bluuebunny/crossref_metadata_2025 huggingface dataset:
TOWARDS SO(2, 10)-INVARIANT M-THEORY: MULTI-LAGRANGIAN FIELDS
Authors: MANVELYAN R. , MKRTCHYAN R.
Published: May 2003

The SO (2, 10) covariant extension of M-theory superalgebra is considered, with the aim to construct a correspondingly generalized M-theory, or 11-D supergravity. For the orbit corresponding to the 11-D supergravity multiplet, the simplest unitary representations of the bosonic part of this algebra, with sixth-rank tensor excluded, are constructed on a language of field theory in 66-D space–time. The main peculiarities are the presence of more than one equation of motion and the corresponding Lagrangians for a given field and that the gauge and SUSY invariances of the theory mean that the sum of variations of these Lagrangians (with different variations of the same field) is equal to zero.
A STUDY OF THE LEP AND SLD MEASUREMENTS OF Ab
Authors: FIELD J. H. , SCIARRINO D.
Published: May 2003

A systematic study is made of the data dependence of the parameter A b , that, since 1995, has shown a deviation from the Standard Model prediction of between 2.4 and 3.1 standard deviations. Issues addressed include: The effect of particular measurements, values found by individual experiments, LEP/SLD comparison, and the treatment of systematic errors. The effect, currently at the 2.4σ level, is found to vary in the range from 1.7σ to 2.9σ by excluding marginal or particularly sensitive data. Since essentially the full LEP and SLD Z-decay data sets are now analyzed the meaning of the deviation, (new physics or marginal statistical fluctuation) is unlikely to be given by the present generation of colliders.
NEUTRINO PROPAGATION IN AGN ENVIRONMENT
Authors: SAHU SARIRA , BANNUR VISHNU M.
Published: May 2003

Assuming the violation of equivalence principle (VEP) by ultra high energy AGN neutrinos we study the effect of random magnetic field fluctuation on conversion of electron neutrinos to tau anti-neutrinos.
IMPLICATION OF DECOUPLING EFFECTS FOR ONE-LOOP CORRECTED EFFECTIVE ACTIONS FROM SUPERSTRING THEORY
Authors: BUCHBINDER I. L. , PETROV A. YU. , CVETIČ M.
Published: May 2003

We study the decoupling effects in one-loop corrected N = 1 supersymmetric theory with gauge neutral chiral superfields, by calculating the one-loop corrected effective Lagrangian that involves light and heavy fields with the mass scale M, and subsequently eliminating heavy fields by their equations of motion. In addition to new non-renormalizable couplings, we determine the terms that grow as log M. In a model derived from superstring theory, these terms can significantly modify low-energy predictions for the effective couplings of light fields. For example, in a class of heterotic superstring vacua with an anomalous U(1) the vacuum restabilization introduces such decoupling effects which in turn correct the low energy predictions for certain couplings by 10–50%.
VACUUM POLARIZATION OF MASSIVE SCALAR FIELDS ON THE BLACK HOLE HORIZON
Authors: KOYAMA HIROKO , NAMBU YASUSADA , TOMIMATSU AKIRA
Published: May 2003

Vacuum polarization of massive scalar fields in a thermal state at arbitrary temperature is studied near the horizon of a Reissner–Nordström black hole. We derived an analytic form of <ϕ2> approximately in the large mass limit near the black hole horizon. We uses the zeroth order WKB approximation and power series expansion near the horizon for the Euclideanized mode function. Our formula for the vacuum polarization shows regular behavior on the horizon if the temperature of the scalar field is equal to the Hawking temperature of the black hole. The finite part of the vacuum polarization agrees with the result of the DeWitt–Schwinger approximation up to O(m-4) which is the next-to-leading order of the expansion.
MØLLER ENERGY FOR THE KERR–NEWMAN METRIC
Authors: XULU S. S.
Published: May 2003

The energy distribution in the Kerr–Newman space–time is computed using the Møller energy–momentum complex. This agrees with the Komar mass for this space–time obtained by Cohen and de Felice. These results support the Cooperstock hypothesis.
COMMENT ON EQUAL VELOCITY ASSUMPTION FOR NEUTRINO OSCILLATIONS
Authors: OKUN L. B. , TSUKERMAN I. S.
Published: May 2003

The so-called equal velocity prescription for neutrino oscillations is forbidden kinematically.
FORMULATION OF NEGATIVELY CHARGED PARTICLE RAPIDITY DISTRIBUTION IN NUCLEUS–NUCLEUS COLLISIONS AT HIGH ENERGY
Authors: LIU FU-HU
Published: May 2003

The negatively charged particle rapidity distribution in nucleus–nucleus collisions at high energy has been described by the thermalized cylinder picture. The calculated results are compared and found to be in agreement with the experimental data of the reactions 16 O + Au at 60A and 200A GeV, 32 S + Ag and S at 200A GeV, and 208 Pb + Pb at 158A GeV bombarding energies.
HIGGS PROPAGATOR IN THE PRESENCE OF STRONG DYNAMICS IN THE ELECTROWEAK SECTOR
Authors: DESAI BIPIN R. , VAUCHER ALEXANDER R.
Published: May 2003

The Higgs propagator, in the presence of strong top-Yukawa coupling, is expressed in the form of dispersion integrals so that unitarity in top–antitop scattering amplitude is maintained. It is found that a large top-Yukawa coupling lowers the Higgs mass from the condensate-model value of twice the top mass (≈350 GeV) to 100–200 GeV consistent with the Z0 width precision measurements. The coupling is found to be ≈3.7 at the top-mass, much larger than the Standard Model value ≈1. It corresponds to a compositeness scale ≈1.4 TeV, which is consistent with top-color models. A second scalar state around 1 TeV also emerges as a solution in combination with the low mass Higgs.
BOOTSTRAP OF THE SCALAR SECTOR IN TOP–ANTITOP SCATTERING AMPLITUDE
Authors: DESAI BIPIN R. , VAUCHER ALEXANDER R.
Published: May 2003

Based on the top-condensate model of Nambu and Bardeen et al., it is pointed out that a bootstrap of the scalar sector occurs in top–antitop scattering amplitude in that the ladder sum of Higgs pole exchange diagrams in one channel reproduces a Higgs pole in the crossed-channel. This result is exact whenever color flows simultaneously in both channel directions e.g. for Nc = 1. Solutions are obtained that are compatible with the condensate models such as the top-color models which imply large top-Yukawa couplings at the top mass.
MINIMAL EXTENDED FLAVOR GROUPS, MATTER FIELDS CHIRAL REPRESENTATIONS, AND THE FLAVOR QUESTION
Authors: DOFF A. , PISANO F.
Published: May 2003

We show the specific unusual features on chiral gauge anomalies cancellation in the minimal, necessarily 3-3-1, and the largest 3-4-1 weak isospin chiral gauge semisimple group leptoquark–bilepton extensions of the 3-2-1 conventional standard model of nuclear and electromagnetic interactions. In such models a natural answer for the fundamental question of fermion generation replication arises directly from the self-consistency of a local gauge quantum field theory, which constrains the number of the QFD fermion families to the QCD color charges.
WEYL-ORDERED POLYNOMIALS STUDIED BY VIRTUE OF THE IWWOP TECHNIQUE
Authors: FAN HONG-YI
Published: May 2003

We investigate the properties of the Weyl-ordered polynomials Tm,n by the technique of integration within a Weyl-ordered product (IWWOP) and the Weyl quantization rule. The introduction of the Weyl-ordering symbol ⋮⋮ and the IWWOP provide us with a convenient approach for deriving the Weyl-ordered form of the product of Tm,n and other operators. The Weyl-ordered Dirac's δ-function form of the Wigner operator can also directly lead us to the Weyl quantization formalism for the functions of radial vaiables.
TOPOLOGICAL QUANTIZATION OF THE MAGNETIC FLUX
Authors: WISNIVESKY DANIEL
Published: May 2003

We discuss the quantum problem of a charged particle in a multiply connected region encircling a magnetic tube, using a theory in which space and internal coordinates are derived from the parameters of a linear group of transformations (group space quantum theory). Based only on symmetry considerations, we show that, the magnetic flux in the tube must be quantized in multiples of the Dirac monopole charge.
DELTA MATTER FORMATION IN DENSE ASYMMETRIC NUCLEAR MEDIUM
Authors: DE OLIVEIRA J. C. T. , KYOTOKU M. , CHIAPPARINI M. , RODRIGUES H. , DUARTE S. B.
Published: May 2003

In the context of a relativistic mean field theory the delta-resonance matter formation in a highly compressed nuclear medium is investigated. For a given set of nucleon–meson coupling constants, the delta-resonance formation is studied by changing the delta-meson coupling constants. The effect on the equation of state and on the delta-resonance population with respect to changes in the delta-resonance coupling constants values is discussed for very asymmetric and quasi-symmetric nuclear matter, as an extension of works restricted to the symmetric nuclear matter treatment.5,6
THE STATUS OF THE SOLAR NEUTRINO PROBLEM IN THE RESONANT SPIN-FLAVOR PRECESSION SCENARIO WITH TWISTING SOLAR MAGNETIC FIELDS
Authors: DEV S. , SHARMA JYOTI DHAR
Published: May 2003

Resonant spin-flavor precession scenario with twisting solar magnetic fields has been confronted with the solar neutrino data from various ongoing experiments. In particular, the anticorrelation apparent in the Homestake solar neutrino data has been taken seriously to constrain the twisting profiles of the magnetic field in the convective zone of the Sun. The twisting profiles, thus derived, have been used to calculate the neutrino detection rates for the Homestake, Kamiokande (super-Kamiokande) and the gallium experiments. It is found that the presence of twisting reduces the degree of anticorrelation in all the solar neutrino experiments. However, the anticorrelation in the Homestake experiment is expected to be more pronounced. Moreover, the anticorrelation of solar neutrino flux emerging from the southern solar hemisphere is expected to be stronger than that for the neutrinos emerging from the northern solar hemisphere.
MESONS DISTRIBUTION AMPLITUDES IN THE "NAIVE NON-ABELIANIZATION" APPROXIMATION AND POWER-SUPPRESSED CORRECTIONS TO FM (Q2)
Authors: AGAEV SHAHIN S. , MUKHTAROV ABDULLA I. , MAMEDOVA YEGANA V.
Published: May 2003

Power-suppressed corrections to the light pseudoscalar (π, K) and longitudinally polarized ρ-meson electromagnetic form factors FM (Q2) are estimated by means of the running coupling constant method. In calculating the mesons distribution amplitudes (DAs) found, the "naive non-abelianization" approximation is used. Comparisons are made with FM(Q2) obtained using the "ordinary" DAs and running coupling constant method, as well as with frozen coupling approximation's results.
GEOMETRIZATION OF THE LAX PAIR TENSORS
Authors: BALEANU D. , BAŞKAL S.
Published: May 2003

The tensorial form of the Lax pair equations are given in a compact and geometrically transparent form in the presence of Cartan's torsion tensor. Three-dimensional space–times admitting Lax tensors are analyzed in detail. Solutions to Lax tensor equations include interesting examples as separable coordinates and the Toda lattice.
NONSTATIC GLOBAL STRING IN BRANS–DICKE THEORY
Authors: SEN A. A. , BANERJEE N.
Published: May 2003

Gravitational field of a nonstatic global string has been studied in the context of Brans–Dicke theory of gravity. Both the metric components and the BD scalar field are assumed to be nonseparable functions of time and space. The space–time may or may not have any singularity at a finite distance from the string core but the singularity at a particular time always remains. It has been shown that the space–time exhibits both outgoing and incoming gravitational radiation.
THE LIGHT SCALAR BOTTOM QUARK AND c→uγ DECAY
Authors: BOZ M. , KIRCA Z.
Published: May 2003

In this work, we analyze c→uγ decay in supersymmetry for a light sbottom with heavy scalar fermions of the first two generations. Assuming that all generation changing entries of the sfermion mass matrices vanish and, thus considering only chargino, charged Higgs and W-boson contributions only, we calculate the Wilson coefficients and the decay rate at μ=mc level. It is found that, for low tan β regime the decay rate is enhanced up to 5% with respect to the SM. The results presented here are expected to be checked in the CHORUS experiment in the near future.
A NOTE ON SUPERSYMMETRIC WZW TERM IN FOUR DIMENSIONS
Authors: NITTA MUNETO
Published: May 2003

We reconsider the supersymmetric Wess–Zumino–Witten (SWZW) term in four dimensions. It has been known that the manifestly supersymmetric form of the SWZW term includes derivative terms on auxiliary fields, the highest components of chiral superfields, and then we cannot eliminate them by their equations of motion. We discuss a possibility for the elimination of such derivative terms by adding total derivative terms. Although most of the derivative terms can be eliminated in this way, we find that all the derivative terms can be canceled, if and only if an anomalous term in SWZW term vanishes. As a by-product, we find the first example of a higher derivative term free from such problem.
ONE-LOOP DIVERGENCES OF QUANTUM GRAVITY USING CONFORMAL PARAMETRIZATION
Authors: DE BERREDO-PEIXOTO GUILHERME , PENNA-FIRME ANDRÉ , SHAPIRO ILYA L.
Published: May 2003

We calculate the one-loop divergences for quantum gravity with cosmological constant, using new parametrization of quantum metric. The conformal factor of the metric is treated as an independent variable. As a result the theory possesses an additional degeneracy and one needs an extra conformal gauge fixing. We verify the on-shell independence of the divergences from the parameter of the conformal gauge fixing, and find a special conformal gauge in which the divergences coincide with the ones obtained by 't Hooft and Veltman (1974). Using conformal invariance of the counterterms, one can restore the divergences for the conformal metric–scalar gravity.
MICROSCOPIC STUDY OF THE EFFECT OF HEXADECAPOLE DEFORMATION ON BOTH FUSION CROSS-SECTION AND BARRIER DISTRIBUTION
Authors: ISMAIL M. , GHAZAL A. SH.
Published: May 2003

The interaction potential for deformed-spherical nuclear pair is derived microscopically in the framework of double folding model with M3Y-Paris nucleon–nucleon interaction. The heavy target nucleus 238 U together with the light projectile nucleus 16 O are considered as an example. The exchange part of the heavy ion (HI) potential has been calculated using finite-range exchange NN force instead of the zero-range pseudoforce. Neutron thickness and the difference in kinetic energy densities between neutrons and protons have been taken into consideration in calculating the exchange HI potential. For this pair the fusion cross-section as well as the barrier distribution are calculated. These calculations have been done using three different values of hexadecapole deformation parameter of 238 U . The effect of using both the finite-range exchange NN force and the hexadecapole deformation on the fusion cross-section and the barrier distribution have been discussed.
THE AdS/CFT CORRESPONDENCE IN TWO DIMENSIONS
Authors: CADONI MARIANO , CARTA PAOLO
Published: May 2003

We review recent progress in understanding the anti-de Sitter/conformal field theory correspondence in the context of two-dimensional (2D) dilaton gravity theory.
POISSON SIGMA MODELS AND DEFORMATION QUANTIZATION
Authors: CATTANEO ALBERTO S. , FELDER GIOVANNI
Published: May 2003

This is a review aimed at the physics audience on the relation between Poisson sigma models on surfaces with boundary and deformation quantization. These models are topological open string theories. In the classical Hamiltonian approach, we describe the reduced phase space and its structures (symplectic groupoid), explaining in particular the classical origin of the noncommutativity of the string endpoint coordinates. We also review the perturbative Lagrangian approach and its connection with Kontsevich's star product. Finally we comment on the relation between the two approaches.
MULTILOOP NONCOMMUTATIVE OPEN STRING THEORY AND THEIR QFT LIMIT
Authors: CHU CHONG-SUN , RUSSO RODOLFO
Published: May 2003

The multiloop amplitudes for open bosonic string in the presence of a constant B-field are derived from first principles. The basic ingredients of the construction are the commutation relations for the string modes and the Reggeon vertex describing the interaction among three generic string states. The modifications due to the presence of the B-field affect nontrivially only the zero modes. This makes it possible to write in a simple and elegant way the general expression for multiloop string amplitudes in the presence of a constant B-field. The field theory limit of these string amplitudes is also considered. We show that it reproduces exactly the Feynman diagrams of noncommutative field theories. Issues of uv/ir are briefly discussed.
QUANTUM FIELD THEORY ON NONCOMMUTATIVE SPACE–TIME: THE RELATION BETWEEN ULTRAVIOLET BEHAVIOUR, TOPOLOGY AND SYMMETRY
Authors: CHAICHIAN M. , DEMICHEV A. , PREŠNAJDER P.
Published: May 2003

We study properties of a scalar quantum field theory on two-dimensional noncommutative space–times. We show that ultraviolet behaviour of a field theory on noncommutative spaces is sensitive to the topology of the space–time, namely to its compactness. The compactness of space-like coordinates implies discreteness of the time variable which leads to appearance of unphysical modes and violation of unitarity even in the absence of a star-product in the interaction terms. Thus, this conclusion holds also for other quantum field theories with discrete time.
SPACE–TIME SUPERALGEBRAS IN ANY DIMENSIONS
Authors: FERRARA S.
Published: May 2003

Superconformal algebras in space–time of arbitrary dimension and signature are considered and their relation to super-Poincaré algebras outlined.
UNBRAIDING TRANSFORMATIONS FOR BRAIDED TENSOR FACTORS
Authors: FIORE GAETANO , STEINACKER HAROLD , WESS JULIUS
Published: May 2003

Two quantum group covariant algebras [Formula: see text] can be embedded in a larger one through the so-called braided tensor product, whereby they do not commute with each other. We briefly report on our transformations of generators8 which allow to express this braided tensor product algebra as an ordinary tensor product algebra of [Formula: see text] with a subalgebra isomorphic to [Formula: see text] and commuting with [Formula: see text]. The construction of the transformations is based on the existence of a realization of H within [Formula: see text]. We apply the results to the braided tensor product algebras of two or more quantum group covariant quantum spaces or deformed Heisenberg algebras.
AXIAL GAUGED NONCOMMUTATIVE U(2)/U(1) WESS–ZUMINO–WITTEN MODEL
Authors: GHEZELBASH AMIR MASOUD
Published: May 2003

We construct various kinds of gauged noncommutative WZW models. In particular, axial gauged noncommutative U (2)/ U (1) WZW model is studied and by integrating out the gauge fields, we obtain a noncommutative nonlinear σ-model.
SPECTRAL QUADRUPLES
Authors: KOPF TOMÁŠ , PASCHKE MARIO
Published: May 2003

A set of data is supposed to give possible axioms for space–times. It is hoped that such a proposal can serve to become a testing ground on the way to a general formulation. At the moment, the axioms are known to be sufficient for cases with a sufficient number of symmetries, in particular for 1+1 de Sitter space–time.
THE HOPF ALGEBRA OF CONNES AND KREIMER AND WAVE FUNCTION RENORMALIZATION
Authors: GIRELLI FLORIAN , MARTINETTI PIERRE , KRAJEWSKI THOMAS
Published: May 2003

In this letter, we show how the Connes–Kreimer Hopf algebra morphism can be extended when taking into account the wave function renormalization. This leads us to a semi-direct product of invertible power series by formal diffeomorphisms.
DEFORMED SUPERSYMMETRIC FIELD THEORIES
Authors: LLEDÓ M. A.
Published: May 2003

We make a short review on the Moyal–Weyl star products with emphasis in its convergence. We consider field theories on a deformed superspace and analyze the compatibility of such products with supersymmetry. We investigate some aspects of the Wess–Zumino model, super-Yang–Mills theories and analyze the correspondence of the latter with the supersymmetric Born–Infeld action.
CHIRAL GAUGE ANOMALIES ON NONCOMMUTATIVE MINKOWSKI SPACE–TIME
Authors: MARTÍN C. P.
Published: May 2003

Chiral gauge anomalies on noncommutative Minkowski space–time are computed and have their origin elucidated. The consistent form and the covariant form of the anomaly are obtained. Both Fujikawa's method and Feynman diagram techniques are used to carry out the calculations.
POISSON STRUCTURES ON THE GALILEI GROUP
Authors: BRIHAYE Y. , KOWALCZYK E. , MAŚLANKA P.
Published: May 2003

Poisson–Lie structures on the Galilei group are completely classified.
ASPECTS OF THE q-DEFORMED FUZZY SPHERE
Authors: STEINACKER HAROLD
Published: May 2003

These notes are a short review of the q-deformed fuzzy sphere [Formula: see text], which is a "finite" noncommutative two-sphere covariant under the quantum group U q( su (2)). We discuss its real structure, differential calculus and integration for both real q and q a phase, and show how actions for Yang–Mills and Chern–Simons-like gauge theories arise naturally. It is related to D-branes on the SU (2)k WZW model for [Formula: see text].
DISCRETE NONCOMMUTATIVE GAUGE THEORY
Authors: SZABO RICHARD J.
Published: May 2003

A review of the relationships between matrix models and noncommutative gauge theory is presented. A lattice version of noncommutative Yang–Mills theory is constructed and used to examine some generic properties of noncommutative quantum field theory, such as uv/ir mixing and the appearance of gauge-invariant open Wilson line operators. Morita equivalence in this class of models is derived and used to establish the generic relation between noncommutative gauge theory and twisted reduced models. Finite-dimensional representations of the quotient conditions for toroidal compactification of matrix models are thereby exhibited. The coupling of noncommutative gauge fields to fundamental matter fields is considered and a large mass expansion is used to study the properties of gauge-invariant observables. Morita equivalence with fundamental matter is also presented and used to prove the equivalence between the planar loop renormalizations in commutative and noncommutative quantum chromodynamics.
EMBEDDING AS A SUBSTITUTE FOR THE KRUSKAL MAXIMAL EXTENSION
Authors: BECIU MIRCEA , CULETU HRISTU
Published: May 2003

We consider the Minkowski embedding space of the Reissner–Nordstrom solution to show that the embedding space plays the same role as the Kruskal maximal extension. We point out that a static observer in Reissner–Nordstrom exterior geometry is a particular kind of uniformly accelerated observer in the six-dimensional Minkowski embedding space and therefore he experiences a thermal bath of Rindler particles. However, since the static observer is restricted to a 4-D manifold, his horizon, unlike accelerated observer's horizon, is finite and so is the entropy.
PETROV TYPE I, STATIONARY, AXISYMMETRIC, PERFECT FLUID SOLUTION OF EINSTEIN'S EQUATIONS
Authors: KYRIAKOPOULOS E.
Published: May 2003

We present a four-parameter, algebraically general solution for the interior of a rigidly rotating, axisymmetric perfect fluid, with the equation of state μ = p + const . The solution is analytically simple and has a static limit.
BPS ANALYSIS OF THE CHARGED SOLITON SOLUTIONS OF D-BRANE WORLD VOLUME THEORY FROM THE VIEWPOINT OF TARGET-SPACE SUPERSYMMETRY
Authors: SUZUKI TOSHIYA
Published: May 2003

We investigate BPS properties of the charged soliton solutions of D-brane world volume theory, which is described by the supersymmetric Dirac–Born–Infeld action, by means of the N=2 target-space supersymmetry algebra. Our results agree with those obtained previously. We also extend our BPS analysis to the case where axion background exists.
HIGHER DERIVATIVE SUPERSYMMETRY, A MODIFIED CRUM–DARBOUX TRANSFORMATION AND COHERENT STATE
Authors: BAGCHI B. , GANGULY A. , BHAUMIK D. , MITRA A.
Published: May 2003

Inspired by the possibility of factorizing the second derivative interwining operators using a modified form of the well-known Crum–Darboux transformation, we present a scheme for generating a new pair of isospectral potentials. We also consider the interesting problem of constructing coherent states for such factorizable operators.
LIMITS ON A STRONG ELECTROWEAK SECTOR FROM $\lc{e}^+\lc{e}^-\rightarrow\gamma\gamma+E\hskip-0.56em/$ AT LEP2
Authors: ZERWEKH ALFONSO R. , ROSENFELD ROGERIO
Published: May 2003

We study the process [Formula: see text] in the context of a strong electroweak symmetry breaking model, which can be a source of events with two photons and missing energy at LEP2. We investigate bounds on the model assuming that no deviation is observed from the standard model within a given experimental error.
REMARKS ON THE "NEW REDSHIFT INTERPRETATION"
Authors: CARLIP S. , SCRANTON R.
Published: May 2003

In a recent article,1 Gentry proposed a new static cosmological model that seeks to explain the Hubble relation as a combination of gravitational and Doppler redshifts. We show that Gentry's model, although supposedly based on general relativity, is inconsistent with the Einstein field equations: (a) it requires delicate fine tuning of initial conditions; (b) it is highly unstable, both gravitationally and thermodynamically; and (c) its predictions disagree clearly with observation.
SYMPLECTIC GEOMETRY ON QUANTUM PLANE
Authors: ALBEVERIO SERGIO , FEI SHAO-MING
Published: May 2003

A study of symplectic forms associated with two-dimensional quantum planes and the quantum sphere in a three-dimensional orthogonal quantum plane is provided. The associated Hamiltonian vector fields and Poissonian algebraic relations are made explicit.
Z TEST FOR QCD
Authors: HARI DASS N. D. , SONI V.
Published: May 2003

This letter provides an explicit and constructive test of QCD by comparing it with an alternative theory that has the same attributes of asymptotic freedom and chiral symmetry and further becomes congruent with QCD at leading order in the uv. Presently, it can be distinguished from QCD, on extending these theories to the full electroweak theory, only by the Z particle width.
A PROPOSAL FOR A GENERALIZED CANONICAL osp(1, 2) QUANTIZATION OF DYNAMICAL SYSTEMS WITH CONSTRAINTS
Authors: LAVROV PETR M. , NETO JORGE ANANIAS , OLIVEIRA WILSON
Published: May 2003

The aim of this letter is to consider the possibility of constructing a generalized canonical quantization method for arbitrary dynamical systems with first-class constraints based on the osp (1, 2) supersymmetry principle. This proposal can be considered as a counterpart to the osp (1, 2)-covariant Lagrangian quantization method introduced recently by Geyer, Lavrov and Mülsch. The gauge dependence of Green's functions is studied. It is shown that if the parameter m2 of the osp (1, 2) superalgebra is not equal to zero, then the vacuum functional and S-matrix depend on the gauge. In the limit m→0 the gauge independence of vacuum functional and S-matrix are restored. The Ward identities related to the osp (1, 2) symmetry are derived.
6-D BLACK STRING AS A MODEL OF THE AdS/CFT CORRESPONDENCE
Authors: MYUNG Y. S. , KIM N. J. , LEE H. W.
Published: May 2003

We discuss the entropy for the extremal BTZ black hole and the extremal EBTZ black hole. The EBTZ black hole means the BTZ black hole embedded in a five-dimensional (5-D) black hole. The six-dimensional (6-D) black string with traveling waves is introduced as a concrete model for realizing the AdS/CFT correspondence. The traveling waves carry the momentum distribution p(u) which plays an important role in counting the entropy and establishing the correspondence. It turns out that the EBTZ black hole is consistent with the AdS/CFT correspondence.
THE TYPES OF AXISYMMETRIC EXACT SOLUTIONS CLOSELY RELATED TO n-SOLITONS FOR YANG–MILLS–HIGGS THEORY
Authors: ZHONG ZAI ZHE
Published: May 2003

In this letter, we point out that if a symmetric 2×2 real matrix M(ρ,z) obeys the Belinsky–Zakharov equation and | det (M)|=1, then an axisymmetric Bogomol'nyi field exact solution for the Yang–Mills–Higgs theory can be given. By using the inverse scattering technique, some special Bogomol'nyi field exact solutions, which are closely related to the true solitons, are generated. In particular, the Schwarzschild-like solution is a two-soliton-like solution.
INFRARED QUASI-FIXED POINTS AND MASS PREDICTIONS IN THE MSSM
Authors: YEGHIYAN G. K. , JURČIŠIN M. , KAZAKOV D. I.
Published: May 2003

We consider the infrared quasi-fixed point solutions of the renormalization group equations for the top-quark Yukawa coupling and soft supersymmetry breaking parameters in the MSSM. The ir quasi-fixed points together with the values of the gauge couplings, the top-quark and Z-boson masses allow one to predict masses of the Higgs bosons, the stop squarks and the lightest chargino as functions of the only free parameter m1/2 or the gluino mass. The mass of the lightest Higgs boson for μ>0 and M SUSY ≈ 1 TeV is found to be mh = (94.3+1.6+0.6±5±0.4) GeV. The case with μ<0 is excluded by experimental data.
BEAUTY-CONSERVING STRANGENESS-CHANGING TWO-BODY HADRONIC DECAYS OF BEAUTY BARYONS
Authors: SINHA SONALI , KHANNA M. P.
Published: May 2003

The beauty-conserving strangeness-changing two-body hadronic decays of beauty baryons are examined. Unlike in charm sector where the heavy flavor conserving but strangeness-changing decays are Cabibbo suppressed, in the b-sector they are CKM allowed. The numerical estimates for decay widths of some of the modes are presented in current algebra approach, factorization and quark diagram approach.
A MODIFIED SCHEME OF TRIPLECTIC QUANTIZATION
Authors: GEYER B. , GITMAN D. M. , LAVROV P. M.
Published: May 2003

A modified version of well-known triplectic quantization proposed by Batalin and Marnelius is given.
CAN THE SUPER-KAMIOKANDE ATMOSPHERIC DATA PREDICT THE SOLAR NEUTRINO DEFICIT?
Authors: STANCU ION
Published: May 2003

In this letter we show that the evidence for neutrino oscillations from the super-Kamiokande atmospheric neutrino data fully determines the 3×3 neutrino-oscillations mixing matrix and predicts an energy-independent solar neutrino deficit at the level of 45%. This corresponds to a ratio of measured to predicted neutrino flux of [Formula: see text], in good agreement with the experimental results. We achieve this result within the framework of a minimal, three-generation neutrino mixing, with mass squared differences of ΔM2≃0.45 eV 2 and [Formula: see text]. The mixing matrix derived here is characterized by the mixing angles θ=35.1°, β=5.5° and ψ=23.3°, and a vanishing CP-violating phase, δ=0.
CHIRAL SYMMETRY BREAKING AS A CONSEQUENCE OF NONTRIVIAL SPATIAL TOPOLOGY
Authors: SITENKO YURII A.
Published: May 2003

A singular configuration of external static magnetic field in the form of a pointlike vortex polarizes the vacuum of quantized massless spinor field in (2+1)-dimensional space–time. This results in an analogue of the Bohm–Aharonov effect: the chiral symmetry breaking condensate, energy density and current emerge in the vacuum even in the case when the spatial region of nonvanishing external field strength is excluded. The dependence of the vacuum characteristics both on the value of the vortex flux and on the choice of the boundary condition at the location of the vortex is determined.
CLASSICAL DESCRIPTION OF SPINNING DEGREES OF FREEDOM OF RELATIVISTIC PARTICLES BY MEANS OF COMMUTING SPINORS
Authors: DERIGLAZOV A. A. , GITMAN D. M.
Published: May 2003

We consider a possibility of describing spin one-half and higher spins of massive relativistic particles by means of commuting spinors. We present two classical gauge models with the variables xμ, ξα, χα, where ξ, χ are commuting Majorana spinors. In the course of quantization both models reproduce Dirac equation. We analyze the possibility of introducing an interaction with an external electromagnetic background into the models and generalizing them to higher spin description. The first model admits a minimal interaction with the external electromagnetic field, but leads to reducible representations of the Poincaré group being generalized for higher spins. The second model turns out to be appropriate for description of the massive higher spins. However, it seems to be difficult to introduce a minimal interaction with an external electromagnetic field into this model. We compare our approach with one, which uses Grassmann variables, and establish a relation between them.
ON PATH-DEPENDENT STATE SPACE FOR THE PROCA FIELD
Authors: GAITAN ROLANDO
Published: May 2003

A gauge formulation for the Proca model quantum theory in an open path functional space representation is revisited. The path-dependent vacuum state and the functional integration measure needed to define an internal product in the state space are obtained. Finally, a possible scheme for the construction of creation–annihilation path-dependent operators is presented.
OPERATOR REGULARIZATION, SCALE AND CONFORMAL ANOMALIES FOR THE LANDAU PROBLEM
Authors: KAMATH S. G.
Published: May 2003

Adopting the Fujikawa method wherein anomalies are calculated with regulated Jacobians, the Schwinger expansion for [Formula: see text] where [Formula: see text] and [Formula: see text] are operators is used herein to obtain the scale and conformal anomalies for the Landau problem. This approach differs from the conventional method in which a change of basis from eigenstates of the regulator to plane waves is adopted; however the anomalies worked out here match exactly with the results obtained earlier by the author with the usual method.
SCALE INVARIANCE AND VACUUM ENERGY
Authors: GUENDELMAN E. I.
Published: May 2003

The possibility of mass in the context of scale-invariant, generally covariant theories, is discussed. Scale invariance is considered in the context of a gravitational theory where the action, in the first-order formalism, is of the form [Formula: see text] where Φ is a density built out of degrees of freedom independent of the metric. For global scale invariance, a "dilaton" ϕ has to be introduced, with nontrivial potentials V(ϕ)=f1eαϕ in L1 and U(ϕ)=f2e2αϕ in L2. This leads to nontrivial mass generation and a potential for ϕ which is interesting for new inflation. Scale invariant mass terms for fermions lead to a possible explanation of the present day accelerated universe and of cosmic coincidences.
ANALYZING POWERS IN INCLUSIVE PION PRODUCTION AT HIGH ENERGY AND THE NUCLEON SPIN STRUCTURE
Authors: SUZUKI K. , NAKAJIMA N. , TOKI H. , KUBO K.-I.
Published: May 2003

Analyzing powers in inclusive pion production in high energy transversely polarized proton–proton collisions are studied theoretically in the framework of the quark recombination model. Calculations by assuming the SU(6) spin-flavor symmetry for the nucleon structure disagree with the experiments. We solve this difficulty by taking into account the realistic spin distribution functions of the nucleon, which differs from the SU(6) expectation at large x, with a perturbative QCD constraint on the ratio of the unpolarized valence distributions, u/d→5 as x→ 1. We also discuss the kaon spin asymmetry and find AN(K+)=-AN(K0) in the polarized proton–proton collisions at large x F .
CRUCIAL DEPENDENCE OF "PRECARIOUS" AND "AUTONOMOUS" ϕ4's UPON THE NORMAL-ORDERING MASS
Authors: LU WEN-FA
Published: May 2003

Using the Gaussian wave functional approach with the normal-ordering renormalization prescription, we show that for the (3+1)-dimensional massive λϕ4 theory, "precarious" and "autonomous" ϕ4's can exist if and only if the normal-ordering mass is equal to the classical masses at the symmetric and asymmetric vacua, respectively.
INTRODUCTION TO THE NON-PERTURBATIVE RENORMALIZATION GROUP AND ITS RECENT APPLICATIONS
Authors: AOKI KEN-ICHI
Published: May 2003

We introduce the basic ideas and the framework of the non-perturbative renormalization group particularly for pedestrians using elementary examples. First we briefly review the history of the renormalization theory and the renormalization group. We will make it clear that the modern renormalization theory is constructed on the idea of the renormalization group and it is quite a new type of theory in physics.

Then we derive the exact non-perturbative renormalization group equation and set up its systematic approximation method. The lowest order approximation called the local potential approximation is applied to scalar theories with the ferromagnetic transition and quantum mechanics with tunneling. We compare our results with other methods, and will show that the non-perturbative renormalization group method is promising since it gives fairly good results already in the lowest order approximation and it does not suffer any divergent series expansion.

As a typical application in high energy physics, we analyze the dynamical chiral symmetry breaking in gauge theories and investigate the chiral phase structures. Our new method improves results by the ladder Schwinger–Dyson equation so that the physical results might be less gauge dependent.
RENORMALIZATION AND ASYMPTOTICS
Authors: OONO Y.
Published: May 2003

After a gentle introduction to the Stückelberg–Petermann style (i.e. field-theoretical) renormalization group (RG) theory, its application to the study of asymptotic behaviors of differential equations is explained through simple examples. The essence of singular perturbation methods to study asymptotic behaviors of differential equations is to reduce it to equations governing long time scale behaviors (i.e. the so-called reductive perturbation). The RG approach gives the reduced equation as an RG equation (this is called the reductive renormalization group approach). Once the RG equation is written down, the asymptotic behavior can be obtained by solving it. The RG equation also facilitates the error analysis of the asymptotic solutions. A new approach via "proto-RG equation" explained in this article further simplifies the reductive use of RG. For example, to the lowest nontrivial order the approach does not require any explicit calculation of perturbative results.
QCD — MOTIVATED QUARK STARS IN THE LIGHT OF RECENT ASTROPHYSICAL OBSERVATIONS
Authors: DEY MIRA , BOMBACI IGNAZIO , DEY JISHNU , RAY SUBHARTHI , VAN DEN HEUVEL E. P. J. , LI X.-D.
Published: May 2003

Are there quark stars in nature? We review the question in the light of modern astrophysical observations. Quark stars have properties which are very similar to those of neutron stars. For example they are now known to have the same kind of cooling properties. Their masses may also be similar. On the other hand, gamma ray bursts (GRB), the brightest phenomenon observable at present in the sky, could possibly be conversion of normal or neutron matter on the surface of a quark star.

The best observational evidence for the existence of quark stars seems to be some compact objects, the X-Ray burst source 4U 1820-30, the X-ray pulsar Her X-1, the star 4U 1728-34 and SAX J-1808.4-3658, this last one being the stablest and fastest rotating hard X-ray pulsar known to date. The mass of at least these four objects is high and their radius is low, placing them close to the black hole line, in the mass–radius (M–R) plot.
BLACK HOLES, INFORMATION PUZZLE AND STRING THEORY
Authors: WADIA SPENTA R.
Published: May 2003

We briefly review developments in string theory which explain the information puzzle that arises in the applications of quantum mechanics to black holes.
WHEN RADIATIVE CORRECTIONS ARE FINITE, BUT UNDETERMINED
Authors: JACKIW R.
Published: May 2003

In quantum field theory radiative corrections can be finite but undetermined.
COUPLED CLUSTER METHODS FOR LATTICE GAUGE THEORIES
Authors: MCKELLAR BRUCE H. J. , LEONARD CONRAD R. , HOLLENBERG LLOYD C. L.
Published: May 2003

We give a pedagogical account of coupled cluster methods, of Hamiltonian lattice gauge theory and of the application of coupled cluster methods to the study of Hamiltonian lattice gauge theory.
QUANTUM TUNNELLING OR THERMAL HOPPING
Authors: PANCHAPAKESAN N.
Published: May 2003

The nature of the transition from the quantum tunneling regime to the thermal hopping regime has importance in the study of condensed matter physics and cosmological phase transitions. It may also be of significance in collapse from quantum state to a classical state due to measurement (or loss of coherence due to some other process). We study this transition analytically in scalar field theory with a fourth order term. We obtain analytic bounce solutions which correctly give the action in thin and thick wall limits of the potential. We find that the transition is of the second order for the case of thick wall while it seems to be of first order for the case of thin wall.
THE STORY OF SPIN IN THE NUCLEON
Authors: RAMACHANDRAN R.
Published: May 2003

There are many different models of the nucleon, the basic building block of most of the matter in the universe. We discuss the origin of the spin in different models and look for definitive experimental signals that support the view.
NEUTRINO MASS: PEEPING BEYOND THE STANDARD MODEL
Authors: RAYCHAUDHURI AMITAVA
Published: May 2003

Evidence in support of a nonzero neutrino mass, through the phenomenon of oscillations, is steadily becoming more compelling. A pedagogic introduction to vacuum neutrino oscillations and resonant flavour conversion is presented in this paper, prefaced by a thumbnail sketch of the relevant properties of the neutrino as embodied in the Standard Model of particle physics. The recent results from solar and atmospheric neutrinos are summarised and their combined implications on neutrino properties are outlined. Some attempts to incorporate a nonzero neutrino mass in extensions of the Standard Model are briefly discussed.
SUPERSYMMETRY, R-PARITY AND THEIR BREAKING
Authors: ROY PROBIR
Published: May 2003

After a general introduction, we discuss the motivation for supersymmetry in the light of the present status of the Standard Model of particle interactions. We then outline the MSSM which is the minimal supersymmetric extension of the latter model and focus on corresponding accelerator signals. The question of R-parity violation is raised and some collider-specific [Formula: see text] phenomenology discussed. Four salient points are made in the conclusion.
CONTEXTUAL DETERMINISTIC QUANTUM MECHANICS
Authors: ROY S. M.
Published: May 2003

We present a simple proof of quantum contextuality for a spinless particle with a one-dimensional configuration space. We then discuss how the maximally realistic deterministic quantum mechanics recently constructed by this author and V. Singh can be applied to different contexts.
TWO-BRANCH ENERGY OF MAGNETIC SURFACES AND CONNECTION WITH ANHOLONOMY
Authors: BALAKRISHNAN RADHA
Published: May 2003

For general boundary conditions, we show that the energy H of a classical Heisenberg ferromagnetic spin system on a curved surface satisfies the inequality H≥|Γ|. Here Γ is a certain geometric phase or anholonomy associated with the spin vector field. This is a generalization of the well known Bogomol'nyi inequality H≥4πQ (Q=integer). For a wide variety of curved surfaces, seeking solutions with certain symmetries, we find that the variational equation δH=0 can be reduced to a sine-Gordon equation with a geometry-dependent parameter. Soliton lattice solutions of this equation are analyzed. It is shown that both H and Γ develop two branches each, all of which merge at the one-soliton limit. This branching is interpreted as a topological transition of the spin textures that occurs at the one-soliton point.
HEISENBERG SPINS ON A CYLINDER SECTION
Authors: BENOIT J. , DANDOLOFF R. , SAXENA A.
Published: May 2003

Classical Heisenberg spins in the continuum limit (i.e. the nonlinear σ-model) are studied on an elastic cylinder section with homogeneous boundary conditions. The latter may serve as a physical realization of magnetically coated microtubules and cylindrical membranes. The corresponding rigid cylinder model exhibits topological soliton configurations with geometrical frustration due to the finite length of the cylinder section. Assuming small and smooth deformations allows to find shapes of the elastic support by relaxing the rigidity constraint: an inhomogeneous Lamé equation arises. Finally, this leads to a novel geometric effect: a global shrinking of the cylinder section with swellings.
AN EXACTLY SOLVABLE MANY-BODY PROBLEM IN ONE DIMENSION
Authors: KHARE AVINASH
Published: May 2003

We obtain the exact ground state of N-particles in one dimension both on a line and on a circle in case the N particles are interacting via nearest and next-to-nearest neighbour interactions. Further, we establish a mapping between these N-body problems and short range Dyson models introduced recently to model intermediate spectral statistics. Using this mapping we compute one and two point functions of a related many-body theory in the thermodynamic limit and show the absence of long range order. Generalization of the model on the line to higher dimensions as well as to other root systems is also considered. Finally, we also consider a variant of the above model in two dimensions in which all the states exhibit novel correlations.
TRANSPORT IN LUTTINGER LIQUIDS
Authors: RAO SUMATHI
Published: May 2003

We give a brief introduction to Luttinger liquids and to the phenomena of electronic transport or conductance in quantum wires. We explain why the subject of transport in Luttinger liquids is relevant and fascinating and review some important results on tunneling through barriers in a one-dimensional quantum wire and the phenomena of persistent currents in mesoscopic rings. We give a brief description of our own work on transport through doubly-crossed Luttinger liquids and transport in the Schulz–Shastry exactly solvable Luttinger-like model.

With a view to making this article accessible to researchers in diverse fields such as nuclear physics, particle physics, formal field theory and condensed matter physics, we begin by first giving a brief introduction. In Sec. 1, we explain the words such as "Luttinger liquid" and "transport" in the title. We also motivate the study of this subject by showing that field is very important at the current time from the applications point of view and describe why it is theoretically fascinating. We then give a quick review of some of the important results in the field in Sec. 2, before we go on to describe some work that we have recently done and are doing in this field in Sec. 3. Finally, in Sec. 4, we conclude by re-emphasizing the importance of this area and drawing attention towards future possibilities.
DIFFERENTIAL CALCULUS ON INHOMOGENEOUS QUANTUM GROUPS
Authors: DIDT DANIEL
Published: May 2003

We investigate the question of covariant differential calculi on the bosonisation of a coquasitriangular Hopf algebra and an associated braided Hopf algebra. As a result we present a general way of obtaining such calculi on inhomogeneous quantum groups.
CONFORMAL SUPERFIELDS AND BPS STATES IN AdS4/7 GEOMETRIES
Authors: FERRARA SERGIO , SOKATCHEV EMERY
Published: May 2003

We carry out a general analysis of the representations of the superconformal algebras OSp(8/4, ℝ) and OSp(8*/2N) in terms of harmonic superspace. We present a construction of their highest-weight UIR's by multiplication of the different types of massless conformal superfields ("supersingletons").

Particular attention is paid to the so-called "short multiplets". Representations undergoing shortening have "protected dimension" and may correspond to BPS states in the dual supergravity theory in anti-de Sitter space.

These results are relevant for the classification of multitrace operators in boundary conformally invariant theories as well as for the classification of AdS black holes preserving different fractions of supersymmetry.