagation Failure in Arrays of Coupled Nonlinear Cells | We study the onset of the propagation failure of wave fronts in systems of
coupled cells. We introduce a new method to analyze the scaling of the critical
external field at which fronts cease to propagate, as a function of
intercellular coupling. We find the universal scaling of the field throughout
the range of coupli... | 9909273v1 |
2000-02-16 | The effect of Hund's Coupling on one-dimensional Luttinger Liquids | Two one-dimensional Luttinger liquid systems coupled by Hund's coupling are
studied by the renormalization group and the non-abelian bosonization methods.
It is found that the Hund's coupling is always relevant irrespective of the
repulsive interaction between electrons within each chain.
The properties of the result... | 0002231v1 |
2000-02-18 | Many-body CPA for the Holstein-DE model | A many-body coherent potential approximation (CPA) previously developed for
the double exchange (DE) model is extended to include coupling to local quantum
phonons. The Holstein-DE model studied (equal to the Holstein model for zero
Hund coupling) is considered to be a simple model for the colossal
magnetoresistance ma... | 0002297v1 |
2000-02-21 | New way to achieve chaotic synchronization in spatially extended systems | We study the spatio-temporal behavior of simple coupled map lattices with
periodic boundary conditions. The local dynamics is governed by two maps,
namely, the sine circle map and the logistic map respectively. It is found that
even though the spatial behavior is irregular for the regularly coupled
(nearest neighbor co... | 0002315v1 |
2000-03-27 | Intertube coupling in ropes of single-wall carbon nanotubes | We investigate the coupling between individual tubes in a rope of single-wall
carbon nanotubes using four probe resistance measurements. By introducing
defects through the controlled sputtering of the rope we generate a strong
non-monotonic temperature dependence of the four terminal resistance. This
behavior reflects ... | 0003423v1 |
2000-11-02 | Coherent coupling of two quantum dots embedded in an Aharonov-Bohm ring | We define two laterally gated small quantum dots (~ 15 electrons) in an
Aharonov-Bohm geometry in which the coupling between the two dots can be
broadly changed. For weakly coupled quantum dots we find Aharonov-Bohm
oscillations. In an intermediate coupling regime we concentrate on the
molecular states of the double do... | 0011044v1 |
2001-06-21 | Quantum field effects in coupled atomic and molecular Bose-Einstein condensates | This paper examines the parameter regimes in which coupled atomic and
molecular Bose-Einstein condensates do not obey the Gross-Pitaevskii equation.
Stochastic field equations for coupled atomic and molecular condensates are
derived using the functional positive-P representation. These equations
describe the full quant... | 0106427v1 |
2001-12-04 | Coupled Growing Networks | We introduce and solve a model which considers two coupled networks growing
simultaneously. The dynamics of the networks is governed by the new arrival of
network elements (nodes) making preferential attachments to pre-existing nodes
in both networks. The model segregates the links in the networks as
intra-links, cross... | 0112052v2 |
2002-08-20 | Soliton Fermi sea in models of Ising-coupled Kondo impurities | We study a model of Ising-coupled Kondo impurities that can be applied to
quantum dots with capacitance coupling, coupled qubits with an incoherent
environment, etc. We show that this model becomes equivalent to a Anderson
impurity model with a novel solitonic Fermi sea. We derive exact results at the
Toulouse point, a... | 0208390v2 |
2002-10-17 | Frustration of the interlayer coupling by mobile holes in La2-xSrxCuO4 (x<0.02) | We have studied the interlayer coupling in the antiferromagnetic (AF) phase
of Sr and Zn doped La2CuO4 by analyzing the spin flip transition in the
magnetization curves. We find that the interlayer coupling strongly depends on
the mobility of the hole charge carriers. Samples with the same hole content as
well as the s... | 0210357v1 |
2003-04-07 | Variable electrostatic transformer: controllable coupling of two charge qubits | We propose and investigate a novel method for the controlled coupling of two
Josephson charge qubits by means of a variable electrostatic transformer. The
value of the coupling capacitance is given by the discretized curvature of the
lowest energy band of a Josephson junction, which can be positive, negative, or
zero. ... | 0304166v2 |
2003-08-10 | Spectroscopy on two coupled flux qubits | We have performed spectroscopy measurements on two coupled flux qubits. The
qubits are coupled inductively, which results in a $\sigma_1^z\sigma_2^z$
interaction. By applying microwave radiation, we observe resonances due to
transitions from the ground state to the first two excited states. From the
position of these r... | 0308192v1 |
2003-10-01 | Rashba coupling in quantum dots: exact solution | We present an analytic solution to the problem of the Rashba spin-orbit
coupling in semiconductor quantum dots. We calculate the exact energy spectrum,
wave-functions, and spin--flip relaxation times. We discuss various effects
inaccessible via perturbation theory. In particular, we find that the effective
gyromagnetic... | 0310024v2 |
2004-06-27 | Spin transfer and coherence in coupled quantum wells | Spin dynamics of optically excited electrons confined in asymmetric coupled
quantum wells are investigated through time resolved Faraday rotation
experiments. The inter-well coupling is shown to depend on applied electric
field and barrier thickness. We observe three coupling regimes: independent
spin precession in iso... | 0406668v1 |
2005-01-11 | Nonlinear Coupling in Nb/NbN Superconducting Microwave Resonators | In this experimental study we show that the coupling between Nb/NbN
superconducting microwave resonators and their feedline can be made amplitude
dependent. We employ this mechanism to tune the resonators into critical
coupling condition, a preferable mode of operation for a wide range of
applications. Moreover we exam... | 0501236v1 |
2005-01-20 | Computing Counterion Densities at Intermediate Coupling | By decomposing the Coulomb interaction into a long distance component
appropriate for mean-field theory, and a nonmean-field short distance
component, we compute the counterion density near a charged surface for all
values of the counterion coupling parameter. A modified strong-coupling
expansion that is manifestly fin... | 0501498v1 |
2005-02-14 | Interlayer Exchange Coupling in (Ga,Mn)As-based Superlattices | The interlayer coupling between (Ga,Mn)As ferromagnetic layers in
all-semiconductor superlattices is studied theoretically within a tight-binding
model, which takes into account the crystal, band and magnetic structure of the
constituent superlattice components. It is shown that the mechanism originally
introduced to d... | 0502321v1 |
2005-02-22 | Dynamics of weakly coupled random antiferromagnetic quantum spin chains | We study the low-energy collective excitations and dynamical response
functions of weakly coupled random antiferromagnetic spin-1/2 chains. The
interchain coupling leads to Neel order at low temperatures. We use the
real-space renormalization group technique to tackle the intrachain couplings
and treat the interchain c... | 0502530v2 |
2005-03-03 | Finite-temperature properties of frustrated classical spins coupled to the lattice | We present extensive Monte Carlo simulations for a classical
antiferromagnetic Heisenberg model with both nearest ($J_1$) and next-nearest
($J_2$) exchange couplings on the square lattice coupled to the lattice degrees
of freedom. The Ising-like phase transition, that appears for $J_2/J_1>1/2$ in
the pure spin model, i... | 0503080v1 |
2005-04-11 | Superconducting qubit network with controllable nearest neighbor coupling | We investigate the design and functionality of a network of loop-shaped
charge qubits with switchable nearest-neighbor coupling. The qubit coupling is
achieved by placing large Josephson junctions at the intersections of the qubit
loops and selectively applying bias currents. The network is scalable and makes
it possib... | 0504250v1 |
2005-07-29 | Charge fluctuation induced dephasing of exchange coupled spin qubits | Exchange coupled {\it spin} qubits in semiconductor nanostructures are shown
to be vulnerable to dephasing caused by {\it charge noise} invariably present
in the semiconductor environment. This decoherence of exchange gate by
environmental charge fluctuations arises from the fundamental Coulombic nature
of the Heisenbe... | 0507725v2 |
2005-11-10 | Do current-density nonlinearities cut off the glass transition? | Extended mode coupling theories for dense fluids predict that nonlinear
current-density couplings cut off the singular `ideal glass transition',
present in the standard mode coupling theory where such couplings are ignored.
We suggest here that, rather than allowing for activated processes as sometimes
supposed, contri... | 0511260v1 |
2005-11-16 | Mode-Coupling Theory (MCT) Lecture Notes | In this set of lecture notes we review the mode-coupling theory of the glass
transition from several perspectives. First, we derive mode-coupling equations
for the description of density fluctuations from microscopic considerations
with the use the Mori-Zwanzig projection operator technique. We also derive
schematic mo... | 0511407v1 |
2006-02-03 | Tunable coupling of qubits: nonadiabatic corrections | We analyze the coupling of qubits mediated by a tunable and fast element
beyond the adiabatic approximation. The nonadiabatic corrections are important
and even dominant in parts of the relevant parameter range. As an example, we
consider the tunable capacitive coupling between two charge qubits mediated by
a gated Jos... | 0602086v2 |
2006-04-19 | Vibronic solitons in a (nearly-) degenerate electronic system along a 1-D chain | We consider the formation and stability of the vibronic polaron arising in a
degenerate or nearly degenerate electronic system coupled to an appropriate
vibrational mode. We define the electron-phonon coupling as a mixing of the
electronic states by the phonon mode. Our investigation is similar to that
carried out rece... | 0604462v1 |
2006-05-28 | Generalized switchable coupling for superconducting qubits using double resonance | We propose a method for switchable coupling between superconducting qubits
using double resonance. The inter-qubit coupling is achieved by applying
near-resonant oscillating fields to the two qubits. The deviation from
resonance relaxes the criterion of strong driving fields while still allowing
for a fully entangling ... | 0605685v2 |
2006-06-22 | Better synchronizability predicted by a new coupling method | In this paper, inspired by the idea that the hub nodes of a highly
heterogeneous network are not only the bottlenecks, but also effective
controllers in the network synchronizing process, we bring forward an
asymmetrical coupling method where the coupling strength of each node depends
on its neighbors' degrees. Compare... | 0606575v2 |
2006-12-29 | Experimental Observation of Electronic Coupling in GaAs Lateral Quantum Dot Molecules | We report the fabrication and photoluminescence properties of
laterally-coupled GaAs/AlGaAs quantum dots. The coupling in the quantum dot
molecules is tuned by an external electric field. An intricate behavior,
consisting of spectral line crossings and avoided crossings is observed for
different molecules. Anticrossing... | 0612701v3 |
2007-01-09 | Artificial molecular quantum rings: Spin density functional theory calculations | The ground states of artificial molecules made of two vertically coupled
quantum rings are studied within the spin density functional theory for systems
containing up to 13 electrons. Quantum tunneling effects on the electronic
structure of the coupled rings are analyzed. For small ring radius, our results
recover thos... | 0701185v1 |
2006-11-24 | Coupling Methodology within the Software Platform Alliances | CEA, ANDRA and EDF are jointly developing the software platform ALLIANCES
which aim is to produce a tool for the simulation of nuclear waste storage and
disposal repository. This type of simulations deals with highly coupled
thermo-hydro-mechanical and chemical (T-H-M-C) processes. A key objective of
Alliances is to gi... | 0611127v1 |
1998-07-23 | Does the non-minimal coupling of the scalar field improve or destroy inflation ? | The non-minimal coupling of a scalar field to the Ricci curvature in a curved
spacetime is unavoidable according to several authors. The coupling constant is
not a free parameter: the prescriptions for the value of the coupling constant
in specific scalar field and gravity theories (in particular in general
relativity)... | 9807066v1 |
2004-09-10 | A Nonlinear Coupling Network to Simulate the Development of the r-mode Instablility in Neutron Stars I. Construction | R-modes of a rotating neutron star are unstable because of the emission of
gravitational radiation. We explore the saturation amplitudes of these modes
determined by nonlinear mode-mode coupling. Modelling the star as
incompressible allows the analytic computation of the coupling coefficients.
All couplings up to n=30 ... | 0409048v1 |
2006-10-24 | Duffin-Kemmer-Petiau equation with nonminimal coupling to curvature | The generalized Duffin-Kemmer-Petiau equation in curved space-time is
proposed for non-minimal coupling to the curvature and external fields. The
corresponding scalar and vector fields equation are found. Equations are
presented, which are equivalent to those of a scalar field with conformal
coupling and electromagneti... | 0610115v1 |
2001-02-22 | Measurement of the leptoquark Yukawa couplings in e+e- collisions at TESLA | Measurement of the Yukawa couplings of the first-generation leptoquarks has
been studied for e+e- collisions at TESLA, at sqrt(s)=800 GeV. By combining
measurements from different production and decay channels, determination of
Yukawa couplings with precision on the few per-cent level is possible. TESLA
will be sensiti... | 0102043v1 |
1995-03-30 | Effective Yukawa Couplings in Noncompact Lattice QED | We investigate effective Yukawa couplings of mesons to the elementary
fermions in noncompact lattice QED. The couplings are extracted from suitable
fermion-antifermion-meson three-point functions calculated by Monte Carlo
simulations with dynamical staggered fermions. The scaling behaviour is
compatible with expectatio... | 9503026v1 |
2005-10-04 | Pionic couplings (g^ and g~) in the static heavy quark limit | The couplings between the soft pion and the doublet of heavy-light mesons are
basic parameters of the ChPT approach to the heavy-light systems. We compute
the unquenched (Nf=2) values of two such couplings in the static heavy quark
limit: (1) g^, coupling to the lowest doublet of heavy-light mesons, and (2)
g~, couplin... | 0510017v1 |
1993-06-02 | Coupling Constant and Yukawa Coupling Unifications: Uncertainties and Constraints | The status of coupling constant unification (with and without a unification
of Yukawa couplings) is discussed. Uncertainties associated with the input
coupling constants, $m_{b}$ and $m_{t}$, threshold corrections at the low and
high scale, and possible nonrenormalizable operators are described and a
discrepancy betwee... | 9306213v1 |
1994-05-02 | About the relevance of the Imaginary components of the effective couplings in the Asymmetry measurements | The effect coming from imaginary parts of effective couplings in the $e^+
e^-$ asymmetries is investigated. It is shown that for the present level of
experimental accuracy, in some asymmetries the imaginary parts of the effective
couplings cannot be neglected and moreover that the use of different
prescriptions on how ... | 9405201v1 |
1995-03-06 | Threshold Behaviour in Gauge Boson Pair Production at LEP 2 | We discuss the form of the amplitude for gauge boson pair production at or
near threshold.We show that in the case of W-pair production at LEP2 near
threshold only one anomalous electromagnetic coupling can contribute. This
anomalous coupling is CP violating and contributes to the electric dipole
moment of the $W$. Sin... | 9503243v2 |
1995-06-22 | Gauge Coupling Unification in GUT and String Models | The results for the running of the gauge couplings in the MSSM are up-dated
by proper inclusion of all low scale effects. They are presented as predictions
for the strong coupling constant in the scenario with only two parameters at
the GUT scale ~ ($\alpha_{U}$ ~and ~$M_{U}$) ~and as a mismatch of the
couplings at the... | 9506393v1 |
1996-10-10 | Effects of Anomalous Couplings of Quarks on Prompt Photon Production | Prompt photon production is sensitive to the anomalous couplings of gluons to
quarks, because it is mainly produced by quark-gluon scattering. We will
examine the effects of the anomalous chromoelectric and chromomagnetic dipole
moment couplings of quarks on prompt photon production. Using the data
collected by CDF and... | 9610318v1 |
1996-10-29 | Suppression of PiNN(1535) Coupling in the QCD Sum Rule | The \pi NN^* and \eta NN^* coupling constants are studied based on the two
point functions between the vacuum and a one meson state in the soft meson
limit. In terms of a suitably constructed interpolating field for the nucleon
and resonances, we have found that the \pi NN^* couplings vanish, while \eta
NN^* couplings ... | 9610520v2 |
1997-01-31 | Anomalous triple gauge couplings in e+ e- -> W+ W- and "optimal" strategies for their measurement | We show how one can measure anomalous WWZ- and WWgamma-couplings with minimal
statistical error using integrated observables, without having to assume that
the anomalous couplings are small. We propose a parametrisation of these
couplings which is well suited for the extraction of both single and many
parameters, and w... | 9702208v1 |
1997-04-03 | Reduction of Couplings and Finiteness in Realistic Supersymmetric GUTs | Reduction of couplings in supersymmetric GUTs is achieved by searching for
renormalization group invariant (RGI) relations among couplings which hold
beyond the unification scale. Finiteness is due to the fact that there exist
RGI relations among couplings that guarantee the vanishing of the
beta-functions of a N=1 sup... | 9704218v1 |
1997-04-12 | Chaotic inflation with running nonminimal coupling | We have found a successful model of chaotic inflation with an inflaton
coupled nonminimally with gravity. The nonminimal coupling constant $\xi$ runs
with the evolution of the inflaton. The running nature of the coupling leads
naturally to the situations where the coupling becomes small enough to have
sufficient period... | 9704303v2 |
1997-06-18 | Gauge-Boson Pair Production at the LHC: Anomalous Couplings and Vector-Boson Scattering | We compare vector boson fusion and quark antiquark annihilation production of
vector boson pairs at the LHC and include the effects of anomalous couplings.
Results are given for confidence intervals for anomalous couplings at the LHC
assuming that measurements will be in agreement with the standard model. We
consider a... | 9706406v1 |
1997-06-24 | Some Remarks on the Baryon-Meson Couplings in the 1/N_c Expansion | The original results for the baryon-pion couplings in the large $N_c$ QCD can
be understood in a simpler way in the Hartree-Fock picture. The large $N_c$
relation and its $1/N_c$ correction between the heavy baryon-meson coupling and
the light baryon-meson coupling are emphasized. Application to the
baryon-$\rho$ meson... | 9706481v1 |
1997-07-10 | Suppression of PiNN* Coupling and Chiral Symmetry | Meson-baryon couplings between positive and negative parity baryons are
investigated using two point correlation functions in the soft meson limit. We
find that the pi NN^* coupling vanishes due to chiral symmetry, while the eta
NN^* coupling remains finite. We perform an analysis based on the algebraic
method for SU(2... | 9707307v1 |
1998-05-19 | The Anomalous Magnetic Moment of the Muon and Higgs-Mediated Flavor Changing Neutral Currents | In the two-Higgs doublet extension of the standard model, flavor-changing
neutral couplings arise naturally. In the lepton sector, the largest such
coupling is expected to be $\mu-\tau-\phi#. We consider the effects of this
coupling on the anomalous magnetic moment of the muon. The resulting bound on
the coupling, unli... | 9805376v1 |
2000-08-03 | Correspondence of consistent and inconsistent spin-3/2 couplings via the equivalence theorem | The Rarita-Schwinger theory of free massive spin-3/2 field obeys the physical
degrees of freedom counting, and one can distinguish ``consistent'' couplings
which maintain this property and ``inconsistent'' couplings which destroy it.
We show how one can obtain consistent couplings from inconsistent ones by a
redefiniti... | 0008026v2 |
2002-11-08 | Varying Couplings From Orbifold GUTs | We discuss the variation of gauge couplings in time in the framework of
orbifold constructions, due to a change of the extra compact dimension's size.
Models with gauge coupling unification allow to estimate the variation of the
strong coupling constant $\al_3$ and to relate it to a variation of
$\alpha_{em}$. The extr... | 0211122v2 |
2003-11-05 | $H^+ W^- Z$ contribution to the static quantities of the W boson in the context of Higgs-triplet theories | We calculate the one--loop contribution from the $H^+ W^- Z$ coupling to the
static electromagnetic properties of the W boson. Although this coupling is
absent at the tree--level in all Higgs--doublet models, it can be induced at
this order in models including Higgs--triplet representations. It is found that
the $H^+ W... | 0311066v1 |
2004-08-24 | Charges and Coupling Strengths in Gauge Theories with Direct Product Symmetry Groups | For gauge theories with direct product internal symmetry groups, the
relationship between internal quantum numbers (charges) and coupling strengths
is examined. In these types of theories, the Lagrangian density may contain
non-trivial factors multiplying the matter field terms, and these factors can
modify the interac... | 0408266v2 |
2004-09-28 | The Temperature Dependence of the QCD Running Coupling | We study the running of the QCD coupling with the momentum squared ($Q^2$)
and the temperature scales in the high temperature limit ($T > T_{c}$), using a
mass dependent renormalization scheme to build the Renormalization Group
Equations. The approach used guaranty gauge invariance, through the use of the
Hard Thermal ... | 0409329v1 |
2006-04-28 | New Physics effects in the flavor-changing neutral couplings of the Top quark | We survey the flavor-changing neutral couplings (FCNC) of the top quark
predicted by some extensions of the Standard Model: THDM, SUSY, L-R symmetric,
TC2, 331, and models with extra quarks. Since the expected sensitivity of the
LHC and ILC for the tcV (V=\gamma,g,Z) and tcH couplings is of order of a few
percent, we e... | 0605003v1 |
2006-10-23 | Light scalars coupled to photons and non-newtonian forces | A particle $\phi$ coupling to two photons couples also to charged particles,
like protons, through a loop. If the particle is a light scalar this induced
coupling to protons leads to non-newtonian forces. We show that the
experimental constraints on exotic, fifth-type forces lead to stringent
constraints on the $\phi\g... | 0610286v2 |
1993-04-27 | The Strength of String Nonperturbative Effects and Strong-Weak Coupling Duality | A strong-weak coupling duality symmetry of the string equations of motion has
been suggested in the literature. This symmetry implies that vacua occur in
pairs. Since the coupling constant is a dynamical variable in string theory,
tunneling solutions between strong and weak coupling vacua may exist. Such
solutions woul... | 9304129v2 |
1995-03-31 | Nontrivial, Asymptotically Non-free Gauge Theories and Dynamical Unification of Couplings | An evidence for nontriviality of asymptotically non-free (ANF) Yang-Mills
theories is found on the basis of optimized perturbation theory. It is argued
that these theories with matter couplings can be made nontrivial by means of
the reduction of couplings, leading to the idea of dynamical unification of
couplings (DUC)... | 9503221v1 |
1997-01-13 | Strong Coupling Expansions of SU(N) Seiberg-Witten Theory | We set up a systematic expansion of the prepotential for ${\cal N}=2$
supersymmetric Yang-Mills theories with SU(N) gauge group in the region of
strong coupling where a maximal number of mutually local fields become
massless. In particular, we derive the first non-trivial non-perturbative
correction, which is the first... | 9701055v1 |
1997-06-04 | Exponentially Small Couplings between Twisted Fields of Orbifold String Theories | We investigate the natural occurence of exponentially small couplings in
effective field theories deduced from higher dimensional models. We calculate
the coupling between twisted fields of the Z_3 Abelian orbifold
compactification of the heterotic string. Due to the propagation of massive
Kaluza-Klein modes between th... | 9706028v1 |
1998-12-08 | Anomalous couplings for D-branes and O-planes | We study anomalous Wess-Zumino couplings of D-branes and O-planes in a
general background and derive them from a direct string computation by
factorizing in the RR channel various one-loop amplitudes. In particular, we
find that Op-planes present gravitational anomalous couplings involving the
Hirzebruch polynomial L, ... | 9812071v1 |
2004-09-02 | Lagrange Multipliers and Couplings in Supersymmetric Field Theory | In hep-th/0312098 it was argued that by extending the ``$a$-maximization'' of
hep-th/0304128 away from fixed points of the renormalization group, one can
compute the anomalous dimensions of chiral superfields along the flow, and
obtain a better understanding of the irreversibility of RG flow in four
dimensional supersy... | 0409029v1 |
2005-04-04 | Scalar tensor theory of gravity carrying a conserved current | A general scalar-tensor theory of gravity carries a conserved current for a
trace free minimally coupled scalar field, under the condition that the
potential $V(\phi)$ of the nonminimally coupled scalar field is proportional to
the square of the parameter $f(\phi)$ that is coupled with the scalar curvature
$R$. The con... | 0504021v1 |
2007-01-12 | Anomalous U(1)'s, Chern-Simons couplings and the Standard Model | This proceeding is based on hep-th/0605225 and it shows that the most general
anomaly related effective action contains Stuckelberg, axionic and
Chern-Simons-like couplings. Such couplings are generically non-trivial in
orientifold string vacua. A similar analysis in quantum field theories provides
similar couplings. T... | 0701114v2 |
2002-03-08 | Compactification of the moduli spaces of vortices and coupled vortices | Vortices and coupled vortices arise from Yang-Mills-Higgs theories and can be
viewed as generalizations or analogues to Yang-Mills connections and, in
particular, Hermitian-Yang-Mills connections. We proved an analytic
compactification of the moduli spaces of vortices and coupled vortices on
hermitian vector bundles ov... | 0203078v1 |
2004-02-23 | Coupling Poisson and Jacobi structures on foliated manifolds | Let M be a differentiable manifold endowed with a foliation F. A Poisson
structure P on M is F-coupling if the image of the annihilator of TF by the
sharp-morphism defined by P is a normal bundle of the foliation F. This notion
extends Sternberg's coupling symplectic form of a particle in a Yang-Mills
field. In the pre... | 0402361v1 |
2001-01-16 | An Exactly Solvable Model for the Interaction of Linear Waves with Korteweg-de Vries Solitons | Under certain mode-matching conditions, small-amplitude waves can be trapped
by coupling to solitons of nonlinear fields. We present a model for this
phenomenon, consisting of a linear equation coupled to the Korteweg-de Vries
equation. The model has one parameter, a coupling constant. For one value of
the coupling con... | 0101027v1 |
2002-01-17 | Lag time and parameter mismatches in synchronization of unidirectionally coupled chaotic external cavity semiconductor lasers | We report an analysis of synchronization between two unidirectionally coupled
chaotic external cavity master/slave semiconductor lasers with two
characteristic delay times, where the delay time in the coupling is different
from the delay time in the coupled systems themselves. We demonstrate for the
first time that par... | 0201032v1 |
2002-08-07 | Hierarchy of Chaotic maps with an invariant measure and their coupling | Hierarchy of one-parameter families of chaotic maps with an invariant measure
have been introduced, where their appropriate coupling has lead to the
generation of some coupled chaotic maps with an invariant measure. It is shown
that these chaotic maps (also the coupled maps) do not undergo any period
doubling or period... | 0208011v1 |
2005-07-15 | Synchronization of coupled chaotic oscillators as a phase transition | We characterize the synchronization of an array of coupled chaotic elements
as a phase transition where order parameters related to the joint probability
at two sites obey power laws versus the mutual coupling strength; the phase
transition corresponds to a change in the exponent of the power law. Since
these studies a... | 0507030v1 |
2006-01-31 | The Time of Synchronization of Oscillationsin Two Coupled Identical Subsystems | The mechanism of synchronization of oscillations in two identical coupled
flow systems has beenstudied. The time (past the coupling onset) during which a
synchronous oscillation regime is establisheddepends on the oscillation phase
difference between the subsystems. Variation of the coupling parameter leadsto
a change ... | 0601072v1 |
2006-03-27 | Semi-direct sums of Lie algebras and discrete integrable couplings | A relation between semi-direct sums of Lie algebras and integrable couplings
of lattice equations is established, and a practicable way to construct
integrable couplings is further proposed. An application of the resulting
general theory to the generalized Toda spectral problem yields two classes of
integrable coupling... | 0603064v1 |
2006-07-31 | Bifurcation and Chaos in Coupled Periodically Forced Non-identical Duffing Oscillators | We study the bifurcations and the chaotic behaviour of a periodically forced
double-well Duffing oscillator coupled to a single-well Duffing oscillator.
Using the amplitude and the frequency of the driving force as control
parameters, we show that our model presents phenomena which were not observed
in coupled periodic... | 0607074v1 |
2006-10-10 | Isochronal synchrony and bidirectional communication with delay-coupled nonlinear oscillators | We propose a basic mechanism for isochronal synchrony and communication with
mutually delay-coupled chaotic systems. We show that two Ikeda ring oscillators
(IROs), mutually coupled with a propagation delay, synchronize isochronally
when both are symmetrically driven by a third Ikeda oscillator. This
synchronous operat... | 0610024v1 |
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