publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2003-03-28 | QCD sum rule analysis of the coupling constants g_{ρηγ} and g_{ωηγ} | The coupling constants g$_{\rho\eta\gamma}$ and g$_{\omega\eta\gamma}$ are
calculated using QCD sum rules method by studying the three point
${\rho\eta\gamma}$ and ${\omega\eta\gamma}$ correlation functions. A comparison
of the results with the values of the coupling constants that are deduced from
the experimentally m... | 0303244v1 |
2003-04-26 | Anomalous quartic boson couplings via gamma gamma --> WW and gamma gamma --> WWZ at the TESLA kinematics | The production of two and three electroweak gauge bosons in the high-energy
$\gamma\gamma$ collisions gives the well opportunity to probe anomalous quartic
gauge boson couplings. The influence of five possible anomalous couplings on
the cross sections for $W^+W^-$, $W^+W^-\gamma$, $W^+W^-Z$ productions has been
investi... | 0304250v2 |
2003-05-18 | Chiral Symmetry Breaking with Scalar Confinement | Spontaneous chiral symmetry breaking is accepted to occur in low energy
hadronic physics, resulting in the several successful theorems of PCAC. On the
other hand scalar confinement is suggested both by the spectroscopy of hadrons
and by the string picture of confinement. However these two evidences are
apparently confl... | 0305198v1 |
2003-05-19 | Standard-model coupling constants from compositeness | A coupling-constant definition is given based on the compositeness property
of some particle states with respect to the elementary states of other
particles. It is applied in the context of the vector-spin-1/2-particle
interaction vertices of a field theory, and the standard model. The definition
reproduces Weinberg's ... | 0305211v1 |
2003-05-26 | Meson-Baryon Scattering in QCD_2 for any Coupling | Extending earlier work on strong-coupling meson-baryon scattering in QCD_2,
we derive the effective meson-baryon action for any value of the coupling
constant, in the large-N_c limit. Colour degrees of freedom play an important
role, and we show that meson-baryon scattering can be formulated as a
relativistic potential... | 0305292v2 |
2003-08-04 | A QCD Axion from Higher Dimensional Gauge Field | We point out that a QCD axion solving the strong CP problem can arise
naturally from parity-odd gauge field C_M in 5-dimensional (5D) orbifold field
theory. The required axion coupling to the QCD anomaly comes from the 5D
Chern-Simons coupling, and all other unwanted U(1)_{PQ} breaking axion
couplings can be avoided na... | 0308024v1 |
2003-08-05 | Gauge Coupling Unification and Neutrino Masses in 5D SUSY SO(10) | In this talk I discuss the problems and virtues of SUSY GUTs in four
dimensions. I then show how to solve some of these problems, without foregoing
the virtues, by considering an SO(10) SUSY GUT in five dimensions. I discuss
gauge coupling unification and neutrino masses. In particular, it is shown that
the 5D compacti... | 0308052v1 |
2003-08-29 | Pomeron fan diagrams with an infrared cutoff and running coupling | By direct numerical calculations the influence of a physically relevant
infrared cutoff and running coupling on the gluon density and structure
function of a large nucleus is studied in the perturbative QCD approach. It is
found that the infrared cutoff changes the solutions very little. Running of
the coupling produce... | 0308320v1 |
2003-09-02 | Photon polarization with anomalous right-handed top couplings in $B\to K_{res}γ$ | The effect of anomalous right-handed top couplings on the photon polarization
in $B\to K_{\rm res}\gamma$ is investigated. It is recently reported that the
photon polarization can be measured through the up-down asymmetry of the photon
direction relative to the subsequent $K_{\rm res}$ decay plane. We find that
the ano... | 0309018v1 |
2003-10-14 | Analytic structure in the coupling constant plane in perturbative QCD | We investigate the analytic structure of the Borel-summed perturbative QCD
amplitudes in the complex plane of the coupling constant. Using the method of
inverse Mellin transform, we show that the prescription dependent Borel-Laplace
integral can be cast, under some conditions, into the form of a dispersion
relation in ... | 0310169v1 |
2003-12-02 | Towards a renormalizable standard model without fundamental Higgs scalar | We investigate the possibility of constructing a renormalizable standard
model with purely fermionic matter content. The Higgs scalar is replaced by
point-like fermionic self-interactions with couplings growing large at the
Fermi scale. An analysis of the UV behavior in the point-like approximation
reveals a variety of... | 0312034v1 |
2003-12-21 | Two loop renormalization of the magnetic coupling in hot QCD | Well above the critical temperature hot QCD is described by 3d electrostatic
QCD with gauge coupling $g_E$ and Debye mass $m_E$. We integrate out the Debye
scales to two loop accuracy and find for the gauge coupling in the resulting
magnetostatic action $g_M^2=g_E^2(1-{1\over{48}}{g_E^2N\over{\pi m_E}}
-{17\over{4608}}... | 0312307v3 |
2004-01-06 | Spin and parity of a possible baryon antidecuplet | The recently postulated existence of a baryon antidecuplet [1] can be
reproduced in strong coupling theory in which a bare baryon spin 1/2 octet
interacts with an octet of pseudoscalar mesons. When a suitable mixture of F-
and D-type Yukawa couplings is chosen the dressed baryons group themselves into
an infinite numbe... | 0401023v1 |
2004-01-21 | Phenomenological analysis of lepton and quark Yukawa couplings in SO(10) two Higgs model | We investigate a model that the Yukawa coupling form is constructed by two
kinds of matrix (M_0 and M_1). For example, in the SO(10) GUT model, M_0 and
M_1 are Yukawa couplings generated by the 10 and 126 Higgs scalars. We study
how this model can give the observed mass and mixings of quarks and leptons.
Parameter fitt... | 0401154v1 |
2004-05-04 | Strong and Yukawa two-loop contributions to Higgs scalar boson self-energies and pole masses in supersymmetry | I present results for the two-loop self-energy functions for neutral and
charged Higgs scalar bosons in minimal supersymmetry. The contributions given
here include all terms involving the QCD coupling, and those following from
Feynman diagrams involving Yukawa couplings and scalar interactions that do not
vanish as the... | 0405022v3 |
2004-07-21 | Universality of the rho-meson coupling in effective field theory | It is shown that both the universal coupling of the rho-meson and the
Kawarabayashi-Suzuki-Riadzuddin-Fayyazuddin expression for the magnitude of its
coupling constant follow from the requirement that chiral perturbation theory
of pions, nucleons, and rho-mesons is a consistent effective field theory. The
prerequisite ... | 0407239v1 |
2004-07-30 | On the strong-coupling effects in jet bremsstrahlung in the heavy flavor decays | We address the strong-coupling regime effects in the light-like quark jets
where the radiated gluons are hard but highly collinear. These may lead to
additional contributions in the invariant mass (or recoil energy) spectra, on
top of the Fermi motion of the initial heavy quark in decays like b->s+\gamma.
It is shown t... | 0407359v1 |
2004-08-10 | How to study weakly coupled neutral vector bosons | A weakly coupled new neutral gauge boson, forming a narrow resonance, can be
efficiently produced at e+e- colliders through radiative return processes if
the collider energy is larger than the gauge boson mass. This contribution
analyzes the sensitivity of a future linear collider for weakly coupled gauge
bosons and br... | 0408132v1 |
2004-08-13 | Mass of D*_sJ(2317) and Coupled Channel Effect | The resonance D*_sJ (2317) which is considered to be the 1^3P_0 state
composed of charm and strange quarks has been discovered recently. The measured
mass, which is about 160 MeV lower than the mass of the 1^3P_0 state obtained
from the potential model calculation by Godfrey and Isgur, was considered
surprisingly low a... | 0408154v1 |
2004-08-18 | Phenomenology of Goldstino Couplings | A general coupling of the Goldstino to the matter field and the weak
gravitational field is constructed based on the standard and the nonlinear
Volkov-Akulov realization of SUSY. The resulting Lagrangian, which is invariant
under SUSY transformations, can give rise to explicit interactions which couple
the helicity +-1... | 0408210v2 |
2004-08-24 | Determination of the HWW and HZZ Couplings at the LHC | The weak boson fusion process for neutral Higgs boson production is
investigated with particular attention to the accuracy with which the Higgs
boson couplings to weak bosons can be determined in final states that contain a
Higgs boson plus at least two jets at CERN Large Hadron Collider energies. We
determine that an ... | 0408259v1 |
2004-08-30 | SU(3) Clebsch-Gordan Coefficients for Baryon-Meson Coupling at Arbitrary N_c | We present explicit formulae for the SU(3) Clebsch-Gordan coefficients that
are relevant for the couplings of large N_c baryons to mesons. In particular,
we compute the Clebsch-Gordan series for the coupling of the octet (associated
with mesons, and remains the correct representation at large N_c) to the large
N_c anal... | 0408342v1 |
2004-11-05 | Partly Supersymmetric Grand Unification | It is shown how grand unification can occur in models which are partly
supersymmetric. The particle states which are composite do not contribute to
the running of gauge couplings above the compositeness scale, while the
elementary states contribute the usual large logarithmns. This introduces a new
differential running... | 0411090v1 |
2004-11-07 | Evolution of coupled classical fields | We study the evolution of the coupled scalar and fermion fields within the
classical field theory. We examine the case of N coupled fields in 1+3
dimensional space. The general expressions for the fields distributions are
obtained. The particular case of two fields in 1+1 dimensional space is
carefully studied. We obta... | 0411101v2 |
2005-01-15 | Flavor changing scalar couplings and $tγ(Z)$ production at hadron colliders | We calculate the contributions of the flavor changing scalar ($FCS$)
couplings arised from topcolor-assisted technicolor ($TC2$) models at
tree-level to the $t\gamma$ and $tZ$ production at the Tevatron and $LHC$
experiments. We find that the production cross sections are very small at the
Tevatron with $\sqrt{s}=1.96T... | 0501131v1 |
2005-02-13 | Electroweak phase transition and Higgs self-couplings in the two-Higgs-doublet model | We calculate both the cubic and the quartic self-couplings of the lighter
scalar Higgs boson without assuming the decoupling limit in the
two-Higgs-doublet model (THDM). In some regions of parameter space of the THDM
where the electroweak phase transition is strongly first order, it is possible
that the quartic self-co... | 0502116v1 |
2005-03-07 | Two-loop QCD gauge coupling at high temperatures | We determine the 2-loop effective gauge coupling of QCD at high temperatures,
defined as a matching coefficient appearing in the dimensionally reduced
effective field theory. The result allows to improve on one of the classic
non-perturbative probes for the convergence of the weak-coupling expansion at
high temperature... | 0503061v1 |
2005-08-01 | Determining the Stau Trilinear Coupling A_tau in Supersymmetric Higgs Decays | The measurement of the trilinear couplings A in the part of the Lagrangian
which breaks supersymmetry softly will be a difficult experimental task. In
this report the heavy Higgs decays H,A -> stau_1 stau_2 to stau pairs are
investigated for measuring the stau trilinear coupling A_tau. Based on detailed
simulations of ... | 0508021v1 |
2005-08-25 | Higgs bosons in Left-Right symmetric Randall-Sundrum models | We study the corrections to Higgs physics in a model of a single warped extra
dimension with all fields except the Higgs in the bulk, and a gauge symmetry
extended to $SU(2)_L\times SU(2)_R \times U(1)_{B-L}$. We find that generically
the Higgs coupling to electroweak gauge boson pairs is suppressed, the coupling
to gl... | 0508266v1 |
2005-09-15 | Probing the Universal Randall-Sundrum Model at the ILC | The Randall-Sundrum model with all Standard Model (SM) fields in the bulk,
including the Higgs, can be probed by precision measurements at the ILC. In
particular, the couplings of the Higgs to the gauge bosons of the SM can be
determined with high accuracy at the ILC. Here we examine the deviations in
these couplings f... | 0509160v2 |
2005-10-13 | Collider Bounds on Pseudoscalars Coupling to Gauge Bosons | We bound the coupling of pseudo-scalar particles to Tr G^G_{QCD} using (the
lack of) monojet plus missing E_T events at the Tevatron, and estimate the
bounds obtainable from LHC. In addition, we revisit the bounds on the coupling
to F^F_{EM} from e^+e^- collider events with single photon and missing E_T
final states. T... | 0510183v2 |
2005-11-15 | Axion interpretation of the PVLAS data? | The PVLAS collaboration has recently reported the observation of a rotation
of the polarization plane of light propagating through a transverse static
magnetic field. Such an effect can arise from the production of a light, m_A ~
meV, pseudoscalar coupled to two photons with coupling strength g_{A\gamma} ~
5x10^{-6} Ge... | 0511184v1 |
2005-12-04 | Couplings of the eta and eta' Mesons to the Nucleon | The couplings of the eta and eta' mesons to the nucleon are obtained from the
U_A(1) Goldberger-Treiman relation. The chiral symmetry breaking corrections
are very large and bring the calculated values of the coupling constants
G_etaNN and G_eta'NN close to values obtained from potential models. | 0512048v3 |
2005-12-05 | Four-Loop Decoupling Relations for the Strong Coupling | We compute the matching relation for the strong coupling constant within the
framework of QCD up to four-loop order. This allows a consistent five-loop
running (once the $\beta$ function is available to this order) taking into
account threshold effects. As a side product we obtain the effective coupling
of a Higgs boso... | 0512058v1 |
2005-12-05 | QCD Decoupling at Four Loops | We present the matching condition for the strong coupling contant alpha_s at
a heavy quark threshold to four loops in the modified minimal subtraction
scheme. Our results lead to further decrease of the theoretical uncertainty of
the evolution of the strong coupling constant through heavy quark thresholds.
Using a low ... | 0512060v1 |
2006-01-01 | Phases of a fermionic model with chiral condensates and Cooper pairs in 1+1 dimensions | We study the phase structure of a 4-fermi model with three bare coupling
constants, which potentially has three types of bound states. This model is a
generalization of the model discussed previously by A. Chodos et al. [Phys.
Rev. D 61, 045011 (2000)], which contained both chiral condensates and Cooper
pairs. For this... | 0601007v1 |
2006-02-07 | Stable gapless superconductivity at strong coupling | We study cross-flavor Cooper pairing in a relativistic system of two fermion
species with mismatched Fermi surfaces. We find that there exist gapless phases
which are characterized by either one or two gapless nodes in the energy
spectra of their quasiparticles. An analysis of the current-current correlator
reveals tha... | 0602065v1 |
2006-02-16 | Investigation of g_f0-rho-gamma and g_a0-rho-gamma coupling constants in light cone sum rules | We present a calculation of the coupling constant f0-->rho-gamma of and
a0-->rho-gamma decays from the point of the light cone QCD sum rules. We
estimate the coupling constants g_f0-rho-gamma and g_a0-rho-gamma which are an
essential ingredient in the analysis of physical processes involving isoscalar
f0(980) and isove... | 0602147v1 |
2006-04-29 | Grand Unification in the SO(10) Model | Extrapolating the coupling strengths to very high energies, one finds that
they do not converge to a single coupling constant, as expected in the simplest
gauge theory of Grand Unification, the SU(5) theory. We find that the coupling
constants do converge, provided that two new intermediate energy scales are
introduced... | 0605004v1 |
2006-05-10 | Higgs + 2 Jets as a Probe for CP Properties | Azimuthal angle correlations of the jets in Hjj events at the LHC provide a
probe of the CP nature of Higgs couplings to gauge bosons. In weak boson fusion
the HWW and HZZ couplings are tested. Gluon fusion processes probe the tensor
structure of the effective Hgg vertex and thus the CP nature of the dominant
quark cou... | 0605117v1 |
2006-07-19 | Comment on "Mass and KΛCoupling of the N*(1535)" | We comment on a recent paper by B.C. Liu and B.S. Zou [Phys. Rev. Lett. 96,
042002 (2006)] where it was argued that the coupling of the N*(1535) to
K\Lambda is even larger than its coupling to the \eta N channel. Specifically,
we point out that recently measured Dalitz plot distributions for pp ->
pK^+\Lambda provide c... | 0607212v1 |
2006-08-04 | Shear viscosity in weakly coupled ${\cal N} {=} 4$ Super Yang-Mills theory compared to QCD | We compute the shear viscosity of weakly coupled N=4 supersymmetric
Yang-Mills (SYM) theory. Our result for [eta/s], the viscosity to
entropy-density ratio, is many times smaller than the corresponding
weak-coupling result in QCD. This suggests that [eta/s] of QCD near the
transition point is several times larger than ... | 0608062v2 |
2006-08-28 | Anomalous Higgs Couplings at an $e γ$ Collider | We examine the sensitivity of $e \gamma$ colliders (based on $e^+ e^-$ linear
colliders of c.m. energy 500 GeV) to the anomalous couplings of the Higgs to
W-bosons via the process $e^- \gamma \longrightarrow \nu W H$. This has the
advantage over $e^+ e^-$ collider in being able to dissociate WWH vertex from
ZZH. We are... | 0608293v1 |
2006-10-19 | Phenomenology of infrared finite gluon propagator and coupling constant | We report on some recent solutions of the Dyson-Schwinger equations for the
infrared behavior of the gluon propagator and coupling constant, discussing
their differences and proposing that these different behaviors can be tested
through hadronic phenomenology. We discuss which kind of phenomenological tests
can be appl... | 0610256v2 |
2006-10-24 | QCD sum rule approach to the new mesons and the $g_{D_{sJ}DK}$ coupling constant | We use diquark-antidiquark currents to investigate the masses and partial
decay widths of the recently observed mesons $D_{sJ}^{+}(2317)$,
$D_0^{*0}(2308)$ and X(3872), considered as four-quark states, in a QCD sum
rule approach. In particular we investigate the coupling constant
$g_{D_{sJ}DK}$. We found that the $g_{D... | 0610320v1 |
2006-12-12 | Scalar form factor of the nucleon and nucleon--scalar meson coupling constant in QCD | Scalar form factor of the nucleon is calculated in the framework of light
cone QCD sum rules, using the most general form of the baryon current. Using
the result on scalar form factor of the nucleon, the nucleon-scalar "sigma" and
"a_0" meson coupling constants are estimated. Our results on these couplings
are in good ... | 0612144v2 |
2006-12-12 | To see the exotic Theta^+ baryon from interference | Since all couplings of the exotic $\Theta^+$ baryon to normal hadrons seem to
be small it is hard to reveal it in standard resonance searching. We suggest to
look for the $\Theta^+$ production in interference with a known resonance
yielding the same final state but having a high production rate. The
interference proces... | 0612150v1 |
2007-01-14 | Thermal production of gravitinos | We reconsider thermal production of gravitinos in the early universe, adding
to previously considered 2 -> 2 gauge scatterings: a) production via 1 -> 2
decays, allowed by thermal masses; b) the effect of the top Yukawa coupling; c)
a proper treatment of the reheating process. Our final result behaves
physically (large... | 0701104v2 |
2007-02-19 | The BFKL Pomeron in the weak and strong coupling limits and kinematical constraints | We show that a resummation model for the evolution kernel at small x creates
a bridge between the weak and strong couplings. The resummation model embodies
DGLAP and BFKL anomalous dimensions at leading logarithmic orders, as well as a
kinematical constraint on the real emission part of the kernel. In the case of
pure ... | 0702195v1 |
2007-03-07 | Small Shear Viscosity of a Quark-Gluon Plasma Implies Strong Jet Quenching | We derive an expression relating the transport parameter $\hat{q}$ and the
shear viscosity $\eta$ of a weakly coupled quark-gluon plasma. A deviation from
this relation can be regarded as a quantitative measure of ``strong coupling''
of the medium. The ratio $T^3/\hat{q}$, where $T$ is the temperature, is a more
broadl... | 0703082v3 |
1992-01-17 | Spectrum of Two-Dimensional (Super)Gravity | We review the BRST analysis of the system of a (super)conformal matter
coupled to 2D (super)gravity. The spectrum and its operator realization are
reported. In particular, the operators associated with the states of nonzero
ghost number are given. We also discuss the ground ring structure of the
super-Liouville coupled... | 9201034v1 |
1992-01-29 | Coupling of Tachyons and Discrete States in $c = 1$ 2-D Gravity | All the three point couplings involving tachyons and/or discrete states are
obtained in $c=1$ two-dimensional (2-D) quantum gravity by means of the
operator product expansion (OPE). Cocycle factors are found to be necessary in
order to maintain the analytic structure of the OPE, and are constructed
explicitly both for ... | 9201065v2 |
1992-02-18 | Axion Couplings and Effective Cut-Offs in Superstring Compactifications | We use the linear supermultiplet formalism of supergravity to study axion
couplings and chiral anomalies in the context of field-theoretical Lagrangians
describing orbifold compactifications beyond the classical approximation. By
matching amplitudes computed in the effective low energy theory with the
results of string... | 9202059v1 |
1992-03-28 | Current Algebra of WZNW Models at and away from Criticality | We derive the current algebra of principal chiral models with a Wess-Zumino
term. At the critical coupling where the model becomes conformally invariant
(Wess-Zumino-Novikov-Witten theory), this algebra reduces to two commuting
Kac-Moody algebras, while in the limit where the coupling constant is taken to
zero (ordinar... | 9203075v1 |
1992-04-13 | Moduli Corrections to Gauge and Gravitational Couplings in four dimensional Superstrings | We study one-loop, moduli-dependent corrections to gauge and gravitational
couplings in supersymmetric vacua of the heterotic string. By exploiting their
relation to the integrability condition for the associated CP-odd couplings, we
derive general expressions for them, both for $(2,2)$ and $(2,0)$ models, in
terms of ... | 9204030v2 |
1992-07-26 | Deviations from Scale Invariance near a General Conformal Background | Deviations from scale invariance resulting from small perturbations of a
general two dimensional conformal field theory are studied. They are expressed
in terms of beta functions for renormalization of general couplings under local
change of scale. The beta functions for homogeneous background are given
perturbatively ... | 9207085v1 |
1992-12-07 | Superstring Threshold Corrections to Yukawa Couplings | A general method of computing string corrections to the K\"ahler metric and
Yukawa couplings is developed at the one-loop level for a general
compactification of the heterotic superstring theory. It also provides a direct
determination of the so-called Green-Schwarz term. The matter metric has an
infrared divergent par... | 9212045v1 |
1993-03-10 | Role of Short Distance Behavior in Off-Shell Open-String Field Theory | A recent proposal for a background independent open string field theory is
studied in detail for a class of backgrounds that correspond to general
quadratic boundary interactions on the world-sheet. A short-distance cut-off is
introduced to formulate the theory with a finite number of local and
potentially unrenormaliz... | 9303067v1 |
1993-04-28 | A remark on the coupling-dependence in affine Toda field theories | The affine Toda field theories based on the non simply-laced Lie algebras are
discussed. By rewriting the S-matrix formulae found by Delius et al, a
universal form for the coupling-constant dependence of these models is
obtained, and related to various general properties of the classical couplings.
This is illustrated ... | 9304149v1 |
1993-05-09 | Breaking of Topological Symmetry | The coupling of topological matter to topological Yang-Mills theory in four
dimensions is considered and a model is presented. It is shown that, contrary
to the two-dimensional case, this coupling leads to a breaking of the
topological symmetry. This means that the vacuum expectation values of the
observables of the th... | 9305028v2 |
1993-07-19 | Nonlinear Renormalization Group Equation for Matrix Models | An exact renormalization group equation is derived for the free energy of
matrix models. The renormalization group equation turns out to be nonlinear for
matrix models, as opposed to linear for vector models. An algorithm for
determining the critical coupling constant and the critical exponent is
obtained. As concrete ... | 9307116v2 |
1993-08-15 | Information Retrieval from a Charge `Trap' | We study the model of massless $1+1$ electrodynamics with nonconstant
coupling, introduced by Peet, Susskind and Thorlacius as the `charge hole'. But
we take the boundary of the strong coupling region to be first timelike, then
spacelike for a distance $X$, and then timelike again (to mimic the structure
of a black hol... | 9308069v1 |
1993-08-25 | Continuum Strong Coupling Expansion of Yang-Mills Theory: Quark Confinement and Infra-Red Slavery | We solve Schr\"odinger's equation for the ground-state of {\it
four}-dimensional Yang-Mills theory as an expansion in inverse powers of the
coupling. Expectation values computed with the leading order approximation are
reduced to a calculation in {\it two}-dimensional Yang-Mills theory which is
known to confine. Conseq... | 9308116v2 |
1993-08-26 | Extending the Theory of Random Surfaces | The theory of embedded random surfaces, equivalent to two--dimensional
quantum gravity coupled to matter, is reviewed, further developed and partly
generalized to four dimensions. It is shown that the action of the Liouville
field theory that describes random surfaces contains terms that have not been
noticed previousl... | 9308121v1 |
1993-08-27 | A String Project in Multicolour QCD | Some old and new evidence for the existence of the string (planar random
surfaces) representation of multicolour QCD are reviewed. They concern the
random surface representation of the strong coupling expansion in lattice
multicolour gauge theory in any dimension. Our old idea of modified strong
coupling expansion in t... | 9308135v1 |
1993-10-22 | Scalar Fields Coupled to Four-Dimensional Lattice Gravity | I discuss some results we have obtained recently in a lattice model for
quantized gravity coupled to scalar matter in four dimensions. We have looked
at how the continuous phase transition separating the smooth from the rough
phase of gravity is influenced by the presence of the scalar field. We find
that close to the ... | 9310152v1 |
1994-01-10 | An Exact Solution to O(26) Sigma Model coupled to 2-D Gravity | By a mapping to the bosonic string theory, we present an exact solution to
the O(26) sigma model coupled to 2-D quantum gravity. In particular, we obtain
the exact gravitational dressing to the various matter operators classified by
the irreducible representations of O(26). We also derive the exact form of the
gravitat... | 9401038v1 |
1994-04-28 | Multiple Ising Spins Coupled to 2d Quantum Gravity | We study a model in which p independent Ising spins are coupled to 2d quantum
gravity (in the form of dynamical planar phi-cubed graphs). Consideration is
given to the p tends to infinity limit in which the partition function becomes
dominated by certain graphs; we identify most of these graphs. A truncated
model is so... | 9404174v1 |
1994-06-09 | Maintaining coherence in Quantum Computers | The effect of the inevitable coupling to external degrees of freedom of a
quantum computer are examined. It is found that for quantum calculations (in
which the maintenance of coherence over a large number of states is important),
not only must the coupling be small but the time taken in the quantum
calculation must be... | 9406058v1 |
1994-06-21 | Frustrating and Diluting Dynamical Lattice Ising Spins | We investigate what happens to the third order ferromagnetic phase transition
displayed by the Ising model on various dynamical planar lattices (ie coupled
to 2D quantum gravity) when we introduce annealed bond disorder in the form of
either antiferromagnetic couplings or null couplings. We also look at the
effect of s... | 9406138v1 |
1994-06-28 | Quantum Backreaction on ``Classical'' Variables | A mathematically consistent procedure for coupling quasiclassical and quantum
variables through coupled Hamilton-Heisenberg equations of motion is derived
from a variational principle. During evolution, the quasiclassical variables
become entangled with the quantum variables with the result that the value of
the quasic... | 9406182v2 |
1994-07-22 | Gravitationally Dressed Conformal Field Theory and Emergence of Logarithmic Operators | We study correlation functions in two-dimensional conformal field theory
coupled to induced gravity in the light-cone gauge. Focussing on the fermion
four-point function, we display an unexpected non-perturbative singularity
structure: coupling to gravity {\it qualitatively} changes the perturbative
$(x_1-x_2)^{-1}(x_3... | 9407151v1 |
1994-08-12 | From Weak to Strong Coupling in Two-Dimensional Gravity | The strong coupling physics of two dimensional gravity at C=7, 13, 19 is
deciphered, by building up on previous works along the same line (for a recent
review, of the background material, see hep-th/9408069). It is shown that
chirality becomes deconfined. The string suceptibility is derived, and found to
be real contra... | 9408076v1 |
1995-01-10 | Strong/Weak Coupling Duality from the Dual String | On compactification to six spacetime dimensions, the fundamental heterotic
string admits as a soliton a dual string whose effective worldsheet action
couples to the background fields of the dual formulation of six-dimensional
supergravity. On further toroidal compactification to four spacetime
dimensions, the dual stri... | 9501030v2 |
1995-03-18 | INSTANTON CALCULATIONS VERSUS EXACT RESULTS IN 4 DIMENSIONAL SUSY GAUGE THEORIES. | We relate the non-perturbative exact results in supersymmetry to perturbation
theory using several different methods: instanton calculations at weak or
strong coupling, a method using gaugino condensation and another method
relating strong and weak coupling. This allows many precise numerical checks of
the consistency ... | 9503115v1 |
1995-04-06 | One-loop Renormalization of Black Hole Entropy Due to Non-minimally Coupled Matter | The quantum entanglement entropy of an eternal black hole is studied. We
argue that the relevant Euclidean path integral is taken over fields defined on
$\alpha$-fold covering of the black hole instanton. The statement that
divergences of the entropy are renormalized by renormalization of gravitational
couplings in the... | 9504022v1 |
1995-04-18 | Integrable Quartic Potentials and Coupled KdV Equations | We show a surprising connection between known integrable Hamiltonian systems
with quartic potential and the stationary flows of some coupled KdV systems
related to fourth order Lax operators. In particular, we present a connection
between the Hirota-Satsuma coupled KdV system and (a generalisation of) the
$1:6:1$ integ... | 9504087v1 |
1995-06-14 | Gauge-Yukawa Unification and The Top Quark Mass | The principles of finiteness and reduction of couplings can be applied to
achieve Gauge-Yukawa Unification. It is found that the observed top-bottom
hierarchy and the top quark mass naturally follow if there exists Gauge-Yukawa
Unification which is a simple functional relation among the gauge coupling and
the Yukawa co... | 9506092v1 |
1995-06-21 | N=1 super-Chern-Simons coupled to parity-preserving matter from Atiyah-Ward space-time | In this letter, we present the Parkes-Siegel formulation for the massive
Abelian $N$$=$$1$ super-{\QED} coupled to a self-dual supermultiplet, by
introducing a chiral multiplier superfield. We show that after carrying out a
suitable dimensional reduction from ($2$$+$$2$) to ($1$$+$$2$) dimensions, and
performing some n... | 9506146v2 |
1995-07-03 | Interacting Wess-Zumino-Novikov-Witten Models | We study the system of two WZNW models coupled to each other via the
current-current interaction. The system is proven to possess the strong/weak
coupling duality symmetry. The strong coupling phase of this theory is
discussed in detail. It is shown that in this phase the interacting WZNW models
approach non-trivial co... | 9507004v1 |
1995-08-03 | Anisotropy beta functions | The flow of couplings under anisotropic scaling of momenta is computed in
$\phi^3$ theory in 6 dimensions. It is shown that the coupling decreases as
momenta of two of the particles become large, keeping the third momentum fixed,
but at a slower rate than the decrease of the coupling if all three momenta
become large s... | 9508014v1 |
1995-11-05 | Dilatonic gravity near two dimensions as a string theory | Using the renormalization-group formalism, a sigma model of a special type-
in which the metric and the dilaton depend explicitly on one of the string
coordinates only-is investigated near two dimensions. It is seen that dilatonic
gravity coupled to N scalar fields can be expressed in this form, using a
string parametr... | 9511031v1 |
1995-12-12 | Randomly coupled minimal models | Using 1-loop renormalisation group equations, we analyze the effect of
randomness on multi-critical unitary minimal conformal models. We study the
case of two randomly coupled $M_p$ models and found that they flow in two
decoupled $M_{p-1}$ models, in the infra-red limit. This result is then extend
to the case with $M$... | 9512087v2 |
1996-04-10 | Prepotential of N=2 SU(2) Yang-Mills gauge theory coupled with a massive matter multiplet | We discuss the N=2 SU(2) Yang-Mills theory coupled with a massive matter in
the weak coupling. In particular, we obtain the instanton expansion of its
prepotential. Instanton contributions in the mass-less limit are completely
reproduced. We study also the double scaling limit of this massive theory and
find that the p... | 9604051v2 |
1996-05-02 | One loop corrections to coupling constants in String Effective Field Theory | In the framework of a recently proposed method for computing exactly string
amplitudes regularized in the infra-red, I determine the one-loop correlators
for auxiliary fields in the symmetric $Z_2\times Z_2$ orbifold model. The
$D$-field correlation function turns out to give the one-loop corrections for
the gauge coup... | 9605012v1 |
1996-05-04 | 4 D Quantum N-Dilaton Gravity and One-Loop Divergence of Effective Action on Constant Dilaton | We consider 4D quantum gravity with N-dilatons with the most general
couplings. Especially, on constant dilaton and arbitrary metric background, we
show the structure of the divergent terms. We show the constraint between the
couplings necessary to cancel the coefficient of the square of the Wyle tensor.
Next we show t... | 9605025v1 |
1996-05-06 | SUSY Gauge Dynamics and Singularities of 4d N=1 String Vacua | Many N=1 heterotic string compactifications exhibit physically mysterious
singularities at codimension one in the moduli space of vacua. At these
singularities, Yukawa couplings of charged fields develop poles as a function
of the moduli. We explain these conformal field theory singularities, in a
class of examples, as... | 9605036v1 |
1996-05-23 | Interaction energy of Chern-Simons vortices in the gauged O(3) sigma model | The purpose of this Letter is to present a computation of the interaction
energy of gauged O(3) Chern-Simons vortices which are infinitely separated. The
results will show the behaviour of the interaction energy as a function of the
constant coupling the potential, which measures the relative strength of the
matter sel... | 9605177v1 |
1996-06-18 | A Canticle on (4,0) Supergravity-Scalar Multiplet Systems for a ``Cognoscente'' | Extending prior investigations, we study three of the the four distinct
minimal (4,0) scalar multiplets coupled to (4,0) supergravity. It is found that
the scalar multiplets manifest their differences at the component level by
possessing totally different couplings to the supergravity fields. Only the
SM-I multiplet po... | 9606108v1 |
1996-06-20 | Supergravity Coupled to Chiral and Yang-Mills Matter at One Loop | We present the full result for the divergent one-loop contribution to the
effective boson Lagrangian for supergravity coupled to chiral and Yang-Mills
supermultiplets. We also consider the specific case of dilaton couplings in
effective supergravity Lagrangians from superstrings, for which the one-loop
result is consid... | 9606135v1 |
1996-06-27 | A Yang--Mills Theory in Loop Space and Chapline--Manton Coupling | We consider a Yang--Mills theory in loop space whose gauge group is a
Kac--Moody group with the central extension. From this theory, we derive a
local field theory constructed of Yang--Mills fields and abelian antisymmetric
and symmetric tensor fields of the second rank. The Chapline--Manton coupling,
that is, coupling... | 9606178v1 |
1996-07-16 | The Branching of Graphs in 2-d Quantum Gravity | The branching ratio is calculated for three different models of 2d gravity,
using dynamical planar phi-cubed graphs. These models are pure gravity, the
D=-2 Gaussian model coupled to gravity and the single spin Ising model coupled
to gravity. The ratio gives a measure of how branched the graphs dominating the
partition... | 9607136v1 |
1996-07-30 | Spontaneous Symmetry Breaking at Two Loop in 3-d Massless Scalar Electrodynamics | In three dimensional Maxwell-Chern-Simons massless scalar electrodynamics
with $ \phi^6$ coupling, the $U(1)$ symmetry is spontaneously broken at two
loop order regardless of the presence or absence of the Maxwell term.
Dimensional transmutation takes place in pure Chern-Simons scalar
electrodynamics. The beta function... | 9607233v2 |
1996-08-28 | Chiral Decomposition For Non-Abelian Bosons | We study the non-abelian extension for the splitting of a scalar field into
chiral components. Using this procedure we find a non ambiguous way of coupling
a non abelian chiral scalar field to gravity. We start with a (non-chiral) WZW
model covariantly coupled to a background metric and, after the splitting,
arrive at ... | 9608187v1 |
1996-09-17 | Periods, Coupling Constants and Modular Functions in N=2 SU(2) SYM with Massive Matter | We determine the mass dependence of the coupling constant for N=2 SYM with
N_f=1,2,3 and 4 flavours. All these cases can be unified in one analytic
expression, given by a Schwarzian triangle function. Moreover we work out the
connection to modular functions which enables us to give explicit formulas for
the periods. Us... | 9609130v2 |
1996-10-28 | A Large N Chiral Transition on a Plaquette | We construct a model of a chiral transition using the well known large N
transition in two dimensional U(N) lattice gauge theory. Restricting the model
to a single plaquette, we introduce Grassmann variables on the corners of the
plaquette with the natural phase factors of staggered fermions and couple them
to the U(N)... | 9610225v1 |
1996-11-05 | String-Inspired Gravity Coupled to Yang-Mills Fields | String-inspired 1+1-dimensional gravity is coupled to Yang-Mills fields in
the Cangemi-Jackiw gauge-theoretical formulation, based on the extended
Poincar\'e group. A family of couplings, which involves metrics obtainable from
the physical metric with a conformal rescaling, is considered, and the
resulting family of mo... | 9611028v1 |
1996-11-07 | Renormalization In Coupled-Abelian Self-Dual Chern-Simons Models | An algebraic restriction of the nonabelian self-dual Chern-Simons-Higgs
systems leads to coupled-abelian self-dual models with intricate mass spectra.
The vacua are characterized by embeddings of SU(2) into the gauge algebra; and
in the broken phases, the gauge and real scalar masses are related to the
exponents of the... | 9611046v1 |
1996-11-18 | Flow of low energy couplings in the Wilson renormalization group | A new form of the Wilson renormalization group equation is derived, in which
the flow equations are, up to linear terms, proportional to a gradient flow. A
set of co\"ordinates is found in which the flow of marginal, low-energy,
couplings takes a gradient form, if relevant couplings are tuned to vanish. | 9611132v3 |
1997-01-13 | On the strongly coupled heterotic string | We analyze in detail the anomaly cancellation conditions for the strongly
coupled $E_8 \times E_8$ heterotic string introduced by Horava and Witten and
find new features compared to the ten-dimensional Green-Schwarz mechanism. We
project onto ten dimensions the corresponding Lagrangian of the zero-mode
fields. We find ... | 9701048v2 |
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