bluuebunny/crossref_metadata_2025 huggingface dataset:
THE O(N) GROSS-NEVEU AND SUPERSYMMETRIC σ MODELS ON p-ADIC FIELDS
Authors: GRACEY J.A. , VERSTEGEN D.
Published: November 2004

We construct a fermion kinetic operator for fields over the p-adic number fields, Qp, and find p must be restricted to certain values to have correct fermion statistics. It is used to formulate the O(N) Gross-Neveu model and to consider the supersymmetric O(N)σ model on p-adic fields. We show that within the large N expansion they have the same vacuum structure as their real counterparts.
OBSERVABLE CONSEQUENCES OF THE STRONG COUPLING PHASE OF QED HYPOTHESIZED NEAR THE SURFACE OF LARGE-Z NUCLEI
Authors: INOUE M. , MUTA T. , SAITO J. , YU H.-L.
Published: November 2004

We discuss observable effects of the assumption that the strong coupling phase of quantum electrodynamics is realized in the surface region of heavy nuclei with large atomic number Z under a suitable external disturbance. We present some comments on anomalous peaks in electron-positron systems observed in heavy ion reactions and on effects expected in electron and positron scatterings off large-Z nuclei. We propose some experiments to test our assumption: (1) coincidence measurement of e+e− and γγ signals from the decays of large-Z nuclei, and (2) spectroscopy of large-Z muonic atoms.
SPONTANEOUS CHIRAL-SYMMETRY BREAKING AND SCALING LAW IN THREE-DIMENSIONAL QED
Authors: KONDO KEI-ICHI , NAKATANI HAJIME
Published: November 2004

We analyze the critical behavior associated with spontaneous breakdown of chiral symmetry in QED3 (three-dimensional QED with four-component Dirac fermion using the SD (Schwinger-Dyson) equation. In the quenched planar approximation, we find an approximate solution such that QED3 resides in only one phase where the chiral symmetry is broken. Moreover, we predict the scaling law for the dynamical mass and chiral order parameter by an analytic study of the SD equation, which is then confirmed by solving the SD equation numerically. This scaling law is consistent with the Monte Carlo result in the quenched approximation.
COVARIANT QUANTIZATION OF SPINNING SUPERPARTICLES
Authors: HUQ M.
Published: November 2004

We have applied the method of Batalin and Vilkovisky to obtain covariant quantization of massless spinning superparticles in D dimensions with M rigid target space and N local worldline supersymmetries. Appropriate gauge fixing has been introduced to obtain a quadratic gauge fixed action.
c=3d CONFORMAL ALGEBRA WITH EXTENDED SUPERSYMMETRY
Authors: ODAKE SATORU
Published: November 2004

We define a superconformal algebra with the central charge c=3d, which is the symmetry of the non-linear σ model on a complex d dimensional Calabi-Yau manifold. The c=3d algebra is an extended superconformal algebra obtained by adding the spectral flow generators to the N=2 superconformal algebra. We study the representation theory and show that its representations are invariant under the integer-shift spectral flow. We present the character formulas and their modular transformation properties. We also discuss the relation to the N=4 superconformal algebra.
MAGNUS FORCES AND STATISTICS IN 2 + 1 DIMENSIONS
Authors: DAVIS R. L.
Published: November 2004

Spinning vortex solutions to the abelian Higgs model, not Nielsen-Olesen solutions, are appropriate to a Ginzburg-Landau description of superconductivity. The main physical distinction is that spinning vortices experience the Magnus force while Nielsen-Olesen vortices do not. In 2 + 1 dimensional superconductivity without a Chern-Simons interaction, the effect of the Magnus force is equivalent to that of a background fictitious magnetic field. Moreover, the phase obtained an interchanging two quasi-particles is always path-dependent. When a Chern-Simons term is added there is an additional localized Magnus flux at the vortex. For point-like vortices, the Chern-Simons interaction can be seen as defining their intrinsic statistics, but in realistic cases of vortices with finite size in strong Magnus fields the quasi-particle statistics are not well-defined.
Z BRANCHING FRACTIONS AND THE TOP MASS
Authors: PECCEI R. D.
Published: November 2004

Recent data from LEP on the hadronic and leptonic branching fractions of the Z0 favors a narrow range for the top mass around 200 GeV. These results are consistent with other precision measurements sensitive to the electroweak radiative corrections.
TRIPLICITY OF HADRONS, QUARKS AND SUBQUARKS
Authors: TERAZAWA HIDEZUMI
Published: November 2004

Triplicity of hadrons, quarks and subquarks asserting that a certain physical quantity such as the weak current can be taken equally well as a composite operator of hadrons, or of quarks, or of subquarks is proposed. Among others, the weak mixing angle, the quark mixing matrix and the mass sum rules for quarks and leptons are revisited, reinterpreted and discussed in detail in triplicity.
RARE B-MESON DECAYS IN SU(2)L × SU(2)R × U(1) MODEL
Authors: ASATRIAN H. M. , IOANNISSIAN A. N.
Published: November 2004

Rare B-meson decays are investigated in the left–right symmetric models. The scalar particle contribution to the amplitude of the b → sγ decay is calculated. It is shown that this contribution can be essential even for scalar particle masses of about several TeV. The effects due to the left–right symmetry and scalar particles can be detected by measuring photon polarization in the decay B → K*γ.
INDEX THEOREM AND CHIRAL ANOMALY IN D = 4, N = 1 SUPERGRAVITY
Authors: YAJIMA SATOSHI
Published: November 2004

The chiral anomaly in D = 4 supergravity coupled to supersymmetric Yang-Mills theory is evaluated by using the path integral approach. We consider not only the minimal coupling between the gravitational and gauge fields and the fermion fields but also the interaction term which mixes the gravitino and gaugino. The explicit form of the new anomalous term is given by rewriting the resultant term obtained in flat space in a form corresponding to curved space.
PHASE STRUCTURE OF UNITARY MATRIX MODELS
Authors: MANDAL GAUTAM
Published: November 2004

We investigate unitary one-matrix models described by polynomial potentials. We find many different phases of these models at strong, weak and intermediate couplings characterized by multiple gaps in the spectral density. The one-gap phase is studied in detail and it shows multi-critical behavior with γ = −1/m. The multiple-phase structure may have implications for the phases of string theory.
S MATRIX PROOF OF CONSISTENCY CONDITION DERIVED FROM MIXED ANOMALY
Authors: BHANSALI VINEER
Published: November 2004

For a confining quantum field theory with conserved current J and stress tensor T, the  and  anomalies computed in terms of elementary quanta must be precisely equal to the same anomalies computed in terms of the exact physical spectrum if the conservation law corresponding to J is unbroken. These strongly constrain the allowed representations of the low energy spectrum. We present a proof of the latter consistency condition based on the proof by Coleman and Grossman of the former consistency condition.
NEW RESULTS IN THE ITEP/YePI DOUBLE BETA-DECAY EXPERIMENT WITH ENRICHED GERMANIUM DETECTORS
Authors: VASENKO A.A. , KIRPICHNIKOV I.V. , KUZNETSOV V.A. , STAROSTIN A.S. , DJANYAN A.G. , POGOSOV V.S. , SHACHYSISYAN S.P. , TAMANYAN A.G.
Published: November 2004

The search for double beta-decay of 76 Ge was carried out with a detector fabricated of enriched material (85% abundance of 76 Ge compared with 7.8% natural abundance). Measurements have been performed by the ITEP/YePI team in the Avan salt mine, 245 meters underground, situated in Yerevan, Armenia. Evidence for two-neutrino double beta-decay of 76 Ge with half-life of T1/2(2v)=(9±1) · 1020 y was obtained. New limits for neutrinoless double beta-decay, T1/2(0v)>1.3×1024 y, and double beta-decay with majoron emission T1/2(0v, B)>1×1022 y were obtained at 68% CL from mean background fluctuations. Limit for 0v-decay derived by the maximum likelihood method was T1/2>2.0×1024 y.
QUANTUM R-MATRIX IN THE RELATIVISTIC STRING MODEL IN A SPACE OF CONSTANT CURVATURE
Authors: FRADKIN E.S. , METSAEV R.R.
Published: November 2004

The relativistic closed string model arising in the geometrical approach is considered in a space of constant curvature. For this model the classical and quantum R-matrices are found.
GENERATING A HOT BIG BANG VIA A CHANGE IN TOPOLOGY
Authors: KANDRUP HENRY E. , MAZUR PAWEL O.
Published: November 2004

This letter uses ideas developed recently in semiclassical quantum gravity to argue that many qualitative features of the Hot Big Bang generally assumed in cosmology may be explained by the hypothesis that, interpreted semiclassically, the Universe “tunnelled into being” via a quantum fluctuation from a small (Planck-sized), topologically complex entity to a topolo-gically trivial entity (like a Friedmann Universe) that rapidly grew to a more macroscopic size.
ABSENCE OF P, T VIOLATION IN THE CHIRAL SPIN STATE OF THE HALF-FILLED HUBBARD MODEL
Authors: OTSU HIDEHARU , SATO TOSHIRO
Published: November 2004

The chiral spin state of the half-filled Hubbard model, taking into account the local SU(2) symmetry was studied. It is pointed out that there is a possibility that P, T invariances are not violated even in the chiral spin state due to the SU(2) symmetry, so that the Chern-Simons term cannot appear.
REAL-TIME FORMALISM OF THERMOFIELD DYNAMICS AND MATSUBARA APPROACH IN QUANTUM STATISTICAL PHYSICS
Authors: ABRIKOSOV A. A.
Published: November 2004

When studying thermodynamic properties by means of quantum field theory methods one can deform the Matsubara integration contour in the complex time plane. The deformations are restricted by Hamiltonian singularities which are due to turning on an interaction. One should construct the real-time technique in the true vacuum taking the interaction into account.
CHARGED LEPTON MASS SUM RULE FROM U(3)-FAMILY HIGGS POTENTIAL MODEL
Authors: KOIDE YOSHIO
Published: November 2004

It is pointed out that if we assume U(3)-family nonet Higgs scalars which couple to charged leptons bilinearly, a simple Higgs potential with a term which breaks the U(3)-family into SU(3)-family will lead to a mass sum rule, [Formula: see text]. This sum rule is in excellent agreement with experiment. The sum rule is also in good agreement with experiment when applied to the masses of down-quarks, d, s, and b.
STOCHASTIC CALCULUS AND COVARIANT AND ROTATION-INVARIANT LANGEVIN EQUATION FOR GRAVITY
Authors: MOCHIZUKI RIUJI
Published: November 2004

We investigate the relations among the Langevin equation, the Fokker-Planck equation, and the stochastic action, both in the sense of Ito and of Stratonovich. In the latter case we suggest a somewhat modified Langevin equation which is covariant and rotation-invariant.
ACAUSALITY IN COLOR DIELECTRIC MODELS
Authors: ZAHED ISMAIL
Published: November 2004

It is shown that color dielectric models may lead to acausal behavior in the gluon sector. A solution to this problem is suggested.
Is |Vcb| ≃ (mc/mt)1/2?
Authors: FREIRE E. M. , LAZARIDES G. , SHAFI Q.
Published: November 2004

The asymptotic relation |Vcb| ≃ (mc/mt)1/2 predicts a heavy top-quark and is realized in a class of grand unified SO(10) models. With 0.055 ≥ |Vcb| ≥ 0.040 and mc(mc) = 1.27 GeV , the top-quark is predicted to lie in the range [Formula: see text].
ZERO-POINT FLUCTUATIONS IN THE NUCLEAR BORN-OPPENHEIMER GROUND STATE
Authors: ZETTILI NOUREDINE
Published: November 2004

The small-amplitude oscillations of rigid nuclei around the equilibrium state are described by means of the nuclear Born-Oppenheimer (NBO) method. In this limit, the method is shown to give back the random phase approximation (RPA) equations of motion. The contribution of the zero-point fluctuations to the ground state are examined, and the NBO ground state energy derived is shown to be identical to the RPA ground state energy.
FLAVOR SU(2) SYMMETRY BREAKING IN DEEP INELASTIC SCATTERING
Authors: SIGNAL A. , SCHREIBER A.W. , THOMAS A.W.
Published: November 2004

Recently deep inelastic scattering experiments have implied that the ‘sea’ of the nucleon breaks flavor SU(2) symmetry. We examine the possible origins of this symmetry breaking in the Fermi statistics of the quarks and antiquarks in the sea and the requirements of chiral symmetry. We show that the present data have a natural explanation in terms of the long-range pion structure of the nucleon. Further work may lead to useful bounds on the parameters of bag models of the nucleon.
ANYONS AND GAUSSIAN CONFORMAL FIELD THEORIES
Authors: JATKAR DILEEP P. , RAO SUMATHI
Published: November 2004

We identify the spin of the anyons with the holomorphic dimension of the primary fields of a Gaussian conformal field theory. The angular momentum addition rules for anyons go over to the fusion rules for the primary fields and the r↔1/2r duality of the Gaussian CFT is reproduced by a charge-flux duality of the anyons. For a U(1) Chern-Simons theory with topological mass parameter k=2n, N-anyon states on the torus have 2n components, which correspond to the 2n conformal blocks of an N-point function in the Gaussian conformal field theory.
BEYOND PLANCK ENERGY TO NON-ARCHIMEDEAN GEOMETRY
Authors: AREF’EVA IRINA , FRAMPTON PAUL H.
Published: November 2004

A Lagrangian is proposed for interacting number fields such that below the Planck length p-adic fields and non-Archimedean geometry are relevant while at larger length scales the usual Riemannian geometry is applicable. Our motivation for the Lagrangian is based on the consideration of group properties in the previously-proposed primary quantization approach.
A VARIATIONAL APPROACH TO THE LIOUVILLE MODEL
Authors: ROY BARNANA , ROY PINAKI
Published: November 2004

We perform a variational analysis of the Liouville model. In particular we evaluate the effective potential and examine the possibility of restoring translation invariance.
BLACK HOLES IN A PERIODIC UNIVERSE
Authors: BOGOJEVIĆ A.R. , PERIVOLAROPOULOS L.
Published: November 2004

Schwarzschild-like black hole solutions corresponding to periodic universes are presented and analyzed. In the case of one compact dimension an analytic solution is given. An interesting structure of horizons-within-horizons is discovered when the size of the periodic coordinate is smaller than the Schwarzschild radius. A variational method is also introduced and applied to the case of all spatial coordinates being compact.
MULTI-INSTANTON SOLUTIONS IN EIGHT-DIMENSIONAL CURVED SPACE
Authors: DÜNDARER A. REŞIT
Published: November 2004

Starting from an SO(8)± Yang-Mills field Fab, a four-index antisymmetric, non-Abelian field Fabcd is defined. It is shown that this field satisfies a self-duality relation in eight-dimensional curved space and that its action integral is proportional to n, the winding number of the mapping from S8 onto S8 given by the octonionic transformation x→w=xn.
TOPOLOGICAL MASS GENERATION IN 3+1 DIMENSIONS
Authors: ALLEN THEODORE J. , BOWICK MARK J. , LAHIRI AMITABHA
Published: November 2004

The 4-dimensional theory of a 1-form Abelian gauge field A coupled to a 2-form (antisymmetric tensor) potential B is studied. The two gauge invariances of the theory admit a coupling mB ∧ F where F is the field strength (F=dA) of A. It is shown that this theory is a unitary, renormalizable theory of a massive spin-one field with no additional degrees of freedom. In this sense, it is a generalization to four dimensions of topological mechanisms in two dimensions (the Schwinger model) and three dimensions (Chern-Simons theory). The issue of spontaneous symmetry breaking is also examined.
GAUGE SYMMETRY BREAKING IN SUPERCONFORMAL ORBIFOLDS
Authors: GREENE B.R. , PLESSER M.R. , RUSJAN EDMOND , WANG XING-MIN
Published: November 2004

We study the construction of (2, 0) theories from orbifolds of N=2 minimal superconformal string compactifications with non-trivial Wilson loops. In particular, we exploit the connection between geometrical and exactly soluble string vacua to arrive at a mean of analyzing Calabi-Yau orbifolds containing ‘Wilson loops’ associated with non-free group actions, breaking the E6 gauge symmetry of the model as well the ‘shadow’ E8 gauge symmetry group. We apply our results to recently proposed three generation constructions of this sort and find spectra which differ from previous claims and which possess exceptionally desirable phenomenological properties.
QUANTUM GROUP GAUGE FIELDS
Authors: AREF’EVA I. YA. , VOLOVICH I.V.
Published: November 2004

Gauge fields models with quantum groups playing the role of gauge groups are discussed. An appropriate description of the quantum group SU q(2) is presented. The exponential map for this quantum group is constructed and it is shown that it can be parametrized by elements of quantum superplane. Some applications including quantum group chiral fields are briefly considered. In particular, a solution of the SU q(2) WZNW model is presented and an infinite number of conserved currents for the 2-dimensional quantum group chiral field is constructed.
A REMARK ON CONFORMAL FIELD THEORIES ON ALGEBRAIC CURVES
Authors: SOBCZYK J.
Published: November 2004

We present an argument supporting the conjecture that a conformal field theory (CFT) defined on a Riemann surface viewed as a branch covering of CP 1 can be transformed to a CFT on the complex plane in which the information about branching points was coded into certain conformal field insertions.
A QUANTUM-MECHANICAL ANOMALY RE-EXAMINED
Authors: BAZEIA D.
Published: November 2004

We explore some aspects of a quantum-mechanical anomaly. The formal steps mimic properties usually found in the description of self-dual fields in two dimensions. In particular, we introduce some comments on a recently suggested route to describe chiral bosons.
COVARIANT TWO-BODY BOUND STATE EQUATION
Authors: THAYYULLATHIL RAMESH BABU
Published: November 2004

We present a fully covariant equation for the bound state problem in field theory. As an example the bound state equation for positronium is analyzed and compared with the one-body Dirac equation. Difficulties with the covariant bound state equation with unequal masses are pointed out.
GRAVITATIONAL LENSING BY GLOBAL STRINGS
Authors: HINDMARSH MARK , WRAY ANDREW
Published: November 2004

We investigate the gravitational lensing properties of global cosmic strings. The relationship between the observed and actual angular positions of a source is found and this shows that under some, albeit rare, circumstances three magnified images of the source can be formed, unlike the local string which only produces two unmagnified images. Superconducting strings are shown to possess similar properties.
CRITICAL MODELS COUPLED TO TWO-DIMENSIONAL GRAVITY IN THE CONTINUUM
Authors: CAI YUNHAI , SIOPSIS GEORGE
Published: November 2004

We discuss minimal conformal field theories M(p,q) coupled to 2-dimensional gravity in the continuum. We find a transformation that enables us to relate all models with p=2 to each other. We identify the Fock space in each model and calculate correlation functions. We thus show that the k-th multi-critical matrix model corresponds to the non-unitary minimal model with q=2k−1.
WEYL AND GHOST NUMBER ANOMALIES IN THE POLYAKOV’S LIGHT-CONE GAUGE
Authors: SUZUKI HIROSHI
Published: November 2004

The conformal (Weyl) anomaly of the ghost-anti-ghost system in the 2-dimensional quantum gravity is calculated. A background covariant formalism allows us to treat the Polyakov’s light-cone gauge in a systematic way. The anomaly gives a contribution to the central charge, –28, which agrees with the result of Kniznik, Polyakov, and Zamolodchikov. The ghost number anomaly is also calculated, and the metric corrections to the naive ghost number current are given. It is suggested that a general scalar density in the light-cone gauge carries a screening ghost number.
ON THE QUANTUM CORRECTIONS TO TWO-DIMENSIONAL (1, 0)-SUPERSYMMETRIC ABELIAN GAUGE MODELS
Authors: ALMEIDA C. A. S. , KNEIPP M. A. C. , DE OLIVEIRA M. WERNECK
Published: November 2004

The machinery of (1, 0)-supergravity is employed to evaluate 1-loop corrections to the effective action and chiral symmetry supercurrent in the framework of an (1, 0)-supersymmetric Abelian gauge model. As a by-product, a dynamically-generated mass is found out for the gauge (1, 0)-superconnections.
NON-PERTURBATIVE RESTORATION OF DECOUPLING
Authors: KENNEDY D. C.
Published: November 2004

Radiative corrections due to heavy particles can be large in broken gauge theories, growing with their masses. However, simple arguments show that this is only a perturbative effect: the masses of such particles and thus their radiative effects are bounded by the stability and non-linearity of the theory.
COLLAPSE OF WORMHOLE SPACE AND THE BABY UNIVERSE PRODUCTION
Authors: TOMIMATSU AKIRA
Published: November 2004

We study the classical dynamics of a wormhole space in terms of the coarse grained physical topology. It is found that the gravitational collapse leads to the emission and the reabsorption of a baby universe whose topology is S1 × S2. This process proceeds smoothly in the 4-dimensional space-time.
THE FOCK–SCHWINGER GAUGE IN THE BFV FORMALISM
Authors: BARCELOS-NETO J. , GALVÃO CARLOS A. P. , GAETE P.
Published: November 2004

We consider the implementation of a properly modified form of the Fock–Schwinger gauge condition in a general non-Abelian gauge theory in the context of the BFV formalism. Arguments are presented to justify the necessity of modifying the original Fock–Schwinger condition. The free field propagator and the general Ward identity are also calculated.
COMMENT ON MASS GENERATION IN THE CHIRAL SCHWINGER MODEL
Authors: BERGER THILO
Published: November 2004

The mass generation mechanism for the gauge boson in the chiral Schwinger model is compared with one in the vector Schwinger model. They do not differ substantially, and we argue that an anomalous chiral gauge theory should be seen generally as a special low-energy version of a gauge invariant theory.
THE PENNER MATRIX MODEL AND c = 1 STRINGS
Authors: CHAUDHURI S. , DYKSTRA H. , LYKKEN J.
Published: November 2004

The steepest descent solution of the Penner matrix model has a one-cut eigenvalue support. Criticality results when the two branch points of this support coalesce. The support is then a closed contour in the complex eigenvalue plane. Simple generalizations of the Penner model have multi-cut solutions. For these models, the eigenvalue support at criticality is also a closed contour, but consisting of several cuts. We solve the simplest such model, which we call the KT model, in the double-scaling limit. Its free energy is a Legendre transform of the free energy of the c = 1 string compactified to the critical radius of the Kosterlitz–Thouless phase transition.
BRS ANALYSIS OF THE ENERGY MOMENTUM TENSOR IN TWO-DIMENSIONAL GRAVITY
Authors: L'YI W. S. , PARK YOUNG-JAI , KIM KEE YONG , KIM YONGDUK
Published: November 2004

Majorana fermion coupled to a 2-dimensional background gravitational field is investigated by employing the BRS quantization technique. Upon introduction of a quasicon-formal map ζ determined by the Beltrami differential h, the background gravitational field amazingly disappeared leaving just the free Majorana field ψ and ghosts b, c. In this way the vacuum expectation value of the energy-momentum tensor under the background gravitational field is explicitly computed.
CHIRAL LAGRANGIAN WITH VECTOR MESONS AND SOLITON ANSATZ TO THE SU(4) SKYRME MODEL
Authors: CHEUNG HAY YEUNG , GÜRSEY FEZA
Published: November 2004

We propose a chiral Lagrangian in which the pions and the vector mesons are treated on equal footing. It gives the usual meson physics and a mass relation for the mesons. We introduce a soliton ansatz for the SU(4) Skyrme model which approximates the more realistic covariant theory. Upon quantization, a rich mass spectrum for the soliton is obtained.
ON THE SCALAR CASIMIR ENERGIES IN SPACE-TIMES WITH Md × Tq STRUCTURE
Authors: CARUSO F. , NETO N. P. , SVAITER B. F. , SVAITER N. F.
Published: November 2004

The Casimir energy density of a scalar field quantized in a Md × Tq space-time is calculated. The field is supposed to satisfy Dirichlet and periodic boundary conditions in the (d − 1)- and q-dimensional submanifolds respectively. On account of this non-trivial topology, the sign of the Casimir energy is shown to have the same peculiar and entangled dependence on the number of finite sides of the hyperparallelopipedal cavity and on the space-time dimension, with only one exception which is discussed.
BRST QUANTIZATION OF GAUGE THEORIES ON THE HYPERSPHERE
Authors: McKEON D. G. C.
Published: November 2004

Drummond and Shore have shown that the most convenient gauge fixing term for gauge theories on a hypersphere is not a perfect square. We show how BRST quantization can be used to generate this gauge fixing term. This involves the introduction of two ghost fields, ci and [Formula: see text], the second of which is an anticommuting vector field. In the Abelian case, only the radial component of [Formula: see text] enters the effective Lagrangian; this is true in the non-Abelian case only if the gauge field is tangential to the hypersphere.
APPLICATION OF SEMICLASSICAL TECHNIQUES TO SINE–GORDON THEORY: RE-EXAMINED
Authors: JAIN PANKAJ
Published: November 2004

We show that the regularization prescription used by Dashen, Hasslacher and Neveu (DHN) to analyze the sine–Gordon theory violates Lorentz covariance in the one soliton sector. This problem is resolved by changing the regularization prescription. We use this new regularization to calculate the doublet masses, accurate to one-loop. We show that only the weak coupling expansion discussed by DHN gives reliable results. The alternate approximation, which was used by DHN to calculate the doublet masses in the sine–Gordon theory and which is known to give exact result for this case with the particular choice of the mass counterterm employed by them, is shown to be unreliable in general since the final result, even for the mass ratios, depends on the specific choice of the mass counterterm.
SPHERICALLY SYMMETRIC VACUUM SOLUTION IN ASHTEKAR'S FORMULATION OF GRAVITY
Authors: KAMIMURA KIYOSHI , MAKITA SHINOBU , FUKUYAMA TAKESHI
Published: November 2004

The Schwarzschild–de Sitter solution of Einstein equation is discussed in the Ashtekar formalism. The gauge connections have a similar form to those non-Abelian monopole solutions. In the de Sitter space we find a monopole at the North pole and an anti-monopole at the South pole of S3.
GRAVITATIONAL EFFECTS ON NEUTRINO OSCILLATIONS
Authors: WUDKA JOSÉ
Published: November 2004

The propagation of neutrinos in a strong gravitational field is determined within the WKB approximation. The result is used to study the modifications induced by gravity on the standard picture of neutrino oscillations. It is seen that, for sufficiently strong fields, the gravitationally induced left–right transitions are important, and will significantly modify the persistence probability for a neutrino to retain its original flavor and helicity. The inclusion of electromagnetic interactions is also briefly considered.
APPLICATION OF A NEW VARIATIONAL METHOD TO THE GROSS-NEVEU MODEL
Authors: YAMADA HIROFUMI
Published: November 2004

A new variational method proposed by Neveu is applied to the Gross-Neveu model. Chiral condensate is computed perturbatively at zero and finite temperature by the use of effective potential. At both temperatures the expected results in the mean field analysis, nonzero condensate at T=0 and restoration of γ5 symmetry at T≠0, are recovered in an efficient manner by calculating only a few lowest order diagrams.
CYCLIC EIGHT-STATE R-MATRIX RELATED TO Uq(sl(3)) ALGEBRA AT q2 = -1
Authors: KASHAEV R. M. , MANGAZEEV V. V. , STROGANOV YU. G.
Published: November 2004

Using an eight-state cyclic L-operator related to the Uq( sl (3)) algebra at q2 = -1 we have found an interwining eight-state R-matrix in the "trigonometric" limit. Corresponding commuting family of transfer matrices depends on three independent spectral parameters.
IMPLICATIONS OF A LARGE $Ht \bar{t}$-COUPLING FOR THREE-BODY DECAYS OF HIGGS BOSON AND TOP QUARK
Authors: DECKER R. , NOWAKOWSKI M. , PILAFTSIS A.
Published: November 2004

The three-body decays a heavy Higgs [Formula: see text], [Formula: see text] and of a heavy top t → bW+ H are studied in the context of the Standard Model. The common feature of these decay channels is the relative big coupling constant of the Higgs particle to the top quark. Indeed within a certain range of the masses M H , mt we find that branching ratios of the order O(10-3) are possible for the decays [Formula: see text] and t → bW+ H. The decay with [Formula: see text] as a function of M H and mt is investigated below the 2mt threshold (Mtt < 2mt) and is found to have an interesting behaviour just near this threshold.
ANOMALOUS MAGNETIC MOMENTUM IN 3D SPACE-TIME AND SELF-INTERACTING ANYONS
Authors: LATINKSY S. , SOROKIN D.
Published: November 2004

The statistical properties of matter fields with anomalous magnetic momentum interacting with the Chern-Simons-Maxwell (CSM) field are considered. It is shown that in the theory with pure Chern-Simons (CS) action the Semenoff gauge results in anyons with self-interaction. Even in the presence of the Maxwell term there is a particular solution for which the anyonic system with (current) x (current) self-interaction arises.
SEELEY-GILKEY COEFFICIENTS FOR SUPEROPERATORS
Authors: McKEON D. G. C.
Published: November 2004

Starting from a expansion of exp [-(A0 + A1)t] in powers of A1, we can obtain Seeley-Gilkey coefficients an(x,y) for  when H has dependency on both bosonic and fermionic variables. We consider operators of the form H = p2 + αL·p + p · αR + ϕ(p≡ - i∂) where, in general, αL ≠ αR. To illustrate how these can be used, we compute in closed form the coefficient a1(x,x) and from it the η-function in a three-dimensional model in which a spinor couples to an Abelian vector field with a topological action. The η-function turns out not to have the form of the classical action.
PHASE TRANSITION DUE TO NON-CONTRACTIBLE LOOP IN HETEROTIC STRING D<10
Authors: KATO NORIJI , SENDA IKUO
Published: November 2004

The heterotic string of the uncompactified dimensions less than ten, D<10, without space-time supersymmetry is considered. The states which have excitations only in the instanton sectors appear in the spectrum. These states become tachyonic below or above a certain scale of the compactified space and make the vacuum unstable. These phenomena are understood as phase transitions due to noncontractible loop on the compactified space. The investigation into the effective potential tells that the phase transition is of first order. The properties of the new phase are studied both in the field theoretic and the stringy manners. The heterotic string at finite temperature in D<10 is also discussed.
THE CURVED SHOCK WAVE SPACE-TIME OF ULTRARELATIVISTIC CHARGED PARTICLES AND THEIR SCATTERING
Authors: LOUSTÓ C.O. , SÁNCHEZ N.
Published: November 2004

We study the effect of the charge in the scattering of ultra high energetic particles. The ultrarelativistic limit of the boosted Reissner-Nordstrom geometry is found. This is a shock wave space-time in the limit when v→c and the mass and charge vanish as m=γ−1p and e=γ−1/2pe respectively, with p and pe being constants. (γ=(1−ν2)−1/2). The kinetic (p) and electromagnetic (pe) momenta of the particle contribute with different ρ-dependence [Formula: see text]. For pe=0, it gives the known Aichelburg-Sexl geometry. We find the exact S-matrix describing the scattering of a neutral massive test particle with this geometry, which generalizes the pe=0 result. This is an infinite superposition of the S-matrices for pe=0 and exhibits poles in both positive and negative axis Gs=im/2, (m∈Z). This increases the number of poles of the uncharged case by a factor of four. The large and small (s, t) behaviors are computed. The scattering in which the two particles are charged is highly complicated and not exactly solvable.
GAUGE INVARIANT STUDY OF THE STRONG COUPLING PHASE OF MASSLESS QUANTUM ELECTRODYNAMICS
Authors: UKITA M. , KOMACHIYA M. , FUKUDA R.
Published: November 2004

The strong coupling phase of massless Quantum Electrodynamics is studied in a gauge invariant way. The formalism is given in which the order parameter of the chiral symmetry breaking is calculated through the vacuum polarization diagrams. Applying this method, the critical coupling constant is shown to exist that is independent of the gauge parameter but is now dependent on the ratio of the two kinds of cutoff. Implication of this new parameter on the renormalization scheme in the strong coupling phase is discussed.
THE DOMINANT PART OF HIGHER ORDER CORRECTIONS IN PERTURBATIVE QCD
Authors: CONTOGOURIS A.P. , MEBARKI N. , PAPADOPOULOS S.
Published: November 2004

It is shown that in processes involving structure functions and/or fragmentation functions initiated by 2→2 parton subprocesses, there is a gauge invariant part that dominates higher order corrections over a sizeable kinematic domain. The gluon Bremsstrahlung contribution to this part arises from collinear and soft gluon configurations. This Bremsstrahlung contribution (and more generally the contribution to this part from 2→3 parton subprocesses) is shown to arise from expressions remarkably simple and general.
FLIPPED SU(6) FROM TEN DIMENSIONS
Authors: PANAGIOTAKOPOULOS C.
Published: November 2004

We study the compactification of the heterotic superstring on the only known three generation Calabi-Yau space with flux breakings leading to SU (6) × U (1) as the gauge group in four dimensions. We compute the 'massless' spectrum and identify the discrete symmetries of the internal space that survive flux breaking. The possible four-dimensional models are classified according to their honest discrete symmetries. The allowed breaking chains of SU (6) × U (1) are listed. Model building with SU (6) × U (1) is discussed in general and a concrete realistic model is constructed which does not suffer from the gauge hierarchy problem, fast proton decay or any other obvious phenomenological disaster. A distinct experimental signature of this class of models is the presence in the low energy spectrum of vector-like quarks and antiquarks, outside the three known families, with masses of the order of the supersymmetry breaking scale.
AN EFFECTIVE LAGRANGIAN CALCULATION OF THE SEMILEPTONIC DECAY MODES OF THE τ LEPTON
Authors: BRAATEN ERIC , OAKES ROBERT J. , TSE SZE-MAN
Published: November 2004

The semileptonic decay rates of the τ lepton into final states containing up to three pseudoscalar mesons are calculated using a general low energy effective Lagrangian for pseudoscalar and vector mesons with U (3)× U (3) chiral symmetry. Symmetry breaking is taken into account in the meson masses and mixing angles. All of the coupling constants in the Lagrangian are determined empirically from vector meson decay data without additional ad hoc hypotheses such as vector meson dominance. The results compare well with the measured decay rates where data are available. No unexpectedly large branching fractions are found that might account for the “missing” decay modes of the τ.
STRING THEORIES ON RIEMANN SURFACES OF ALGEBRAIC FUNCTIONS
Authors: FERRARI FRANCO
Published: November 2004

In this paper we extend to a general Riemann surface a formalism used so far for surfaces with Abelian group of symmetry. Using an algebraic equation F(z, w)=0 to define the surface in terms of sheets and branch points, it is possible to construct the correlation functions for b—c systems with integer conformal weight j and for the scalar fields X. Explicit examples are provided for a general surface of genus three and a surface of genus four. No essential complication arises with respect to the hyperelliptic case. At the end we discuss the computation of chiral determinants det [Formula: see text] using the stress energy tensor method.
N=2 SUPERMODULAR TRANSFORMATION ON SUPERTORUS
Authors: MYUNG Y.S
Published: November 2004

We discuss N=2, U(1) supermodular transformation on supertorus. For a special case when the U(1) parameter turns off, we obtain the supermodular transformation and we derive the Green function on supertorus. Further, we show that general supermodular transformation cannot be obtained from the Crane and Rabin approach. However, for the case of the U(1) parameter= pure soul, we obtain the general N=2 supermodular transformation.
LANDAU LEVELS: TRANSLATIONS AND ROTATIONS IN A CONSTANT ELECTROMAGNETIC FIELD
Authors: FUBINI S.
Published: November 2004

The spectrum of a charged particle in a constant magnetic field consists of equally-spaced Landau levels En = ℏω (n +½) which are infinitely degenerate. Using the magnetic group we show that this structure is present for any charged system which is rotation-translation invariant. The result is extended to the case of a constant electric field. The separation between baricentric and relative coordinates is discussed.
POLARIZATION IN THE PHOTODISINTEGRATION OF THE DEUTERON AND IN SPINWISE SIMILAR REACTIONS
Authors: GOLDSTEIN GARY R. , MORAVCSIK MICHAEL J.
Published: November 2004

The relationship of all observables to the reaction amplitudes is exhibited for the reaction γ+d→p+n, and thereby for all reactions of the γ+1→1/2+1/2 type. The pure transversitysystem is used, utilizing a recent formalism for the photon as a “pseudo-spin-1/2” particle in thetransversity frame. The relationship of the 144 linearly independent observables to the 144 bilinearproducts of the 12 reaction amplitudes appears in the form of 31 submatrices which are mostly 4-by-4 in size. The results therefore lend themselves readily to the planning of experiments andthe exploring of reaction dynamics. In particular, it is shown how the magnitudes of the amplitudes can be determined with relatively simple experiments, and how similar experiments canprovide information on the impact of the deuteron structure on this reaction.
A SUPERSPACE OF (1, 1/2)+(1/2, 1) FERMIONIC COORDINATES
Authors: PILOT CHRISTOPHER , RAJPOOT SUBHASH
Published: November 2004

A superspace is constructed in which the elements of the superspace consist of the four Minkowski space-time coordinates and a set of vector-spinor coordinates that belong to the irreducible (1, 1/2)+(1/2, 1) representation of the Lorentz group. It is shown that a translation in the vector-spinor coordinates leads to a vector-spinor coordinate dependent translation in the space-time coordinate xμ. The super covariant derivatives are also constructed.
SOME FUNDAMENTAL BUT ELEMENTARY FACTS ON RENORMALIZATION AND REGULARIZATION: A CRITICAL REVIEW OF THE EIGHTIES
Authors: BONNEAU GUY
Published: November 2004

The literature of the last ten years is riddled with papers confusing or "even erroneous because their authors forget some facts on regularization and renormalization which should be well-known. We thus propose a short critical review with emphasis on three points:

– to every primitive divergence corresponds a normalization condition, i.e. a parameter, even when a minimal scheme is used,

– a regularization needs a consistent set of rules,

– quantum corrections appear in the Ward identities when a symmetry non-preserving regulator is used, and they have to be compensated for through finite, non-symmetric counterterms. As a corollary, we recall that, being inconsistent, dimensional reduction should be prohibited when one wants to prove general results and, when used in "experimental" calculations, it should come with the necessary warnings.
THE COULOMB FORCE AND THE VARIOUS THERMODYNAMIC PHASES OF SIMPLE METALS
Authors: MATTIS DANIEL C.
Published: November 2004

With just two-body Coulomb interactions between electrons being taken into account, the phase diagram of a simple metal includes the following phases at least: the ordinary paramagnetic Fermi liquid, itinerant ferromagnetism, a charge-density wave phase and an antiferromagnetic phase (either of which can be insulating), and — surprisingly — a superconducting phase. The present work surveys the physics of the Coulomb interactions in metals, and the diverse roles played by the zero-range Hubbard interaction U0 and the long-range Coulomb interactions denoted ΔV (q). Screening of the latter by the currents in the metal is treated in some detail. This work is intended as an introduction into an important area of solid-state physics. A number of novel ideas are proposed, but are clearly identified as such. For example: although V (q) ≡ U0 + ∆V (q) is required to be positive at all q, υ(q) ≡ (1/2) U0 + ∆V (q) is not. We show that if υ (q) < 0 in a given phase, that phase is unstable (regardless of band structure, etc.). We also find that the Coulomb repulsion between electrons in a given band is somewhat stronger than that between holes. A companion paper based on the concepts presented here elaborates the theory of high-temperature superconductivity in layered metals.
STRUCTURE AND DYNAMICS OF SURFACES: INTRODUCTORY REMARKS
Authors: SCHOMMERS W.
Published: November 2004

The relevance of the structure and dynamics of surfaces is discussed by means of some typical examples: effect of relaxation on electronic surface properties, heterogeneous catalysis, kinetic oscillations, etc. In the discussion of experimental methods we have restricted ourselves to brief remarks on the most interesting scattering methods. Some of the theoretical problems are discussed which arise in connection with the determination of the structure and dynamics of surfaces. The molecular dynamics method is introduced, and results of molecular dynamics calculations for krypton surfaces are given in more detail.
KINETICS OF NEARLY DEGENERATE METASTABLE SYSTEMS WITH OHMIC DISSIPATION: THE NON-GAUSSIAN QUANTUM STATISTICAL PATH INTEGRAL
Authors: DEKKER H.
Published: November 2004

Using a generalized version of Langer's "imaginary part of the free energy" method the quantum decay rate Γ = A exp (−B) of a metastable ohmic oscillator — with harmonic frequency ω0 and quantum friction coefficient α — is studied for an almost symmetric barrier and a "free" exit space, involving an "inflection scattering" center. The unstable anomalous fluctuation mode (of the "breathing bounce" configuration in the partition function) is analytically continued in a fully "dynamical" manner. At zero friction and zero temperature the result for Γ agrees with the escape rate found from the pertinent Schrodinger equation by means of an extended WKB "outgoing waves" analysis. At slightly elevated temperatures — removing the earlier restrictions 12B exp (− ħω0/2k B T) → 0 and 2πk B T/ħω0 → 0 arising from the "two-state" and "sudden-flip" approximations — in the weak quantum damping regime (α ≲ 1) the decay rate shows a characteristic transition from quantal to thermal dependence on the bias energy ε. In the strong quantum damping regime (α ≳ 1) this dependence is always thermal while — in that case — at zero bias the oscillator becomes "dissipatively frozen" at zero temperature.
COMPETITION BETWEEN SUPERCONDUCTIVITY AND ANTIFERROMAGNETISM
Authors: NOWIK ISRAEL , FELNER ISRAEL
Published: November 2004

The competition between superconductivity and Cu antiferromagnetism in the high Tc, Cu containing superconductors, ( R 1−x M x)2 CuO 4, RBa 2 Cu 3 O 7, Bi 2 Sr 2 CaCu 2 O 8 and YBa 2 Cu 4O8 is reviewed. Partial substitution of some of the ions suppresses superconductivity and leads to the establishment of antiferromagnetic order in the Cu layers.
THE DISSIPATIVE DOUBLE-WELL POTENTIAL: A MULTILEVEL SPIN HOPPING ANALYSIS
Authors: DEKKER H.
Published: November 2004

A novel treatment is presented of the real-time dynamics of a quantum mechanical particle in a dissipative double-well potential at finite temperatures. The analysis is based on the bilinear coupling model Hamiltonian à la Zwanzig. The energy spectrum consists of a ladder of vibrational doublets. The usual truncation to the ground state doublet — à la Leggett et al. — is not required. The intra-doublet spin-boson dynamics is evaluated in the “noninteracting-blip approximation”. The inter-doublet vibrational relaxation gives rise to a stochastic hopping process.
PLASMONS IN GaAs/AlxGa1−xAs SUPERLATTICE STRUCTURE: A MODEL STUDY
Authors: SHARMA A.C.
Published: November 2004

We present analytic results for the effective interaction potential, plasmon dispersion relations and plasmon line shapes for the intrasubband plasmons in a modulation doped GaAs/Al x Ga 1−x As superlattice structure which contains two Al x Ga 1−x As layers of unequal widths per unit cell. Two intrasubband plasmon modes are found in the superlattice structure. One of the plasmon modes remains acoustic in nature while the other does not for all possible values of the wavevector.
ON THE SURFACE TENSION BEHAVIOUR NEAR THE CRITICAL TEMPERATURE
Authors: BARBERO G. , GABBASOVA Z. , MIRALDI E.
Published: November 2004

The surface tension near the critical temperature defining an order phase transition is theoretically analysed in the framework of a Landau theory. The considered medium is supposed to be characterized by a bulk order parameter different from zero below a critical temperature. It is shown that if the surface order parameter is different from the bulk one a non-monotonic trend of the surface tension versus the temperature is to be expected. This result agrees with published experimental data.
RUBIDIUM SUBSTITUTION IN "2212" BISMUTH SUPERCONDUCTORS
Authors: CHAICHIT N. , INTAWEE P. , LAKSANABOONSONG J. , SITTATRAKUL A. , TREECHAIRUSME K. , ENGKAGUL C. , LEELAPRUTE S. , TANG I. M.
Published: November 2004

It is found that rubidium Rb 1+ substitution into the "2212" bismuth superconductors, Bi 2( Sr 1−x Rb x)2 CaCu 2 O 8+y (x = 0.05, 0.1, 0.15, 0.2, and 0.3), produces changes in the copper valency which correlate with changes in the transition temperatures T c . By liquid nitrogen quenching pellets sintered at 800°C, nearly constant oxygen contents are obtained in all pellets fabricated. The c axis length is found to decrease with increasing Rb doping level.
JOSEPHSON JUNCTION USING A CROSSED CONTACT OF SUPERCONDUCTING Bi(Pb)-Sr-Ca-Cu-O THIN FILM WITH 110 K-PHASE
Authors: HIGO S. , IMAI M. , HAKURAKU Y. , KAWANO I. , OGUSHI T.
Published: November 2004

Bi 1.75 Pb 0.17 Sr 2 Ca 2.1 Cu 3.2 O y thin films with zero resistivity at 115 K, were prepared by dc magnetron sputtering and subsequent high-temperature annealing. Josephson bridges were fabricated by crossed contact of two cleaved planes of the thin films. Self-induced current steps and multi photon-assisted tunneling currents due to quasi-particles tunneling across the oxide gap barriers were observed. It was proved that the formation of the oxide gap barriers was due to oxidation of the Cu component and the extrication of Ca near the crossed contact of the thin film by soaking the thin film in liquid nitrogen. It seems possible to fabricate smaller bridge with a single junction by the use of thinner as-grown films with smoother surfaces.
1/f NOISE IN Y1Ba2Cu3O7−δ SINGLE CRYSTALS
Authors: SONG YI , MISRA ANUPAM , CROOKER P. P. , GAINES JAMES R.
Published: November 2004

1/f noise experiments performed on Y 1 Ba 2 Cu 3 O 7−δ single crystals indicate that (1) the normalized noise spectral density Sυ/V2 is much larger than that of metals; (2) the temperature dependence of Sυ/V2 differs from that of the resistivity; and (3) in the superconducting transition region, the behavior of 1/f noise is distinct from that observed in bulk and thin film copper oxide systems. Possible explanations for these observations including the important role played by the crystal morphology are discussed.
DIELECTRIC CONSTANT STUDIES OF INSULATING Y2BaCuO5
Authors: HUANG C. Y. , DRIES L. J.
Published: November 2004

We have measured the dielectric constant of Y 2 BaCuO 5 from 100 Hz to 20 GHz for temperature from 300 K down to 20 K. At room temperature and below 10 kHz, it varies strongly with frequency, but remains nearly constant at 3.7 from 10 kHz up to 20 GHz. It decreases with decreasing temperature from 300 K. Below 120 K, it saturates to 3.4, which is the lowest dielectric constant among the materials known to date except for some organic materials. The dissipation factor for our pure sample becomes less than the resolution limits of our apparatus for frequency from 1 MHz to 20 GHz.