bluuebunny/crossref_metadata_2025 huggingface dataset:
AHARONOV–BOHM EFFECT FOR BOUND STATES IN KALUZA–KLEIN THEORY
Authors: FURTADO CLÁUDIO , BEZERRA V. B. , MORAES FERNANDO
Published: April 2003

Using Kaluza-Klein theory we study the quantum mechanics of a scalar particle in the background of a chiral cosmic string and of a magnetic cosmic string. We show that the wave functions and the energy spectra associated with the particle depend on the global features of those space–times. These dependences represent the analogs of the well-known Aharonov–Bohm effect. This effect appears as the sum of two contributions, one of gravitational origin and the other of electromagnetic origin.
NORMALIZATION FACTORS IN CONFORMAL FIELD THEORY AND THEIR APPLICATIONS
Authors: FATEEV V. A.
Published: April 2003

We calculate the normalization factors and reflection amplitudes in the W-invariant conformal quantum field theories. Using these CFT data we derive vacuum expectation values of exponential fields in affine Toda theories and related perturbed conformal field theories. We also calculate the asymptotics of cylindrically symmetric solutions of the classical Toda equations.
MONOPOLES AND BLACK HOLE ENTROPY
Authors: SUYAMA TAKAO
Published: April 2003

We consider the entropy of a black hole which has zero area horizon. The microstates appear as monopole solutions of the effective theory on the corresponding brane configurations. The resulting entropy formula coincides with the one expected from stringy calculation and agrees with U-duality invariance of entropy.
AUXILIARY REPRESENTATIONS OF LIE ALGEBRAS AND THE BRST CONSTRUCTIONS
Authors: BURDÍK ČESTMÍR , PASHNEV A. , TSULAIA M.
Published: April 2003

The method of constructing auxiliary representations for a given Lie algebra is discussed in the framework of the BRST approach. The corresponding BRST charge turns out to be non-hermitian. This problem is solved by the introduction of the additional kernel operator in the definition of the scalar product in the Fock space. The existence of the kernel operator is proven for any Lie algebra.
ZERO-BRANE MATRIX MECHANICS, MONOPOLES AND MEMBRANE APPROACH IN QCD
Authors: GABADADZE GREGORY , KAKUSHADZE ZURAB
Published: April 2003

We conjecture that a T-dual form of pure QCD describes dynamics of point-like monopoles. T-duality transforms the QCD Lagrangian into a matrix quantum mechanics of zero-branes which we identify with monopoles. At generic points of the monopole moduli space, the SU (N) gauge group is broken down to U (1)N-1 reproducing the key feature of 't Hooft's Abelian projection. There are certain points in the moduli space where monopole positions coincide, gauge symmetry is enhanced and gluons emerge as massless excitations. We show that there is a linearly rising potential between zero-branes. This indicates the presence of a stretched flux tube between monopoles. The lowest energy state is achieved when monopoles are sitting on top of each other and gauge symmetry is enhanced. In this case they behave as free massive particles and can be condensed. In fact, we find a constant eigenfunction of the corresponding Hamiltonian which describes condensation of monopoles. Using the monopole quantum mechanics, we argue that large-N QCD in this T-dual picture is a theory of a closed bosonic membrane propagating in five-dimensional space–time. QCD point-like monopoles can be regarded in this approach as constituents of the membrane.
QUANTUM COSMOLOGY AND WORMHOLES IN SOME SCALAR–TENSOR THEORIES
Authors: PIMENTEL L. O. , MORA CESAR
Published: April 2003

We consider quantum cosmology for some scalar–tensor theories of gravitation in the case of homogeneous and isotropic cosmological models. We present quantum solutions corresponding to cosmological term: (i) λ(ϕ) = 0 and (ii) λ(ϕ) = 3qϕ. In the first case we find a solution that can be interpreted as a quantum wormhole since it satisfies the Hawking–Page regularity conditions. Also, we obtain the WKB approximation.
MIRAGE GAUGE COUPLING UNIFICATION AND TeV SCALE STRINGS
Authors: HALYO EDI
Published: April 2003

We consider gauge coupling unification in models with TeV scale strings and large compact dimensions realized as type IIB string orientifolds. Following an observation by Ibanez we show that the gauge couplings at low energies can behave as if they effectively unify at MU~2 × 1016 GeV with αU~1/24. This requires the σ model anomaly coefficients [Formula: see text] not to be all equal and their ratio to the β-functions of minimally supersymmetric standard model βa to be a constant independent of the gauge group. If, in addition, [Formula: see text] have a gauge group independent constant piece, the relation between the unified gauge coupling and the dilaton vev is modified so that there can be weakly coupled gauge theories arising from strongly coupled strings.
RESOLUTION OF THE Be/B SOLAR NEUTRINO FLUX ANOMALY IN THE RESONANT SPIN-FLAVOR PRECESSION SCENARIO WITH TWISTING SOLAR MAGNETIC FIELDS
Authors: DEV S. , SHARMA JYOTI DHAR
Published: April 2003

The Be/B neutrino flux anomaly has been examined within the framework of the resonant spin-flavor precession scenario with twisting solar magnetic fields. It is found that the twist of the toroidal component of the solar magnetic field, leads naturally to a complete disappearance of 7 Be neutrinos emerging from one of the solar hemispheres. However, the 7 Be neutrino flux emerging from the other solar hemisphere with oppositely twisted magnetic field must survive completely. Thus, this scenario predicts seasonal variations of the 7 Be neutrino flux to be observed in the Borexino experiment.
TC2 DYNAMICS AND SINGLE TOP QUARK PRODUCTION AT HIGH ENERGY e+e- COLLIDERS
Authors: YUE CHONGXING , LI WEIBIN
Published: April 2003

We give the anomalous [Formula: see text] couplings, which come from the top-color gauge bosons, and estimate their contributions to the process [Formula: see text] in top-color-assisted technicolor (TC2) theory. Our results show that the production cross-section is of the order of 100–10-1 fb for reasonable ranges of the parameters.
NON-ABELIAN STOKES THEOREM AND QUARK CONFINEMENT IN SU(3) YANG–MILLS GAUGE THEORY
Authors: KONDO KEI-ICHI , TAIRA YUTARO
Published: April 2003

We derive a new version of SU (3) non-Abelian Stokes theorem by making use of the coherent state representation on the coset space SU (3)/ U (1) × U (1)) = F2, the flag space. Then we outline a derivation of the area law of the Wilson loop in SU (3) Yang–Mills theory in the maximal Abelian gauge (the detailed exposition will be given in a forthcoming article). This derivation is performed by combining the non-Abelian Stokes theorem with the reformulation of the Yang–Mills theory as a perturbative deformation of a topological field theory recently proposed by one of the authors. Within this framework, we show that the fundamental quark is confined even if G = SU (3) is broken by partial gauge fixing into H = U (2) just as G is broken to H = U(1) × U(1). An origin of the area law is related to the geometric phase of the Wilczek–Zee holonomy for U (2). Abelian dominance is an immediate by-product of these results and magnetic monopole plays the dominant role in this derivation.
DOUBLE SYMMETRIES IN FIELD THEORIES
Authors: SLAD L. M.
Published: April 2003

In this letter a concept of double symmetry is introduced, and its qualitative characteristics and rigorous definitions are given. We describe two ways of constructing the double-symmetric field theories and present an example demonstrating the high efficiency of one of them. Noting the existing double-symmetric theories we draw attention to a dual status of the group SU (2)L ⊗ SU (2)R as a secondary symmetry group, and in this connection we briefly discuss logically possible aspects of the P-violation in weak interactions.
SUPERGRAVITY ON AdS5/4× HOPF FIBRATIONS AND CONFORMAL FIELD THEORIES
Authors: HALYO EDI
Published: April 2003

We obtain three- and four-dimensional conformal field theories with less than maximal supersymmetry by using their supergravity duals. These supergravity theories are type II on AdS5×CP2, IIA on AdS4×CP3, IIB on AdS5×S5/Zk and D=11 supergravity on AdS4×S7/Zk. They are obtained from the spherically compactified ten- and 11-dimensional theories by either Hopf reduction or by winding the U(1) fiber over the base.
SYMMETRY REALIZATION, POISSON KERNEL AND THE AdS/CFT CORRESPONDENCE
Authors: CHANG ZHE , GUO HAN-YING
Published: April 2003

Two kinds of realizations of symmetry on classical domains or the Euclidean version of AdS space are used to study AdS/CFT correspondence. Mass of free particles is defined as an AdS group invariant, the Klein–Gordon and Dirac equations for relativistic particles in the AdS space are set up as a simple mimic in the case of Minkowskian space. The bulk-boundary propagator on the AdS space is given by the Poisson kernel. Theorems on the Poisson kernel guarantee the existence and sole of the bulk-boundary propagator. The propagator is used to calculate correlators of the theories that live on the boundary of the AdS space and show conformal invariance, which is desired by the AdS/CFT correspondence.
GRAVITATIONAL MEMORY OF NATURAL WORMHOLES
Authors: ANCHORDOQUI L. A. , TROBO M. L , VUCETICH H. , ZYSERMAN F.
Published: April 2003

A traversable wormhole solution of general scalar–tensor field equations is presented. We have shown, after a numerical analysis for the behavior of the scalar field of Brans–Dicke theory, that the solution is completely singularity-free. Furthermore, the analysis of more general scalar field dependent coupling constants indicates that the gravitational memory phenomenon may play an important role for the fate of natural wormholes.
IMPLICATIONS OF QUARK–LEPTON SYMMETRY FOR NEUTRINO MASSES AND OSCILLATIONS
Authors: GOLDMAN T. , STEPHENSON G. J. , McKELLAR B. H. J.
Published: April 2003

We identify a plausible scenario based on quark–lepton symmetry which correlates long baseline oscillations with maximal mixing to sterile neutrinos. The implication for the Sudbury Neutrino Observatory (SNO) is that the neutral current signal will be found to suffer the same suppression from the standard solar model prediction as obtains for the charged current signal. Flavor mixing among active neutrinos is expected to occur on shorter baselines with smaller mixing amplitudes.
DYNAMICAL FERMION MASSES UNDER THE INFLUENCE OF KALUZA–KLEIN FERMIONS IN EXTRA DIMENSIONS
Authors: ABE HIROYUKI , MIGUCHI HIRONORI , MUTA TAIZO
Published: April 2003

The dynamical fermion mass generation in the four-dimensional brane is discussed in a model with five-dimensional Kaluza–Klein fermions in interaction with four-dimensional fermions. It is found that the dynamical fermion masses are generated beyond the critical radius of the compactified extra dimensional space and may be made small compared with the masses of the Kaluza–Klein modes.
ELECTROWEAK SYMMETRY BREAKING DUE TO CONFINEMENT
Authors: LIU CHUN
Published: April 2003

Within the framework of gauge mediated supersymmetry breaking, we consider an electroweak symmetry breaking pattern in which there is no conventional μ term. The pattern is made appealing through realizing it as low energy effective description of a supersymmetric Yang–Mills theory which is of confinement. Phenomenological implications are discussed.
INHOMOGENEOUS MULTIDIMENSIONAL COSMOLOGIES
Authors: BERGLIAFFA SANTIAGO E. PEREZ
Published: April 2003

Einstein's equations for a (4 + n)-dimensional inhomogeneous space–time are presented, and a special family of solutions is exhibited for an arbitrary n. The solutions depend on two arbitrary functions of time. The time development of a particular member of this family is studied. This solution exhibits a singularity at t = 0 and dynamical compactification of the n dimensions. It is shown that the behavior of the system in the four-dimensional(i.e. post-compactification) phase is constrained by the way in which the compactified dimensions are stabilized. The fluid that generates this solution is analyzed by means of the energy conditions.
WILSON LOOP AND THE TREATMENT OF AXIAL GAUGE POLES
Authors: JOGLEKAR SATISH. D. , MISRA A.
Published: April 2003

We consider the question of gauge invariance of the Wilson loop in the light of a new treatment of axial gauge propagator proposed recently based on a finite field-dependent BRS (FFBRS) transformation. We remark that under the FFBRS transformation as the vacuum expectation value of a gauge-invariant observable remains unchanged, our prescription automatically satisfies the Wilson loop criterion. Furthermore, we give an argument for direct verification of the invariance of Wilson loop to O(g4) using the earlier work by Cheng and Tsai. We also note that our prescription preserves the thermal Wilson loop to O(g2).
A TWISTED CONFORMAL FIELD THEORY DESCRIPTION OF THE QUANTUM HALL EFFECT
Authors: CRISTOFANO GERARDO , MAIELLA GIUSEPPE , MAROTTA VINCENZO
Published: April 2003

We construct an effective conformal field theory by using a procedure which induces twisted boundary conditions for the fundamental scalar fields. That allows one to describe a quantum Hall fluid at Jain hierarchical filling, [Formula: see text], in terms of one charged scalar field and m - 1 neutral ones. Then the resulting algebra of the chiral primary fields is U(1)×[Formula: see text]. Finally the ground state wave functions are given as correlators of appropriate composite fields (a-electrons).
ON THE CP-SYMMETRY IN THE NEUTRINO SCATTERING BY NUCLEI
Authors: BEGZHANOV R. B. , SHARAFIDDINOV R. S.
Published: April 2003

The elastic scattering of longitudinal and transversal neutrinos on a spinless nucleus have been discussed taking into account the charge, magnetic, anapole and electric dipole moments of fermions and their weak neutral currents. Compound structure of the neutrino interaction cross-section with nuclei have been defined. Invariance of the considered process concerning the C- and P-operations have been investigated in the polarization type dependence.
A NOTE ON TOPOLOGICAL 4-D GRAVITY AND ITS METRIC APPROACH
Authors: MENAA M. , TAHIRI M.
Published: April 2003

We demonstrate that the incorporation of the anti-BRST symmetry in addition to that of the BRST in topological 4-D gravity can be used to introduce the gauge-fixing antighosts implementing the vanishing torsion and the self-duality on the curvature as topological symmetry constraints. We then establish the correspondence with the metric formulation where the topological symmetries are fixed by the Einstein equations in vacuum.
LEPTON PAIR PRODUCTION BY HIGH-ENERGY NEUTRINO IN AN EXTERNAL ELECTROMAGNETIC FIELD
Authors: KUZNETSOV A. V. , MIKHEEV N. V. , RUMYANTSEV D. A.
Published: April 2003

The process of the lepton pair production by a neutrino propagating in an external electromagnetic field is investigated in the framework of the standard model. Relatively simple exact expression for the probability as the single integral, which is suitable for a quantitative analysis, is obtained.
EXTENDING THE STANDARD MODEL: AN UPPER BOUND FOR A NEUTRINO MASS FROM THE RARE DECAY $K^+\rightarrow\pi^+\nu\bar\nu$
Authors: MACHET B.
Published: April 2003

The standard model seeming at a loss to account for the present experimental average rate for the rare decay [Formula: see text], we tackle the question with the extension of the Glashow–Salam–Weinberg model to an SU (2)L× U (1) gauge theory of J = 0 mesons proposed in Ref. 7, in which, in addition, the neutrinos are given Dirac masses from Yukawa couplings to the Higgs boson. The latter triggers a new contribution to this decay through flavor changing neutral currents that arise in the quartic term of the symmetry breaking potential; it becomes sizable for a neutrino mass in the MeV range; the experimental upper limit for the decay rate translates into an upper bound of 5.5 MeV for the mass of the neutrino, three times lower than the present direct bounds.
MANIFESTLY N = 3 SUPERSYMMETRIC EULER–HEISENBERG ACTION IN LIGHT-CONE SUPERSPACE
Authors: BÖTTNER THOMAS , KETOV SERGEI V. , LAU THOMAS
Published: April 2003

We find a manifestly N = 3 supersymmetric generalization of the four-dimensional Euler–Heisenberg (four-derivative, or F4) part of the Born–Infeld action in light-cone gauge, by using N = 3 light-cone superspace.
DYNAMICS OF STRINGS WITH GAUSSIAN DENSITY AND TENSION
Authors: KHANAL U.
Published: April 2003

The dynamics of strings with Gaussian density and tension are discussed. In vacuum-dominated region with negative pressure, the equation of motion becomes the wave equation in disperso-conductive medium, with linear dependence of conductivity on time and of dispersivity on space. On the other hand, in matter-dominated regions with positive pressure the EOM is elliptic in type. The EOM is solved for the vibrating string. The appropriate Green's functions for typical boundary conditions are also derived.
MAGNETIC MOMENT μ OF Ω--BARYON USING RICHARDSON POTENTIAL IN A RELATIVISTIC HARTREE–FOCK (RHF) METHOD
Authors: RAY KANAD , DEY JISHNU , DEY MIRA
Published: April 2003

A RHF method is used to calculate magnetic moment μ of Ω- using the Richardson potential. Unlike the mass of baryon, μ is very sensitive to the detailed structure of the model since it depends on the wave function. Given any quark–quark (qq) potential we have the RHF wave function for the ground state. We have developed a code for expanding this Dirac wave function in terms of two sets of oscillators. To fit both the mass and magnetic moment simultaneously we find that it is essential to separate out the confining part from the asymptotically free part of the potential and use different parameters for each part. The best fitted results from our model are in good agreement with experiment.
STUDY OF BFKL GLUON DYNAMICS IN HEAVY QUARKONIUM PHOTOPRODUCTION AT HERA
Authors: LIPATOV A. V. , ZOTOV N. P.
Published: April 2003

In the framework of semihard QCD approach we consider the processes of inelastic heavy quarkonium photoproduction at HERA with emphasis on the BFKL dynamics of gluon distributions. We investigate the dependences of the total cross-section of inelastic J/Ψ photoproduction and also pT and z spectra on different forms of the unintegrated gluon distribution. It is shown that the total cross-section is most sensitive to the Pomeron intercept parameter Δ. We compare the theoretical results with the available H1 and ZEUS experimental data.
EFFECTIVE COUPLINGS OF DYNAMICAL NAMBU–GOLDSTONE BOSONS WITH ELEMENTARY FERMIONS
Authors: MATSUKI TAKAYUKI , SHIOTANI MASASHI
Published: April 2003

Assuming dynamical spontaneous breakdown of chiral symmetry for massless gauge theory without scalar fields, we find a method to construct an effective action of the dynamical Nambu–Goldstone bosons and elementary fermions by using auxiliary fields. Here dynamical particles are assumed to be composed of elementary fermions. Various quantities including decay constants are calculated from this effective action.
STUDY ON HADRONIC DECAY OF THE LOWEST LYING GLUEBALLS WITH JPC=even++ TO TWO PSEUDOSCALAR MESONS
Authors: LI DE-MIN , YU HONG , SHEN QI-XING
Published: April 2003

Taking into account the possible glueball component in the final state mesons, we investigate the hadronic decay modes of the lowest lying glueballs (G) with J PC = even ++ to two pseudoscalar mesons (PP). The naive estimations of [Formula: see text] for scalar and tensor glueballs are given.
GRAVITATING (BI-)SPHALERONS
Authors: BRIHAYE Y. , DESOIL M.
Published: April 2003

The standard model of electroweak interactions is minimally coupled to gravity and the response of the spherically symmetric solutions — the sphaleron and the bisphaleron — to gravity is emphasized. For a given value of the Higgs mass M H, several branches of solutions exist which terminate into cusp-catastrophy at some ( M H-depending) critical value of the parameter α defined by the ratio of the vector–boson mass to the Planck mass. A given branch either bifurcates from another at an intermediate value of α or persists in the limit α→0 where it terminates into a flat sphaleron or bisphaleron or into a Bartnik–McKinnon solution. These bifurcation patterns are studied in some details.
DUALITY IN EQUATIONS OF MOTION FROM SPACE–TIME DEPENDENT LAGRANGIANS
Authors: BHATTACHARYYA RAJSEKHAR , GANGOPADHYAY DEBASHIS
Published: April 2003

Starting from Lagrangian field theory and the variational principle, we show that duality in equations of motion can also be obtained by introducing explicit space–time dependence of the Lagrangian. Poincaré invariance is achieved precisely when the duality conditions are satisfied in a particular way. The same analysis and criteria are valid for both Abelian and non-Abelian dualities. We illustrate how (a) Dirac string solution, (b) Dirac quantization condition, (c) 't Hooft–Polyakov monopole solutions and (d) a procedure emerges for obtaining new classical solutions of Yang–Mills (YM) theory. Moreover, these results occur in a way that is strongly reminiscent of the holographic principle.
BFT HAMILTONIAN EMBEDDING FOR SU(3) SKYRMION
Authors: HONG SOON-TAE , PARK YOUNG-JAI
Published: April 2003

We apply the Batalin, Fradkin and Tyutin (BFT) formalism to the SU (3) flavor Skyrmion model to investigate the Weyl ordering correction to the structure of the hyperfine splittings of strange baryons. On the other hand, the Berry phases and Casimir effects are also discussed.
EXACT ${\mathcal O}(g^2\alpha_s)$ TOP DECAY WIDTH FROM GENERAL MASSIVE TWO-LOOP INTEGRALS
Authors: GHINCULOV ADRIAN , YAO YORK-PENG
Published: April 2003

We calculate the b-dependent self-energy of the top-quark at [Formula: see text] by using a general massive two-loop algorithm proposed in a previous article. From this we derive by unitarity the [Formula: see text] radiative corrections to the decay width of the top quark, where all effects associated with the b-quark mass are included without resorting to a mass expansion. Our results agree with the analytical results available for the [Formula: see text] correction to the top-quark width.
LOGARITHMIC OPERATORS IN THE THEORY OF PLATEAU TRANSITION
Authors: KOGAN IAN I. , TSVELIK ALEXEI M.
Published: April 2003

We show that SL (2; C)/ SU (2) model which had been recently proposed to describe the behavior of the local densities of states at the plateau transition in integer quantum Hall effect, has logarithmic operators. Their unusual properties are studied in this letter.
THE BEHAVIOR OF ROTATING BODIES THAT EMIT GRAVITATIONAL WAVES IN GENERAL RELATIVITY
Authors: COOPERSTOCK F. I.
Published: April 2003

Recently we demonstrated that Eddington's spinning rod lost "kinetic" energy but preserved its total energy while emitting gravitational waves. Additional information is now determined by analyzing the angular momentum of the rod. We develop an expression for the angular momentum loss of the material system alone with an integration over the source region. As expected, it is found that the moment of inertia of the rod increases as the rotation rate diminishes in analogy with typical classical systems. Its rate of change is determined in relation to the angular deceleration of the body.
FINE-TUNING THE LOW-ENERGY PHYSICS
Authors: XUE SHE-SHENG
Published: April 2003

In this letter we discuss the problem of the extreme fine-tuning necessary to achieve the quark mass scale mt within the dynamical symmetry breaking of the phenomenological [Formula: see text] condensate model. Inspired by the vector-like phenomenon of chiral gauge theories at short distances, we postulate that the W±-gauge bosons possess a vector-like gauge coupling and contribute to the gap-equations of quark self-energy functions in the high-energy region. We find that the gap-equations of different charge sectors are coupled, and as a result the unnatural fine-tuning is overcome and the ratio of the top and bottom masses is related to the electric charge: [Formula: see text], provided the quadratic divergence is removed by setting the four-fermion coupling [Formula: see text].
BERRY CONNECTIONS AND INDUCED GAUGE FIELDS IN QUANTUM MECHANICS ON SPHERE
Authors: IKEMORI HITOSHI , KITAKADO SHINSAKU , OTSU HIDEHARU , SATO TOSHIRO
Published: April 2003

Quantum mechanics on sphere Sn is studied from the viewpoint that the Berry's connection has to appear as a topological term in the effective action. Furthermore we show that this term is the Chern–Simons term of gauge variables that correspond to the extra degrees of freedom of the enlarged space.
CHERN–SIMONS GRAVITY, WILSON LINES AND LARGE-N DUAL GAUGE THEORIES
Authors: PANIAK L. D.
Published: April 2003

A five-dimensional Chern–Simons gravity theory based on the anti-de Sitter group SO (4, 2) is argued to be a useful model in which to understand the details of holography and the relationship between generally covariant and dual local quantum field theories. Defined on a manifold with boundary, conformal geometry arises naturally as a gauge invariance preserving boundary condition. By matching thermodynamic quantities for a particular background geometry, the dimensionless coupling constant of the Chern–Simons theory is directly related to the number of fields in a putative dual theory at high temperature. As a consistency check, the semiclassical factorization of Wilson line observables in the gravity theory is shown to induce a factorization in dual theory observables as expected by general arguments of large-N gauge theory.
NON-ABELIAN STOKES THEOREM AND COMPUTATION OF WILSON LOOP
Authors: CHEN YING , HE BING , WU JI-MIN
Published: April 2003

It is shown that the application of the non-Abelian Stokes theorem to the computation of the operators constructed with Wilson loop will lead to ambiguity if the gauge field under consideration is nontrivial. This point is illustrated by the specific examples of the computation of a nonlocal operator.
A GENERALIZED p-FORM MODEL IN D = 3
Authors: PISAR T. , RANT J. , ZERROUKI H.
Published: April 2003

A topological model in three dimensions is proposed. It combines the Chern–Simons action with a BFK-model which was investigated recently by the authors of Ref. 1. The finiteness of the model to all orders of perturbation theory is shown in the framework of algebraic renormalization procedure.
NON-ABELIAN FLAT DIRECTIONS IN A MINIMAL SUPERSTRING STANDARD MODEL
Authors: CLEAVER G. B. , NANOPOULOS D. V. , WALKER J. W. , FARAGGI A. E.
Published: April 2003

Recently, by studying exact flat directions of non-Abelian singlet fields, we demonstrated the existence of free fermionic heterotic-string models in which the SU (3)C× SU (2)L×U(1)Y-charged matter spectrum reduces to that of the MSSM in the effective field theory. In this letter we generalize the analysis to include vevs of non-Abelian fields. We find MSSM-producing, exact non-Abelian flat directions, which are the first such examples in the literature. We examine the possibility that hidden sector condensates lift the flat directions.
MODIFICATION OF KAWAI MODEL ABOUT THE MIXING OF THE PSEUDOSCALAR MESONS
Authors: LI DE-MIN , YU HONG , SHEN QI-XING
Published: April 2003

The Kawai model describing the glueball–quarkonia mixing is modified. The mixing of η, η′ and η(1410) is re-investigated based on the modified Kawai model. The glueball–quarkonia content of the three states is determined from a fit to the data of the electromagnetic decays involving η, η′. Some predictions about the electromagnetic decays involving η(1410) are presented.
HEAT CONTENT ASYMPTOTICS OF AN INHOMOGENEOUS TIME-DEPENDENT PROCESSES
Authors: GILKEY PETER , PARK JEONG HYEONG
Published: April 2003

Let M be a compact manifold with smooth boundary. We study the heat content asymptotics on M which are defined by a time-dependent metric gt, by a time-dependent heat source, by time-dependent boundary conditions, and by a time-dependent specific heat.
THERMAL RENORMALONS IN SCALAR FIELD THEORY
Authors: LOEWE M. , VALENZUELA C.
Published: April 2003

In the framework of the scalar theory gϕ4, we explore the occurrence of thermal renormalons, i.e. temperature-dependent singularities in the Borel plane. The discussion of a particular renormalon type diagram at finite temperature, using Thermofield Dynamics, allows us to establish that these singularities actually get a temperature dependence. This dependence appears in the residues of the poles, the positions of the poles remain unchanged with temperature.
SCALING PROPERTY IN COLD COMPACT STARS
Authors: SHARMA R. , MUKHERJEE S. , MAHARAJ S. D.
Published: April 2003

We point out a simple scaling property in the mass–radius relationship in cold compact stars. This property my be considered as a generalization of the scaling observed by Witten for strange quark stars. A particular model which explicitly exhibits this scaling behavior has been discussed. The model is relevant for neutron stars as well as stars made up of exotic matter, in particular, quark stars and other composites based on Bag model calculations.
ON THE COSMOLOGICAL IMPLICATIONS OF THE CALOGERO CONJECTURE
Authors: GAETA GIUSEPPE
Published: April 2003

We discuss the implications of the Calogero hypothesis on the "cosmic origin of quantization",1 and of the variation of h with time it implies, for cosmology. We focus on two issues: (a) how the relation between redshift and distance would be modified; and (b) how the observations on the cosmic background radiation, and the estimation they give of the time elapsed since its production, would be interpreted in the light of Calogero hypothesis. We also check that the hypothesis is compatible with the present bounds on the variations of fundamental constants and with the observed black body distribution of the cosmic background radiation.
DENSITY DEPENDENT STRONG COUPLING CONSTANT OF QCD DERIVED FROM COMPACT STAR DATA
Authors: RAY SUBHARTHI , DEY JISHNU , DEY MIRA
Published: April 2003

Since 1996 there is major influx of X-ray and γ-ray data from binary stars, one or both of which are compact objects that are difficult to explain as neutron stars since they contain a mass M in too small a radius R. The suggestion has been put forward that these are strange quark stars (SS) explainable in a simple model with chiral symmetry restoration (CSR) for the quarks and the M, R and other properties like QPOs (quasi-periodic oscillations) in their X-ray power spectrum.

It would be nice if this astrophysical data could shed some light on fundamental properties of quarks obeying QCD. One can relate the strong coupling constant of QCD, αs to the quark mass through the Dyson–Schwinger gap equation using the real time formalism of Dolan and Jackiw. This enables us to obtain the density dependence of αs from the simple CSR referred to above. This way fundamental physics, difficult to extract from other models like for example lattice QCD, can be constrained from present-day compact star data and may be put back to modeling the dense quark phase of early universe.
A SKYRME PARAMETRIZATION BASED ON NUCLEAR MATTER BHF CALCULATIONS
Authors: RASHDAN M.
Published: April 2003

Using a modified energy density functional of nuclear matter derived by solving the Bethe–Goldstone equation with a realistic nucleon–nucleon interaction and by including corrections due to relativistic and three-body effects, an effective Skyrme parameter set is derived. These corrections are found to be important in order to well describe the saturation properties of nuclear matter. The obtained Skyrme parameter set, which we denoted by SKRA, is found to better account for nuclear correlations and satisfactory describes finite nuclei, when used in the Skyrme–Hartree–Fock theory. The SKRA interaction can also be considered as an important step toward removing the ambiguities in the determination of Skyrme parameters.
AN ALTERNATIVE CONSTRUCTION OF THE QUANTUM ACTION FOR SUPERGRAVITY
Authors: DJEGHLOUL N. , TAHIRI M.
Published: April 2003

We develop a method to derive the on-shell invariant quantum action of the simple supergravity in such a way that the quartic ghost interactions term is explicity determined. First, we reinvestigate the simple supergravity in terms of a principal superfiber bundle. This gives rise to the closed geometrical BRST algebra. Therefore we determine the open BRST algebra, which realizes the invariance of the classical action. Then, given a prescription to build the full quantum action, we obtain the quantum BRST algebra. Together with the constructed quantum action this allows us to recover the auxiliary fields and the invariant extension of the classical action.
AVERAGED WEAK ENERGY CONDITION VIOLATION FOR WORMHOLE GEOMETRIES WITH TORSION
Authors: GARCIA DE ANDRADE L. C.
Published: April 2003

The averaged weak energy condition (AWEC) is examined in the light of wormhole geometries with torsion. An example of ultraelectrostatic wormhole with torsion and spinning particles as an exact solutions of Einstein–Cartan (EC) field equations of gravity is given. An upper bound for the spin energy density allowed inside the wormhole in space–times with torsion is obtained.
ROTATABLE-TORSION-BALANCE EQUIVALENCE PRINCIPLE EXPERIMENT FOR THE SPIN-POLARIZED HoFe3
Authors: HOU LI-SHING , NI WEI-TOU
Published: April 2003

We use a rotatable torsion balance to perform an equivalence principle test on a magnetically shielded spin-polarized body of HoFe 3. With a rotation period of one hour, the period of possible signal is reduced from one solar day by 24 times, and hence the 1/f noise is greatly reduced. Our present experimental results give a limit of (-0.68 ± 0.90) × 10-9 on the Eötvös parameter [Formula: see text] and a limit of (1.8 ± 5.3) × 10-9 on the Eötvös parameter [Formula: see text] of equivalence of the polarized body compared with unpolarized aluminum–brass cylinders in the solar gravitational field, and a limit (-0.24 ± 0.55) × 10-9 on the Eötvös parameter [Formula: see text] in the earth gravitational field. This improves the previous limit on the Eötvös parameter [Formula: see text] for polarized electrons in the solar gravitational field by one order of magnitude.
QUARKS AND NEUTRON HALO NUCLEI, NUCLEAR CLUSTERS AND NUCLEAR MOLECULES
Authors: ABBAS AFSAR
Published: April 2003

It is shown that the hole in the centre of 3 H , 3 He and 4 He , the neutron halos in nuclei, the α- and other clustering effects in nuclei and the nuclear molecules all basically arise due to the same underlying effect. We shall show that all these ground state properties of nuclei are manifestations of quark effects. The role of triton clustering in very neutron rich nuclei is emphasized. All these require the concept of hidden colour states which arise from confinement ideas of QCD for the multi-quark systems. This provides a comprehensive understanding of diverse nuclear effects and makes unique predictions.
GRAVITATIONAL EFFECTS OF ROTATING BODIES
Authors: ZHANG YUAN-ZHONG , LUO JUN , NIE YU-XIN
Published: April 2003

We study two types of effects of gravitational field on mechanical gyroscopes (i.e. rotating extended bodies). The first depends on special relativity and equivalence principle. The second is related to the coupling (i.e. a new force) between the spins of mechanical gyroscopes, which would violate the equivalent principle. In order to give a theoretical prediction to the second we suggest a spin–spin coupling model for two mechanical gyroscopes. An upper limit on the coupling strength is then determined by using the observed perihelion precession of the planet's orbits in solar system. We also give predictions violating the equivalence principle for free-fall gyroscopes.
THE RADIATIVE LEPTONIC $B_c\to \tau \bar \nu_\tau\gamma$ DECAY IN TWO-HIGGS DOUBLET MODEL
Authors: BARAKAT T.
Published: April 2003

The radiative leptonic [Formula: see text] decay is analysed in context of 2HDM. It is shown that with large values of tan β, the contributions of Model II to the decay rate exceeds considerably the Standard Model ones, while the contributions of Model I overlap with the Standard Model predictions.
ON THE ROLE OF WIGNER'S LITTLE GROUP AS A GENERATOR OF GAUGE TRANSFORMATION IN MAXWELL–CHERN–SIMONS THEORY
Authors: BANERJEE RABIN , CHAKRABORTY BISWAJIT , SCARIA TOMY
Published: April 2003

The role of Wigner's little group in 2 + 1 dimensions as a generator of gauge transformation in the topologically massive Maxwell–Chern–Simons (MCS) theory is discussed. The similarities and dissimilarities between the Maxwell and MCS theories in the context of gauge fixing (spatial transversality and temporal gauge) are also analyzed.
A DYNAMICAL SOLUTION OF STABLE STAROBINSKY-TYPE INFLATIONARY MODEL IN QUANTUM GEOMETRY
Authors: HAMADA KEN-JI
Published: April 2003

Quantum geometry gives a regularization scheme-independent effective action, whose equation of motion for the conformal mode has a stable de Sitter solution at the high-energy region where the coupling of the self-interactions of the traceless mode can be neglected because of the asymptotic freedom. However, the dynamics of the traceless mode suggests that inflation ends at the low-energy region. The notable point is that this inflationary senario is determined only by the dynamics of quantum geometry without an artificial tuning in the previous work.
LARGE CONTRIBUTIONS TO THE ANOMALOUS MAGNETIC MOMENT OF THE MUON IN SUPERSYMMETRIC THEORIES
Authors: FRANK M.
Published: April 2003

We show that, in supersymmetric theories beyond the Minimal Supersymmetric Standard Model, the anomalous magnetic moment of the muon can receive large contributions at one-loop level, of [Formula: see text], rather than [Formula: see text]. We evaluate all such contributions and show that, for low supersymmetric masses, they already exceed the value measured by the Brookhaven E821 experiment. These contributions put more stringent mass constraints on the parameters of the model and can distinguish it from the same process in the MSSM.
HADRONIC INTERACTIONS, PRECOCIOUS UNIFICATION, AND COSMIC RAY SHOWERS AT AUGER ENERGIES
Authors: ANCHORDOQUI LUIS , GOLDBERG HAIM , MacLEOD JARED , McCAULEY TOM , PAUL TOM , REUCROFT STEVE , SWAIN JOHN
Published: April 2003

At Auger energies only model predictions enable us to extract primary cosmic ray features. The simulation of the shower evolution depends sensitively on the first few interactions, necessarily related to the quality of our understanding of high energy hadronic collisions. Distortions of the standard "soft semi-hard" scenario include novel large compact dimensions and a string or quantum gravity scale not far above the electroweak scale. Naïvely, the additional degrees of freedom yield unification of all forces in the TeV range. In this letter we study the influence of such precocious unification during atmospheric cascade developments by analyzing the most relevant observables in-proton induced showers.
WHAT HEAVY QUANTA BOUNDS COULD BE INFERRED FROM A HIGGS DISCOVERY?
Authors: DIAZ-CRUZ J. LORENZO
Published: April 2003

The Higgs-gauge bosons couplings ghVV(V = g, γ, W, Z) receive non-decoupling corrections due to heavy quanta, and deviations from the SM predictions can be used to test its presence. The possible Higgs signal recently reported at LEP, with mh = 115 GeV , severely constrains the presence of heavy quanta, such as a heavy fourth family. At Tevatron, the Higgs production by gluon fusion, followed by the decay h → WW*, can also be used to probe the existence of heavy colored particles, including additional standard or mirror families, chiral colored sextets and octet quarks. Within the MSSM, we also find that gluon fusion is a sensitive probe for the spectrum of squark masses.
ON THE COHOMOLOGICAL STRUCTURE OF SUPERSYMMETRIC LAGRANGIANS WITH AND WITHOUT AUXILIARY FIELDS
Authors: ÜLKER K.
Published: April 2003

The origin of non-renormalization theorems in field theories with global supersymmetry can be traced to the fact that supersymmetric actions can be viewed as the highest components of respective supermultiplets. Supersymmetric interactions in particular can therefore be represented as supersymmetry variations of lower-dimensional field polynomials. We investigate here this algebraic structure in the context of the Wess–Zumino model and N = 1 and N = 2 supersymmetric Yang–Mills theories.
ANOMALOUS U(1)A AND ELECTROWEAK SYMMETRY BREAKING
Authors: GOGOLADZE ILIA , TSULAIA MIRIAN
Published: April 2003

We suggest a new mechanism for electroweak symmetry breaking in the supersymmetric Standard Model. Our suggestion is based on the presence of an anomalous U (1)A gauge symmetry, which naturally arises in the four-dimensional superstring theory, and heavily relies on the value of the corresponding Fayet–Illiopoulos ξ-term.
PRELOGARITHMIC OPERATORS AND JORDAN BLOCKS IN SL(2)k AFFINE ALGEBRA
Authors: GIRIBET GASTÓN
Published: April 2003

The free field description of logarithmic and prelogarithmic operators in noncompact Wess–Zumino–Witten model is analyzed. We study the Jordan blocks structure of the [Formula: see text] affine algebra and the role of the puncture operator in the theory in relation with the unitarity bound.
SUPERSYMMETRY IN QUANTUM MECHANICS OF COLORED PARTICLES
Authors: MAMEDOV SH. , ZHANG JIAN-ZU , ZHUKOVSKII V.
Published: April 2003

The role of supercharge operators is studied in the case of a Dirac particle moving in a constant chromomagnetic field. The Hamiltonian is factorized and the ground state wave function in the case of unbroken supersymmetry is determined.
MULTI-HAMILTON–JACOBI QUANTIZATION OF O(3) NONLINEAR SIGMA MODEL
Authors: BALEANU DUMITRU , GÜLER YURDAHAN
Published: April 2003

The O(3) nonlinear sigma model is investigated using multi-Hamilton–Jacobi formalism. The integrability conditions are investigated and the results are in agreement with those obtained by Dirac's method. By choosing an adequate extension of phase space we describe the transformed system by a set of three Hamilton–Jacobi equations and calculate the corresponding action.
NEW HADRONS FORMED BY THE FOURTH SM FAMILY AND ISO-SINGLET QUARKS
Authors: CİFTCİ HAKAN , SULTANSOY SALEH
Published: April 2003

The properties of new heavy mesons containing new heavy quarks have been investigated. As an example, the fourth SM family quarks and weak iso-singlet quarks predicted by E6GUT are considered. Production of these hadrons at TeV energy lepton colliders due to resonant formation of corresponding quarkonia have been analyzed.
CONFORMAL COUPLING AND FOLDY–WOUTHUYSEN TRANSFORMATION
Authors: ACCIOLY ANTONIO , BLAS HAROLD
Published: April 2003

The propagation of a free scalar field ϕ with mass m in a curved background is generally described by the equation (gμν∇μ∇ν + m2 + ξR)ϕ = 0. There exist some arguments in the literature that seem to favor the conformal coupling to the detriment of the minimal one. However, the majority of these claims are inconclusive. Here we show that the exact Foldy–Wouthuysen transformation for spin-0 particle coupled to a wide class of static spacetime metrics exists independently of the value of ξ. Nevertheless, if the coupling is of the conformal type, the gravitational Darwin-like term has an uncomplicated structure and it is proportional to the corresponding term in the fermionic case. In addition, an independent computation of this term, which has its origin in the zitterbewegung fluctuation of the boson's position with the mean square <(δr)2> ≈ 1/m2, gives a result that coincides with that obtained using the aforementioned exact transformation with ξ = 1/6.
IMPROVED SUSY INSPIRED VARIATIONAL METHOD TO OBTAIN BOUND STATE ENERGIES OF THE SCREENED COULOMB POTENTIAL
Authors: BOSE SUBIR K. , SCHULZE-HALBERG AXEL
Published: April 2003

We improve a result obtained in Ref. 2: In the context of supersymmetric quantum mechanics we present a certain superpotential that yields a trial function we use for the calculation of variational quantum bound state energies of the screened Coulomb potential. We show that for small screening parameters our trial function yields better approximations for the energies than the trial function used in Ref. 2.
ROLE OF QUARK INTERACTIONS WITH INSTANTON LIQUID IN COLOUR SUPERCONDUCTIVITY PHASE
Authors: MOLODTSOV S. V. , ZINOVJEV G. M.
Published: April 2003

The interaction of light quarks and instanton liquid is analyzed at finite density of quark/baryon matter and in the phase of nonzero values of diquark (colour) condensate. It is shown that instanton liquid perturbation produced by such an interaction results in an essential increase of the critical value of quark chemical potential μc which provokes the perceptible increase of quark matter density around the expected onset of the colour superconductivity phase.
ADDITIONAL CONSIDERATIONS IN THE DEFINITION AND RENORMALIZATION OF NON-COVARIANT GAUGES
Authors: JOGLEKAR SATISH D.
Published: April 2003

In this work, we pursue further consequences of a general formalism for non-covariant gauges developed in an earlier work (hep-th/0205042). We carry out further analysis of the additional restrictions on renormalizations noted in that work. We use the example of the axial gauge A3 = 0. We find that if multiplicative renormalization together with ghost-decoupling is to hold, the "prescription-term" (that defines a prescription) cannot be chosen arbitrarily but has to satisfy certain nontrivial conditions (over and above those implied by the validity of power counting) arising from the WT identitites associated with the residual gauge invariance. We also give a restricted class of solutions to these conditions.
MASS AND MIXING OF FERMIONS FROM A ROTATING MASS MATRIX
Authors: TSOU SHEUNG TSUN , PALMER JONATHAN S.
Published: April 2003

We summarize the results showing that all existing data on mixing between up and down fermion states (i.e. CKM matrix and neutrino oscillations) and on the hierarchical quark and lepton mass ratios between generations are consistent with the two phenomena being both consequences of a mass matrix rotating in generation space with changing energy scale. Thus the rotation of the mass matrix can be traced over some 14 orders of magnitude in energy from the mass scale of the t-quark at 175 GeV to below that of the atmospheric neutrino at 0.05 eV.
COUPLED QUINTESSENCE AND THE COINCIDENCE PROBLEM
Authors: MANGANO G. , MIELE G. , PETTORINO V.
Published: April 2003

We consider a model of interacting cosmological constant/quintessence, where dark matter and dark energy behave as, respectively, two coexisting phases of a fluid, a thermally excited Bose component and a condensate, respectively. In a simple phenomenological model for the dark components interaction we find that their energy density evolution is strongly coupled during the universe evolution. This feature provides a possible way out for the coincidence problem affecting many quintessence models.
A SELF-CONSISTENT ANALYTIC THEORY OF THE SPIN BIPOLARON IN THE t–J MODEL
Authors: BARENTZEN HEINZ , OUDOVENKO VIKTOR
Published: April 2003

The spin bipolaron in the t–J model, i.e., two holes interacting with an antiferromagnetic spin background, is treated by an extension of the self-consistent Born approximation (SCBA), which has proved to be very accurate in the single-hole (spin polaron) problem. One of the main ingredients of our approach is the exact form of the bipolaron eigenstates in terms of a complete set of two-hole basis vectors. This enables us to eliminate the hole operators and to obtain the eigenvalue problem solely in terms of the boson (magnon) operators. The eigenvalue equation is then solved by a procedure similar to Reiter's construction of the single-polaron wave function in the SCBA. As in the latter case, the eigenvalue problem comprises a hierarchy of infinitely many coupled equations. These are brought into a soluble form by means of the SCBA and an additional decoupling approximation, whereupon the eigenvalue problem reduces to a linear integral equation involving the bipolaron self-energy. The numerical solutions of the integral equation are in quantitative agreement with the results of previous numerical studies of the problem. The d-wave bound state is found to have the lowest energy with a critical value J/t| c ≈ 0.4. In contrast to recent claims, we find no indication for a crossover between the d-wave and p-wave bound states.