publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
1997-01-20 | Geometric Entropy and Curvature Coupling in Conical Spaces: zeta Function Approach | The local $\zeta-$function approach is implemented to regularize the natural
path integral definition of the geometric entropy in the large mass black hole
Euclidean manifold. The case of a massless field coupled with the (off-shell)
singular curvature is considered. It is proved that the geometric entropy is
independe... | 9701099v2 |
1997-01-23 | Quantum Affine Symmetry and Scattering Amplitudes of the Imaginary Coupled d_4(3) Affine Toda Field Theory | An exact S-matrix is conjectured for the imaginary coupled d_4(3) affine Toda
field theory, using the U_q(g_2(1)) symmetry. It is shown that this S-matrix is
consistent with the results for the case of real coupling using the
breather-particle correspondence. For q a root of unity it is argued that the
theory can be re... | 9701118v3 |
1997-02-04 | Vortex solutions of a Maxwell-Chern-Simons field coupled to four-fermion theory | We find the static vortex solutions of the model of Maxwell-Chern-Simons
gauge field coupled to a (2+1)-dimensional four-fermion theory. Especially, we
introduce two matter currents coupled to the gauge field minimally: the
electromagnetic current and a topological current associated with the
electromagnetic current. U... | 9702029v1 |
1997-02-06 | Gravitational Dressing of N=2 Sigma-Models Beyond Leading Order | We study the beta-function of the N=2 sigma-model coupled to N=2 induced
supergravity. We compute corrections to first order in the semiclassical limit,
$c \to -\infty$, beyond one-loop in the matter fields. As compared to the
corresponding bosonic, metric sigma-model calculation, we find new types of
contributions ari... | 9702051v1 |
1997-02-17 | Critical Couplings in the Nambu--Jona-Lasinio Model with the Constant Electromagnetic Fields | A detailed analysis is performed for the Nambu--Jona-Lasinio model coupled
with constant (external) magnetic and/or electric fields in two, three, and
four dimensions. The infrared cut-off is essential for a well-defined
functional determinant by means of the proper time method. Contrary to the
previous observation, th... | 9702128v1 |
1997-03-11 | New Couplings of Six-Dimensional Supergravity | We describe the couplings of six-dimensional supergravity, which contain a
self-dual tensor multiplet, to $n_T$ anti-self-dual tensor matter multiplets,
$n_V$ vector multiplets and $n_H$ hypermultiplets. The scalar fields of the
tensor multiplets form a coset $SO(n_T,1)/SO(n_T)$, while the scalars in the
hypermultiplet... | 9703075v1 |
1997-03-19 | Remarks on the Classical Size of D-Branes | We discuss different criteria for `classical size' of extremal Dirichlet
p-branes in type-II supergravity. Using strong-weak coupling duality, we find
that the size of the strong-coupling region at the core of the (p<3)-branes, is
always given by the asymptotic string scale, if measured in the weakly coupled
dual strin... | 9703138v1 |
1997-03-26 | Vortex solutions in axial or chiral coupled non-relativistic spinor- Chern-Simons theory | The interaction of a spin 1/2 particle (described by the non-relativistic
"Dirac" equation of L\'evy-Leblond) with Chern-Simons gauge fields is studied.
It is shown, that similarly to the four dimensional spinor models, there is a
consistent possibility of coupling them also by axial or chiral type currents.
Static sel... | 9703184v1 |
1997-05-05 | A Matrix String Interpretation of the Large N Loop Equation | The existence two S-dual descriptions of (N,1) string bound states suggests
that the strong coupling behaviour of electric flux lines in large N 2D SYM
theory has a dual description in terms of weakly coupled IIB string theory. In
support of this identification, we propose a dual interpretation of the SYM
loop equation... | 9705029v4 |
1997-05-16 | Unitary Matrix Models and Phase Transition | We study the unitary matrix model with a topological term. We call the
topological term the theta term. In the symmetric model there is the phase
transition between the strong and weak coupling regime at $\lambda_{c}=2$. If
the Wilson term is bigger than the theta term, there is the strong-weak
coupling phase transitio... | 9705121v2 |
1997-05-20 | Wilson renormalization group and improved perturbation theory | We discuss a resummed perturbation theory based on the Wilson renormalization
group. In this formulation the Wilsonian flowing couplings, which generalize
the running coupling, enter directly into the loop expansion. In the case of an
asymptotically free theory the flowing coupling is well defined since the
infrared La... | 9705146v1 |
1997-06-13 | Superstring dominated early universe and epoch dependent gauge coupling | We have explored the possibility that the universe at very early stage was
dominated by (macroscopic) heterotic strings. We have found that the
dimensionless parameter $G\mu$ for the heterotic strings varies from $10^{-2}$
to $10^{-4}$ as the universe evolve from the matter dominance to radiation
dominance. This led to... | 9706104v1 |
1997-07-03 | Hawking Radiation for Non-minimally Coupled Matter from Generalized 2D Black Hole Models | It is well known that spherically symmetric reduction of General Relativity
(SSG) leads to non-minimally coupled scalar matter. We generalize (and correct)
recent results to Hawking radiation for a class of dilaton models which share
with the Schwarzschild black hole non-minimal coupling of scalar fields and the
basic ... | 9707041v1 |
1997-11-25 | On the equivalence of the self-dual and Maxwell-Chern-Simons models coupled to Fermions | We study the exact equivalence between the self-dual model minimally coupled
with a Dirac field and the Maxwell-Chern-Simons model with non-minimal magnetic
coupling to fermions. We show that the fermion sectors of the models are
equivalent only if a Thirring like interaction is included. Using functional
methods we ve... | 9711184v1 |
1998-01-09 | Conformal anomaly for dilaton coupled electromagnetic field | The derivation of the conformal anomaly for dilaton coupled electromagnetic
field in curved space is presented. The models of this sort naturally appear in
stringy gravity or after spherical reduction of multidimensional
Einstein-Maxwell theory. It is shown that unlike the case of minimal vector in
curved space or dila... | 9801052v1 |
1998-01-29 | The superspace geometry of gravitational Chern-Simons forms and their couplings to linear multiplets : a review | The superspace geometry of Chern-Simons forms is shown to be closely related
to that of the 3-form multiplet. This observation allows to simplify
considerably the geometric structure of supersymmetric Chern-Simons forms and
their coupling to linear multiplets. The analysis is carried through in U_K(1)
superspace, relev... | 9801201v1 |
1998-02-05 | Matrix string interactions | String configurations have been identified in compactified Matrix theory at
vanishing string coupling. We show how the interactions of these strings are
determined by the Yang-Mills gauge field on the worldsheet. At finite string
coupling, this suggests the underlying dynamics is not well-approximated as a
theory of st... | 9802034v2 |
1998-03-06 | A New Class of Integrable Models of 1+1 Dimensional Dilaton Gravity Coupled to Scalar Matter | Integrable models of 1+1 dimensional gravity coupled to scalar and vector
fields are briefly reviewed. A new class of integrable models with nonminimal
coupling to scalar fields is constructed and discussed. | 9803059v1 |
1998-03-18 | Type IIB $R^4 H^{4g-4}$ Conjectures | We propose $SL(2,Z)$ (and $SL(3,Z)$) invariant conjectures for all $R^4
H^{4g-4}$ couplings of Type IIB strings on $R^{10}$ (and $R^{8}\times T^2$),
generalizing conjectures of Green and Gutperle (and Kiritsis and Pioline) for
the $R^4$ coupling. A strong check for our conjectures is that on $T^2$ at weak
coupling, the... | 9803145v2 |
1998-03-23 | Charged Particles in a 2+1 Curved Background | The coupling to a 2+1 background geometry of a quantized charged test
particle in a strong magnetic field is analyzed. Canonical operators adapting
to the fast and slow freedoms produce a natural expansion in the inverse square
root of the magnetic field strength. The fast freedom is solved to the second
order.
At an... | 9803187v1 |
1998-03-24 | Stable Non-BPS States in String Theory | Many string theories contain states which are not BPS, but are stable due to
charge conservation. In many cases the description of these states in the
strong coupling limit remains unknown despite the existence of a weakly coupled
dual theory. However, we show that in some cases duality symmetries in string
theory do e... | 9803194v2 |
1998-04-04 | S-duality and Strong Coupling Behavior of Large N Gauge Theories with N=4 Supersymmetry | We analyze the strong coupling behavior of the large N gauge theories in
4-dimensions with N=4 supersymmetry by making use of S-duality. We show that at
large values of the coupling constant $\lambda=g_{YM}^2N$ the j-th non-planar
amplitude $f_j(\lambda) (j=0,1,2 ...)$ behaves as $f_j(\lambda)\approx
\lambda^j$. Implic... | 9804037v1 |
1998-04-29 | Renormalisation Group Improved Thermal Coupling Constant In An External Field | Starting from renormalised Effective Lagrangian, in the presence of an
external Chromo-Electric field at finite temperature, the expression for
thermal coupling constant ($\alpha = (g^2)/(4 \pi)$) as a function of
temperature and external field is derived, using finite temperature two
parameter renormalisation group eq... | 9804195v1 |
1998-06-29 | The Nonperturbative Gauge Coupling of N=2 Supersymmetric Theories | We argue that the topology of the quantum coupling space and the low energy
effective action on the Coulomb branch of scale invariant N=2 SU(n) gauge
theories pick out a preferred nonperturbative definition of the gauge coupling
up to non-singular holomorphic reparametrizations. | 9806234v2 |
1998-07-10 | Pseudo-anomalous U(1) symmetry in the strong coupling limit of the heterotic string | We discuss, in the context of the strongly coupled E_8 \times E_8 heterotic
string proposed by Horava and Witten, the appearance of anomalous U(1)_X
symmetries of a nonperturbative origin, related to the presence, after
compactification, of five-branes in the five-dimensional bulk of the theory. We
compute the gauge an... | 9807079v1 |
1998-08-12 | Anomalous D-brane and orientifold couplings from the boundary state | We compute scattering amplitudes involving both R-R and NS-NS fields in the
presence of a D-brane or orientifold plane. These provide direct evidence for
the anomalous couplings in the D-brane and orientifold actions. The D9-brane
and O9-plane are found to couple to the first Pontrjagin class with the
expected relative... | 9808074v3 |
1998-09-19 | The Auxiliary Field Method as a Powerful Tool for Nonperturbative Study | The auxiliary field method, defined through introducing an auxiliary (also
called as the Hubbard-Stratonovich or the Mean-) field and utilizing a
loop-expansion, gives an excellent result for a wide range of a coupling
constant. The analysis is made for Anharmonic-Oscillator and Double-Well
examples in 0-(a simple inte... | 9809141v1 |
1998-10-01 | Conformal Anomaly for Dilaton Coupled Theories from AdS/CFT Correspondence | Trace anomaly for dilaton coupled conformal theories on curved background
with non-zero dilaton is found from supergravity side as an IR effect using
AdS/CFT correspondence. For $d=2$ it coincides with the conformal anomaly for
dilaton coupled scalar (up to total derivative term which is known to be
ambiguous). In four... | 9810008v1 |
1998-10-14 | The Perturbative Gross Neveu Model Coupled to a Chern-Simons Field: A Renormalization Group Study | In 2+1 dimensions, for low momenta, using dimensional renormalization we
study the effect of a Chern-Simons field on the perturbative expansion of
fermions self interacting through a Gross Neveu coupling. For the case of just
one fermion field, we verify that the dimension of operators of canonical
dimension lower than... | 9810106v1 |
1999-01-27 | General massive gauge theory | The concept of perturbative gauge invariance formulated exclusively by means
of asymptotic fields is used to construct massive gauge theories. We consider
the interactions of $r$ massive and $s$ massless gauge fields together with
$(r+s)$ fermionic ghost and anti-ghost fields. First order gauge invariance
requires the ... | 9901140v1 |
1999-02-04 | Strongly Coupled Lattice Gauge Theories and Antiferromagnetic Spin Systems | In this thesis, I use the strong coupling expansion to investigate the
multiflavor lattice Schwinger models in the hamiltonian formalism using
staggered fermions. In particular, I am interested in analysing the mapping of
these gauge theories onto quantum spin-1/2 antiferromagnetic Heisenberg chains.
Exploting this map... | 9902036v1 |
1999-04-02 | A new perspective on matter coupling in 2d quantum gravity | We provide compelling evidence that a previously introduced model of
non-perturbative 2d Lorentzian quantum gravity exhibits (two-dimensional)
flat-space behaviour when coupled to Ising spins. The evidence comes from both
a high-temperature expansion and from Monte Carlo simulations of the combined
gravity-matter syste... | 9904012v1 |
1999-04-06 | Running gauge coupling and quark-antiquark potential from dilatonic gravity | The running gauge coupling and quark-antiquark potential in d-dimensions are
calculated from the explicit solution of d+1-dimensional dilatonic gravity.
This background interpolates between usual AdS in UV and flat space with
singular dilaton in IR and it realizes two-boundaries AdS/CFT correspondence.
The behaviour of... | 9904036v3 |
1999-05-14 | Propagating Torsion in 3D-Gravity and Dynamical Mass Generation | In this paper, fermions are minimally coupled to 3D-gravity where a dynamical
torsion is introduced. A Kalb-Ramond field is non-minimally coupled to these
fermions in a gauge-invariant way. We show that a 1-loop mass generation
mechanism takes place for both the 2-form gauge field and the torsion. As for
the fermions, ... | 9905110v3 |
1999-07-29 | Gravitational Couplings, Orientifolds and M-Planes | We examine string-theory orientifold planes of various types including the Sp
and SO-odd planes, and deduce the gravitational Chern-Simons couplings on their
world-volumes. Consistency checks are carried out in different spacetime
dimensions using various dualities, including those relating string theory with
F-theory ... | 9907215v2 |
1999-08-04 | Large N corrections to the strong coupling behaviour of SU(N)/Z_N lattice gauge theories | We derive a formula for the large N behaviour of the expectation values of an
arbitrary product of Wilson loops in the adjoint representation. We show the
consequences of our formula for the study of the large N strong coupling
behaviour of SU(N)/Z_N pure gauge theories, and theories with matter fields in
the adjoint r... | 9908026v1 |
1999-08-12 | Values of the Couplings and Internal Geometry | In this note we display an observation about the geometrical properties of
the gauge group manifold of the standard electroweak theory, and the values of
the gauge coupling constants. Heuristically obtained stucture relates the value
137.036... to the low energy U(1) coupling. The constuction resembles
techniques recen... | 9908086v1 |
1999-09-15 | Oscillating Inflation with a non-minimally coupled scalar field | The oscillating inflation model recently proposed by Damour and Mukhanov is
investigated with a non-minimal coupling. Numerical study confirms an
inflationary behavior and the density perturbation is obtained. A successful
inflation requires the gravity-dilaton coupling to be small. | 9909106v1 |
1999-09-20 | Hawking Radiation in the Dilaton Gravity with a Non-Minimally Coupled Scalar Field | We discuss the two-dimensional dilaton gravity with a scalar field as the
source matter where the coupling with the gravity is given, besides the minimal
one, through an external field. This coupling generalizes the conformal anomaly
in the same way as those found in recent literature, but with a diferent
motivation. T... | 9909138v1 |
1999-09-23 | Parametric holomorphy? Triviality versus Duality in Sinh-Gordon | Suppose a regularised functional integral depends holomorphically on a
parameter that receives only a finite renormalization. Can one expect the
correlation functions to retain the analyticity in the parameter after removal
of the cutoff(s)? We examine the issue in the Sinh-Gordon theory by computing
the intrinsic 4-po... | 9909170v2 |
1999-10-15 | Renormalization of QCD Coupling Constant in Terms of Physical Quantities | A renormalization scheme is suggested where QCD input parameters - quark mass
and coupling constant - are expressed in terms of gauge invariant and infrared
stable quantities. For the renormalization of coupling constant the quark
anomalous electromagnetic moment is used; the latter is calculated in a two
loop approxim... | 9910120v1 |
1999-10-15 | New S-dualities in N=2 supersymmetric SU(2) x SU(2) gauge theory | New S-dualities in a scale invariant N=2 gauge theory with SU(2) x SU(2)
gauge group are derived from embeddings of the theory in two different larger
asymptotically free theories. The true coupling space of the scale invariant
theory is a 20-fold identification of the coupling space found in the M- and
string-theory d... | 9910125v1 |
1999-10-31 | Non-renormalizability of a SSB gauge theory induced by a non-linear fermion-Higgs coupling of canonical dimension 4 | We consider an abelian gauge theory with spontaneously broken symmetry
containing a scalar-fermion coupling which is non-linear in the Higgs field.
Although in the unitary gauge it reduces to a pure Yukawa term, suggesting that
the theory is renormalizable, the one loop divergence structure in this gauge
in the fermion... | 9910257v2 |
1999-11-12 | Static Potential in N=4 Supersymmetric Yang-Mills Theory | We compute the leading order perturbative correction to the static potential
in ${\cal N}=4$ supersymmetric Yang-Mills theory. We show that the perturbative
expansion contains infrared logarithms which, when resummed, become logarithms
of the coupling constant. The resulting correction goes in the right direction
to ma... | 9911088v1 |
1999-12-04 | On the Coupling of Gravitons to Matter | Using relationships between open and closed strings, we present a
construction of tree-level scattering amplitudes for gravitons minimally
coupled to matter in terms of gauge theory partial amplitudes. In particular,
we present examples of amplitudes with gravitons coupled to vectors or to a
single fermion pair. We als... | 9912033v1 |
2000-02-28 | Aspects of holography and rotating AdS black holes | A comparison is made between the thermodynamics of weakly and strongly
coupled Yang-Mills with fixed angular momentum. The free energy of the strongly
coupled Yang-Mills is calculated by using a dual supergravity description
corresponding to a rotating black hole in an Anti de Sitter (AdS) background.
All thermodynamic... | 0002235v1 |
2000-03-09 | Regular and black-hole solutions of the Einstein-Yang-Mills-Higgs equations; the case of nonminimal coupling | Regular and black-hole solutions of the spontaneously broken
Einstein-Yang-Mills-Higgs theory with nonminimal coupling to gravity are shown
to exist. The main characteristics of the solutions are presented and
differences with respect to the minimally coupled case are studied. Since
negative energy densities are found ... | 0003073v2 |
2000-04-18 | Chamseddine, Fröhlich, Grandjean Metric and Localized Higgs Coupling on Noncommutative Geometry | We propose a geometrized Higgs mechanism based on the gravitational sector in
the Connes-Lott formulation of the standard model, which has been constructed
by Chamseddine, Fr$\ddot{o}$hlic and Grandjean. The point of our idea is that
Higgs-like couplings depend on the local coordinates of the four-dimensional
continuum... | 0004127v3 |
2000-05-11 | New vortex solution in SU(3) gauge-Higgs theory | Following a brief review of known vortex solutions in SU(N) gauge-adjoint
Higgs theories we show the existence of a new ``minimal'' vortex solution in
SU(3) gauge theory with two adjoint Higgs bosons. At a critical coupling the
vortex decouples into two abelian vortices, satisfying Bogomol'nyi type, first
order, field ... | 0005109v1 |
2000-05-19 | Dynamics of N=2 Supersymmetric Chern-Simons Theories | We discuss several aspects of three dimensional N=2 supersymmetric gauge
theories coupled to chiral multiplets. The generation of Chern-Simons couplings
at low-energies results in novel behaviour including compact Coulomb branches,
non-abelian gauge symmetry enhancement and interesting patterns of dynamically
generated... | 0005186v2 |
2000-12-08 | Consistent gravitino couplings in non-supersymmetric strings | The massless spectrum of the ten dimensional USp(32) type I string has an N=1
supergravity multiplet coupled to non-supersymmetric matter. This raises the
question of the consistency of the gravitino interactions. We resolve this
apparent puzzle by arguing for the existence of a local supersymmetry which is
non-linearl... | 0012071v2 |
2001-01-01 | Supergravity Couplings of Noncommutative D-branes | We discuss the supergravity couplings of noncommutative D-branes by
considering the disk amplitudes with one closed string insertion. The result
confirms a recent proposal for the general form of the noncommutative
Yang-Mills operators coupling to the massless closed string modes. The
construction involves smearing Yan... | 0101016v2 |
2001-03-01 | Critical Coupling in (1+1)-Dimensional Light-Front $φ^{4}$ Theory. II -effects of non-diagonal interactionof non-diagonal interactions- | Spontaneous symmetry breaking in (1+1)-dimensional $\phi^{4}$ theory is
studied with discretized light-front quantization. Taking effects of
non-diagonal interactions into account, the first few terms of the commutation
relations $[a_{0},a_{n}]$ are recalculated in the $\hbar$ expansion. Our result
of the critical coup... | 0103002v2 |
2001-03-13 | Strong-weak coupling duality in anisotropic current interactions | The recently proposed all orders beta function is further investigated. By
using a strong-weak coupling duality of the beta function, and some added
topology of the space of couplings we are able to extend the flows to
arbitrarily large or small scales. Using a non-trivial RG invariant we are able
to identify sine-Gord... | 0103096v2 |
2001-04-16 | M-theory and automorphic scattering | The strongly coupled limit of string scattering and the automorphic
construction of the graviton S-matrix is compared with the eleven dimensional
formulation of M-theory. In a particular scaling limit at strong string
coupling, M-theory is described by eleven-dimensional supergravity which does
not possess a dilaton, b... | 0104132v4 |
2001-05-22 | On Unification of RR Couplings | We consider the couplings of RR fields with open string sector for
$Dp$-${\overline{Dp}}$ backgrounds of various $p$. Proposed approach, based on
the approximation of the open string algebra by the algebra of differential
operators, provides the unified description of these couplings and their
interrelations. | 0105228v3 |
2001-06-03 | Four dimensional N=1 supersymmetrization of R^4 in superspace | We write an action, in four dimensional N=1 curved superspace, which contains
a pure R^4 term with a coupling constant. Starting from the off-shell solution
of the Bianchi identities, we compute the on-shell torsions and curvatures with
this term. We show that their complete solution includes, for some of them, an
infi... | 0106023v2 |
2001-06-07 | Einstein-Hilbert action on the brane for the bulk graviton | We find new closed string couplings on Dp-branes for the bosonic string.
These couplings are quadratic in derivatives and therefore take the form of
induced kinetic terms on the brane. For the graviton in particular we find the
induced Einstein-Hilbert term as well as terms quadratic in the second
fundamental tensor. W... | 0106067v2 |
2001-06-22 | (A)dS Backgrounds from Asymmetric Orientifolds | I present asymmetric orientifold models which, with the addition of RR
fluxes, fix all the NS NS moduli including the dilaton. In critical string
theory, this gives new AdS backgrounds with (discretely tunably) weak string
coupling. Extrapolating to super-critical string theory, this construction
leads to a promising c... | 0106209v1 |
2001-06-29 | Coupling integrable field theories to mechanical systems at the boundary | We present an integrable Hamiltonian which describes the sinh-Gordon model on
the half line coupled to a non-linear oscillator at the boundary. We explain
how we apply Sklyanin's formalism to a dynamical reflection matrix to obtain
this model. This method can be applied to couple other integrable field
theories to dyna... | 0106275v1 |
2001-08-17 | Searching for string theories of the standard model | We briefly review attempts to construct string theories that yield the
standard model, concentrating on models with a geometric interpretation.
Calabi-Yau compactifications are discussed in the context of both the weakly
coupled heterotic string and the strongly coupled version, heterotic M-theory.
Similarly, we consid... | 0108127v1 |
2001-12-03 | Gluon coupling strength in H_QCD with small cutoffs | This contribution presents the running triple-gluon-vertex coupling constant,
g_lambda, in Hamiltonians for the gluons that are characterized by the size
1/lambda. The coupling constant is obtained from renormalization group
equations for effective particles in canonical light-front QCD in third order
perturbation theo... | 0112018v1 |
2001-12-04 | Bound States in n Dimensions (Especially n = 1 and n = 2) | We stress that in contradiction with what happens in space dimensions $n \geq
3$, there is no strict bound on the number of bound states with the same
structure as the semi-classical estimate for large coupling constant and give,
in two dimensions, examples of weak potentials with one or infinitely many
bound states. W... | 0112021v1 |
2002-01-14 | Integer- and Non-Integer-Shift of the Chern-Simons Coupling under a Local Higher Covariant Derivative Regulator | The Chern-Simons coupling shift is calculated within the framework of the
hybrid regularization based on a local higher covariant derivative regulator.
When the Yang-Mills term is present in the theory the well-know integer-shift
is obtained, but is absent, the shift value is non-integer. These results show
a possibili... | 0201086v1 |
2002-01-24 | On three dimensional coupled bosons | This is a new version of the paper, which uses the same methods as in the
previous version, but the model is now different. We study two complex scalar
fields coupled through a quadratic interaction in 2+1 dimensions. We use the
method of bilinears as suggested by Rajeev. The resulting classical theory is
studied withi... | 0201199v3 |
2002-02-19 | Soliton Decay in Coupled System of Scalar Fields | A system of coupled scalar fields is introduced which possesses a spectrum of
massive single-soliton solutions. Some of these solutions are unstable and
decay into lower mass stable solitons. Some properties of the solutions are
obtained using general principles including conservations of energy and
topological charges... | 0202122v2 |
2002-02-28 | Running coupling in Yang-Mills theory - a flow equation study - | The effective average action of Yang-Mills theory is analyzed in the
framework of exact renormalization group flow equations. Employing the
background-field method and using a cutoff that is adjusted to the spectral
flow, the running of the gauge coupling is obtained on all scales. In four
dimensions and for the gauge ... | 0202207v2 |
2002-04-22 | An Elementary (Pseudo)Scalar at all scales | We consider an extended linear $\sigma $ model in which the fermions are
quarks and are coupled to gluons. Equivalently, this is QCD extended by
coupling the quarks to a colour singlet chiral multiplet of ($ \sigma, \vec \pi
$) fields. This theory has a phase governed by a UV fixed point where all
couplings are AF (asy... | 0204177v1 |
2002-05-31 | de Sitter black hole with a conformally coupled scalar field in four dimensions | A four-dimensional black hole solution of the Einstein equations with a
positive cosmological constant, coupled to a conformal scalar field, is given.
There is a curvature singularity at the origin, and scalar field diverges
inside the event horizon. The electrically charged solution, which has a fixed
charge-to-mass r... | 0205319v2 |
2002-06-03 | Nonequilibrium Dynamics of Coupled Quantum Systems | The nonequilibrium dynamics of coupled quantum oscillators subject to
different time dependent quenches are analyzed in the context of the
Liouville-von Neumann approach. We consider models of quantum oscillators in
interaction that are exactly soluble in the cases of both sudden and smooth
quenches. The time evolution... | 0206022v3 |
2002-06-21 | A Mean Field Approximation to the Worldsheet Model of Planar phi^3 Field Theory | We develop an approximation scheme for our worldsheet model of the sum of
planar diagrams based on mean field theory. At finite coupling the mean field
equations show a weak coupling solution that resembles the perturbative
diagrams and a strong coupling solution that seems to represent a tensionless
soup of field quan... | 0206205v2 |
2002-09-23 | Confinement of fermions by mixed vector-scalar linear potentials in two-dimensional space-time | The problem of confinement of fermions in 1+1 dimensions is approached with a
linear potential in the Dirac equation by considering a mixing of Lorentz
vector and scalar couplings. Analytical bound-states solutions are obtained
when the scalar coupling is of sufficient intensity compared to the vector
coupling. | 0209196v2 |
2002-10-24 | Interaction of global and local monopoles | We study the direct interaction between global and local monopoles. While in
two previous papers, the coupling between the two sectors was only indirect
through the coupling to gravity, we here introduce a new term in the potential
that couples the Goldstone field and the Higgs field directly. We investigate
the influe... | 0210236v1 |
2003-03-13 | Strong coupling in brane-induced gravity in five dimensions | Brane-induced gravity in five dimensions (Dvali--Gabadadze--Porrati model)
exhibits modification of gravity at ultra-large distances, $r\gg r_c =
M_{Pl}^2/M^3$ where $M$ is the five-dimensional gravity scale. This makes the
model potentially interesting for explaining the observed acceleration of the
Universe. We argue... | 0303125v1 |
2003-04-01 | More on the gauge-fixed D3-brane action with dilaton-axion coupling from N=1 superspace | The gauge-fixed action of a `spacetime-filling' D3-brane with dilaton-axion
coupling is formulated in N=1 superspace. We investigate its symmetries by
paying special attention to a possible non-linearly realized extra (hidden)
supersymmetry, and emphasize the need of a linear superfield coupled to an
abelian Chern-Simo... | 0304002v2 |
2003-08-08 | Level truncation and the quartic tachyon coupling | We discuss the convergence of level truncation in bosonic open string field
theory. As a test case we consider the calculation of the quartic tachyon
coupling $\gamma_4$. We determine the exact contribution from states up to
level L=28 and discuss the $L\to\infty$ extrapolation by means of the BST
algorithm. We determi... | 0308059v1 |
2003-11-27 | Solitons in systems of coupled scalar fields | We present a method to obtain soliton solutions to relativistic system of
coupled scalar fields. This is done by examining the energy associated to
static field configurations. In this case we derive a set of first-order
differential equations that solve the equations of motion when the energy
saturates its lower bound... | 0311265v1 |
2004-01-27 | Strong Coupling vs. 4-D Locality in Induced Gravity | We re-examine the problem of strong coupling in a regularized version of DGP
(or ``brane-induced'') gravity. We find that the regularization of ref.
hep-th/0304148 differs from DGP in that it does not exhibit strong coupling or
ghosts up to cubic order in the interactions. We suggest that the nonlocal
nature of the the... | 0401211v2 |
2004-01-30 | Coupling of Higher Spin Gauge Fields to a Scalar Field in $AdS_{d+1}$ and their Holographic Images in the $d$-Dimensional Sigma Model | The three-point functions of two scalar fields $\sigma$ and the higher spin
field $h^{(\ell)}$ of HS(4) on the one side and of their proposed holographic
images $\alpha$ and $\mathcal{J^{(\ell)}}$ of the minimal conformal O(N) sigma
model of dimension three on the other side are evaluated at leading
perturbative order ... | 0401240v1 |
2004-04-29 | Through the Looking Glass: AdS-FT with time dependent boundary conditions and black hole formation | I solve for the behavior of scalars in Lorentzian AdS with time dependent
boundary conditions, focusing in particular on the dilaton. This corresponds,
via the AdS-CFT correspondence, to considering a gauge theory with a time
dependent coupling. Changes which keep the gauge coupling nonzero result in
finite but physica... | 0404244v1 |
2004-05-31 | Holographic dark energy model with non-minimal coupling | We find that holographic dark energy model with non-minimally coupled scalar
field gives rise to an accelerating universe by choosing Hubble scale as IR
cutoff. We show viable range of a non-minimal coupling parameter in the
framework of this model. | 0405281v5 |
2004-05-31 | Wavy Wilson Line and AdS/CFT | Wilson loops which are small deviations from straight, infinite lines, called
wavy lines, are considered in the context of the AdS/CFT correspondence. A
single wavy line and the connected correlation function of a straight and wavy
line are considered. It is argued that, to leading order in ``waviness'', the
functional... | 0405288v1 |
2004-07-30 | Gravity in Randall-Sundrum two D-brane model | We analyse Randall-Sundrum two D-brane model by linear perturbation and then
consider the linearised gravity on the D-brane. The qualitative contribution
from the Kaluza-Klein modes of gauge fields to the coupling to the gravity on
the brane will be addressed. As a consequence, the gauge fields localised on
the brane a... | 0407268v1 |
2004-08-03 | Two dimensional non-linear sigma models as a limit of the linear sigma models | We show how to obtain the O(N) non-linear sigma model in two dimensions as a
strong coupling limit of the corresponding linear sigma model. In taking the
strong coupling limit, the squared mass parameter must be given a specific
coupling dependence that assures the finiteness of the physical mass scale. The
relation di... | 0408025v2 |
2004-09-03 | Spin Chain for Quantum Strings | We review and compare the integrable structures in N=4 gauge theory and
string theory on AdS5xS5. Recently, Bethe ansaetze for gauge theory/weak
coupling and string theory/strong coupling were proposed to describe scaling
dimensions in the su(2) subsector. Here we investigate the Bethe equations for
quantum string theo... | 0409054v2 |
2004-09-24 | Marginal Deformations and Closed String Couplings in Open String Field Theory | We investigate analytic classical solutions in open string field theory which
are constructed in terms of marginal operators. In the classical background, we
evaluate a coupling between an on-shell closed string state and the open string
field. The resulting coupling exhibits periodic behavior as expected from the
marg... | 0409249v1 |
2004-10-28 | Renormalization group in the internal space | Renormalization group in the internal space consists of the gradual change of
the coupling constants. Functional evolution equations corresponding to the
change of the mass or the coupling constant are presented in the framework of a
scalar model. The evolution in the mass which yields the functional
generalization of ... | 0410271v1 |
2005-03-07 | Solution of the Dirac equation with non-minimal coupling to noncentral three-vector potential | We introduce non-minimal coupling to three-vector potential in the 3+1
dimensional Dirac equation. The potential is noncentral (angular-dependent)
such that the Dirac equation separates completely in spherical coordinates. The
relativistic energy spectrum and spinor wavefunctions are obtained for the case
where the rad... | 0503054v1 |
2005-06-02 | The strong coupling effect and auxiliary fields in the DGP-model | The DGP-model with additional terms in the action is considered. These terms
have a special form and include auxiliary scalar fields without kinetic terms,
which are non-minimally coupled to gravity. The use of these fields allows one
to exclude the mode, which corresponds to the strong coupling effect, from the
theory... | 0506020v1 |
2005-07-01 | Dualisation of the Symmetric Space Sigma Model with Couplings | The first-order formulation of the G/K symmetric space sigma model of the
scalar cosets of the supergravity theories is discussed when there is coupling
of (m-1)-form matter fields. The Lie superalgebra which enables the dualized
coset formulation is constructed for a general scalar coset G/K with matter
coupling where... | 0507007v1 |
2005-09-09 | Numerical evidence for the Maldacena conjecture in two-dimensional N=(8,8) super Yang-Mills theory | The N=(8,8) super Yang-Mills theory in 1+1 dimensions is solved at strong
coupling to directly confirm the predictions of supergravity at weak coupling.
The calculations are done in the large-N_c approximation using Supersymmetric
Discrete Light-Cone Quantization. The stress-energy correlator is obtained as a
function ... | 0509070v1 |
2005-10-17 | Integral representation of the Ising model | The partition function of the 2D Ising model coupled to an external magnetic
field is studied. We show that the sum over the spin variables can be reduced
to an integration over a finite number of variables. This integration must be
performed numerically. But in order to reduce the partition function we must
introduce ... | 0510143v1 |
2005-10-27 | Dynamics of supertubes | We find the evolution of arbitrary excitations on 2-charge supertubes, by
mapping the supertube to a string carrying traveling waves. We argue that when
the coupling is increased from zero the energy of excitation leaks off to
infinity, and when the coupling is increased still further a new set of long
lived excitation... | 0510235v1 |
2006-01-09 | Renormalization group dependence of the QCD coupling | The general relation between the standard expansion coefficients and the beta
function for the QCD coupling is exactly derived in a mathematically strict
way. It is accordingly found that an infinite number of logarithmic terms are
lost in the standard expansion with a finite order, and these lost terms can be
given in... | 0601051v1 |
2006-02-07 | Thermal flow in the gravitational O(n) model | We study the massless flow from the critical point (dilute loops) to the
low-temperature phase (dense loops) of the O(n) loop gas model when the model
is coupled to 2D gravity. The flow is generated by the gravitationally dressed
thermal operator \Phi_{1,3} coupled to the renormalized loop tension \lambda ~
T-T_c. We f... | 0602075v2 |
2006-07-25 | A supersymmetric matrix model: II. Exploring higher-fermion-number sectors | Continuing our previous analysis of a supersymmetric quantum-mechanical
matrix model, we study in detail the properties of its sectors with fermion
number F=2 and 3. We confirm all previous expectations, modulo the appearance,
at strong coupling, of {\it two} new bosonic ground states causing a further
jump in Witten's... | 0607198v1 |
2006-09-13 | Brane world scenario in the presence of a non-minimally coupled bulk scalar field | We present our recent work on brane world models with a non-minimally coupled
scalar field. In [9] we examined the stability of these models against scalar
field perturbations and we discussed possible physical implications, while in
[10] we developed a numerical approach for the solution of the Einstein
equations with... | 0609089v2 |
2006-10-09 | Generalized Gross-Neveu Models and Chiral Symmetry Breaking from String Theory | We consider intersecting D-brane models which have two dimensional chiral
fermions localized at the intersections. At weak coupling, the interactions of
these fermions are described by generalized Gross-Neveu models. At strong
coupling, these configurations are described by the dynamics of probe D-branes
in a curved ba... | 0610087v1 |
2006-10-25 | Confinement in (2+1)-Dimensional Gauge Theories at Weak Coupling | In axial gauge, the (2+1)-dimensional SU($N$) Yang-Mills theory is equivalent
to a set of (1+1)-dimensional integrable models with a non-local coupling
between charge densities. This fact makes it possible to determine the static
potential between charges at weak coupling in an anisotropic version of the
theory, and un... | 0610262v1 |
2007-02-05 | On the Strong Coupling Scaling Dimension of High Spin Operators | We give an exact analytic solution of the strong coupling limit of the
integral equation which was recently proposed to describe the universal scaling
function of high spin operators in N = 4 gauge theory. The solution agrees with
the prediction from string theory, confirms the earlier numerical analysis and
provides a... | 0702028v1 |
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