bluuebunny/crossref_metadata_2025 huggingface dataset:
GROUP THEORETICAL APPROACH TO THE FLUCTUATION EQUATIONS OF BOUNCES
Authors: CASAHORRAN JAVIER , NAM SOONKEON
Published: November 2004

Based on Schrödinger equations with SU(2) group theoretic potentials, we present a family of nonlinear models in (1+1) with non-topological bounce solutions. This is achieved by generalizing the method of obtaining nonlinear models from the stability equations of kinks, this time with a single negative eigenvalue.
THE ASYMPTOTICALLY FREE AND ASYMPTOTICALLY CONFORMALLY INVARIANT GRAND UNIFICATION THEORIES IN CURVED SPACE-TIME
Authors: BUCHBINDER I.L. , SHAPIRO I.L. , YAGUNOV E.G.
Published: November 2004

GUT’s in curved space-time is considered. The set of asymptotically free and asymptotically conformally invariant models based on the SU (N) gauge group is constructed. The general solutions of renormalization group equations are considered as the special ones. Several SU (2N) models, which are finite in flat space-time (on the one-loop level) and asymptotically conformally invariant in external gravitational field are also presented.
FLUCTUATIONS OF FLUCTUATIONS AND SPIKY SPIKES
Authors: DREMIN I. M. , LASAEVA P. E. , LOKTIONOV A. A. , NAZIROV M. T. , SHABALINA E. K. , TIKHONOVA L. A. , ZOTKIN S. A.
Published: November 2004

It is shown that the factorial moments widely used as a measure of fluctuations strongly fluctuate themselves from event to event and their distribution is a very non-monotonous discrete function. If the fluctuations (spikes) are chosen as dense isolated homogeneous groups of particles on the pseudorapidity scale, the distribution of their centers reveals two peaks at cms angles of about 75° and 105° for pp interactions at 205 and 360 GeV. These two features should be taken into account when conclusions about intermittent behavior are made.
A NOTE ON DISCRETE SYMMETRIES IN TOROIDAL COMPACTIFICATIONS OF STRINGS
Authors: OSORIO M. A. R.
Published: November 2004

In this paper we look for discrete invariances of the partition function in toroidal compactifications of strings. We show that besides world-sheet modular invariance, the partition function is invariant under GL (2d, ℤ) transformations ( GL (2d + 16, ℤ) when Wilson lines are present) acting upon the instanton contribution.
QUASI-EXACTLY SOLVABLE PROBELMS OF QUANTUM MECHANICS AND sl(2)-SYMMETRIC GAUDIN MODEL
Authors: MAGLAPERIDZE T. I. , USHVERIDZE A. G.
Published: November 2004

We propose a new approach to the problem of quasi-exact solubility in quantum mechanics. We show that the quasi-exactly solvable Schrödinger equations (allowing exact solutions only for limited parts of the spectrum) can be obtained from the completely integrable Gaudin equation by means of partial separation of variables.
LIE-ALGEBRAIC APPROACH TO THE PROBLEM OF QUASI-EXACT SOLUBILITY IN QUANTUM MECHANICS
Authors: USHVERIDZE A. G.
Published: November 2004

A new method of constructing quasi-exactly solvable models of quantum mechanics is proposed. This method is based on the use of infinite-dimensional representations of simple and semi-simple Lie algebras.
COMMENTS ON HIERARCHICAL SYMMETRY BREAKING IN EFFECTTVE THEORY OF CALABI-YAU COMPACTIFIED SUPERSTRING
Authors: SUEMATSU DAIJIRO
Published: November 2004

We re-examine the possibility of large hierarchical symmetry breaking in the effective field theory of Calabi-Yau compactified superstring. We introduce the general superpotential containing the allowed moduli couplings. In certain manifolds one-loop radiative correction gives the non-trivial minimum and that solution suggests the possibility of large hierarchical symmetry breaking. To realize such a large hierarchy, it seems to require that 27(h2,1 + h1,1) > 48π2 and H1 ( End T) chiral superfields should have certain types of couplings to moduli fields.
INSTANTON-INDUCED CROSS-SECTION AT HIGH ENERGIES: LEADING ORDER AND BEYOND
Authors: YU. KHLEBNIKOV S. , RUBAKOV V. A. , TINYAKOV P. G.
Published: November 2004

We study the total cross-section of high energy collisions in the one-instanton sector of purely bosonic theories with instantons. We find that in the limit g2 → 0, E/E sph = fixed , the leading behavior of the total cross-section is σ lot ~ exp [1/g2(−2S0 + F(E/E sph ))], where S0 is the instanton action. In the electroweak theory at E/E sph ≪ 1, the function F(E/E sph ) is determined by the gauge boson part of the instanton configuration and its explicit form is found.
GRASSMANNIAN COSET MODELS AND UNITARY REPRESENTATIONS OF W∞
Authors: BAKAS IOANNIS , KIRITSIS ELIAS
Published: November 2004

It is shown that the 2 – d coset models SU (p + 1)N/ SU (p)N ⊗ U (1) provide unitary representations of the chiral operator algebra W∞ in the large level (N → ∞) limit, with central charge c = 2p. For p ≥ 2, the corresponding field theories possess additional symmetries which given rise to a U (p) matrix generalization of W∞, denoted by [Formula: see text]. Its commutation relations are obtained in closed form for all values of p and W∞ is identified with the U(1) trace part of [Formula: see text]. It is also shown that [Formula: see text] at large p is associated with the algebra of symplectic diffeomorphisms in four dimensions.
TESTING THE BETHE ANSATZ FOR STRAIGHT STRINGS IN (2 + 1) DIMENSIONS
Authors: ORLAND PETER
Published: November 2004

The general quantum theory of nonrelativistic, infinitely long straight strings of one flavor interacting via a three-body infinitesimal range potential is considered in (2 + 1) dimensions. It is proved that the tetrahedron equation of Zamolodchikov is satisfied only when the potential is either zero or infinitely repulsive. Therefore the Bethe ansatz is valid only for these special cases.
CP VIOLATION IN η → μ+μ−
Authors: HE XIAO-GANG , McKELLAR BRUCE H. J. , PALLAGHY PAUL K.
Published: November 2004

We investigate a CP violating observable, the μ-polarization, in η → μ+μ− in several models with the standard gauge group. The CP violating parameters are constrained by the experimental upper bound on the neutron electric dipole moment. Among the models considered here, it was found that those with leptoquark scalars dominate the contributions to μ-polarization in η → μ+μ−. μ-polarization can be of order 10−3.
CORRELATIONS BETWEEN ε′/ε AND HEAVY TOP
Authors: PASCHOS EMMANUEL A. , WU Y.L.
Published: November 2004

The paper reviews new theoretical developments for the CP-parameter ε′/ε and its intimate connection with the mass of a heavy top quark. It presents an extensive list of results and their implications for experiments.
GENERAL FORM OF THE LATTICE FERMION ACTION
Authors: ZENKIN S.V.
Published: November 2004

A set of lattice fermion actions is found which are consistent with canonical quantization of fermion systems. A new type of non-local chirally invariant action determined by the Weyl quantization is found to be inconsistent with gauge invariance. This completes the demonstration of the inconsistency of the non-local actions. The other actions are of the generalized Wilson form and may have the Kogut-Susskind-like symmetry which forbids mass terms.
A NOTE ON PARASUPERSYMMETRY ALGEBRA
Authors: MERKEL U.
Published: November 2004

Rubakov and Spiridonov have recently sketched the outlines of parasupersymmetric quantum mechanics. In particular, they showed how the bilinear part of the parasupersymmetry algebra is realized for general order of paraquantization. The remaining multilinear part is addressed in this letter.
STOCHASTIC EMISSION OF PARTICLES IN ULTRA-RELATIVISTIC HEAVY-ION COLLISIONS
Authors:   EMU01, Adamovich M.I. , Aggarwal M.M. , Alexandrov Y.A. , Andreeva N.P. , Anson Z.V. , Arora R. , Avetyan F.A. , Badyal S.K. , Basova E. , Bhalla K.B. , Bhasin A. , Bhatia V.S. , Bogdanov V.G. , Bubnov V.I. , Burnett T.H. , Cai X. , Chasnikov I.Y. , Chernova L.P. , Chernyavski M.M. , Dressel B. , Eligbaeva G.Z. , Eremenko L.E. , Friedlander E.M. , Gaitinov A.S. , Ganssauge E.R. , Garpman S. , Gerassimov S.G. , Grote J. , Gulamov K.G. , Gupta S.K. , Gupta V. , Heckman H.H. , Huang H. , Jakobsson B. , Judek B. , Kachroo S. , Kadyrov F.G. , Kalyachina G.S. , Kanygina E.K. , Karabova M. , Kaul G.L. , Kaur M. , Kharlamov S.P. , Koss T. , Krasnov S.A. , Kumar V. , Lal P. , Larionova V.G. , Lepetan V.N. , Lindstrom P.J. , Liu L.S. , Lokanathan S. , Lord J. , Lukicheva N.S. , Luo S.B. , Mangotra L.K. , Marutyan N.A. , Maslennikova N.V. , Mittra I.S. , Mookerjee S. , Mueller C. , Nasrulaeva H. , Nasyrov S.H. , Navotny V.S. , Orlova G.I. , Otterlund I. , Palsania H.S. , Peresadko N.G. , Petrov N.V. , Plyushchev V.A. , Qian W.Y. , Raniwala R. , Raniwala S. , Rao N.K. , Rappoport V.M. , Rhee J.T. , Saidkhanov N. , Salmanova N.A. , Sarkisova L.G. , Sarkisyan V.R. , Schulz W. , Shabratova G.S. , Shakhova T.I. , Singh B. , Skelding D. , Söderström K. , Solovjeva Z.I. , Stenlund E. , Strausz S.C. , Sun J.F. , Svechnikova L.N. , Tolstov K.D. , Tretyakova M.L. , Trofimova T.P. , Tuleeva U. , Vokal S. , Wang H.Q. , Weng Z.Q. , Wilkes R.J. , Xu G.F. , Zhang D.H. , Zheng P.Y. , Zhochova S.I. , Zhou D.C. , Zhou J.C.
Published: November 2004

In this letter we show that most of the fluctuations in particle densities observed in relativistic heavy-ion collisions are consistent with stochastic emission, i.e., most of the correlations between produced particles are washed out due to the vast number of particles in the environment. We further explore the general trends by investigating different systems, energies and centrality cuts. Comparisons with the Fritiof model show that string fragmentation gives results similar to the data.
SCHWINGER-DYSON EQUATIONS IN QED AT NON-ZERO TEMPERATURE
Authors: ODINTSOV S.D. , SHIL’NOV YU. I.
Published: November 2004

The Schwinger-Dyson (SD) equations in QED at non-zero temperature are discussed. The β-function in local limit and at high temperature limit is found.
GELFAND-LEVITAN EQUATION AND QUASI-EXACT SOLVABILITY
Authors: USHVERIDZE A.G.
Published: November 2004

It is shown that following the Gelfand-Levitan approach and starting from L-parameter class of 1-dimensional quasi-exactly solvable models with M+1 explicitly calculable energy levels one can obtain a new (L+M+1)-parameter class of quasi-exactly solvable models with the same M+1 energy levels.
QUASI-EXACTLY SOLVABLE MULTI-DIMENSIONAL SCHRÖDINGER EQUATIONS
Authors: USHVERIDZE A.G.
Published: November 2004

A new method of constructing multi-dimensional quasi-exactly solvable models of quantum mechanics is proposed.
FINITE ELECTROWEAK THEORY WITHOUT A HIGGS PARTICLE
Authors: MOFFAT J.W.
Published: November 2004

A unified electroweak theory is formulated using non-local field theory without including a Higgs particle. The W and Z gauge boson masses are induced from one-loop vacuum polarization graphs and the non-local weak scale is determined by the W boson mass and the Fermi constant to be Λw=424 GeV . The tree graphs for the gauge bosons are identical to those of the standard local electroweak theory, so any violation of locality occurs only at the quantum level for the finite loop graphs. The fermion masses are obtained from a four-Fermi interaction with a spontaneously broken vacuum based on the fermion condensate [Formula: see text]. The problem of severe fine tuning for the quark condensates in the standard local point field theory is avoided in our non-local field theory. The theory contains only the known particle spectrum of leptons, quarks, the anticipated top quark, the W and Z gauge bosons and the photon. The quark condensates could generate a spectrum of heavy vector bound states at an energy scale ~1−2 TeV .
SPURIONS IN FUNCTIONAL AND OPERATOR QUANTIZATION OF STRING THEORY AND HARMONIC GAUGE
Authors: DEMICHEV A.P. , IOFA M.Z.
Published: November 2004

We discuss the difference between the Lagrange and the operator BRST quantization in string theory on Riemann surfaces of higher genus. An example of the harmonic gauge yielding the non-anomalous BRST Ward identity in the path integral Lagrange approach is studied in detail.
METHODS TO MEASURE (ε′/ε) TO THE LEVEL OF ~ 10−4 AT A Φ FACTORY
Authors: BERG R.C. , BODEN A.F. , BUCHANAN C.D. , CLINE D.B. , FOSHE T.
Published: November 2004

We describe the simulation of experiments for [Formula: see text] order to determine the sensitivity to ε′/ε parameters. Current theoretical estimates suggest that ε′/ε should be below 10−3 if the t quark mass is above 100 GeV. We show how measurements with a Φ factory operating in the range ℒ~2×1032 to 1033 cm −2 sec −1 can be used to improve the current world value of Re (ε′/ε). We also show how improvements on the value of Im (ε′/ε) (potentially a CPT violation) can be made, and how backgrounds can be studied using the channel [Formula: see text].
CONSISTENT CHIRAL QUANTUM ELECTRODYNAMICS
Authors: DEMARCO G. , FOSCO C. , TRINCHERO R.C.
Published: November 2004

We construct a unitary and renormalizable quantum field theory in 3+1 dimensions describing the interaction of chiral massless fermions with massive or massless photons.
RENORMALIZATION IN p-ADIC QUANTUM FIELD THEORY
Authors: SMIRNOV V.A.
Published: November 2004

A version of p-adic perturbative Euclidean quantum field theory is presented. It is based on a new type of the propagator which happens to be rather natural for p-adic space-time. Low-order Feynman diagrams are explicitly calculated and typical renormalization schemes are introduced: analytic, dimensional, and BPHZ renormalizations. The calculations show that in p-adic Feynman integrals only logarithmical divergences appear.
RUNNING COUPLING CONSTANTS AND GRAND UNIFICATION MODELS
Authors: GIUNTI C. , KIM C. W. , LEE U. W.
Published: November 2004

The evolution of the gauge coupling constants in the SU (N) and SO (N) grand unification models is examined. It is shown that the three coupling constants αs, α2, α1 in the minimal SU(5) model do not merge into one at 99% confidence level when they are extrapolated from the values at the mass scale MZ, whereas in its supersymmetric version, the coupling constants do merge into one within one standard deviation. In the SU (N) (with N > 5) models with a two-step symmetry breaking the coupling constants can merge into one, but these models are ruled out by the constraint imposed on the unification mass scale from the absence of proton decay. The SO (N) models with N ≥ 10 are shown to be consistent with the proton decay constraint. In particular, the unification scale for the SO(10) model is shown to be 1015~1016 GeV and the intermediate energy scale is 1013~1014 GeV .
ON THRESHOLD PION PHOTOPRODUCTION AND LOW-ENERGY THEOREMS
Authors: WORKMAN RON L. , ARNDT RICHARD A. , LI ZHUJUN
Published: November 2004

We show that low-energy data from the neutral-pion photoproduction reaction can be adequately described without resort to exotic mechanisms. An apparent discrepancy, which has been linked to recent measurements, appears to be due to assumptions regarding the rescattering correction and coupling constants. Consequences of this result are discussed.
A NUMERICAL ANALYSIS OF THE FULL ONE-LOOP RENORMALIZATION OF THE WEAK GAUGE BOSON MASSES FROM SUPERSYMMETRY
Authors: GOSDZINSKY P. , SOLÀ J.
Published: November 2004

We consider an analysis of the full one-loop radiative corrections to the weak gauge boson masses induced by the whole set of virtual supersymmetric particles entering a complete renormalization framework for electroweak interactions. Contrary to previous partial analyzes, based only on universal vacuum polarization effects, the full calculation reveals the existence of large regions of phenomenologically allowed supersymmetric parameter space where the overall gauge boson mass shifts, [Formula: see text], are negative and ranging typically between (−100, −300) MeV, even for sparticle masses of about 100 GeV. Prospects of detecting these radiative hints of supersymmetry in future collider experiments are encouraging but still tied to considerable improvement in the precision of the experiments.
ANOTHER DERIVATION OF A SUPERPARTICLE ACTION
Authors: FRADKIN E. S. , SHVARTSMAN SH. M.
Published: November 2004

It is shown that the reparametrization invariant superparticle action can be determined by constructing the path-integral representation for the causal Green function of a chiral superfield interacting with an external Maxwell superfield.
MASSIVE-QUARK BARYONS AS SKYRMIONS
Authors: RHO MANNQUE
Published: November 2004

Massive-quark baryons containing one or more charm (c) or bottom (b) quarks are described as massive scalar doublet fields "wrapped" by the soliton of the light (up and down) flavors. The spin-isospin transmutation that takes place to make the trapped scalar behave like heavy-flavored quarks is analogous to what happens to a scalar doublet in the presence of a 't Hooft–Polyakov monopole. The Wess–Zumino term plays a pivotal role here. This model predicts spectra that resemble closely those of quark models. This feature is interpreted in terms of an induced gauge (or Berry) structure associated with "fast" and "slow" degrees of freedom corresponding, respectively, to the massive- and light-flavor quarks involved in the baryon structure.
INTERACTING BOSONIC MODELS AND THEIR SOLUTION
Authors: COHEN RON , GEPNER DORON
Published: November 2004

A family of interacting bosonic models is studied. A picture is suggested where each such conformal field theory is tensored with a conjugate one to give a free bosonic theory. It is shown that the lattice of the bosonic theory is determined in each case, and how the spectrum and correlation functions can be calculated. It is explained how flat directions can arise in such theories, allowing for an exact solution for a family of parameters. A large class of examples is discussed in detail. It is shown that for any rational value of the central charge c ≥ 3 there is an infinite number of distinct rational N = 2 theories which can be contracted by this method.
ANYONS FROM DIRAC FERMIONS
Authors: HANSSON T. H. , SPORRE M. , LEINAAS J. M.
Published: November 2004

We show that interacting Dirac fermions in 2+1 dimensions behave as anyons in the non-relativistic limit. The reason is a spin-orbit coupling originating from both the magnetic μ · B-type interaction and the Thomas precession effect. We demonstrate this phenomenon by calculating and analyzing the Breit potential or QED and a scalar exchange theory to O(1/c2). We also show that there is a qualitative difference between the statistical phases arising from the magnetic interaction and from the Thomas precession, in that only the former can be detected as a Berry phase.
GINZBURG-LANDAU FROM FIELD THEORY
Authors: DAVIS R. L.
Published: November 2004

A complex scalar mean-field theory has semi-classical solutions that display macroscopic superfluidity. The U (1) global symmetry is spontaneously broken by a ground-state with uniform particle density. The Nambu-Goldstone boson of that breaking is sound, but unlike the case for vacuum configurations the speed at which the Nambu-Goldstone boson travels is variable; it is determined by an index of refraction due to fluctuations in the magnitude of the order parameter. This field-theoretic description is shown to be a fully dynamical generalization of the Ginzburg-Landau theory. It is confirmed that Abrikosov vortices of the Ginzburg-Landau theory are spinning vortices of the field theory. While vacuum configurations are time-independent points in the manifold of degenerate minima to the effective potential, the ground states for superfluid systems are characterized by geodesic trajectories, and the symmetry is always restored in the limit of zero density.
RENORMALIZATION GROUP AND VIRASORO CONSTRAINTS IN LIOUVILLE FIELD THEORIES
Authors: KUBOTA TAKAHIRO , CHENG YI-XIN
Published: November 2004

The idea of Wilson's renormalization group is applied to the 2-dimensional Liouville theory coupled to matter fields. The Virasoro structures including those of Liouville field are explicitly derived at the fixed point of the renormalization group flow. The Virasoro operators are transformed into another set of Virasoro operators acting in the target space and it is argued that the latter could be interpreted as those discovered recently in matrix models.
VARIATIONAL RANDOM PHASE APPROXIMATION FOR THE ANHARMONIC OSCILLATOR
Authors: DUKELSKY J. , SCHUCK P.
Published: November 2004

The recently derived Variational Random Phase Approximation is examined using the anharmonoic oscillator model. Special attention is paid to the ground state RPA wave function and the convergence of the proposed truncation scheme to obtain the diagonal density matrix.
CONSISTENCY OF β-DECAY DATA
Authors: WOOLCOCK W. S.
Published: November 2004

We obtain three independent values of the effective vector coupling constant [Formula: see text] for nuclear β-decay by using various pieces of experimental data (the neutron life-time and the β-decay asymmetry of polarized neutrons, data on the decays of kaons and hyperons, and the ft values of superallowed β+ decays). For superallowed decays we discuss various analyzes of the data. The reliability and consistency of the values of [Formula: see text] obtained in the different ways is assessed.
NON-SPLITTABLE EXTENSIONS OF THE VIRASORO AND SUPERCONFORMAL ALGEBRAS VIA PSEUDODIFFERENTIAL OPERATORS
Authors: FRADKIN E. S. , YA. LINETSKY V.
Published: November 2004

Applying the Weyl symbols techniques to the algebra of pseudodifferential operators on a circle and its extensions, a number of non-splittable Abelian, as well as infinite tower of non-Abelian, kernel extensions of the Virasoro and superconformal algebras have been explicitly constructed. The corresponding non-trivial cocycles appear as quantum corrections to the Poisson brackets when developing the Weyl multiplication formula. As an application, this construction may yield interesting generalizations of the KdV equation.
THREE-PARTICLE RAPIDITY CORRELATIONS IN PROTON-PROTON INTERACTIONS AT ISR ENERGIES
Authors: BREAKSTONE A. , CAMPANINI R. , CRAWLEY H. B. , CUFFIANI M. , DALLAVALLE G. M. , DENINNO M. M. , DOROBA K. , DRIJARD D. , FABBRI F. , FIRESTONE A. , FISCHER H. G. , FLÖGE H. , FREHSE H. , GEIST W. , GESSWEIN L. , GIACOMELLI G. , GOKIELI R. , GORBICS M. , GORSKI M. , HANKE P. , HEIDEN M. , HERR W. , ISENHOWER D. , KLUGE E. E. , LAMSA J. W. , LOHSE T. , MANKEL R. , MEYER W. T. , NAKADA T. , PANTER M. , POLI B. , PUTZER A. , RAUSCHNABEL K. , RENSCH B. , RIMONDI F. , SCHMELLING M. , SIROLI G. P. , SOSNOWSKI R. , SZCZEKOWSKI M. , ULLALAND O. , WEGENER D. , WUNSCH M. , YEUNG R. , ZUCCHELLI S.
Published: November 2004

Measurements are presented of short range three-particle rapidity correlation in pp interactions at c.m. energies [Formula: see text], 44 and 62 GeV. The data were obtained at the CERN Intersecting Storage Rings (ISR) using the Split Field Magnet Detector (SFM) with a minimum bias trigger. Three-particle short range rapidity correlations are observed for the (-+-) and (+-+) combinations; no short-range correlation is observed for the (---) and (+++) configurations. The rapidity range of the three-particle correlations is approximately the same as for the two-particle correlations.
EUCLIDEANIZATION OF MAJORANA AND WEYL FERMIONS
Authors: MEHTA MAYANIK R.
Published: November 2004

A continuous procedure is presented for euclideanization of Majorana and Weyl fermions without doubling their degrees of freedom. The Euclidean theory so obtained is SO (4) invariant and Osterwalder-Schrader (OS) positive. This enables us to define a one-complex parameter family of the N=1 supersymmetric Yang-Mills (SSYM) theories which interpolate between the Minkowski and a Euclidean SSYM theory. The interpolating action, and hence the Euclidean action, manifests all the continous symmetries of the original Minkowski space theory.
FUNCTIONAL DIFFERENTIAL REALIZATION OF THE KAC–MOODY ALGEBRA AND GROUP COHOMOLOGY
Authors: BAAQUIE B. E.
Published: November 2004

The Kac–Moody generators are realized as the central extension of the loop group generators. The exact expression for the central extension is obtained from the Wess–Zumino zero-cochain density via the descent equations of group cohomology.
NON SCALE-INVARIANT ISOCURVATURE PERTURBATIONS PRODUCED IN THE POWER-LAW INFLATION
Authors: SASAKI MISAO , SPOKOINY BORIS L.
Published: November 2004

We present a careful analysis of non scale-invariant insocurvature perturbation produced in the power-law inflation. We first derive the exact form of the two-point function for a massless scalar field φ in a power-law background, a (t) ∝ t1+n (n≫1). For generality, we allow the scalar field to have a small nonminimal coupling to gravity, ~ ξφ2 R (|ξ|≪1). We then regard φ as an axion-like field whose quantum fluctuation gives rise to an isocurvature perturbation with its amplitude proportional to a trigonometric function of φ. As a concrete example, we consider the case when φ is a Majoron and the baryon density fluctuation is produced in proportion to sin (φ/f) where f is the symmetry breaking scale. We find the resulting spectrum of the (baryon) isocurvature perturbation depends very much on the sign of n*, where 1/n* = 1/n + ξ. For n* > 0, corresponding to an infrared unstable scalar field, the spectrum is white noise on large scales and almost scale-invariant on small scales. On the other hand, for n* < 0, corresponding to an infrared stable scalar field, the spectrum is almost scale-invariant on all the scales.
MANIFEST AND NON-MANIFEST LORENTZ INVARIANCE FOR GAUGED SELF-DUAL BOSONS
Authors: GHOSH SUBIR , MITRA P.
Published: November 2004

The standard chiral way of gauging self-dual bosons can be described in either a non-manifestly Lorentz invariant formalism or a formalism where auxiliary fields are used to make Lorentz invariance manifest. The two descriptions are shown to be equivalent. The vector way of gauging, which is inconsistent in the second formalism, is shown to break Lorentz invariance in the first. Finally the new chiral way of gauging recently introduced by us in the first formalism is shown to admit a description in the second.
QUANTUM COSMOLOGY IN R1×S1×S2 TOPOLOGICAL SPACE
Authors: CHAKRABORTY SUBENOY
Published: November 2004

We have discussed classical and quantum cosmological phenomena for anisotropic Kantowski–Sachs model. The classical Lorentzian field equations are reduced to an autonomous system and are analyzed near critical point. The minisuperspace path-integral reduces to a single ordinary integration over the lapse, and we study this integral by lapse method. We find that the integral has an infinite number of saddle points, each one has identical contribution to the integral. Also matter-gravity wave function is considered for this metric.
THE TWO-DIMENSIONAL CHIRAL HIGGS MODEL
Authors: SCHAPOSNIK F. A. , TROBO M.
Published: November 2004

We show that the two-dimensional chiral Abelian Higgs model, though anomalous, can be consistently quantized provided that gauge degrees of freedom are adequately taken into account. In this way, the anomaly is canceled by a Wess–Zumino term and as a result, instanton contributions are eliminated from the partition function.
PERTURBATIVE RESULTS OF COLLECTIVE STRING FIELD THEORY
Authors: DEMETERFI KRESIMIR , JEVICKI ANTAL , RODRIGUES JOĀO P.
Published: November 2004

We present a summary of perturbative results obtained in the framework of collective string field theory. We discuss computations of tree-level scattering amplitudes, loop corrections to tachyon self-energy, ground state energy and finite temperature free energy. A comparison with results obtained in different approaches is given. We also discuss the physical implications of our results.
BRST ALGEBRA AND UNITARY TRANSFORMATIONS
Authors: OEHME REINHARD
Published: November 2004

Unitary transformations are considered in a state space of indefinite metric. They may correspond to representations of groups or to equivalence transformations. Although the BRST algebra provides for the definition of an invariant subspace for the representatives of physical states, there is no such subspace for unphysical states, which can have non-vanishing components in the physical subspace. These components may be removed by equivalence transformations, but they are also generated by Lorentz transformations. Unitary equivalences are used for the definition of invariant sets of unphysical (and physical) states.
STABILITY OF THE STATIC SOLITONS IN A PURE SPINOR THEORY WITH FRACTIONAL POWER NONLINEARITIES
Authors: AKDENIZ K.G. , BARUT A.O. , KALAYCI J. , OKAN S.E. , TEZGOR G.
Published: November 2004

Soliton solutions are obtained in a pure fermionic model with fractional power nonlinear self-interactions. The stability properties of the minimum energy solutions have also been investigated within the framework of the Shatah-Strauss formalism.
3He(3H, γ)6LI: SOURCE OF 6LI PRODUCTION IN THE BIG BANG?
Authors: FUNCK CHRISTOPH , LANGANKE KARLHEINZ
Published: November 2004

We have calculated the 3He(3H, γ)6Li reaction rate at big bang temperatures based on a microscopic study in the framework of the Generator Coordinate Method. It is discussed whether 6Li could be made by 3He+3H fusion in the early epoch of our universe.
TCP (TRUNCATED COMPOUND POISSON) PROCESS FOR MULTIPLICITY DISTRIBUTIONS IN HIGH ENERGY COLLISIONS
Authors: SRIVASTAVA PREM P.
Published: November 2004

On using the Poisson distribution truncated at zero for intermediate cluster decay in a compound Poisson process, we obtain TCP distribution which describes quite well the multiplicity distributions in high energy collisions. A detailed comparison is made between TCP and NB for UA5 data. The reduced moments up to the fifth agree very well with the observed ones. The TCP curves are narrower than NB at high multiplicity tail, look narrower at very high energy and develop shoulders and oscillations which become increasingly pronounced as the energy grows. At lower energies the curves are very close to the NB ones. We also compare the parametrizations, by these two distributions, of the data for fixed intervals of rapidity for UA5 data and for the data (at low energy) for e+e− annihilation and pion-proton, proton-proton and muon-proton scattering. A discussion of compound Poisson distribution, expressions of reduced moments and Poisson transforms are also given. The TCP curves and curves of the reduced moments for different values of the parameters are also presented.
MEAN-FIELD THEORY OF CONFINED PARTICLES: OFF-MASS-SHELL ASPECTS OF RELATIVISTIC WAVE FUNCTIONS
Authors: BANNUR V.M. , CELENZA L.S. , CHEN HUANG-HE , GAO SHUN-FU , SHAKIN C.M.
Published: November 2004

We study nonlinear equations in two variables which arise in a theory of nontopological solitons. For simplicity, we limit our considerations to a relativistic mean-field description of two scalar particles which form a bound state. We present results for a model in which the constituents have a momentum-dependent mass whose form is motivated by nonperturbative QCD studies. We discuss the probability distribution of the squared four-momentum, k2, of a particle of momentum kμ. We also introduce a definition of the “constituent mass” of our particles and comment on the relation of our model to the constituent quark model of hadron structure. The wave functions obtained have an interesting structure and are free of the on-mass-shell singularities which are present in solutions of conventional Bethe-Salpeter equations.
GENERATING FUNCTIONAL FOR WZW AND RELATED CURRENTS
Authors: HABA Z.
Published: November 2004

We compute the generating functional of currents in the bosonic as well as supersymmetric Wess-Zumino-Witten (WZW) model and in some of its (compact and noncompact) coset spaces. We discuss correlation functions of currents defined on a (super) Riemann surface.
OPERATOR REGULARIZATION AND THE COMPONENT WESS-ZUMINO MODEL
Authors: McKEON D.G.C. , SAMANT S.S. , SHERRY T.N.
Published: November 2004

Operator regularization has been shown to provide a method for computing Green’s functions without introducing any symmetry breaking regulating parameters, and without the occurrence of explicit infinities at any stage of the calculation. In this paper, we apply this technique to the component field Wess-Zumino model. Calculations to two-loop order of the two-point functions show that the supersymmetric Ward identities are satisfied, and that infinities do not arise. One-loop anomalous processes involving the chiral current, the spinor current and the stress-energy tensor are computed.
PERTURBING INDUCED QUANTUM SUPERGRAVITY IN 1 + 1 DIMENSIONS
Authors: SABRA WAFIC A. , THOMAS STEVEN
Published: November 2004

Starting from the formulation of induced (1, 0) supergravity in 1 + 1 dimensions we consider the effects of perturbing the theory with relevant operators that preserve rotational, translational and supersymmetry whilst breaking scale invariance. In particular we calculate the correlation functions  of graded SL (2R) currents Ja(x) in the presence of such perturbations from which we define central charge functions K. These functions are shown to be monotonic and are the analogue of Zamolodchikovs C-function as defined in usual conformal field theories.
THE DYNAMIC QUANTIZATION IN APPLICATION TO 2-DIMENSIONAL GAUGE CHIRAL MODELS
Authors: VERGELES S. N.
Published: November 2004

The dynamic quantization method suggested in Ref. 1 is developed here, on the basis of which the quantization of non-Abelian chiral Schwinger model is carried out. Under the dynamic quantization the regularization is realized by imposing the infinite set of the second class constraints for the dynamic variables in a deep ultraviolet region and by passing to the Dirac commutational relations. In this way success is achieved in realization of the traditional interpretation of the gauge theories which are known as anomal. The non-Abelian chiral Schwinger model proves to be gauge- and Lorentz-invariant.
N = 2 SUPERCONFORMAL ALGEBRA AND STRINGS IN BACKGROUND FIELD
Authors: ITOH TAKASHI , TAKAO MASARU
Published: November 2004

We discuss N = 2 superconformal algebra of superstring in a background field by investigating the operator products of the symmetry currents. It is shown that for the presence of N = 2 superconformal symmetry the compactified space should be a Ricci-flat Kähler manifold.
WESS-ZUMINO-WITTEN MODEL AS A THEORY OF FREE FIELDS
Authors: GERASIMOV A. , MOROZOV A. , OLSHANETSKY M. , MARSHAKOV A. , SHATASHVILI S.
Published: November 2004

The free field representation or "bosonization" rule1 for Wess-Zumino-Witten model (WZWM) with arbitrary Kac-Moody algebra and arbitrary central charge is discussed. Energy-momentum tensor, arising from Sugawara construction, is quadratic in the fields. In this way, all known formulae for conformal blocks and correlators may be easily reproduced as certain linear combinations of correlators of these free fields. Generalization to conformal blocks on arbitrary Riemann surfaces is straightforward. However, projection rules in the spirit of Ref. 2 are not specified. The special role of βγ systems is emphasized.

From the mathematical point of view, the construction involved represents generators of Kac-Moody (KM) algebra in terms of generators of a Heisenberg one. If WZW Lagrangian is considered as d−1 of Kirillov form on an orbit of KM algebra,3 then the free fields of interest (i.e. generators of the Heisenberg algebra) diagonalize Kirillov form and the action. Reduction of KM algebra within the same construction should naturally lead to arbitrary coset models.
EVIDENCE FOR THE COEXISTENCE OF INTRINSIC REFLECTION ASYMMETRY AND REFLECTION SYMMETRY IN 155Eu AND 153Eu
Authors: SHELINE RAYMOND K. , SOOD P. C.
Published: November 2004

The inverted odd-even staggering of the differential radii of the Eu isotopes from neutron number 88 through 93, and the Kπ = 5/2± parity doublets with magnetic moments tending towards the hybridized limit and with connecting enhanced El transitions in l55 Eu and 153 Eu suggest the existence of intrinsic reflection asymmetry in the ground state of the Eu isotopes. The average splitting energy between 3 parity doublets in 155 Eu is 63.8 keV, while it is 97.4 keV for the one parity doublet in 153 Eu . Decoupling parameters of the Kπ = 1/2± parity doublet bands in l55 Eu have opposite signs but are approaching the same absolute value as expected for intrinsic reflection asymmetric nuclei. However, the presence of the 3/2 [411] bands with octupole vibrations ~530 keV above also implies the coexistence of reflection symmetric spectra in the low energy regions of both 155 Eu and 153 Eu .
NUCLEAR MATTER WITH CONSTITUENT MESON QUANTA
Authors: MISHRA AMRUTA , MISHRA H. , MISRA S.P.
Published: November 2004

We discuss here some nonperturbative techniques of field theory, where we dress nuclear matter as a whole with off-mass-shell pions. Here s-wave pion pairs simulate the effect of σ-meson of the mean field approach of Walecka. The signatures are in agreement with earlier results along with new physical insight.
FERMIONIC SUPERCONDUCTIVITY IN THE DENSE WEINBERG-SALAM MODEL
Authors: FERRER E.J. , DE LA INCERA V. , SHABAD A.E.
Published: November 2004

The superconducting behavior of the W-condensate phase of the Weinberg-Salam liquid is investigated. The removal of the W-orientation degeneracy by a small external electromagnetic field imposed on the W-condensate is found. Against the background of the condensed W-mesons the left-lepton spectrum undergoes a restructuring with the appearance of an energy gap between all the particle-antiparticle states, and the joining of particles and antiparticles in the new spectrum. Some of these peculiarities are indicated as a signal of the electrical superconductivity of such a medium. The definitive conclusions about the fermion superconductivity are achieved by studying the contribution to the London’s equation of the one-fermion loop polarization operator against the W-condensate background at zero momentum. The London’s penetration depth λ L is found in the limit of small W-condensate amplitude.
NON-COMPACT WZW MODELS AS MASSLESS (QCD)2 AT INFINITE COUPLING
Authors: HABA Z.
Published: November 2004

Wess-Zumino-Witten (WZW) (compact and non-compact) coset Lagrangians arise as effective Lagrangians of Euclidean non-Abelian gauge fields coupled to (right- and left-handed) massless fermions in two dimensions. We choose coordinates on the non-compact coset in such a way that the WZW model becomes soluble through the functional integration. We interprete the model as a massless QCD (without the F2 gluon self-interaction). We discuss the fermionic Green's functions in this model. We show that the Fermi fields in (QCD) 2 become scale-invarient in the infinite coupling limit with a non-canonical scaling dimension.
POINT PARTICLE WITH EXTRINSIC CURVATURE
Authors: HUQ M. , OBIAKOR P. I. , SINGH S.
Published: November 2004

We have considered point particle action with extrinsic curvature having a geometric interpretation. It is shown that the Hamiltonian formalism possesses more gauge symmetries than the Lagrangian one. Equivalence of the BRST method in both formalisms is also exhibited.
LEADING INFRARED LOGARITHMS AND VACUUM STRUCTURE OF QCD3
Authors: GUENDELMAN E. I.
Published: November 2004

QCD 3 is a superrenormalizable massless theory; therefore off-mass-shell infrared divergences appear in the loop expansion. We show how certain infrared divergences can be subtracted by changing the boundary conditions in the functional integral, letting the vector potentials approach non-zero constant values at infinity. Infrared divergences, in the Green's functions, come together with powers of logarithms of the external momenta, and among the infrared divergences we deal with, there are those that give rise to the leading and first subleading logarithms. We show how for two-point functions it is possible to sum the leading and first subleading logarithms to all orders. This procedure defines a nonperturbative approximation for QCD 3. We find that in the ultraviolet region these summations are well defined, while in the infrared region, some additional prescription is needed to make sense out of them. From the construction developed to cancel infrared divergences, we derive the presence of arbitrarily large field strengths in the vacuum. We respect Lorentz invariance, because in this construction, one averages all directions and strengths of these fields. Possible applications to the infrared problem of QCD 4 are indicated.
O(3)-INVARIANT PROCESSES AT FALSE VACUUM DECAY IN GENERAL RELATIVITY
Authors: BEREZIN V. A. , KUZMIN V. A. , TKACHEV I. I.
Published: November 2004

We derived a general formula for the action for O(3)-invariant tunneling processes at false vacuum decay in general relativity. A general classification of bubble shell Euclidean trajectories is elaborated and explicit expressions for bounces for a number of processes like spontaneous vacuum creation of a double bubble (in particular in the vicinity of a black hole), subbarrier creation of the Einstein-Rosen bridge, tunneling of a black hole to the state of a wormhole, creation from nothing of two Minkowski worlds connected by a shell, etc., are given.
ELECTROWEAK BAU GENERATION ON THE LATTICE: REAL-TIME VS. EUCLIDEAN APPROACH
Authors: YU. GRIGORIEV D. , SHAPOSHNIKOV M. E.
Published: November 2004

We discuss possible approaches to the investigation of anomalous processes with fermion number nonconservation occurring in the hot early Universe. A real-time numerical technique for studying the ground state of gauge theories at high temperatures is developed. This problem is relevant to the scenario of electroweak BAU generation and some other topics. We present the results of real-time simulations of the Abelian Higgs model in (1 + 1) dimensions.
A BRST APPROACH TO MASSLESS GAUGE FIELDS OF HALF-INTEGER SPIN
Authors: DOMEIJ THOMAS
Published: November 2004

We present a program based on BRST techniques for how to obtain the conventional equations for totally symmetric tensor-spinors which describe free massless particles of arbitrary half-integer spin. We do so in a wave function representation in a flat space-time background of any even dimension.
THREE-SPIN CORRELATION OF THE ISING MODEL ON A KAGOMÉ LATTICE
Authors: LIN K. Y. , CHEN B. H.
Published: November 2004

Several local three-spin correlations are derived for the Ising model on a Kagomé lattice with anisotropic pair interactions. Three-spin correlation for three spins surrounding a triangle is derived for the Kagomé lattice Ising model with isotropic pair and triplet interactions at a particular temperature determined by pair interaction only.
ON THE SELF-CONSISTENT STATISTICAL THEORY OF STRUCTURAL, DYNAMICAL, AND THERMODYNAMIC SURFACE PROPERTIES OF ANHARMONIC CRYSTALS I: General Consideration and Properties of the Singular Surfaces of the Two-Dimensional Models
Authors: ZUBOV V. I. , BANYERETSE F. , TRETYAKOV N. P. , MAMONTOV I. V.
Published: November 2004

The correlative, or improved, unsymmetrized self-consistent field method (CUSF) is developed to study surface properties of anharmonic crystals. The equations for moments of the one-particle functions of atoms are obtained. Their solution determines the lattice relaxation near the surface, the amplitudes of anharmonic vibrations of atoms and the self-consistent potentials. A calculation method of the Helmholtz free energy of anharmonic crystal — vapour interface is developed. As an application, the properties of the singular surfaces of two-dimensional models with square and hexagonal lattices are calculated.
PHYSICAL PROPERTIES OF GERMANIUM BASED ALLOYS
Authors: DEMICHELIS F. , PIRRI C. F. , TRESSO E.
Published: November 2004

The purpose of this paper is to provide a consistent set of data for germanium based alloys using a number of different experimental techniques (optical and photoacoustic spectrometry, Electron Spin Resonance, conductivity and nuclear measurements) in order to know the consequences, both structural and electronic, of carbon incorporation into GeSi network.

From correlation between optical and electrical properties information is obtained about the behavior of band tails and the density of states in the gap.
AN ADAPTATION OF THE AUGMENTED SPACE APPROACH TO RANDOM MAGNETIC ALLOYS: AN APPLICATION TO Ni1−xFex
Authors: MOOKERJEE ABHIJIT , MISHRA ARUN K.
Published: November 2004

An application of CPA and cluster CPA to Ni rich Ni 1−x Fe x ferromagnetic alloy on the basis of multiband tight binding model is discussed. The augmented space method of Mookerjee1 has been extended to include the case where the potential is generated self-consistently. The tight binding Anderson Hamiltonian incorporates a term to account for the opposite Coulomb repulsion of electrons. The resulting Anderson-Hubbard Hamiltonian is used to consider the spin fluctuations and moment formation, on alloying, of the transition metal Ni with Fe.
CRITICAL POINT OF THE HONEYCOMB ANTIFERROMAGNETIC ISING MODEL IN A NONZERO MAGNETIC FIELD: FINITE-SIZE ANALYSIS
Authors: BLÖTE H. W. J. , WU F. Y. , WU X. N.
Published: November 2004

In this paper we present highly accurate numerical results of the determination of the critical point of the antiferromagnetic Ising model in a nonzero magnetic field for the honeycomb lattice, including the critical fugacity of a nearest-neighbor exclusion lattice gas. We compute the correlation length of the Ising model using a transfer matrix approach, and locate the critical point from the data on the correlation lengths using finite-size analysis. For the purpose of a maximum numerical accuracy, the analysis is carried out by taking transfer matrices proceeding in two perpendicular directions of the lattice.
PARITY VIOLATION AND SUPERCONDUCTIVITY IN DOPED MOTT INSULATORS
Authors: KHVESHCHENKO D. V. , KOGAN YA. I.
Published: November 2004

We study parity violating states of strongly correlated two-dimensional electronic systems. On the basis of mean field theory for the SU (2N)-symmetric generalization of the system involved we give the arguments supporting the existence of these states at a filling number different from one-half. We derive an effective Lagrangian describing the long wavelength dynamics of magnetic excitations and their interaction with charged spinless holes. We establish that the ground state of a doped system is superconducting and discuss the phenomenological manifestations of the parity violation.
DETERMINISTIC STATISTICAL INDEPENDENCE, NONPERIODIC SYMBOL SEQUENCES AND GIBBS DISTRIBUTIONS
Authors: McCAULEY JOSEPH L.
Published: November 2004

We use maps that generate a hierarchy of partitionings that can be organized onto a complete binary tree to ask the question when does the Gibbs distribution describe the frequency of distribution of iterates of a map over its natural partitioning. We are led to a generalization of Borel’s normal numbers, to symbol sequences where the blocks of symbols of a given length are distributed statistically independently, but with unequal frequencies. This result leads to a new universality principle based upon classes of initial conditions that limits the extent within which one can use an observed f(α) spectrum to infer the underlying dynamical system. An application to a turbulence experiment is discussed as an example. Our method is based upon the generation of symbol sequences by an algorithm and the consequent recovery of the corresponding initial condition by backward iteration of the map. Our analysis illustrates that measure one theorems in mathematics cannot serve as a guide to what should be the outcome of either computation or experiment.
AN ELLIPSOIDAL MOLECULES MODEL OF LIQUID CRYSTAL WITH QUADRUPOLAR INTERACTION: SELF-CONSISTENT FREE ENERGY
Authors: RASETTI M.G. , RASTELLO M.L.
Published: November 2004

We study the structure of the phase space for a system of N molecules of ellipsoidal symmetry, as a function of concentration and temperature. A classical lattice gas approximation is considered and a single molecule is described by a rigid ellipsoidal core with weak attractive tails along the long axis. The method adopted is a second-order mean-field approach – designed in such a way as to keep into account the fluctuations from equilibrium of the order parameters up to the fourth order – combined with a cumulant-cluster expansion, and improved by keeping track of the short-range correlations. Preliminary numerical calculations show the existence, in the case of zero attractive tail, of a second order phase transition.