bluuebunny/crossref_metadata_2025 huggingface dataset:
A COVARIANT GENERALIZATION OF BERRY’S PHASE
Authors: CAI Y.Q. , PAPINI G.
Published: November 2004

A covariant generalization of Berry’s phase is obtained from the proper time Schrödinger equation in which the role of Hamiltonian is played by the rest mass square operator. When this has degenerate eigenvalues, non-Abelian gauge fields arise in the manner shown by Wilczek and Zee for non-relativistic systems. The manifold of degenerate states corresponds to isotopic spin space.
LIGHT FERMION MASSES FROM SU(3)color×U(1)e.m.?
Authors: DAVIDSON A. , MARGOLIS B. , ROBINSON J. , VALIN P.
Published: November 2004

We consider the hypothesis that (i) mv≃0 because the neutrino is SU (3)c× U (1) e.m. neutral, (ii) m electron = 0 at the isospin limit where mu=md, and (iii) all first-generation fer-mions turn massless as αc, α e.m. →0. This hypothesis is supported by the empirical Abraham-Lorentz-type mass formula m=(ζ1Q+ζ2B)2, whose quadratic structure is attributed to a universal seesaw mechanism. We demonstrate how such a formula can stay exact even when switching on the inter-generational mixings. We present a complete model with the above features which gives quark and lepton masses and the K-M matrix, including CP violation.
NONPERTURBATIVE INSTABILITY OF BLACK HOLES IN QUANTUM GRAVITY
Authors: MAZUR PAWEL O.
Published: November 2004

The final stage of a black hole evaporation due to the Hawking effect is studied. One finds that, including the effects of quantum gravity, a black hole does not evaporate completely losing its energy steadily to a flux of created particles, but rather decays via a change in topology into an asymptotically flat space and an object which is a closed Friedmann Universe. This process is a genuine non-perturbative effect of quantum gravity and becomes the dominant “channel” of a black hole decay for black holes with masses slightly larger than the Planck mass Mp=1019 GeV. We calculate the decay rate of a Schwarzchild black hole with the mass M and discuss other decay “channels” by topology change. An explicit instanton mediating the decay is constructed by matching the Schwarzschild and the “wormhole” Friedmann instantons on the minimal sphere which is a Euclidean section of the event horizon. We show, as an example, that the decay process is mediated in the semi-classical approximation by the gravitational-axionic instanton. However, we argue that the phenomenon discussed in this paper does not depend on the particular instanton approximation and should be discussed in the framwork of the second quantization of interacting geometry suggested in Ref. 17. It is argued that in the more general setting of the Wheeler-De Witt equation, the wave functional describing a black hole is not gaussian because of the existence of an unstable mode.
REGULARIZING THE FUNCTIONAL INTEGRAL IN 2D-QUANTUM GRAVITY
Authors: MAVROMATOS N.E. , MIRAMONTES J.L.
Published: November 2004

We show that the usual conjectures made to understand Polyakov’s quantization of 2D-gravity in the functional integral approach arise from an explicit calculation using heat kernel regularization. The connection of these results with string theory is briefly commented upon.
LEFSCHETZ TRACE FORMULA AND BRST
Authors: SCHWARZ A.S.
Published: November 2004

The reduction of quantum constrained system to the unconstrained system with ghosts is analyzed.
RENORMALIZATION IN STOCHASTICALLY QUANTIZED QED: LOCAL ACTION FORMALISM
Authors: KARNAUKHOV S.N. , SUBBOTIN A.V.
Published: November 2004

The formalism of the stochastically quantized QED in terms of the local action is proposed. The renormalization constants and parameters of the theory are calculated in one loop approximation by tools of dimensional regularization. The theory is proved to be gauge-invariant renormalizable. The multiplicative renormalizability is shown to be possible only at the price of introducing the additional parameter into the kernels of the corresponding Langevin equations and noise correlations. In this case the renormalization of the electron mass and the photon wave-function coincides with that of the ordinary QED. The photon self-energy is transverse in the equilibrium limit.
GENERAL SUPERMODULAR TRANSFORMATION ON N=3 SUPER RIEMANN SURFACES OF GENUS 1
Authors: MYUNG Y.S.
Published: November 2004

We discuss N=3 super Riemann surfaces. When SO(3) modular parameters are souls (nilpotent parts), we obtain the general supermodular transformation on N=3 supertorus. In this case, SO(3) moduli are dependent parameters which are proportional to even and odd moduli (τ and εi) through the constants.
VACUUM POLARIZATION AND DYNAMICAL CHIRAL SYMMETRY BREAKING IN QUANTUM ELECTRODYNAMICS
Authors: GUSYNIN V.P.
Published: November 2004

The Schwinger-Dyson equation for the fermion mass function taking into account the vacuum polarization effects is considered. It is shown that even in the “zero-charge” situation there exists, at rather large coupling constant (α > αc), a solution with spontaneously broken chiral symmetry. The existence of the local limit in the model concerned is discussed.
SOME REMARKS ON NEUTRINO DECAY VIA A NAMBU-GOLDSTONE BOSON
Authors: KIM C.W. , LAM W.P.
Published: November 2004

The argument that the decay νi→νj+ϕ is suppressed in triplet majoron models by lepton number conservation is re-examined. It is found that in general the decay rates for νi→νj+ϕ and for [Formula: see text] should be of comparable magnitudes.
MASS SHIFTS FOR THE WEAK BOSONS IN THE INTEGRALLY CHARGED QUARK MODEL
Authors: DESHPANDE N.G. , RAJASEKARAN G.
Published: November 2004

We show that the integrally charged quark model predicts an upward shift of W and Z masses by 3.3 and 3.7 GeV respectively, as compared to the fractionally charged quark model. When combined with radiative corrections and compared with experimental data on MW and MZ, a heavier top quark, than in the fractionally charged quark model, is implied.
QUANTUM SUPERGROUPS AND SOLUTIONS OF THE YANG-BAXTER EQUATION
Authors: BRACKEN A. J. , GOULD M. D. , ZHANG R. B.
Published: November 2004

A method is developed for systematically constructing trigonometric and rational solutions of the Yang-Baxter equation using the representation theory of quantum supergroups. New quantum R-matrices are obtained by applying the method to the vector representations of quantum osp (1/2) and gl (m/n).
THE ATTENUATION OF THE PERIODIC TABLE
Authors: COOK NORMAN D.
Published: November 2004

Unique among models of nuclear structure, the face-centered-cubic (FCC) lattice model predicts the attenuation of the periodic table at Z<110 and the impossibility of superheavy nuclei. The total binding energies of superheavy nuclei in the FCC model (109<Z<127) were calculated on the basis of parameters obtained from a least-squares best-fit for 914 nuclei (Z<99). No indication of increased stability was found for any of the transuranic elements.
$K_L^0 \to 2\pi $ AND $K_L^0 \to \pi ^0 e^ + e^ - $ WITHOUT CP-VIOLATION
Authors: NAKAMURA SEITARO , NAKAZAWA NOBUYA
Published: November 2004

Neutral K-meson system is analyzed in the framework of SU(2) (isospin: τ)×SU(2) (hypercharge spin: ζ) symmetry. Four neutral K-mesons exist and among them there is a longlived CP-even state which can decay into the 2π or the π0 e+e− state. The branching ratio of the latter mode is expected to be much larger than in the standard model.
GAUGE-NEUTRAL MATTER IN A THREE-GENERATION SUPERSTRING COMPACTIFICATION
Authors: BERGLUND PER , HÜBSCH TRISTAN , PARKES LINDA
Published: November 2004

The complete set of gauge-neutral matter superfields (singlets) is parametrized for an R-symmetric three-generation Calabi-Yau superstring compactification. Unlike the number of matter 27s and 27*s, the number of singlets increases when the defining polynomials are made R-symmetric. We also verify the existence of certain flat directions in the field space which enables one to deform this (2, 2)-compactification into an asymmetric (2, 0)-compactification.
SEARCH FOR EXTENDED CONFORMAL ALGEBRA
Authors: CHANG DARWIN , KUMAR ALOK , WANG JIN
Published: November 2004

We search for the extended conformal algebra with two spin-s (s: integer) and one spin-1 generators. This search is inspired by the existence of chiral algebra in the Gaussian model for rational radius. For odd s, the conformal properties of the three-point functions imply that a general fusion rule can be reduced to those of the Gaussian model. For arbitrary even s, these conditions are weaker. In particular, for s=2 we show that the chiral algebra of the Gaussian model is the unique extended conformal algebra with the value of the central charge fixed to be c=1. It is also shown that the conformal generator is necessarily a bilinear of the spin-1 generator just as the Gaussian model. We conjecture that this remains true for arbitrary value of s.
ON THE ADDITIONAL MECHANISM OF HIGH-MASS DIFFRACTION DISSOCIATION, LARGE pt AND HEAVY PARTICLE PRODUCTION
Authors: NAZIROV M.T.
Published: November 2004

The possibility of receiving diffractively excited high masses at the expense of large virtualities of the interacting quarks has been considered. It is the quark decays that result in large pt and heavy particle production.
CONSTRAINTS ON THE FOURTH-GENERATION NEUTRINOS FROM THE LEP DATA
Authors: KOGO JUN , TAZAKI YUICHI , TSAI S. Y.
Published: November 2004

The LEP data on δNν, the number of neutrino species beyond the known three, are analyzed with a view to obtain constraints on extra neutrinos. The analysis is carried out in a reasonable gauge-model framework in which a fourth-generation left-handed neutrino, νh L , conspires with its right-handed counterpart, N R , to yield two Majorana neutrinos, ξ and ζ, or one Dirac neutrino, ν D . It is shown that, from the experimental value of δNν alone, one may derive constraints on mass and life-time of ξ, ζ and ν D and on the mixing between νh L and any of the familiar νe L , νμ L and vτL.
COMMENT ON THE DECAY Z0 → π0γ
Authors: HIKASA KEN-ICHI
Published: November 2004

The processes γ* → π0γ and Z → π0γ, for which a recent study found sizable rates, are examined. It is shown that a general procedure based on chiral anomaly and PCAC is not sufficient to fix these rates, although the standard π0 → γγ rate can be derived. Calculation of the one-loop diagrams shows that the rates are much suppressed. Two distinct formulations with massless and massive pions are presented, which give the same conclusion.
MATHEMATICAL ASPECTS OF THE NON-PERTURBATIVE 2D QUANTUM GRAVITY
Authors: ITS A. R. , KITAEV A. V.
Published: November 2004

We present rigorous mathematical results for the continuous limit for the hermitian matrix model in connection with the non-perturbative theory of 2D quantum gravity.
THE NON-CYCLIC BERRY PHASE
Authors: WEINFURTER HARALD , BADUREK GERALD
Published: November 2004

By analyzing the change of the polarization of a thermal neutron beam on its passage through a magnetic field rotating at various speeds, it is demonstrated that geometric phase shifts of quantum states first introduced by Berry can be observed also for non-cyclic incomplete evolutions in parameter space.
ON THE LANGEVIN EQUATION FOR STOCHASTIC QUANTIZATION OF GRAVITY
Authors: NAKAZAWA NAOHITO
Published: November 2004

We study the Langevin equation for stochastic quantization of gravity. By introducing two independent variables with a second-class constraint for the gravitational field, we formulate a pair of Langevin equations for gravity which couples with white noises. After eliminating the multiplier field for the second-class constraint, we show that the equations lead to stochastic quantization of gravity including a unique superspace metric.
THE HIDDEN KAC-MOODY SYMMETRY OF THE GEOMETRIC ACTIONS
Authors: ARATYN H. , NISSIMOV E. , PACHEVA S.
Published: November 2004

A general formalism is proposed to study infinite-dimensional Noether symmetries in arbitrary field theories on group coadjoint orbits as well as in their gauged versions (coset geometric models). The basic tools are generalized group composition laws valid for any geometric action. As a main application, we present a general scheme for constructing the "hidden" Kac-Moody currents.
RECENT RESULTS IN B PHYSICS
Authors: MILLER DAVID H.
Published: November 2004

Recent results in B meson physics are reviewed.
THREE-DIMENSIONAL TOPOLOGICAL FIELD THEORIES AND STRINGS
Authors: CARLIP S. , KOGAN I.
Published: November 2004

We discuss the status of the program to reformulate string theory as a theory of topological fields and gravity in 3 dimensions.
FRACTIONAL STATISTICS INDUCED BY GAUGE FIELDS
Authors: CHATTERJEE ASHOK , SREEDHAR V.V.
Published: November 2004

An explicit extension of Polyakov’s analysis of a scalar particle coupled to an Abelian Chern-Simons gauge theory to the case of two particles and arbitrary values of the coupling is given. A simple proof of the emergence of fractional statistics induced by the gauge field follows within the path-integral framework.
AN ACTION FOR SUPER-W3-GRAVITY
Authors: BASTIANELLI FIORENZO
Published: November 2004

A superspace action for non-chiral super-W3-gravity is constructed. It generalizes the chiral result of Hull, and like him we assume a stronger condition on the dijk tensors than in W3-gravity. By introducing auxiliary superfields in rigid superspace, we are able to reduce the problem to the gauging in each chiral sector separately.
IMPLICATIONS OF THE RECENT SOLAR NEUTRINO EXPERIMENT FOR PARTICLE PHYSICS
Authors: FUKUGITA M. , YANAGIDA T.
Published: November 2004

Physical implications of the results of recent solar neutrino experiments from the Homestake, Kamioka and Baksan Laboratories are discussed. We argue that the results from Homestake and Kamioka, if the two data sets are combined, strongly suggest some unusual neutrino properties rather than the modification of astrophysical models of the sun. If the time variation of neutrino captures, as observed at Homestake, is a statistical fluke, the neutrino conversion in matter proposed by Mikheyev and Smirnov among several possibilities yields the most attractive explanation for the neutrino flux deficit. We remark that the solution includes the possibility predicted by simple SO(10) models and it is tested by the gallium experiment. If the time variation at Homestake is true, on the other hand, one must explain why such an effect is not seen at Kamiokande. We stress that it is still possible to make a particle physics model which explains the two apparently contradictory observations.
AMPLITUDES IN THE N=2 STRING
Authors: BONINI MARISA , GAVA EDI , IENGO ROBERTO
Published: November 2004

We study the properties of amplitudes in the closed string theory based on the N=2 worldsheet supergravity. The one-loop correction to the three-point amplitude is computed and compared to the effective field theory result. We discuss the peculiar kinematics arising from the (2, 2) signature of the space-time and its role in the factorization properties of the amplitudes.
ASYMPTOTIC PROPERTIES OF RANDOM WALKS ON p-ADIC SPACES
Authors: LUCIO J.L. , MEURICE Y.
Published: November 2004

We give an upper and a lower bound for the average distance covered after n steps for a family of random walks on a D-dimensional p-adic space. We mention the implications of this result for the critical dimensions of scalar field theories on such a space.
CHARGED HIGGS BOSON DECAY H± → ϒW±: THE EFFECTS OF P- AND D-STATES
Authors: ROBINETT R. W. , WEINKAUF L.
Published: November 2004

We calculate the effects of including P- and D-wave quarkonium states in the charged Higgs decay mode H± → ϒW±. We find no interesting region of parameter space in which the P- and D-wave contributions have a significant effect.
SCALING MASS PARAMETERS OF HADRONS, QUARKS AND SUBQUARKS
Authors: TERAZAWA HIDEZUMI
Published: November 2004

It is suggested that the current mass of light quarks be scaled to those of subquarks which can be as small as 45 GeV and that the "electrostrong" gauge theory for hadrons may appear as an effective theory in QCD as the electroweak gauge theory for quarks with the scaling relation of mH/mW = mσ/mρ which predicts mH ≅ 94 GeV .
EXACT YUKAWA COUPLINGS FROM TOPOLOGICAL LANDAU–GINZBURG MODELS
Authors: GIVEON AMIT , SMIT DIRK-JAN
Published: November 2004

The Yukawa couplings of (2, 2) superstring vacua of matter fields, corresponding to untwisted (c, c) marginal chiral states, are computed exactly, as functions of the moduli, using d = 3 topological Landau–Ginzburg models.
ARE THE COSMIC STRINGS SEEN AS THE DISLOCATIONS?
Authors: FUJISHIRO TAKEHIKO T. , HAYASHI MITSUO J. , TAKESHITA SHOJI
Published: November 2004

The effective action from the heterotic string compactification is studied on the manifolds with absolute parallelism. The cosmic string solutions resulting from the effective action are discussed in analogy with the dislocations in 3-dimensional crystalline solid. The cosmic string density is concluded to be given by the torsion tensor of space-time, which gives rise to a compactification at least in 1-dimensional direction in space-time. It is also shown that the contorsion tensor defines the deficit angle. We have found a stringy solution in a 6-dimensional model on M4 × T2 which coincides with that of Greene et al.,5 but the string energy density depends only on torsion, therefore independent of the space-time metric.
THE EMC EFFECT IN A NUCLEONIC DESCRIPTION
Authors: MA BO-QIANG
Published: November 2004

Deep inelastic lepton-nucleus scattering is treated by considering the nucleus as a bound system of nucleons based on the light-cone quantum field theory. This method has the advantages that the impulse approximation is justified and that baryon number conservation is guaranteed. However, the ambiguities in identifying the structure function for bound nucleons in the conventional nucleonic approach seem not to have been avoided. It is also shown that a consistent calculation gives an unreasonably large Q2 dependence in the calculated nuclear structure function if one makes the most natural assumption to identify the off-"energy"-shell structure function for bound nucleons.
GLOBAL PROPERTIES OF MULTIPLICITY DISTRIBUTIONS AND MULTIPLICITY CORRELATIONS IN e+e- ANNIHILATION AT LEP ENERGIES AS A MEASURE OF COHERENT DYNAMICS
Authors: BARSHAY SAUL
Published: November 2004

We study the possibility of the observable emergence of dynamical forward-backward multiplicity correlations among produced charge hadrons, and of a steadily broadening multiplicity distribution in e+e- annihilation at LEP. It is important to measure three related global properties. These reflect coherent dynamical processes in and among jets.
THE $W^{(2)}_3$ CONFORMAL ALGEBRA AND THE BOUSSINESQ HIERARCHY
Authors: MATHIEU P. , OEVEL W.
Published: November 2004

The classical [Formula: see text] algebra Polyakov is shown to be equivalent to the second Poisson structure of a new integrable hierarchy of nonlinear equations. The hierarchy is related to the Boussinesq hierarchy by interhcanging the roles of the space and time variables x and t in the Boussinesq equation. From this relation the Miura map, relating the new hierarchy to its modified version, can be derived systematically. It is found to be equivalent to the known free field representation of the [Formula: see text] algebra.
SPIKY HIGHER GENUS STRINGS
Authors: AMBJØRN J. , BELLINI A. , JOHNSTON D.
Published: November 2004

It is clear from both the non-perturbative and perturbative approaches to two-dimensional quantum gravity that a new strong coupling regime is setting in at d = 1, independent of the genus of the worldsheet being considered. It has been suggested that a Kosterlitz–Thouless (KT) phase transition in the Liouville theory is the cause of this behavior. However, it has recently been pointed out that the XY-model, which displays a KT transition on the plane and the sphere, is always in the strong coupling, disordered phase on a surface of constant negative curvature. A higher genus worldsheet can be represented as a fundamental region on just such a surface, which might seem to suggest that the KT picture predicts a strong coupling region for arbitrary d, contradicting the known results. We resolve the apparent paradox.
MASSES OF D AND B MESONS AND CORNELL POTENTIAL
Authors: ARAFAH M. R. , FAYYAZUDDIN
Published: November 2004

An approximate scheme is formulated and used to calculate ground state energies for [Formula: see text] system (q=u,d,s; Q=c,b) with Cornell potential. It is shown that predicted values agree well with the D and B masses. Spin-dependent potential and relativistic corrections are taken into account, We find that B and ηb mesons lie close to masses ( GeV ) m(B*)=5.33, [Formula: see text], m(Bs)=5.39, and m(ηb)=9.32. The ordering of 1p levels for [Formula: see text] system is discussed.
A COVARIANT HAMILTONIAN FOR GRAVITY THEORIES
Authors: NESTER JAMES M.
Published: November 2004

Differential form methods are used to obtain a covariant Hamiltonian formulation for any metric-compatible gravitational theory. The Hamiltonian includes a covariant expression for the conserved quantities of an asymptotically flat or constant curvature space. Several applications are noted.
EXACT SOLUTION OF TWO-DIMENSIONAL GRAVITY VIA ANALYTIC CONTINUATION OF MATRIX MODEL
Authors: SILVESTROV P. G. , YELKHOVSKY A. S.
Published: November 2004

We discuss recent progress in the formulation and solutions of two-dimensional quantum gravity beyond the perturbation theory.
THE PHASE STRUCTURE OF TWO-DIMENSIONAL PURE LATTICE GAUGE THEORIES WITH CHERN TERM
Authors: G. KOVÁCS TAMÁS , WHEATER JOHN F.
Published: November 2004

We study the phase structure of two-dimensional pure lattice gauge theories with Wilson plus Chern action. Since the Chern term is purely imaginary it introduces a rich phase structure compared to the originally trivial Wilson model. The Zn model is considered in detail and it is proved that for n > 2 it has an infinite number of first order phase transitions. Confinements is maintained in pure phases but at the phase transition points the string tension vanishes for certain charges.
REMARKS ON REALIZING CLASSICAL AND QUANTUM W3 SYMMETRY
Authors: MOHAMMEDI NOUREDDINE
Published: November 2004

The relation between Jordan algebras and the nonlinear W3 algebra is explored quantum mechanically. Realization of classical W3 symmetry assumes the existence of some constant coefficients dijk (i,j,k = 1, … D) obeying some algebraic constraints. Recent works produced solutions to these constraints and established a link with Jordan algebras for the four special dimensions D = 5, 8, 14 and 26. In the present work we consider a general free field realization of quantum W3 and show that this relation with Jordan algebras breaks down at least for D = 5 and 8.

We also present some general solutions to the dijk constraints for D = 2 and D = 3 cases. The D = 2 solution is then used in the free field construction and Fateev and Zamolodchikov's realization is obtained as a special case of this solution.
INDUCED TWO-DIMENSIONAL QUANTUM GRAVITY WITH GENERAL ACTION
Authors: ODINTSOV S. D.
Published: November 2004

The two-dimensional quantum gravity with general action consisting of local and non-local parts is investigated. It is shown that in the light-cone gauge there exists a symmetry which leads naturally to the SL (2,ℝ) Kac–Moody current algebra. The structure of the renormalization is discussed.
COMMENTS ON GENERALIZED QUANTUM HAMILTONIAN REDUCTIONS
Authors: KAWAI TOSHIYA , NAKATSU TOSHIO
Published: November 2004

We study the process of generalized quantum Hamiltonian reductions using characters of the fractional current algebra. We also comment on the connection to the N = 2 superconformal symmetry.
RANDOM MATRICES WITH DISCRETE SPECTRUM AND FINITE TODA CHAINS
Authors: KAVALOV AL. R. , MKRTCHYAN R. L. , ZURABYAN L. A.
Published: November 2004

Restricting the eigenvalues of matrices in random matrix models produces different models (Hermitian, unitary, (anti)symmetric, Penner's, etc.). We consider the model in which the eigenvalues receive values from some discrete finite set of points, establish the connection of such a model with a finite Toda chain and study the details of this connection. We derive also the string equation, which in the limit, when eigenvalues become dense on a real axis, tends to the usual string equation.
PRESENT STATUS OF VENUSVENUS
Authors:   The VENUS Collaboration: K. Abe, K. Amako, Y. Asano, Y. Arai, H. Boerner M. Chiba, Y. Chiba, M. Daigo, T. Emura, I. Endo, M. Fukawa, T. Fukui, Y. Fukushima, J. Haba, I. Hayashibara, Y. Hemmi, M. Higuchi, T. Hirose, Y. Hojyo, Y. Homma, Y. Hoshi, Y. Ikegami, N. Ishihara, T. Kamitani, N. Kanematsu, J. Kanzaki, R. Kikuchi, T. Kondo, K. Kubo, H. Kurashige, K. Maehata, T. Matsui, M. Minami, K. Miyake, S. Mori, Y. Nagashima, Y. Nakagawa, T. Nakamura, I. Nakano, Y. Noguchi, S. Odaka, K. Ogawa, T. Ohama, T. Ohsugi,, Sugimoto Shojiro
Published: November 2004

The TRISTAN e + e − collider came into operation in the last October. The first beam collision was confirmed with the VENUS detector on November 19, '86. Then we have observed 56 Bhabha events and 16 hadronic events for the integrated luminosity of 93 nb −1 at [Formula: see text]. R-value obtained by a preliminary quick analysis is 5.7±1.6. Here we report the present status and the results of the VENUS experiment.
Calculation and Phenomenology of Two Body Decays of Neutralinos and Charginos to W, Z, and Higgs Bosons
Authors: GUNION J.F. , HABER H.E. , Barnett R.M. , Drees M. , Tata X. , Karatas D. , Baer H.
Published: November 2004

We give explicit formulas for the decays of the neutralinos and charginos of the minimal model of supersymmetry into other neutralinos and charginos plus a W, Z, or Higgs boson. The important features of these decays are illustrated and their phenomenological implications discussed. In general, this class of two-body decays is dominant for the heaviest charginos and neutralinos.
Signatures for a New Supersymmetric Left-Right Gauge Model From Superstrings
Authors: GUNION J.F. , HEWETT J.L. , MA E. , RIZZO T.G.
Published: November 2004

We consider the phenomenological implications for the Superconducting Super Collider of a new supersymmetric left-right symmetric model, motivated by E6 compactification in superstring theories.
CLASSICAL MODELS FOR REGGE TRAJECTORIES
Authors: BIEDENHARN L.C. , VAN DAM H. , MARMO G. , MORANDI G. , MUKUNDA N. , SAMUEL J. , SUDARSHAN E.C.G.
Published: November 2004

Two classical models for particles with internal structure and which describe Regge trajectories are developed. The remarkable geometric and other properties of the two internal spaces are highlighted. It is shown that the conditions of positive time-like four-velocity and energy momentum for the classical system imply strong and physically reasonable conditions on the Regge mass-spin relationship.
ENERGY LEVELS OF QUARKONIA IN POTENTIAL MODELS
Authors: LICHTENBERG D.B.
Published: November 2004

We review the subject of the energy levels of light and heavy quark-antiquark bound states in potential models, with emphasis on potentials which are motivated from quantum chromodynamics. In addition to pointing out the successes of potential models, we discuss problems with the potential approach, including uncertainties in the form of the potential, its spin dependence, its transformation properties, and its nondiagonal terms. We consider two-body wave equations with both nonrelativistic and relativistic kinematics, pointing out that in the latter case, a wide variety of different wave equations have been used in the literature.
THEORY OF RELATIVISTIC EXTENDED OBJECTS
Authors: BOHM A. , BOYA L.J. , KIELANOWSKI P. , KMIECIK M. , LOEWE M. , MAGNOLLAY P.
Published: November 2004

Physical ideas and mathematical methods of molecular and nuclear physics are extended into the relativistic domain. The resulting models are noncanonical modifications of restricted modes of the string. They describe collective motions of relativistic extended objects in terms of variables which are derived from the symmetry group (for the center-of-mass motion) and from the spectrum generating group (for the intrinsic motion). The simplest relativistic model of this kind is used to calculate spectrum and radiative transitions of hadrons.
TWISTED VERTEX OPERATOR AND STRING THEORY
Authors: SORBA P. , TORRESANI B.
Published: November 2004

The Kac-Peterson-Lepowsky construction of level 1 representations for simply laced Kac-Moody algebras via twisted vertex operators is explicated. In the context of string theory, the symmetry breaking relative to the twist condition is described and the zero-mode space worked out in detail.
PROPERTIES OF GLUON JETS: A REVIEW
Authors: SUGANO KATSUHITO
Published: November 2004

The properties of gluon jets are reviewed from an experimental point of view. The measured characteristics are compared to theoretical expectations. Although neither data nor models for the gluon jets are in the mature stage, there are remarkable agreements and also intriguing disagreements between experiment and theory. Since much interesting data have begun to emerge from various experiments and the properties of gluon jets are deeply rooted in the basic structure of non-Abelian gauge theory, the study of gluon jets casts further light on our understanding of QCD. Finally, the future prospects are discussed.
THEORETICAL MODELS FOR ATOMIC CHARGE TRANSFER IN ION-ATOM COLLISIONS
Authors: JAKUBAßA-AMUNDSEN D. H.
Published: November 2004

The current theoretical models for the description of electron transfer in adiabatic, intermediate and high-energy collisions are reviewed. Particular emphasis is laid on the recent development of atomic theories suited for fast or asymmetric ion-atom encounters. The comparison with other theories and with experimental data on total as well as differential capture cross sections is used to determine the applicability of a specific model. The selected examples concern capture to bound states, to continuum states, radiative transfer as well as capture in the presence of an isolated nuclear resonance.
THE PERTURBATED c < 1 CONFORMAL FIELD THEORIES AS REDUCTIONS OF SINE-GORDON MODEL
Authors: SMIRNOV F. A.
Published: November 2004

The prospects are outlined by obtaining the massive perturbations of c < 1 conformal field theories as certain reductions of the Sine-Gordon model. An example of the phenomenon is described in details.
PRODUCTION OF DILEPTONS BY BREMSSTRAHLUNG DURING THE STOPPING OF RELATIVISTIC HEAVY IONS
Authors: LIPPERT THOMAS , GRÜN NORBERT , SCHEID WERNER
Published: November 2004

Lepton pairs are created by the bremsstrahlung during the stopping of nuclei in relativistic heavy ion collisions. The probability distribution for central collisions is derived in the first order perturbation theory. For the nuclear current density, a model is used which assumes point-like nuclear charges and a velocity of the nuclei parametrized with respect to the deceleration and transparency of the reaction. Differential probability distributions for muon pairs are calculated for central collisions of 238 U on 238 U at E lab = 200 GeV/nucleon .
QCD2 AS THE THEORY OF MATTER FIELDS IN A CHIRAL BACKGROUND
Authors: SARADZHEV FUAD M.
Published: November 2004

On the physical states, two-dimensional quantum chromodynamics ( QCD 2) is shown to reduce to the theory of fermions in a chiral background.
VARIATIONAL FORMS AND TWO-DIMENSIONAL R2-GRAVITY
Authors: BURLANKOV DMITRY , PAVLOV ALEXANDER
Published: November 2004

We introduce variational forms, which are generalizations of Cartan's forms,1 and investigate 2-dimensional R2-gravity using them.
BRAIDING MATRICES OF CONFORMAL BLOCKS AND COSET MODELS
Authors: ITOYAMA H. , SEVRIN A.
Published: November 2004

We explain, from the Knizhnik-Zamolodchikov equation, the coincidence of the braiding matrices of conformal field theories having current algebras with face Boltzmann weights (at infinite spectral parameter) of the corresponding generalized Toda system (GTS). A vertex-height correspondence is introduced in the WZW theory. Braiding matrices of coset models are found to factorize into those of the WZW theories and, as an example, we evaluate those of the Ising model.
TYPE II SUPERSTRINGS ON TWISTED GROUP MANIFOLDS AND THEIR HETEROTIC COUNTERPARTS
Authors: FERRARA SERGIO , FRE’ PIETRO
Published: November 2004

We construct Type II superstrings in four space-time dimensions compactified on a twisted Wess-Zumino-Witten model based on the group SU(2)3. It is shown that within this framework, it is possible to obtain models with N=6, 5 and 3 space-time supersymmetries, in addition to the usual models with N=8, 4 and 2. The map of these models into the corresponding heterotic superstrings with N=4, 2 and 1 space-time supersymmetries is also derived: in complete analogy to the compactifications on six-dimensional manifolds also in this case this map from Type II to heterotic superstrings corresponds geometrically to the embedding of the 9-dimensional compact manifold spin-connection into the gauge connection. The superstring compactifications we discussed are equivalent to asymmetric orbifold constructions in six-dimensions with no necessity, however, of introducing chiral bosons.
INTERMEDIATE SCALE BREAKING FOR ORBIFOLD COMPACTIFIED MODELS WITH TETRAHEDRAL POINT GROUP
Authors: DJEBBOUR M.Y.
Published: November 2004

For orbifolds with tetrahedral point group and embedding of the point-group in the SU(3) of E6×SU(3)⊂E8 and the discrete translations in E8, we study the different breakings of E6 to realistic low-energy gauge groups.
TWO DIMENSIONAL QUANTUM GRAVITY AND STRINGS
Authors: TSEYTLIN A.A.
Published: November 2004

We discuss some recent suggestions about a relation between 2-d quantum gravity and string theory. We consider the general 2-d σ model with D-dimensional target space coupled to 2-d quantum gravity and give arguments in favor of the conjecture that the effective theory which describes this system in the conformal gauge may be interpreted as a a model with a D+1-dimensional target space with the conformal factor of the metric playing the role of the D+1 coordinate. The latter σ model must be Weyl invariant while the original one may be arbitrary. The conformal “split” invariance which must be present in the conformal gauge imposes no restrictions on the original σ model couplings, but restricts the additional (D+1-dimensional) couplings which appear in the D+1-dimensional σ model.
l-REDUCTION AND TWISTED CONFORMAL FIELD THEORY
Authors: KATO HIDEYUKI
Published: November 2004

Theory of l-reduction of KP hierarchy is investigated from a view point of conformal field theory. Twisted conformal field theory emerges naturally in the discussion. Possible application of this kind of connection between hierarchy and CFT is suggested.
ON FERMI-BOSE CORRESPONDENCE IN (2 + 1) DIMENSIONS
Authors: KOVNER A.
Published: November 2004

We consider the correspondence between the O(3) nonlinear σ-model with the Hopf invariant at θ = π and a four-fermi SU(2) invariant theory in (2 + 1) dimensions. It is shown that the two theories have a very similar phase structure. This includes the pattern of breakdown of various symmetries and a spectrum of low-lying excitations. Both theories are renormalizable. This suggests their possible equivalence.
NON-ABELIAN ANOMALOUS GAUGE THEORIES IN TWO DIMENSIONS AND CHIRAL BOSONIZATION
Authors: HARADA KOJI
Published: November 2004

We obtain a new bosonized action for a non-Abelian anomalous gauge theory in two dimensions as a gauged action of a chiral boson in a simple way. The model is quantized canonically.
INFLATION IN KALUZA-KLEIN COSMOLOGY I: TRANSFORMATION TO FOURTH-ORDER GRAVITY
Authors: SCHMIDT HANS-JÜRGEN
Published: November 2004

The higher-dimensional Einstein vacuum equation with Λ-term is shown to be conformally equivalent to the four-dimensional field equation of scale-invariant fourth-order gravity. This holds for a general warped product between space-time and internal space of arbitrary dimension m which turns out to be an Einstein space. (The limit m → ∞ makes sense!)

Thus, the results concerning the attractor property of the power-law inflationary solution derived for fourth-order gravity hold for the Kaluza-Klein model, too.
INVESTIGATION ON Y1−yCexBa2Cu3O7−y SUPERCONDUCTOR
Authors: Xianyu Z. , Li D.X. , Chen T.G , Li D.J. , Hong J.E. , He Y.F. , Li R.J. , Xiu Z.M. , Gao R.P. , Liu F. , Zhao Q.H. , Mao X.Y. , Sun W.
Published: November 2004

In this paper we report the effect of Ce content and heat treatment of magnetic field on the superconductivity of Y 1−y Ce x Ba 2 Cu 3 O 7−y system. When x≤0.7, it changes to superconductor with TcR=0>85K. When x=0.5, TcR=0=89.5K. The results of susceptibility show that in the course of superconductive transformation it follow the change paramagnetism→antiferromagnetism (misctmagnetism)→diamagnetism. X-ray structural analysis shows that at x=0.7 the major phase has hexagonal crystalline structure (a=14.906 Å, c=12.909Å), after magnetic field heat treatment the major phase changes to orthorhombic perovskite structure (a=3.822Å, b=3.887Å, c=11.693Å).
CDW AND SDW MEDIATED PAIRING INTERACTIONS
Authors: Bickers N.E. , Scalapino D.J. , Scalettar R.T.
Published: November 2004

Pairing near CDW and SDW metal-semiconductor transitions is analyzed for a 2-D lattice within an RPA approximation. We find that s-wave pairing can occur near the CDW transition provided the on-site U is not too large, while d-wave pairing occurs near an SDW transition.
Structural Inorganic Chemistry of High Temperature Ceramic Superconductors
Authors: Day P.
Published: November 2004

Correlations are drawn between the structures of the two series of ternary Cu oxide superconductors determined by high resolution powder neutron diffraction. Similarities and differences are emphasised, and comparison is made with other Group 11 compounds containing layers of corner linked square planar MX 4 units, such as Wells’ Salt (CsAuCl3) .
THE STATUS OF HIGH ENERGY SPECTROSCOPIC STUDIES OF HIGH Tc SUPERCONDUCTORS
Authors: FUGGLE J. C. , FINK J. , NÜCKER N.
Published: November 2004

A partial review of high energy spectroscopic studies of the new superconductors is given. We attempt to summarize the evidence on the ground state electronic configuration of these materials, the "valency" of Cu, the strength of elecrton-electron correlation, and the nature of the hole states which apparently lead to superconductivity.
X-RAY SPECTRA OF ORDERED AND DISORDERED BINARY COMPOUNDS
Authors: BOWEN MARSHALL A. , DOW JOHN D.
Published: November 2004

The X-ray photoemission, absorption, and emission spectra of a one-dimensional, one-orbital-per-site model of an ordered binary compound AB and its disordered counterparts A 1−x B 1−x B x A x are calculated. With increasing x, the band gap of this model changes from being large (insulating) to very small (semiconductive). Final-state interaction effects that produce electronic excitation of valence electrons across the gap are incorporated in a change-of-mean-field approximation. The spectra exhibit sidebands associated with disorder and distinctive features associated with the character of the one-electron states and excitonic states.
INVESTIGATION OF EXCITATION SPECTRA OF EXACTLY SOLVABLE MODELS USING INVERSION RELATIONS
Authors: KLÜMPER A.
Published: November 2004

We study the excitations of two-dimensional classical vertex models and related one-dimensional quantum Hamiltonians. The main mathematical means we use are functional equations which are set up and solved for the excitation functions. The method is first applied to the eight-vertex model as a prototype and compared with the traditional solution procedure of the Bethe Ansatz. In the last part we investigate some q-state models, notably the biquadratic spin-1 quantum antiferromagnet and its generalizations, which recently attracted interest due to Haldane’s conjecture.
THE CORNER TRANSFER MATRIX OF SOME FREE-FERMION SYSTEMS AND MEIXNER’S POLYNOMIALS
Authors: TRUONG T.T. , PESCHEL I.
Published: November 2004

Corner transfer matrices of some free-fermion vertex systems on a finite lattice, are exactly diagonalised in the Hamiltonian limit with the help of a special class of orthogonal polynomials: the Meixner polynomials. We present the derivation, discuss the asymptotic behavior for a large lattice and compare the results with numerical computation.
PREPARATION OF Ba2YCu3O7−x BY SPRAY DECOMPOSITION METHOD
Authors: SHIMAZU SHOGO , UEMATSU TAKAYOSHI , MATSUDA SATOSHI , KUWASAWA YOSHINORI
Published: November 2004

Ba 2 YCu 3 O 7−x (BYCO) was prepared by “Spray Decomposition (SPD) method” varying conditions and characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM), and electric conductivity measurements. SPD method gave a remarkably larger grain size of BYCO compared with the conventional grinding method. The major phase of the initial product from SPD was tetragonal and did not show superconductivity. After annealed at 1223 K, the major phase became orthorhombic with a=3.89Å, b=3.83 Å, and c=11.66Å. Tc(m) and ΔTc(10–90%) were 93.4 K and 1.4 K, respectively.
DISCUSSION ON THE MEAN FIELD APPROXIMATION IN THE RVB THEORY
Authors: TAO R.B. , HU X. , SUZUKI M.
Published: November 2004

Baskaran’s mean field approximation of the Hubbard Hamiltonian with strong correlation and half-filling is discussed. Our calculations show that his decoupling of the Hamiltonian is not permissible in the half-filling case and that it destroys the equivalence of the Hubbard model to the Heisenberg magnetic system and violates some spin-spin relations.
INTERGRANULAR FLUX TRAPPING EFFECTS IN YTTRIUM BARIUM CUPRATE SUPERCONDUCTORS
Authors: RUSSELL G.J. , MATTHEWS D.N. , TAYLOR K.N.R. , PERCZUK B.
Published: November 2004

Simultaneous measurements of the magnetic field dependence of the critical current density and the magnetization of yttrium barium cuprate superconductors have shown the presence of significant residual magnetic fluxes after the applied field has been reduced to zero. This trapped flux can be sufficient to leave the material in the mixed state and results in anomalous behavior of the observed electrical and magnetic properties. The flux appears to be associated with a magnetic field component threaded through the intergranular regions, whose motion is inhibited by circulating currents flowing in the granular system surrounding the field and preserved through the weak-link coupling. Once this coupling is destroyed, the field can move more freely. For a current-carrying sample in zero applied field, the Lorentz force due to the residual field causes the flux to leak from the sample, leading to the appearance of a voltage along the specimen.
HYDROGEN-HYDROGEN/DEUTERIUM-DEUTERIUM BONDING IN PALLADIUM AND THE SUPERCONDUCTING/ELECTROCHEMICAL PROPERTIES OF PdHx/PdDx
Authors: JOHNSON K.H. , CLOUGHERTY D.P.
Published: November 2004

A common quantum-chemical origin of superconductivity and anomalous electrochemical properties of hydrogen/deuterium in palladium is proposed, based on the presence of an interstitial “network” of delocalized H-H/D-D sσ-bonding molecular orbitals at the Fermi energy. Dynamic Jahn-Teller oscillations of the protons/deuterons (“optical phonons”) promote electron pairing and superconductivity at low temperature, while they could be a principal source of electrochemically induced heat from Pd electrodes. “Cold” nuclear fusion in Pd might also be promoted by such D-D oscillations, but at an extremely low rate and with insignificant heat production.
ULTRASONIC STUDY ON STRUCTURAL INSTABILITY OF Bi2Sr2Ca1Cu2O8 SINGLE CRYSTAL
Authors: WANG YE-NING , WU JIN , ZHU JIN-SONG , SHEN HUI-MIN , YAN YI-FENG , ZHAO ZHONG-XIAN
Published: November 2004

The velocity and attenuation versus temperature of ultrasonic longitudinal wave propagated along two directions in the c-plane at 10° to the a and b axes were measured for a Bi 2 Sr 2 Ca 1 Cu 2 O 8 single crystal. The anisotropic elasticity in the c-plane is manifested. One direction shows obvious softening minimum around 250 K, the other reveals only monotonic stiffening down to T c . The origin of the overall trend of elastic stiffening and some discrepancies appearing in the measurements for high T c materials are analyzed or clarified. Attenuation peaks at 95 K, 150 K, and 250 K are attributed to phase-like transition of the first order.
KINETICS OF OXYGEN EXCHANGE IN HIGH TEMPERATURE SUPERCONDUCTOR YBa2Cu3O6+x
Authors: STEPANOV A. A. , HAINOVSKY N. G. , PAVLYUKHIN Yu. T. , RYKOV A. I.
Published: November 2004

Kinetics of oxygen absorption in YBa 2 Cu 3 O 6+x has been described. Experiments were performed in the high pressure reactor with constant volume in the temperature range of 150–700°C and oxygen pressure 1.4–10.7 atm. Two stages of oxygen absorption in tetraphase have been discovered. The first is related to the formation of a solid solution of oxygen in Cu(I) layers with the activation energy 0.07 ± 0.01 eV . The second one is oxygen diffusion in the system of short disordered chains ( Cu − O )n with the activation energy 0.30 ± 0.01 eV . Growths of chains and their interaction during the second stage results in the formation of ortho-phase accompanied by further decrease of the reaction rate. Structure-chemical reasons for the multistage mechanism of oxygen absorption are discussed.
STM OBSERVATION OF GRATING SURFACES
Authors: OSHIO TAKANORI , SAKAI YOSHIYUKI , EHARA SHAW , TAKASHIMA KŌSHI
Published: November 2004

Three dimensional topographic images of optical grating surfaces have been obtained by the use of an STM. The STM can measure the grating surfaces in detail in air without touching the surfaces.

The shape of an STM image is deformed from that of the real surface in some respects due to the finite radius of curvature, R, of the pointed probe tip.

Reference figures, each of which shows the resultant STM shape of the image corresponding to a real surface having a certain set of values of blaze angle, θ, and apex angle, ϕ, have been prepared. With the aid of these figures, we could estimate, conversely, values of θ and ϕ, in addition to R of the tip used, from the STM image obtained. The possible ambiguities in the estimation were also discussed.

Thus, θ and ϕ values of gratings with line densities of 1,200 ~ 18,000 line/mm have been measured with errors of less than 10%.

This conducting method with the use of an STM and reference figures may be very effective in the inspection of surfaces fabricated by submicron machining in general.
PAIRING WITH FRACTIONAL ANGULAR MOMENTUM AND "SPINOR" GAP
Authors: KHVESHCHENKO D. V. , KOGAN Y. I.
Published: November 2004

We study a two-dimensional model where a multivalued superconducting order parameter arises. Flux quantization and the Josephson effect are discussed.
THE MAGNETIC PROPERTIES OF SINGLE-PHASE (Bi,Pb2)2Sr2Ca2Cu3Oy SUPERCONDUCTORS
Authors: MEI YU , GREEN S. M. , MANZI A. E. , LUO H. L. , POLITIS C.
Published: November 2004

Experimental results of shielding current and Meissner effects, magnetic flux-trapping and hysteresis loops of single-phase Bi 2−x Pb x Sr 2 Ca 2 Ca 3 O y (x = 0.2 and 0.4) superconductors are presented. At 5 K, the (Bi, Pb)–Sr–Ca–Cu–oxides display a highly irreversible behavior but at 30 and 77 K, the magnetization becomes more reversible in the high fields and the hysteresis is smaller in comparison with YBCO. For x = 0.4, the values of critical current density J c (H = 1500 Oe ) at 5 and 30 K are estimated by the critical model to be 8000 and 2300 A/cm 2, respectively. The value of J c (H = 250 Oe ) at 77 K is 400 A/cm 2. The low J c values indicates the weaker flux-pinning force in (Bi,Pb)–Sr–Ca–Cu–oxides than in YBCO. The value of the lower critical field H c1 (0) obtained from M(H) curves is 410 Oe for single-phase x = 0.2 material.