bluuebunny/crossref_metadata_2025 huggingface dataset:
NUCLEAR RESPONSE FUNCTIONS IN (e, e′p) REACTIONS
Authors: GANESAMURTHY K. , NATARAJAN R.K. , DEVANATHAN V.
Published: November 2004

Nuclear response functions in the exclusive 12 C (e, e′p)11 B reactions are studied in the nonrelativistic unfactorized approach. The off-shell and final state interaction effects with spin orbit coupling are investigated on the responses. The relative contribution of different ingredients of the current operator is studied on the nuclear response functions and the ratio RG.
DRIFT MOTION OF THE MAGNETIC MONOPOLE OF POLJAKOV-’t HOOFT IN THE AIR AND THE ‘BALL-LIGHTNING’ PHENOMENON
Authors: KORSHUNOV V.K.
Published: November 2004

By virtue of theoretical investigations of V. Rubakov on nucleons and nuclei decay with monopole-nucleon interaction, a qualitative analysis of the drift motion of the ‘mon’ in the air is conducted. The physical picture obtained coincided in detail with the descriptions of the ‘ball-lightning’, for which reason ‘ball-lightning’ is considered evidence for the magnetic monopole.
A GENERALIZATION OF GAUGE COUPLING CONSTANTS TO GAUGE COUPLING FIELDS
Authors: NIKOLOVA LORA , RIZOV V.A.
Published: November 2004

A natural generalization of the notion of the gauge coupling constant appearing in the covariant derivation operator is obtained by replacing it with a field Γ which takes values in the linear hermitian invertible mappings [Formula: see text] ([Formula: see text] is the Lie algebra of the gauge group G equipped with a G-invariant inner product). In this case the eigenvalues of Γ(x) for each point x from the space-time take the role of the usual single gauge coupling constant.
HAMILTONIAN BRST QUANTIZATION OF CHERN-SIMONS GAUGE THEORY
Authors: IGARASHI Y. , IMAI H. , KITAKADO S. , KUBO J. , SO H.
Published: November 2004

We quantize non-abelian gauge theory with only a Chern-Simons term in three dimensions by using the generalized Hamiltonian formalism of Batalin and Fradkin for irreducible first-and second-class constrained systems, and derive a covariant action for the theory which is invariant under the off-shell nilpotent BRST transformation. Some aspects of the theory, finiteness and supersymmetry are discussed.
QUATERNIONIC (ALIAS Sp(2)) COHERENT STATE AND HILBERT CONNECTION
Authors: KURATSUJI HIROSHI , TAKADA KENICHI
Published: November 2004

The Hilbert (or quantum) connection defined via the quaternionic (or Sp(2)) coherent state is studied by using coherent state path integral. This gives a non-integrable phase associated with the Yang-Mills gauge field induced on the compactified 4-dimensional Euclidean space S4(≃ P1(H) quaternionic projective space). The topological invariant is also discussed.
THE Z BOSON, THE TOP QUARK, AND NON-MINIMAL HIGGS BOSONS
Authors: HOLLIK W.
Published: November 2004

The impacts of a heavy top quark on the relation between the vector boson masses and the mixing angle at the Z peak, the on-resonance asymmetries, and the Z decay widths are reviewed in the minimal model and extensions within SU (2) × U (1). Of particular interest are models with two scalar doublets where the charged Higgs bosons can give a sizeable negative contribution to the partial width [Formula: see text] This enhancement of the Standard Model top effect can be used to separate models with charged Higgs bosons coupling to the (t, b) doublet from other classes of models affecting only the ρ-parameter. Precision measurements of the Z partial widths will provide significant constraints on the two doublet models if the top quark is very heavy.
MATRIX MODELS AND MARGINAL OPERATORS IN THE PLANAR LIMIT
Authors: CICUTA GIOVANNI M. , MONTALDI EMILIO
Published: November 2004

The role of monomials which are power of traces of matrices in matrix models with polynomial interaction potential is examined. Because of well-known factorization properties, the density of eigenvalues is trivially obtained in the planar limit by the saddle point method. Different susceptibilities have positive or negative critical coefficients.
INFINITE-DIMENSIONAL GENERALIZATIONS OF SIMPLE LIE ALGEBRAS
Authors: FRADKIN E. S. , YA. LINETSKY V.
Published: November 2004

Infinite-dimensional algebras associated with simple finite-dimensional Lie algebra g are considered. Higher-spin generalizations of sl(2) are studied in detail. Those of the Virasoro algebra are viewed as their "analytic continuations". Applications in higher-spin theory and in conformal QFT are discussed.
ON THE WAVEFUNCTION OF LIGHT PSEUDOSCALAR MESONS
Authors: MIRANSKY VLADIMIR A.
Published: November 2004

It is shown that electroweak interactions lead to a hard (decreasing at most logarithmically with increasing q2 at [Formula: see text]) part in the Bethe-Salpeter wave function of light pseudoscalars. However, this part is strongly suppressed by the factor [Formula: see text], where F EW ≃ 250 GeV and mc is a quark current mass. In pure QCD, the wavefunction decreases rapidly (as 1/q2) even at non-zero mc.
THE BOSONIC SIGMA MODEL ON A COMPACT SURFACE
Authors: LEBLANC M. , MADSEN P. , MANN R. B. , McKEON D. G. C.
Published: November 2004

A stereographic projection is used to map the bosonic nonlinear sigma model with torsion from two-dimensional Euclidean space onto a sphere-S2 embedded in three dimensions. The one-loop β-function of the torsionless σ-model is determined using operator regularization to handle ultraviolet divergences. Only by excluding the lowest eigenstate of the rotation operator on the sphere can the usual β-function be recovered; inclusion of this eigenstate leads to severe infrared divergences. Both the ultraviolet and infrared divergences can be regulated by working in n, rather than two, dimensions, in which case the contribution of the lowest mode cancels exactly against the contribution of all other modes, resulting in a vanishing β-function.
ON NULL STATES IN SUB-CRITICAL STRINGS
Authors: KIRITSIS ELIAS B.
Published: November 2004

It is shown that in a generic theory of sub-critical strings (or alternatively, two-dimensional gravity coupled to matter) the physical states are in one-to-one correspondence with the primary fields of the matter (critical) theory.
BRST-QUANTIZATION OF BOSONIC STRINGS AND HYPERTWISTORS
Authors: POPOV A. D.
Published: November 2004

We consider the relation between geometric quantization of bosonic strings and the Becchi-Rouet-Stora-Tyutin (BRST) approach. We introduce the space of hypertwistors as the total space of the bundle of complex structures over the phase space of bosonic string. The conditions of the BRST invariance, determining the Fock space of the bosonic string, have been formulated in terms of the ghost bundle over the hypertwistor space.
BJL DEFINITION OF DOUBLE COMMUTATORS AND THE JACOBI IDENTITY
Authors: BANERJEE R. , ROTHE H. J. , ROTHE K. D.
Published: November 2004

We show that there is a direct connection between the existence of an ambiguity in the BJL definition of a double commutator and the violation of the Jacobi identity.
SUPERSTRINGS AND QUANTUM GRAVITY
Authors: CHAPLINE GEORGE
Published: November 2004

It is suggested that the quantum geometry of asymptotically locally Euclidean spaces underlies the dynamics of superstrings moving on Calabi-Yau manifolds. In particular, it is pointed out that solving the Wheeler-DeWitt equation is akin to using a neural network to color maps on a Riemann surface. In the infrared limit such map colorings are formally equivalent to Calabi-Yau vacua for superstrings.
FAST PULSARS, STRANGE STARS: AN OPPORTUNITY IN RADIO ASTRONOMY
Authors: GLENDENNING NORMAN K.
Published: November 2004

The world's data on radio pulsars are not expected to represent the underlying pulsar population because of a search bias against detection of short periods, especially below 1 ms. Yet pulsars in increasing numbers with periods right down to this limit have been discovered, suggesting that there may be even shorter ones. If pulsars with periods below 1/2 ms were found, the conclusion that the confined hadronic phase of nucleons and nuclei is only metastable would be almost inescapable. The plausible ground state in that event is the deconfined phase of (3-flavor) strange-quark-matter. From the QCD energy scale this is as likely a ground state as the confined phase. We show that strange matter as the ground state is not ruled out by any known fact, and most especially not by the fact that the universe is in the confined phase.
ON SOME CONNECTIONS AND EXTENSIONS OF W-ALGEBRAS
Authors: SAVELIEV M. V.
Published: November 2004

In this note we briefly discuss the connections of W-algebras with the local characteristic integrals of the generalized Toda lattices, with the Poisson brackets of hydrodynamic type, as well as the supersymmetric extensions of these algebras and their generalizations associated with non-Abelian Toda systems.
LORENTZ TRANSFORMATION IN THE GREEN-SCHWARZ STRING QUANTIZED BY GHOST TRUNCATION
Authors: BELLUCCI STEFANO
Published: November 2004

We analyze the effective action of the Green-Schwarz heterotic σ-model. We also discuss the Lorentz transformation properties when the theory is quantized according to the Kallosh procedure of truncating the Batalin-Vilkovisky tower of ghosts.
TORSION BALANCE EQUIVALENCE PRINCIPLE EXPERIMENT FOR THE SPIN-POLARIZED Dy6F23
Authors: CHOU YI , NI WEI-TOU , WANG SHIH-LIANG
Published: November 2004

We use a torsion balance to perform an equivalence principle test on a magnetically shielded spin-polarized body of Dy 6 F 23. The equivalence of this polarized body compared with unpolarized aluminium-brass cylinders is good to (3.1 ± 4.0) × 10−8 in the solar gravitational field.
QCD MULTIPLICITY DISTRIBUTIONS IN e+e− ANNIHILATION
Authors: MALAZA E. D.
Published: November 2004

We present QCD predictions, including non-leading perturbative corrections of relative [Formula: see text], for the hadronic multiplicity distribution in e+e− annihilation final states. We obtain perturbative expansions whose convergence clearly points to a negative binomial. We anticipate the corrections of O(αs) to be important as the convergence is very slow due to the large [Formula: see text] corrections.
VORTICES AND MONOPOLES ON A SPHERE
Authors: OVRUT BURT A. , THOMAS STEVEN
Published: November 2004

The theory of a vortex-monopole Coulomb gas on a two-dimensional sphere is presented. We discuss the structure of Kosterlitz-Thouless phase transitions, construct the effective Lagrangian induced by vortices and monopoles, and exhibit a generalized form of vortex-monopole duality.
PARTON RECOMBINATION IN CLASSICAL CASCADE
Authors: BATUNIN A. V. , YUSHCHENKO O. P.
Published: November 2004

An equation for parton multiplicity in cascade with the recombination 1 → 2 ⊕ 2 → 1 is derived from a Kolmogorov-Chapman equation and solved. An evolution parameter τ of the cascade depends on the c.m. energy [Formula: see text]; an explicit form of the dependence is obtained from the condition that the mean multiplicity of charged particles in pp, [Formula: see text] collisions be reproduced. A considerable decrease in the mean multiplicity in heavy-ion collisions per pair of the colliding nucleons at high energies is predicted and compared to the parton cascade with no recombination.
REMARKS ON CHIRAL BOSONIZATION
Authors: BAZEIA D.
Published: November 2004

We use the first-order Lagrangian formalism of Faddeev and Jackiw to give some comments concerning chiral bosonization in the recent literature. In particular, after considering the fact that the Abelian formulation of Siegel's model reduces naturally to a gauged version of Floreanini and Jackiw's model, we introduce a method for understanding the bosonic description of the minimal chiral Schwinger model.
WHAT HAVE WE LEARNED FROM SN 1987A?
Authors: RAFFELT GEORG G.
Published: November 2004

We review the constraints on the properties of neutrinos, axions, majorons, light supersymmetric particles, and other constraints on fundamental physics that have been derived on the basis of the neutrino observations of SN 1987A.
COSET CONSTRUCTION OF SUPERSTRINGS VIA THE COADJOINT ORBIT METHOD
Authors: ARATYN H. , NISSIMOV E. , PACHEVA S.
Published: November 2004

The previously proposed general construction of geometric actions on infinite-dimensional group coadjoint orbits in terms of fundamental group one-cocycles is applied to provide an alternative formulation of the Green-Schwarz superstring. It is shown that the latter model can be consistently constructed as geometric action on a certain infinite-dimensional coset space of the semi-direct product of left- and right-handed Virasoro groups with a Kac-Moody group based on an appropriate modification of the super-Heisenberg-Weyl group.
CORRELATORS OF CONFORMAL FIELD THEORIES FROM THEIR CHARACTERS
Authors: MALIK R. P. , BEHERA N. , KAUL R. K.
Published: November 2004

All genus characters define a complete solution of a two-dimensional rational conformal field theory. An arbitrary point correlator can be obtained by an appropriate combination of the pinchings of zero-homology and non-zero-homology cycles of the characters on the higher genus Riemann surface.
ON COVARIANT QUANTIZATION OF MASSIVE SUPERPARTICLE WITH FIRST CLASS CONSTRAINTS
Authors: HUQ M.
Published: November 2004

We use the technique of Batalin and Fradkin to convert the second class fermionic constraints of the massive superparticle into first class constraints. Then the Batalin-Vilkovisky formalism is used to quantize covariantly the resulting theory. Appropriate gauge fixing conditions lead to a completely quadratic action. But the presence of Batalin-Fradkin decoupled components apparently removes the advantage gained from the conversion of second class constraints into first class constraints.
THREE-LOOP QCD CORRECTION TO THE CORRELATOR OF THE QUARK SCALAR CURRENTS AND Γtot(H0 → HADRONS)
Authors: GORISHNY S. G. , KATAEV A. L. , LARIN S. A. , SURGALADZE L. R.
Published: November 2004

Analytical results of a re-evaluation of the massless three-loop next-to-leading QCD correction to the correlator of the quark scalar currents and Γ tot (H0 → hadrons ) are presented. The states of some other QCD perturbative results is discussed.
COVARIANT ANOMALIES AND SCHWINGER TERMS IN ANOMALOUS GAUGE THEORIES
Authors: BANERJEE R.
Published: November 2004

The general relation connecting the divergence anomaly with the Schwinger terms in the commutator of Gauss law constraints is shown to be violated, in the algebraic approach, for the covariant anomaly. We discuss the origin of this violation and derive a modified relation valid for the covariant anomaly.
PARITY-VIOLATING ANOMALY FROM THE FOKKER-PLANCK EQUATION
Authors: NARDULLI G. , TEDESCO L.
Published: November 2004

We compute parity-violating anomaly in gauge theories with odd number of dimensions using an approach based on the effective Fokker-Planck equation in the stochastic quantization scheme. We find results that agree with those obtained by the Langevin equation.
A REFORMULATION OF QUANTUM MECHANICS
Authors: YOUSSEF SAUL
Published: November 2004

We show that the phenomena explained by quantum mechanics can alternatively be explained as a breakdown of probability theory without the need for wave-particle duality or the idea that a particle does not have a unique path in space. The single-particle Lagrangian consistent with the reformulated quantum mechanics is derived and specialized to the Schrödinger and Klein-Gordon theories. The usual paradoxes of quantum mechanics are explained. A connection to gravity is proposed. Probability theory is restored in the classical limit.
CAN THE COLOR FORCE BE USED TO ACHIEVE FUSION?
Authors: CHU SHU-YUAN , SHEN BENJAMIN C.
Published: November 2004

We explore the possibility that the color force can be used to overcome the Coulomb barrier in fusion, If there are small deviations from exact color neutrality, large separations of color may occur when two elements of opposite color defects are mixed non-uniformly. In order to restore color neutrality locally, the strong color force polarizes the nuclei and brings them close enough to fuse. If palladium and deuterium are such elements, it is possible that all the recent cold fusion results are but different manifestations of the above process.
POINCARÉ-INVARIANT DYNAMICS OF MASSLESS HIGHER SPINS—FOURTH-ORDER ANALYSIS ON MASS SHELL
Authors: METSAEV R.R.
Published: November 2004

The system of higher spins 0, 2, 4, … (every spin enters just once) is studied in the framework of the light-cone formalism at the level of the fourth-order approximation. It is shown that there exist definite values of the cubic interactions constants for which the Poincaré algebra remains closed on the mass shell. These values are expressed through the value of the one universal constant.
INTEGRABLE THEORIES AND NONLINEAR CONFORMAL TRANSFORMATIONS
Authors: GORSKY A.S. , SELIVANOV K.G.
Published: November 2004

Hierarchies of integrable theories arise naturally in the framework of nonlinear conformal transformations. The evolution equations may be interpreted either as one-parameter diffeomorphisms on Virasoro orbits or as transversal deformation of the orbits. Corresponding generators form a 2-loop algebra.
THE LORENTZ CHERN-SIMONS FORM IN HETEROTIC GREEN-SCHWARTZ SIGMA MODELS
Authors: HAAGENSEN PETER E.
Published: November 2004

By studying the 1-loop effective action of the heterotic Green-Schwartz sigma model, we identify the only source of anomaly in the target local Lorentz symmetry, and verify that it is canceled by the inclusion of a Lorentz Chern-Simons three-form in the definition of the supergravity field HABC.
VERTEX OPERATORS IN THE FRACTIONAL QUANTUM HALL EFFECT
Authors: FUBINI S. , LÜTKEN C.A.
Published: November 2004

A second quantized formalism for electrons confined to a plane in a strong perpendicular magnetic field is constructed using vertex operators. They are seen to arise naturally from a holomorphic representation of Laughlin’s first quantized wave functions, since they have the unique properties of creating coherent states, satisfying anyonic statistics and factorizing matrix elements. While open string vertex operators are sufficient for representing Laughlin’s “ground state” wave functions, it is shown that the vertex operators appearing in the theory of closed strings are needed in order to represent both types of anyonic excitations (quasi-holes and quasi-electrons) which appear in the theory of the fractional quantum Hall effect.
THE R→α′/R SPACE-TIME DUALITY FROM THE 2+1 POINT OF VIEW
Authors: KOGAN YAN I.
Published: November 2004

The duality between the large and small compactification radii in string theory (bosonic) is considered in the open topological membrane theory. The 2+1 analog of this R→α′/R duality is the duality between large and small scales in the corresponding topologically massive gauge theory with the spontaneous breaking of gauge invariance. This 2+1 duality is a consequence of the equivalence between the Chern-Simons theory with the mass term and the topologically massive gauge theory.
SINGLE q-OSCILLATOR MODE REALIZATION OF QUANTUM GROUP THROUGH CANONICAL BOSONIZATIONS OF SU(2)q AND q-OSCILLATORS
Authors: MALLICK B. BASU , KUNDU A.
Published: November 2004

Canonical action-angle type bosonizations of SU(2)q and q-oscillators found by us lead to a novel single q-oscillator mode realization of quantum group, representing a q-deformed Holstein-Primakoff transformation. The same canonical bosonizations help us to find a deforming map for q-oscillators, which in turn induces deforming functionals for centreless Virasoro algebra. Such bosonizations are also shown to play an important role in generating integrable field theories like sine-Gordon model.
PROTON DECAY AS A COSMIC STRING CONSTRAINT
Authors: MATHESON A.M.
Published: November 2004

In some cosmic string models the strings may give rise to baryon number violation. Constraints are derived on theories of this kind, from the measured limits on proton decay and the timing residual of the millisecond pulsar, by requiring that strings should not wash out the observed baryon-to-entropy ratio of the universe.
TACHYONIC HERMITIAN ONE-MATRIX MODELS
Authors: MATHIEU PIERRE , SÉNÉCHAL DAVID
Published: November 2004

We treat the hermitian one-matrix model in the case where the quadratic term of the matrix potential has a negative coefficient (negative mass). In that case two scaling functions are necessary in the continuum limit. We analyze the problem both in the spherical and the double scaling limits. We give the matrix potentials leading to the general multi-critical points, and find two sequences of critical behaviors, for potentials of degree 4m and 4m+2 respectively (m=1, 2, …). The two scaling functions satisfy coupled nonlinear differential equations. It is shown that the latter can be decoupled into equations of the KdV and the mKdV hierarchies. For potentials of degree 4m+2, the genus expansion of the specific heat coincides with that obtained in the positive mass case at degree 2m. For potentials of degree 4m, the genus expansion is different.
QUANTUM CORRECTIONS HELP EINSTEIN GRAVITY EXIT GRACIOUSLY
Authors: PÉREZ-MERCADER J.
Published: November 2004

We exploit the conformal equivalence between the 1-loop corrected Einstein gravity coupled to a scalar field, and linear Einstein gravity with an exponential potential, to show how the Graceful Exit Problem is solved in the context of this theory in a natural and simple way. What emerges is a scenario with a chaotic initial period followed by an era of old inflation. The resulting bubble nucleation rate is time-dependent in such a way that the second inflationary period, helped by the chaotic period, brings the Universe out of its inflationary era in a self-regulated and natural way.
REMARKS ON THE BRST QUANTIZED GAUGED WZNW MODELS AND THE TODA FIELD THEORIES
Authors: HAYASHI NOBUHARU
Published: November 2004

It is shown that the quantum Hamiltonian reduction proposed by Bershadsky and Ooguri enables us to connect the gauged WZNW models with fractional levels to the quantum Toda field theories, and the coupling constants of the Toda field theories with the fractional levels. The BRST framework is applied to the SL (n, ℝ)-WZNW models.
NON-PERTURBATTVE VACUUM FOR SUPERSTRING FIELD THEORY AND SUPERSYMMETRY BREAKING
Authors: AREF’EVA I. YA. , MEDVEDEV P.B. , ZUBAREV A.P.
Published: November 2004

We analyze possible ground states for the covariant string field theory action of the open NSR-superstring. A remarkable feature of this action is that it possesses a rich set of the auxiliary local fields. We found that some of low-lying scalar auxiliary fields acquire non-zero vacuum expectation values providing a new mechanism for supersymmetry breaking. The gauge vector field become massive while the physical spinor remains massless, thus the supersymmetry is broken in the non-perturbative vacuum.
OBSERVATIONS ON SUPERSYMMETRY BREAKING BY SCHERK-SCHWARZ MECHANISM
Authors: SENGUPTA SOUMITRA
Published: November 2004

We consider the 4-dimensional N=1 supergravity theory that emerges by generalized dimensional reduction of the d=10, N=1 supergravity coupled to E8⊗E8 super-Yang-Mills theory á la Scherk-Schwarz. It is shown that the Scherk-Schwarz mechanism leads to a spontaneously broken N=1, D=4 locally supersymmetric theory with vanishing cosmological constant only if some non-perturbative mechanism like gaugino condensation takes place in the hidden E8 sector.
DENSITY PERTURBATIONS AND RESONANT CONVERSION OF NEUTRINOS
Authors: KRASTEV P.I. , SMIRNOV A. YU.
Published: November 2004

The influence of local density perturbations on the resonant neutrino conversion is studied. General relations are established between the features of the perturbations and the changes in the conversion probabilities. In the extreme case of very fast changes of density in a thin layer, the problem is solved analytically. We consider the possibility of appearance or shift of local ρ-perturbations in the sun to induce appreciable variations of the solar neutrino signals, in particular in the Cl-Ar experiment.
GRAVITATIONAL BEAMSTRAHLUNG
Authors: CHEN PISIN
Published: November 2004

A semiclassical formalism of gravitational radiation from the collision of high energy e+e− beams is derived. The charged particles interact with the strong collective EM field of the oncoming beam and emit beamstrahlung. We show that these photons would couple to the same EM field and resonantly excite gravitational waves with much higher frequencies than those from astrophysical signals. We examine several physical examples and show that there is a finite probability for emitting such “gravitons”.
GLUINO INDUCED QUARK MASS MATRICES
Authors: MA ERNEST , MCILHANY KEVIN
Published: November 2004

We present a supersymmetric extension of the standard model where all quark masses and mixing angles except mt are derived as radiative effects induced by the gluino mass. We demonstrate in detail that our model fits well with present data on Vcb and Vub, etc.
BIDIMENSIONAL SUSY MODELS WITH POLYNOMIAL SUPERPOTENTIALS
Authors: BOYA L.J. , CASAHORRAN J.
Published: November 2004

We consider a family of bidimensional SUSY models. Although all of them exhibit unbroken supersymmetry, we show that the common mass of bosons and fermions depends on the bosonic or fermionic character of the vacuum the system chooses. We also discuss the existence of kink-like excitations using the SUSY extension of the Bogomol’nyi condition.
RADIATIVE CORRECTIONS AND UNITARITY BOUNDS ON THE HIGGS BOSON MASS
Authors: LENDVAI E. , PÓCSIK G. , TORMA T.
Published: November 2004

The influence of radiative corrections is examined as regards the relation between the unitarity bound on the standard model Higgs boson mass and the scale of new physics, Λ, where perturbative unitarity is violated. For a fixed Λ, radiative corrections increase the upper bound on the Higgs mass. The shift is about 270 GeV at Λ=1 TeV and 80 (40) GeV at Λ=2 (5) TeV .
LIOUVILLE REALIZATIONS OF W∞-ALGEBRAS
Authors: BELLUCCI STEFANO , IVANOV EVGENYI
Published: November 2004

We study the classical field-theoretical realizations of W-algebras in the system of two bosonic fields with the Liouville self-interaction. This system may be important for non-critical W-strings and W-gravity. The combined W∞+w∞ transformations which leave the action invariant are found and their group structure is analyzed. The invariance algebra involves Zamolodchikov’s W3-algebra as a nonlinear subalgebra.
NOVEL TOPOLOGICAL CONFORMAL ALGEBRAS
Authors: KAZAMA YOICHI
Published: November 2004

Algebraic characterization of 2-dimensional topological conformal field theories (TCFT’s) is proposed and some of its consequences are studied. In particular, we find two kinds of novel closed algebras, both of which are non-trivial extensions of the twisted version of the N=2 superconformal algebra. The larger of these algebras generically allows non-vanishing central charge c, a simple example of which is provided by a system with c=−2. The other algebra, on the other hand, requires vanishing central charge. An intriguing feature of this algebra is that it can be “untwisted” to yield a slight deformation of the N=2 algebra, which nevertheless possesses a hidden N=1 superconformal symmetry.
GROUND STATES UNDER GRAVITY AND BLACK HOLE EVAPORATION
Authors: FUKAZAWA KENJI
Published: November 2004

One may expect that the ground state of matter fields depends on the strength of gravity on account of the particle creation by the effect of gravity. In this letter we examine the argument of Hawking from this point of view by considering the shell model. We find that an observer at rest at spatial infinity can ‘see’ no radiation while an observer at rest near the horizon ‘sees’ Hawking radiation. Note that the latter thinks that the radiation is to be ‘seen’ at spatial infinity.
UNIVERSALITY OF THE MATRIX MODEL APPROACH TO TWO-DIMENSIONAL QUANTUM GRAVITY
Authors: ZEN FREDDY PERMANA
Published: November 2004

Universality with respect to triangulations is investigated in the Hermitian one-matrix model approach to 2-D quantum gravity for a potential containing both even and odd terms, [Formula: see text]. With the use of analytical and numerical calculations, I find that the universality holds and the model describes pure gravity, which leads in the double scaling limit to coupled equations of Painlevé type.
THE $\eta_c\to p\bar{p}$ DECAY AND A QUARK-DIQUARK MODEL OF THE NUCLEON: THE CONTRIBUTION OF SCALAR-VECTOR DIQUARK TRANSITION
Authors: ANSELMINO MAURO , CARUSO FRANCISCO , JOFFILY SÉRGIO , SOARES JOSÉ
Published: November 2004

The ηc decay into proton-antiproton cannot be explained by a lowest order perturbative QCD quark scheme. Trying to prove a previous result where diquarks were also considered as nucleon’s constituents, the contribution of the spin-flip transition between scalar and vector diquarks inside the nucleon is computed and is shown to be strictly zero. This result excludes the possibility of understanding why this decay is experimentally observed with a branching ratio much greater than those of other charmonium decays into the same final state, [Formula: see text], successfully described by pQCD in terms of quark and diquark components of the protons. A theoretical explanation of this decay rate is then still lacking and it is suggested that pseudoscalar glueballs might play an important role in solving the puzzle. The experimental results are also briefly discussed.
SUPPLEMENTING ANALYSIS OF DECONFINED PHASE IN LATTICE QCD THERMODYNAMICS
Authors: BOHAČIK J. , BORISENKO O.A. , PETROV V.K. , ZINOVJEV G.M.
Published: November 2004

Using strong coupling expansion an expectation value of matter field color density is calculated in the Hamiltonian formulation of lattice QCD at finite temperature with the staggered fermions. We found out that this value is related to the imaginary part of fundamental representation character changing the sign under the color charge conjugation. It is also shown that this expectation value could be used as an order parameter of the phase transition associated with the breaking of the color charge conjugation symmetry.
INTEGRABLE SYSTEMS AND DOUBLE-LOOP ALGEBRAS IN STRING THEORY
Authors: MOROZOV A.
Published: November 2004

Entire string theory in the formalism of first quantization cannot be exhausted by the theory of conformal models (CFTs). It is hardly enough to add only 2-dimensional integrable systems. However, examination of these systems may be of use for future guesses and generalizations. The first purpose is to give a unified treatment of all conformal and integrable models. Some steps in this direction are described in the context of Lagrangian approach. The main implication is the need to study 2-loop algebras (like those of fields on [Formula: see text] surfaces) and their quantum deformations.
COASTING KALUZA–KLEIN COSMOLOGY
Authors: AKDENIZ K. GEDIZ , ARIK METIN , MUTUŞ HAŞIM , RIZAOĞLU EMINE
Published: November 2004

Kaluza–Klein cosmologies where an early coasting universe followed by radiation dominance is naturally obtained as a consequence of the solution of the cosmological field equations are investigated. It is shown that such cosmologies are free of the horizon problem.
OF MARGINAL KINETIC TERMS AND ANOMALIES
Authors: HÜBSCH TRISTAN
Published: November 2004

Certain special kinetic terms in supersymmetric field theories lead to exactly marginal operators in the sense of renormalization flow. Such terms are shown to arise naturally in 2-dimensional σ-models describing 4-dimensional superstring compactification, but many other models can also contain them. They are closely related to chiral gauge and gravitational anomalies on one hand and Ricci-flatness on the other.
INDUCED SECOND CLASS CURRENTS IN τ DECAYS
Authors: DÍAZ-CRUZ J. L. , LÓPEZ CASTRO G.
Published: November 2004

We present a calculation of second class (SC) effects in τ decays induced by QCD corrections to the weak vertex [Formula: see text]. We find that the induced SC form factors behave like (md − mu)/q2 (q the momentum transfer, and mq the q-quark mass), which give branching ratios of O(10−6) and O(10−8) for the scalar and pseudotensor SC decays, respectively.
ISING MODEL SIMULATIONS ON THE MANIFOLDS OF TWO-DIMENSIONAL QUANTUM GRAVITY
Authors: AGISHTEIN M. E. , BAILLIE C. F.
Published: November 2004

The Ising model is stimulated on the manifolds of 2-dimensional quantum gravity, which are represented by fixed random triangulations (so-called quenched Ising model). Unlike the case of the Ising model on a dynamical random triangulation, there is no analytical prediction for the quenched case, since these manifolds do not have internal Hausdorff dimension and the problem cannot be formulated in matrix model language. The recursive sampling technique is used to generate the triangulations, lattice sizes being up to ten thousand triangles. The Metropolis algorithm was used for the spin update in order to obtain the initial estimation of the Curie point. After that we used the Wolff cluster algorithm in the critical region. We observed a second order phase transition, similar to that for the Ising model on a regular 2-dimensional lattice, and measured the critical exponents.
MEAN FREE PATHS OF He-FRAGMENTS PRODUCED DURING THE INTERACTION OF CARBON AND SILICON NUCLEI AT 4.5 AGeV/c
Authors: AHMAD TAUSEEF , IRFAN M. , AHSAN M. Z.
Published: November 2004

Interaction mean free paths of He-fragments produced by the collisions of carbon and silicon nuclei at 4.5 A GeV/c in nuclear emulsion for different distances from their production point have been investigated. We do not observe any anomalous effect in the mean free paths of He-fragments.
ON THE ISOSPIN BALLS
Authors: OHNO MASAYUKI
Published: November 2004

We have solved the equations of motion for isospin balls of Balachandran et al.1 numerically and have found their soliton solutions to be partly incorrect.
CLASSICAL SOLUTIONS OF 2-DIMENSIONAL STRING THEORY
Authors: MANDAL GAUTAM , SENGUPTA ANIRVAN M. , WADIA SPENTRA R.
Published: November 2004

We present an exact one-parameter family of solutions to the classical graviton-dilaton system in two dimensions. The solution can be identified as a black hole. We present the solution both in a Schwarzschild-like gauge and in the target space conformal gauge. We discuss possible relations with matrix models.
NEUTRAL HIGGS AND CP VIOLATION
Authors: JOSHIPURA ANJAN S.
Published: November 2004

An extended SU (2) × U (1) model with two-Higgs doublets and a discrete symmetry is considered. The latter is chosen to naturally obtain suppressed and hierarchical flavor-changing neutral currents induced by Higgs bosons. As a consequence, Higgs as light as 10 GeV is consistent with the observed KL – KS mass difference and problems with perturbative unitarity are avoided. In this model, the neutral Higgs can generate CP violation in K0 − K0 system and the consequences of a scheme where these exchanges provide the only source of CP violation are worked out.
BOUND STATES AND SCATTERING SOLUTIONS FOR 3D GRAVITY
Authors: MEISSNER KRZYSZTOF A.
Published: November 2004

We investigate the behavior of test particles in the presence of a massive source in 3-dimensional gravity. Bound states and scattering solutions are obtained both at the classical level and as solutons of the Schrödinger equation. The results depend crucially on whether the mass of the source is larger or smaller than the Planck mass and, in the quantum case, on the total angular momentum of the system.
A COULOMB GAS DESCRIPTION OF THE COLLECTIVE STATES FOR THE FRACTIONAL QUANTUM HALL EFFECT
Authors: CRISTOFANO G. , MAIELLA G. , MUSTO R. , NICODEMI F.
Published: November 2004

Many anyons wavefunctions relevant for the fractional Quantum Hall Effect at filling ν = 1/m are obtained by using Coulomb gas conformal Vertex operators. They provide irreducible representations of a subgroup of the magnetic translation group on the torus and their degeneracy is related to the allowed set of anyonic charges.
SOME DEVELOPMENTS IN POLYAKOV–KLEINERT STRING WITH EXTRINSIC CURVATURE STIFFNESS
Authors: GERMÁN G.
Published: November 2004

We survey some developments in the theory of strings with extrinsic curvature stiffness proposed by Polyakov and Kleinert. Particular attention is devoted to work on the static quark potential, the string tension at finite temperature and the thermal deconfinement properties of the model.
CURRENT DECOMPOSITIONS AND CURRENT ALGEBRA
Authors: LEE CHIEN-ER , TSENG BENJAMIN , YANG YEOU-WEI
Published: November 2004

Currents are decomposed into the sum of first- and second-class currents under the breaking of isospin symmetry. The above decompositions are then used to discuss the decay r → ηπντ and the current algebra.
AN INTERACTING GAUGE THEORY OF CHARGED PARTICLES AND STRINGS
Authors: ARIAS P. J. , GAMBINI R.
Published: November 2004

Using a standard procedure we obtain from the pure gauge theory of Nambu for 3-forms, two interaction theories between three antisymmetric gauge fields of different ranks. These theories are non-equivalent and describe the same dynamical system at the classical level. They could be interpreted as describing the interaction between charged and closed strings.
W∞ AND ANOMALIES OF SELF-DUAL EINSTEIN THEORIES
Authors: RODGERS V. G. J.
Published: November 2004

Recently it has been demonstrated that self-dual Einstein Euclidean instantons possess an infinite-dimensional group of symmetries which contain the standard w∞. Since w∞ has a central extension only in its w2 subalgebra one may claim that there is an anomaly in the symmetry group of these instantons which is described by a 3-dimensional w2 effective action. Thus one has a bosonization of the 3/2 spin anomaly of the Eguchi–Hanson instantons. In analogy to w∞ we construct the 3-dimensional effective action for the Lone Star W∞ algebra. This suggests that there is a quantum deformation of the instantons that contributes to the effective action of 4-dimensional self-dual gravity. We comment on this possibility.
CP-ODD PHENOMENA DUE TO FINITE WIDTH EFFECTS OF THE TOP QUARK
Authors: NOWAKOWSKI MAREK , PILAFTSIS APOSTOLOS
Published: November 2004

Strong experimental indications exist that the top quark mass in the Standard Model (SM) exceeds the mass of the W gauge boson. Since this opens the decay mode t → Wb a suitable regularization of the top quark propagator in the s-channel is required in many tree reactions. As in the Z0 case this regularization essentially results in an. additional imaginary contribution (iΓtmt) to the propagator. This absorptive phase can combine with complex coupling constants of the charged current sector to give rise to new CP violating effects. Theoretical upper bounds for the size of these CP-odd signals are estimated in various extensions of the SM such as: the four generation SM, left-right symmetric models and models with two or three Higgs doublets.
SIMPSON'S NEUTRINO AND THE SINGULAR SEE-SAW
Authors: ALLEN T. J. , JOHNSON R. , RANFONE S. , SCHECHTER J. , VALLE J. W. F.
Published: November 2004

We derive explicit forms for the neutrino and lepton "mixing-matrices" which describe the generic singular see-saw model. The dependence on the hierarchy parameter is contrasted with the non-singular case. Application is made to Simpson's 17 keV neutrino.
SUPERSYMMETRIC PARA BOSON-FERMION OSCILLATOR SYSTEMS AND THEIR SPECTRA
Authors: HAMA MITSURU , KOIKE ARATA , SAWAMURA MAKOTO , SUZUKI HARUO
Published: November 2004

Para boson-fermion supersymmetry is exemplified in simple oscillator systems. The parasupercharge satisfies the ordinary supersymmetry algebra. The parabosonic and parafermionic oscillators do not commute and the energy spectra are non-trivial for even the one level system. We calculate the partition functions and compare with those for the non-supersymmetric systems.
GAUGE PROPAGATOR CONTRIBUTION TO HIGH ENERGY BARYON NUMBER VIOLATION
Authors: ARNOLD PETER B. , MATTIS MICHAEL P.
Published: November 2004

The leading contribution of the gauge propagator to the inclusive baryon-number-violating cross-section in electroweak theory is calculated using the Levine–Yaffe propagator in the instanton background. The result resolves a current discrepancy between two calculational approaches to high energy baryon number violation, the "valley method" and the "R-term method".
ON THE COSMOLOGICAL CONSTANT AS A CONSTANT OF INTEGRATION
Authors: PETROV A. N.
Published: November 2004

The possibilities to construct a modification of General Relativity (MGR), where the cosmological constant appears as a constant of integration are considered. A class of new constraints on the metric is found, such that their inclusion in the Hilbert–Einstein action before its variation leads to MGR.
TOP AND HIGGS HUNTING VIA Mw AND Γz
Authors: HIOKI ZENRŌ
Published: November 2004

Virtual top and Higgs effects are studied through the electroweak radiative corrections to the W boson mass, MW, and the total decay-width of the Z boson, ΓZ, by using the data [Formula: see text], [Formula: see text] and [Formula: see text]. Carrying out the χ2 fit in the framework of the standard electroweak theory, constraints are derived on the top-quark mass, mt, and the Higgs–boson mass, mϕ, which are almost free from the complicated hadron physics like parton model calculations. For example, [Formula: see text] for mϕ = 100 GeV (at 1σ level) while mϕ ≲ 680 GeV if mt ≤ 110 GeV and mϕ ≳ 280 GeV if mt ≥ 190 GeV . It is also studied how precise measurements of MW at LEP II improve these constraints.
IDENTIFICATION OF GEPNER'S MODEL WITH TWISTED LG MODEL AND E6 SINGLETS
Authors: WANG XING-MIN
Published: November 2004

By identifying the chiral fields and related operators in Gepner's models and Vafa's twisted N = 2 Landau–Ginzburg models, we find that they also have the same E6 singlets spectra and therefore correspond to the same specific points of superstring vacua. We show explicitly how to identify generations, anti-generations and the E6 singlets in Vafa's class-A and E7 models with Gepner's models.
QUANTUM COSMOLOGY OF SUPERSTRING UNIVERSE
Authors: WANG JIN , MOHANTY SUBENDRA
Published: November 2004

We study the quantum cosmology of the string universe obtained by embedding the Robertson–Walker metric in the nonlinear σ-model.1 We find that the quantum model has some unusual features not seen in the classical model. Initially the universe exists in a series of metastable bound states with scale factor taking discrete values. Then the universe tunnels through a barrier and comes out in an inflationary state. This tunneling (or evolution in imaginary time) also has the effect of heating up the matter field so that we have the conditions of chaotic inflation. Our asymptotic solutions agree with those obtained from the classical Einstein equations in Ref. 1.
GENERALIZED BELINSKY–RUFFINI GEOMETRY
Authors: LEVINSON AMIR , DAVIDSON AHARON
Published: November 2004

Stationary, axially symmetric solutions of Einstein equations in a free 5-dimensional Kaluza–Klein space-time are derived. The electric charge and magnetic moment are generated by a fictitious boost involving the extra dimension. The associated gyromagnetic factor tends to unity at the ultra-relativistic limit. The solution derived interpolates between the Kerr and the Belinsky–Ruffini solutions.
SYMMETRY BREAKDOWN AND HIGHER-DIMENSIONAL MONOPOLES
Authors: DJEMAI A. E. F. , TAHIRI M.
Published: November 2004

In this work, we purpose to investigate the various topological conditions imposed on d-dimensional space-time, Grand Unification gauge group and on spontaneous symmetry breaking, which guarantee the existence of magnetic monopoles.
DIVERGENT SURFACE TERMS IN NON-COVARIANT GAUGES
Authors: MANN R. B. , RUDY T.
Published: November 2004

Using Leibbrandt's general prescription for regularizing (n · q)−1 poles in momentum intergrals in axial-type non-covariant gauges we show that the difference between two linearly divergent integrals which arise in such gauges yield a surface term which is logarithmically divergent. The form of divergence of this term is shown to be independent of the choice of non-covariant gauge. We show that such a term modifies the expression for the one-loop Yang–Mills self-energy evaluated using a cutoff scheme of adding to it a divergent part.
ON THE EVOLUTION OF QUASARS IN A STRING-DOMINATED UNIVERSE
Authors: AKDENIZ K. GEDIZ , ERBIL SEDA , MUTUŞ HAŞIM , RIZAOǦLU EMINE
Published: November 2004

We investigate Kolb's new cosmology to study the spatial evolution of quasars by means of the V/V max test, and we determine the best values and the acceptability ranges of the quasar evolutionary parameter which may predict the string loop density.
CORRELATION FUNCTIONS AND OPE IN TWO-DIMENSIONAL QUANTUM GRAVITY
Authors: TANII YOSHIAKI , YAMAGUCHI SHUN-ICHI
Published: November 2004

We compute a class of four-point correlation functions of physical operators on a sphere in the unitary minimal conformal field theories coupled to 2-dimensional gravity. We use the continuum Liouville field theory approach and they are obtained as integrals over the moduli (positions of the operators). We examine the integrands near the boundaries of the moduli space and compare their singular behaviors with the operator product expansion.
PERTURBED W3 CONFORMAL THEORIES AND SPIN-4/3 PARAFERMIONIC COSET MODELS
Authors: MANN R. B. , ZHENG H. B.
Published: November 2004

Renormalization group flows in W3, conformal theories are analyzed in relation to the ones in spin-4/3 parafermionic coset models and some of the operator content for new fixed points is identified.
ON THE SEMICLASSICAL INTERPRETATION OF AXIAL ANOMALY
Authors: TERYAEV OLEG V.
Published: November 2004

The explicit chiral symmetry breaking in the massive QED is shown to have a semiclassical analogue.
E8 LEVEL TWO RSOS MODEL
Authors: SERGEEV S. M.
Published: November 2004

We present E8 level = two Restricted Solid On Solid model.
CHIRAL QUANTUM BARYONS
Authors: DALARSSON NILS
Published: November 2004

We suggest a modified version of the quantum stabilization method for the usual SU(2) σ-model, proposed by Mignaco and Wulck, which avoids the difficulties with the usual soliton boundary conditions pointed out by Iwasaki and Ohyama. We investigate the baryon number n≥1 sector of the model and show that after the collective coordinate quantization it admits a stable soliton solution which depends on a single dimensional arbitrary constant. The results for static, rotational and total energies of the baryon number n≥1 sector chiral solitons are derived and analyzed.
COMPOSITE SPHALERONS IN THE O(3) NONLINEAR σ-MODEL
Authors: HUANG T. , ZHANG X.
Published: November 2004

It is shown that there are a series of composite solutions in the O(3) nonlinear σ-model. Their static energy is given by E(n)=nEsph and the energy density spreads out as n increases.
S-MATRIX APPROACH TO MASSLESS HIGHER SPINS THEORY II: THE CASE OF INTERNAL SYMMETRY
Authors: METSAEV R. R.
Published: November 2004

The system of higher massive spins s = 0, 1, 2,… (every spin lies in o(n)-matrix algebra) is studied in the framework of the light-cone formalism. It is shown that the conditions of closure of the Poincaré-Lorentz (PL) algebra for a four-legged diagram allow one to express all the cubic interaction constants in terms of some unique universal constant. We also shown that the systems in which even (odd) spins are realized as n × n (anti) symmetric matrices admit the consistent formulation. A complete list of four-legged vertices of the theory is given.
FUNDAMENTAL CHIRAL STRINGS
Authors: POPOV A. D.
Published: November 2004

The problem of the non-uniqueness of the string theory in the space Rd-1,1 with d ≤ 10 and the procedure of the compactification and the deompactification are discussed. We consider a compact bosonic string defined as a closed string moving in the Lorentizian torus T25,1 and introduce fundamental chiral bosonic string (FCBS) as a universal cover of a compact string. It is shown that the Fock spaces of any standard strings are embedded into the Fock space of FCBS.
ON THE EFFECTIVE ACTION IN FIELD THEORIES WITH DYNAMICAL SYMMETRY BREAKING
Authors: GUSYNIN V. P. , MIRANSKY V. A.
Published: November 2004

An approach to the low energy effective action based on the formalism of Green's functions of composite is developed in field theories with dynamical symmetry breaking. The effective action of the gauged Nambu-Jona-Lasinio model is derived as a series in powers of the derivatives of composite fields. The mechanism of scale symmetry breaking in this model is discussed.