bluuebunny/crossref_metadata_2025 huggingface dataset:
A LOOP-BASED SCHEDULING ALGORITHM FOR HARDWARE DESCRIPTION LANGUAGES
Authors: RAHMOUNI MAHER , O’BRIEN KEVIN , JERRAYA AHMED A.
Published: November 2004

This paper presents Dynamic Loop Scheduling (DLS), a loop-based algorithm that can efficiently schedule large, control-flow dominated designs. It compares favourably with results produced for traditional path-based approaches and at the same time requires much less overhead to implement. The high-performance of DLS is due mainly to the inclusion of loop feedback edges in the control-flow graph and the interruption of the path generation on the fly. The latter eliminates the generation of false paths thereby avoiding the path explosion problem.
COMPUTING ON RECONFIGURABLE BUSES—A NEW COMPUTATIONAL PARADIGM
Authors: LIN RONG , OLARIU STEPHAN , SCHWING JAMES L. , ZHANG JINGYUAN
Published: November 2004

Up to now, buses have been used exclusively to ferry data around. The contribution of this work is to show that buses can be used both as topological descriptors and as powerful computational devices. We illustrate the power of this paradigm by designing two fast algorithms for image segmentation and parallel visibility. Our algorithm for image segmentation uses a novel technique invol ving building a bus around every region of interest in the image. With a binary image pretiled in the natural way on a reconfigurable mesh of size N×N our segmentation algorithm runs in O( log N) time, improving by a factor of O( log N) over the state of the art. Next, we exhibit a very simple algorithm to solve the parallel visibility problem on an image of size N×N. Our algorithm runs in O( log N) time. The only previously-known algorithm for this problem runs in O( log N) time on a hypercube with N processors. To support these algorithms, a set of basic building blocks are developed which are of independent interest. These include solutions to the following problems on a bus on length N: (1) computing the prefix maxima of items stored by the processors on the bus, even if none of the processors knows its rank on the bus; (2) computing the rank of every processor on the bus; (3) electing a leader on a closed bus.
PERTURBATIVE APPROACH TO THE WHEELER-DEWITT EQUATION
Authors: ANADA HAJIME , KITAZOE TETSURO , MIZUMOTO YOSHIHIKO
Published: November 2004

A perturbation method is introduced to solve the Wheeler-DeWitt equation approximately. The chaotic inflationary model is used to demonstrate how the perturbative solutions approximate the numerical ones calculated with the aid of a computer.
MATRIX MODELS AND BLACK HOLES
Authors: DAS SUMIT R.
Published: November 2004

We show that an integral transform of the fluctuations of the collective field of the d=1 matrix model satisfy the same linearized equation as that of the massless “tachyon” in the black hole background of the two-dimensional critical string. This suggests that the d=1 matrix model may provide a non-perturbative description of black holes in two-dimensional string theory.
SU(3) STRUCTURE DEPENDENCE IN π→eνγ AND K→eνγ DECAYS
Authors: KARLSEN R.E. , SCADRON M.D. , BRAMON A.
Published: November 2004

We compute structure-dependent form factors for both π→eνγ and K→eνγ decays using the SU(3) linear σ-model. Meson loop contributions reduce the axial-vector form factor FA(0) by about 40% in both cases. The predicted ratio γ=FA(0)/FV(0) for π→eνγ and sum |FA(0)+FV(0)| for π→eνγ and K→eνγ decays are all in excellent agreement with data.
1/N EXPANSION AND PARTICLE SPECTRUM IN INDUCED QCD
Authors: MIGDAL A.A.
Published: November 2004

We study the 1/N expansion in the recently proposed model of the lattice gauge theory induced by heavy scalar field in adjoint representation. In the first approximation the fluctuations of the density of eigenvalues of the scalar field are Gaussian, so that the scalar glueball spectrum is defined from the corresponding linear wave equation.
SEMICLASSICAL BACKREACTION AND BERRY’S PHASE
Authors: DATTA D.P.
Published: November 2004

The semiclassical backreaction in a mini-superspace gravity-matter system is shown to be completely determined by Berry’s phase in an adiabatic limit. An interesting relationship between the Berry’s phase and the wormhole charge is also derived.
LARGE-N REDUCTION, MASTER FIELD AND LOOP EQUATIONS IN KAZAKOV-MIGDAL MODEL
Authors: MAKEENKO YU.
Published: November 2004

I study the large-N reduction á la Eguchi-Kawai in the Kazakov-Migdal lattice gauge model. I show that both quenching and twisting prescriptions lead to the coordinate-independent master field. I discuss properties of loop averages in reduced as well as unreduced models and demonstrate those coincide in the large mass expansion. I derive loop equations for the Kazakov-Migdal model at large-N and show they are reduced for the quadratic potential to a closed set of two equations. I find an exact strong coupling solution of these equations for any D and extend the result to a more general interacting potential.
TECHNIDILATON OR HIGGS?
Authors: HALYO EDI
Published: November 2004

Interactions of the technidilaton with fermions and gauge bosons are obtained by constructing a low energy effective Lagrangian and using the fact that the technidilaton couples to the trace of the energy-momentum tensor Θµµ. Technidilaton’s interactions are compared with those of the Higgs bosons of the Standard Model with one or two scalar doublets.
THE STRUCTURE OF 11Li: A “RYDBERG” NUCLEUS?
Authors: FREDERICO T. , HUSSEIN M.S.
Published: November 2004

The effective long range R−2 interaction between 9Li and the two neutrons (slightly bound) is taken here responsible for the loosely bound 11Li nucleus. A large number of these loosely bound Rydberg states is expected to be generated. Similarities to Efimov states are pointed out. It is pointed out that values of the orbital angular momentum of up to 3ħ may contribute to the structure of the ground state.
CHIRAL SYMMETRY BREAKING AND THE GLUON CONDENSATE
Authors: FABER M. , IVANOV A.N. , NAGY M. , TROITSKAYA N.I.
Published: November 2004

For the low-energy approximation of QCD, the extended Nambu-Jona-Lasinio model has been used. Quarks interact with an external homogeneous color-magnetic field, simulating the contribution of the gluon condensate. The value of the gluon condensate, needed to reach the correct value of the quark condensate, is determined and agrees well with the value obtained from QCD sum rules.
COVARIANT DIFFERENTIAL CALCULI ON QUANTUM SYMPLECTIC AND ORTHOGONAL PLANES
Authors: PARASHAR PREETI , BHASIN V.S. , SONI S.K.
Published: November 2004

We study covariant differential calculi on quantum symplectic and orthogonal planes as interesting examples of the Wess-Zumino formalism for general non-(anti-)commutative differential calculus on quantum planes. The aim of this exercise is to generate certain known R-matrix solutions of the quantum Yang-Baxter equation. This is achieved by treating the consistency conditions on the calculus in a manner different from that of Wess and Zumino.
A NOTE ON q-DEFORMATIONS AND SUPERSYMMETRIC QUANTUM MECHANICS
Authors: NDIMUBANDI J.
Published: November 2004

We point out a specific link between a recently proposed quantum deformation approach and supersymmetric quantum mechanics. In fact, we show that, under a certain q-dependence of the superpotentials, the proposed q-deformation gives rise to a standard Witten supersymmetric model. The context of a harmonic oscillator-like system is considered.
PSEUDOCLASSICAL MODEL OF SPINNING PARTICLE WITH ANOMALOUS MAGNETIC MOMENTUM
Authors: GITMAN D.M. , SAA A.V.
Published: November 2004

A generalization of the pseudoclassical action of a spinning particle in the presence of an anomalous magnetic momentum is given. The action is written in reparametrization and supergauge invariant form. The Dirac quantization, based on the Hamiltonian analyzes of the model, leads to the Dirac-Pauli equation for a particle with an anomalous magnetic momentum in an external electromagnetic field. Due to the structure of first class constraints in that case, the Dirac quantization demands for consistency to take into account an operator’s ordering problem.
ANALYSIS OF THE KW DISTRIBUTION USING A GENERALIZATION OF THE MEIJER’S G-FUNCTION
Authors: KRASZNOVSZKY S.
Published: November 2004

With the aid of the H-function of Fox we calculate the characteristic function of the Krasznovszky-Wagner(KW) distribution and the distributions of products, quotients and powers of independent KW-function variates. The KW distribution includes as special cases many of classical distributions, e.g., the exponential, the gamma, the chi-square the Weibull, as well as some others which appear in physics. Several examples in connection with statistics and KNO scaling are given.
THE COSMIC STRINGS GENERATED FROM THE TORSION
Authors: FUJISHIRO TAKEHIKO T. , HAYASHI MITSUO J. , TAKESHITA SHOJI
Published: November 2004

The cosmic strings can be described naturally by torsion formalism which has a direct analogy with dislocations in three-dimensional crystalline solid. We have obtained an exact solution in a four-dimensional model on M2×T2 and may be expected to describe a space-time structure of our universe. The relation between the mass per unit length and the deficit angle are different from that of the Einstein theory, but can be made consistent since our model could reproduce its prediction. We could also obtain the maximum value of the mass per unit length µ~10−6(~1022 g/cm ) by fine tuning of a parameter, which is consistent with the recent observations.
LANDAU LEVEL SPECTRUM FOR CHARGED PARTICLE IN A CLASS OF NON-UNIFORM MAGNETIC FIELDS
Authors: KHARE AVINASH , KUMAR C. NAGARAJA
Published: November 2004

The spectrum of a charged particle in uniform magnetic field consists of equally spaced Landau levels which are infinitely degenerate. We consider isospectral deformations of this problem and show that the spectrum is again equispaced but nondegenerate for a wide class of non-uniform magnetic fields.
DOES THE STRONG CP-PROBLEM REALLY EXIST?
Authors: TOKAREV V.F.
Published: November 2004

It is argued that the principle of absolute gauge invariance (which implies that the functional manifold of the gauge fields is a “circle,” where the integer-valued Chern-Simons numbers present the same point at the “circle”) provides a natural solution of the CP-problem. It is shown in simple mechanical models that the θ-term being a time derivative of some function does not change the quantum dynamics just as it does not change the classical one. In this context the two-dimensional electrodynamics is also considered.
SOME COSMOLOGICAL CONSEQUENCES OF A Λ-TERM VARYING AS βH2+αR−n
Authors: LIMA J.A.S. , MAIA J.M.F.
Published: November 2004

A new phenomenological decay law for the cosmological Λ-term is proposed and its influence on the universe evolution is investigated. Unlike the standard FRW model are the possibility of nonsingular solutions, recollapsing open universes and an everexpanding closed model. Explicit analytic solutions are given for the flat case both for parametric and cosmological times. In this case, models with the present density parameter Ω0 smaller than 2/3 and age bigger than [Formula: see text] can always be obtained. It is also shown that kinematic expressions as the luminosity distance and angular diameter versus redshift relation are significantly modified.
QUARK-PION COUPLING CONSTANT IN AN INDEPENDENT-QUARK MODEL WITH CHIRAL SYMMETRY
Authors: JENA S.N. , PANDA S.
Published: November 2004

Incorporating chiral symmetry into an independent-quark model with the confining potential Vq(r) = ½(1 + γ0)(a2r + V0), the quark-pion coupling constant for quarks in a nucleon are estimated. The values of [Formula: see text] obtained with the approximation of a point pion as well as finite size pion are consistent with that extracted from the experimental vector meson decay width ratio Γ(ρ → π+π0)/Γ(ρ → π- ν) by Suzuki and Bhaduri. The pion-nucleon coupling constant [Formula: see text] comes out to be 14.98 in good agreement with the experimental value.
NON-TOPOLOGICAL SOLITON SOLUTIONS FOR A DILATON TYPE POTENTIAL
Authors: MEENAKUMARI N. , RAJASEKARAN M.
Published: November 2004

We consider a scalar field Lagrangian with a self interaction potential which is similar in spirit to the dilaton field Lagrangian and we investigate the solitonic solutions of such a potential. The form of the potential and the parameter σ vac , are in good agreement with the values that would reproduce the lattice gauge results, rather accurately. Using this, the soliton bag solutions are obtained and the isolated hadronic properties are investigated. The calculated values of the dimensionless parameter gA/gV and the bag radius R are found to agree very well with the experimental values and the hadronic mass is found to be quite high.
ON ELASTIC VIBRATIONS OF HOMOGENEOUS STAR
Authors: BASTRUKOV SERGEY I.
Published: November 2004

The long wavelength vibrations of a homogeneous star are studied in the model of an incompressible self-gravitating elastic globe. The dynamics of stellar continuum is described in terms of macroscopic fields of the density, the mean velocity and the tensor of elastic strains. The frequency of normal elastic-gravitational vibrations is derived in analytical form.
GAUGE INDEPENDENCE OF THE FERMION DAMPING RATE IN A HOT PLASMA - LANDAU GAUGE VS COULOMB GAUGE
Authors: NAKKAGAWA H. , NIÉGAWA A. , PIRE B.
Published: November 2004

The damping rate of a heavy muon/quark in a hot QED/QCD plasma is calculated in the Landau gauge to the effective one-loop order in the resummed perturbation theory of Braaten and Pisarski. For both a muon/quark at rest and in an energetic case we obtain to leading order the same result as in the Coulomb gauge. Resummation of hard-thermal loop corrections to the photon/gluon propagator is of key importance for this gauge independence.
A NOVEL γWW VERTEX
Authors: LEMKE E.H.
Published: November 2004

We examine the hypothesis of a possible substructure of the electrically charged vector boson W±. Composing it of two Lorentz spinors, we find a vanishing electric quadrupole moment. Nevertheless and in contradiction to common belief, the reaction [Formula: see text] of the photoproduction of two longitudinally polarized W bosons does not violate the unitarity constraint at energies much larger than mW=80.1 GeV . Hence, no upper limit on the compositeness mass scale can result. This “good” high-energy behavior is due to a γWW interaction term containing an imaginary electric dipole moment.
A NOTE ON GENON AND PARASTATISTICS
Authors: DEBERGH N.
Published: November 2004

We superpose bosons and genons and relate this construction to parasupersymmetric developments. In particular, we show that trilinear parasuperalgebras and deformed bi linear algebras correspond to the same physical models relevant to spin [Formula: see text]-theories or to M-level systems (M≥2).
A GENERAL SOLUTION OF THE MASTER EQUATION FOR A CLASS OF FIRST ORDER SYSTEMS
Authors: DAYI ÖMER F.
Published: November 2004

Inspired by the formulation of the Batalin-Vilkovisky method of quantization in terms of “odd time,” we show that for a class of gauge theories which are first order in the derivatives, the kinetic term is bilinear in the fields, and the interaction part satisfies some properties, it is possible to give the solution of the master equation in a very simple way. To clarify the general procedure we discuss its application to Yang-Mills theory, massive (Abelian) theory in the Stueckelberg formalism, relativistic particle and to the self-interacting antisymmetric tensor field.
A COMPLETE HEAVY QUARK EFFECTIVE LAGRANGIAN FROM QCD
Authors: WU YUE-LIANG
Published: November 2004

We show how to construct a heavy quark effective Lagrangian which contains both ‘particle fields’ and ‘antiparticle fields’. This differs from the previous constructed heavy quark effective Lagrangian which includes only one of these fields. The Lorentz invariant of the full QCD theory trivially implies that of this effective Lagrangian without the need of summing over the velocity. This effective Lagrangian is reparametrization invariant for an arbitrary velocity. In particular our form of effective Lagrangian permits an expansion in powers of the heavy quark momenta characterizing its off-shellness divided by its mass.
GEOMETRY-INDUCED YANG-MILLS FIELDS IN CONSTRAINED QUANTUM MECHANICS
Authors: MARANER P. , DESTRI C.
Published: November 2004

We derive the effective Hamiltonian for a quantomechanical system constrained to move on a submanifold M of its configuration space Rn by a confining potential V. Besides potential terms proportional to the intrinsic and mean curvature of M the restriction to the constraint produce the minimal interaction with a geometry-induced Yang-Mills field.
RECENT RESULTS FROM CLEO
Authors: KROHA HUBERT
Published: November 2004

Recent results on B physics from the CLEO II experiment at the Cornell Electron Storage Ring are reviewed.
INHOMOGENEOUS STRING COSMOLOGY IN HIGHER DIMENSION
Authors: CHAKRABORTY SUBENOY , CHAKRABORTY ASHOK
Published: November 2004

String-dust system is considered in an inhomogeneous five-dimensional space-time. Solutions are obtained for three different equation of states for the string model and physical parameters are turn out to be functions of space and time coordinates. No string solution is possible for barotropic equation of state while for the other two equation of states string solutions are identical in form.
CONFORMAL MODELS OF TWO-DIMENSIONAL TURBULENCE
Authors: LOWE DAVID A.
Published: November 2004

Polyakov recently showed how to use conformal field theory to describe two-dimensional turbulence. Here we construct an infinite hierarchy of solutions, both for the constant enstrophy flux cascade, and the constant energy flux cascade. We conclude with some speculations concerning the stability and physical meaning of these solutions.
ON THE ORIGIN OF DENSITY FLUCTUATIONS IN THE UNIVERSE
Authors: POLLOCK M. D.
Published: November 2004

It has been shown by Harrison that quantum fluctuations of the metric at the Planck era lead to a scale-invariant spectrum of density fluctuations ξ ≡ δρ/ρ at all subsequent times of the expansion of a Friedmann universe, irrespective of whether there is inflation. For the vacuum Einstein theory, ξ is of order unity, and thus is too large. But for the dimensionally reduced, heterotic superstring, ξ ≈ πfα/M P ≈ 6 × 10−4, where M P is the Planck mass and fa ≈ 2 × 10−4M P is the axion decay constant. This result is in approximate agreement with the observations of the temperature fluctuations in the cosmic microwave background radiation by COBE, δT/T ≈ 6 × 10−6, and thus constitutes evidence in favor of the superstring theory.
THE CHIRAL BOSON THEORY AND EDGE STATES IN THE QUANTUM HALL EFFECT
Authors: MYUNG YUN SOO
Published: November 2004

We construct the wave functions for the edge states of a droplet of quantum Hall effect by performing the Gupta-Bleuler quantization of a chiral boson. These wave functions describe the chiral edge states of a many-electron system in the lowest Landau level. This demonstrates a crucial connection between the particle and condensed matter physics.
DISCRETIZATION OF THE SUPERPARTICLE PATH INTEGRAL
Authors: GRUNDBERG J. , LINDSTRÖM U. , NORDSTRÖM H.
Published: November 2004

We investigate the hitherto unexplored relation between the superparticle path integral and superfield theory. Requiring that the path integral has the global symmetries of the classical action and obeys the natural composition property of path integrals, and also that the discretized action has the correct naive continuum limit, we find a viable discretization of the (D = 3, N = 2) superparticle action.
DEMOCRATIC QUARK MASS MATRIX AS AN ORIGIN OF SYMMETRIC KM MATRIX
Authors: TANIMOTO MORIMITSU
Published: November 2004

The symmetric KM matrix is derived from the democratic quark mass matrix with the off-diagonal corrections. The obtained KM matrix is almost independent of the absolute value of the top-quark mass. The predicted CP violating phase ϕ is around 25º. Deviations from the symmetric limit are also studied quantitatively.
SELF-DUALITY AND THE SUPERSYMMETRIC KdV HIERARCHY
Authors: DAS ASHOK , GALVÃO C. A. P.
Published: November 2004

We show how the supersymmetric KdV equation can be obtained from the self-duality condition on Yang-Mills fields in four dimensions associated with the graded Lie algebra OSp(2/1). We also obtain the hierarchy of SUSY KdV equations as well as the s-KdV equations from such a condition. We formulate the SUSY KdV hierarchy as a vanishing curvature condition associated with the U(1) group and show how an Abelian self-duality condition in four dimensions can also lead to these equations.
ANOMALOUS NON-CONSERVATION OF FERMION QUANTUM NUMBERS IN COMPLEX BACKGROUND GAUGE FIELDS: (1 + 1)-DIMENSIONAL ABELIAN HIGGS MODEL
Authors: RUBAKOV V. A. , SEMIKOZ D. V.
Published: November 2004

Zero fermion modes are found explicitly for complex background gauge field configurations on contours in complex time plane relevant to multiparticle high energy scattering processes in (1 + 1)-dimensional Abelian Higgs model. Their number is determined by the topological number in accord with the triangle anomaly. The analog of the fermion level crossing is described. So, the analysis of the non-conservation of fermion quantum numbers is naturally generalized to complex background fields.
CORRELATION FUNCTIONS IN TWO-DIMENSIONAL DILATON GRAVITY
Authors: MATSUMURA YOICHIRO , SAKAI NORISUKE , TANII YOSHIAKI , UCHINO TAKU
Published: November 2004

The Liouville approach is applied to the quantum treatment of the dilaton gravity in two dimensions. The physical states are obtained from the BRST cohomology and correlation functions are computed up to three-point functions. For the N=0 case (i.e., without matter), the cosmological term operator is found to have the discrete momentum that plays a special role in the c=1 Liouville gravity. The correlation functions for arbitrary numbers of operators are found in the N=0 case, and have a non-vanishing bulk part only for specific “chirality” configurations.
THE SOLAR NEUTRINO PROBLEM WITHIN MSW THEORY
Authors: ESPOSITO S.
Published: November 2004

It is shown that the experiments on solar neutrinos can be accounted in terms of the Mikheyev-Smirnov-Wolfestein theory with ∆m2=6×10−6 eV 2 and sin 2 2θ=7×10−3. In the scenario proposed here the high energy neutrinos, from 8 B , have a survival probability around 1/3, the intermediate ones, around the 7 Be line a very small one ~ 2×10−3 and the low energy neutrinos, the ones coming from pp reactions, do not oscillate.
PHYSICAL STATES IN TWO-DIMENSIONAL TOPOLOGICAL GAUGE THEORIES
Authors: TANII YOSHIAKI , YAMASHITA MASAKAZU
Published: November 2004

Physical states of two-dimensional topological gauge theories are studied using the BRST formalism in the light-cone gauge. All physical states are obtained for the Abelian theory. An infinite number of physical states with different ghost numbers exist. Simple examples of physical states in a non-Abelian theory are also given.
WAVE PROPAGATION IN STRINGY BLACK HOLE
Authors: DHAR AVINASH , MANDAL GAUTAM , WADIA SPENTA R.
Published: November 2004

We further study the non-perturbative formulation of two-dimensional black holes. We find a nonlinear differential equation satisfied by the tachyon in the black hole background. We show that singularities in the tachyon field configurations are always associated with divergent semiclassical expansions and are absent in the exact theory. We also discuss how the Euclidean black hole emerges from an analytically continued fermion theory that corresponds to the right side up harmonic oscillator potential.
HIROTA BILINEAR FORM FOR THE SUPER-KdV HIERARCHY
Authors: MCARTHUR I.N. , YUNG C.M.
Published: November 2004

The integrability of the super-KdV hierarchy suggests that it can be written in Hirota bilinear form as the group orbit equation for some infinite-dimensional Lie algebra. We show how the first few equations in the hierarchy can be written in Hirota bilinear form. We also conjecture a bilinear expression for the whole super-KdV hierarchy and check it to reasonably high orders. A by-product is an expression for the ordinary KdV hierarchy which provides an alternative to the ones obtained by Date et al. and Kac and Wakimoto.
DIMENSIONAL REDUCTION AND THE NON-TRIVIALITY OF λϕ4 IN FOUR DIMENSIONS AT HIGH TEMPERATURE
Authors: O’CONNOR DENJOE , STEPHENS C.R. , FREIRE F.
Published: November 2004

λϕ4 theory in four dimensions is shown perturbatively to have a non-trivial fixed point at finite temperature, the relevant anomalous dimensions at the second order phase transition being the three-dimensional ones. We emphasize the importance of having renormalization schemes and a renormalization group equation that can explicitly take into account the fact that the degrees of freedom of a theory may be qualitatively different at different scales. By applying such considerations to finite temperature λϕ4 where the low temperature degrees of freedom are effectively four-dimensional and the high temperature ones three-dimensional we are able to follow perturbatively the theory from zero to infinite temperature.
SEMICLASSICAL ANALYSIS OF TWO- AND THREE-SPIN ANTIFERROMAGNETS AND ANYONS ON A SPHERE
Authors: SEN DIPTIMAN
Published: November 2004

We do a semiclassical analysis for two or three spins which are coupled antiferromagnetically to each other. The semiclassical wave functions transform correctly under permutations of the spins if one takes into account the Wess-Zumino term present in the path integral for spins. The Wess-Zumino term here is a total derivative which has no effect on the energy spectrum. The semiclassical problem is related to that of anyons moving on a sphere with the statistics parameter θ being 2πS for two spins and 3πS for three spins. Finally, we present a novel way of deriving the semiclassical wave functions from the spin wave functions.
AFFINE STRINGS
Authors: VOLOVICH I.V.
Published: November 2004

A new model of bosonic strings is considered. An action of the model is the sum of the standard string action and a term describing an interaction of a metric with a linear (affine) connection. The Lagrangian of this interaction is an arbitrary analytic function f(R) of the scalar curvature. This is a classically integrable model. The space of classical solutions of the theory consists of sectors with constant curvature. In each sector the equations of motion reduce to the standard string equations and to an additional constant curvature equation for the linear connection. A bifurcation in the space of all Lagrangians takes place. Quantization of the model is briefly discussed. In a quasiclassical approximation one gets the standard string model with a fluctuating cosmological constant. The Lagrangian f(R), like Morse function, governs transitions between manifolds with different topologies.
DILOGARITHM IDENTITIES IN CONFORMAL FIELD THEORY
Authors: NAHM W. , RECKNAGEL A. , TERHOEVEN M.
Published: November 2004

Dilogarithm identities for the central charges and conformal dimensions exist for at least large classes of rational conformally invariant quantum field theories in two dimensions. In many cases, proofs are not yet known but the numerical and structural evidence is convincing. In particular, close relations exist to fusion rules and partition identities. We describe some examples and ideas, and present conjectures useful for the classification of conformal theories. The mathematical structures seem to be dual to Thurston’s program for the classification of three-manifolds.
$B_d^0 \mbox{-} \bar{B}_d^0$ MIXING AND TOP QUARK MASS IN A FIELD THEORETIC QUARK MODEL
Authors: MAHARANA L. , NATH A. , PANDA A.R.
Published: November 2004

[Formula: see text] mixing is considered in the framework of standard model. Using the [Formula: see text] mixing parameter xd, the mass of the top quark is predicted in a field theoretic quark model. The prediction depends on the only free parameter of the model, i.e., the harmonic oscillator radius. However, once the charge radius of the [Formula: see text]-meson is measured, one can have a definite prediction for top quark mass.
THE GAUSS-BONNET IDENTITY IN FOURTH ORDER GRAVITY
Authors: BRUNINI S.A. , GOMES M.
Published: November 2004

For a class of conformally flat metrics a model based in fourth order gravity is constructed to investigate the existence of quantum corrections to the Gauss-Bonnet identity. If dimensional regularization is employed we prove that anomalies spoil the quantum validity of this topological identity.
TIME-DEPENDENT BOGOLIUBOV TRANSFORMATIONS AND THE DAMPED HARMONIC OSCILLATOR
Authors: SHANTA P. , CHATURVEDI S. , SRINIVASAN V. , MANCINI F.
Published: November 2004

We derive the master equation for a damped harmonic oscillator, for any α, using time-dependent Bogoliubov transformations of non-equilibrium thermofield dynamics. This investigation naturally leads us to a physically and mathematically meaningful parametrization of the Bogoliubov matrix.
MAGNETIC MONOPOLES, BOGOMOL’NYI BOUND AND SL(2, ℤ) INVARIANCE IN STRING THEORY
Authors: SEN ASHOKE
Published: November 2004

We show that in heterotic string theory compactified on a six-dimensional torus, the lower bound (Bogomol’nyi bound) on the dyon mass is invariant under the SL (2, ℤ) transformation that interchanges strong and weak coupling limits of the theory. Elementary string excitations are also shown to satisfy this lower bound. Finally, we identify specific monopole solutions that are related via the strong-weak coupling duality transformation to some of the elementary particles saturating the Bogomol’nyi bound, and these monopoles are shown to have the same mass and degeneracy of states as the corresponding elementary particles.
THEORY OF SELF-INTERACTING SCALAR FIELDS AND GRAVITATION
Authors: TALEBAOUI WATHEK
Published: November 2004

The theory of self-interacting scalar fields and gravitation is discussed using Robertson-Walker metric in conformal time. The theory is formulated in terms of a metric compatible connection with torsion. Analytic solutions are derived and in some cases we make explicit contact with the conventional Brans-Dicke theory.
ANSATZ FOR QUARK, CHARGED LEPTON, AND NEUTRINO MASSES IN SUSY GUTs
Authors: DREINER H. , LEONTARIS G.K. , TRACAS N.D.
Published: November 2004

We extend a fermion mass matrix ansatz by Giudice to include neutrino masses. The previous predictions are maintained. With two additional parameters, a large Majorana neutrino mass and a hierarchy factor, we have seven further low energy predictions: the masses of the neutrinos, the mixing angles and the phase in the leptonic sector. We choose a reasonable hierarchy of Majorana masses and fit the overall mass scale according to a solution of the solar neutrino problem via the MSW mechanism, which is in agreement with the 37 Cl , Kamiokande, SAGE and GALLEX data. We then also obtain a cosmologically interesting tau-neutrino mass.
THE ELECTRIC AND MAGNETIC FORM FACTORS OF THE NEUTRON
Authors: SCHLUMPF FELIX
Published: November 2004

We derive the electric and magnetic form factors of the neutron in the framework of a relativistic constituent quark model. Our parameter free prediction agrees well with a recent, accurate measurement. The relativistic features of the model and the specific form of the wave function are essential for the result. Comparisons are made to other models based on vector meson dominance, perturbative QCD and QCD sum rules.
DIFFEOMORPHISMS FROM HIGHER-DIMENSIONAL W-ALGEBRAS
Authors: MARTÍNEZ-MORÁS FERNANDO , MAS JAVIER , RAMOS EDUARDO
Published: November 2004

Classical W-algebras in higher dimensions have recently been constructed. In this letter we show that there is a finitely generated subalgebra which is isomorphic to the algebra of local diffeomorphisms in D dimensions. Moreover, there is a tower of infinitely many fields transforming under this subalgebra as symmetric tensorial one-densities. We also unravel a structure isomorphic to the Schouten symmetric bracket, providing a natural generalization of w∞ in higher dimensions.
ASYMPTOTIC RESTRICTIONS AND THE GENERALIZED SKYRME MODELS
Authors: ANDRIANOV V.A. , MANASHOV A.N.
Published: November 2004

The asymptotic restriction method is applied for researching the phenomenological Lagrangians of the generalized Skyrme model. It has been used on some equations on parameters of the models. The mass and coupling constants of scalar meson have been appreciated.
ELECTROMAGNETIC FORWARD NEUTRINO-NEUTRINO SCATTERING IN DENSE MATTER
Authors: HORVAT R.
Published: November 2004

Using covariant methods we calculate the coherent forward amplitude for the exchange of a virtual photon between neutrinos having medium-induced electromagnetic vertices. Such a process can affect the important Mikheyev-Smirnov-Wolfenstein (MSW) mechanism in media with large neutrino asymmetries. It can be considered as a finite temperature and density (FTD) version of a two-loop contribution which gives rise to non-universal (νι-dependent) radiative corrections to the forward scattering νν → νν. Assuming no inert neutrino species, we discuss the possible importance of this contribution to the MSW effect in a supernova core and in the early Universe with large but equal neutrino asymmetries.
POTENTIAL FLOW OF THE RENORMALIZATION GROUP IN A SIMPLE TWO-COMPONENT MODEL
Authors: DOLAN BRIAN P.
Published: November 2004

The renormalization group (RG) flow on the space of couplings of a simple model with two couplings is examined. The model considered is that of a single component scalar field with φ4 self interaction coupled, via Yukawa coupling, to a fermion in flat four-dimensional space. The RG flow on the two-dimensional space of couplings, [Formula: see text], is shown to be derivable from a potential to sixth order in the couplings, which requires two-loop calculations of the β-functions. The identification of a potential requires the introduction of a metric on [Formula: see text] and it is shown that the metric defined by Zamolodchikov, in terms of two-point correlation functions of composite operators, gives potential flow to this order.
VARIATIONS ON KALUZA-KLEIN COSMOLOGY
Authors: OSORIO M.A.R. , VÁZQUEZ-MOZO M.A.
Published: November 2004

We investigate the cosmological consequences of having quantum fields living in a space with compactified dimensions. We will show that the equation of state is not modified by topological effects and so the dynamics of the universe remains as it is in the infinite volume limit. On the contrary the thermal history of the universe depends on terms that are associated with non-trivial topology. In the conclusions we discuss some issues about the relationship between the c=1 non-critical string-inspired cosmology and the result obtained with matter given by a hot massless field in S1×ℝ.
PERTURBATION OF THE GROUND VARIETIES OF c=1 STRING THEORY
Authors: GHOSHAL DEBASHIS , LAKDAWALA PORUS , MUKHI SUNIL
Published: November 2004

We discuss the effect of perturbations on the ground rings of c=1 string theory at the various compactification radii defining the AN points of the moduli space. We argue that perturbations by plus-type moduli define ground varieties which are equivalent to the unperturbed ones under redefinitions of the coordinates and hence cannot smoothen the singularity. Perturbations by the minus-type moduli, on the other hand, lead to semi-universal deformations of the singular varieties that can smoothen the singularity under certain conditions. To first order, the cosmological perturbation by itself can remove the singularity only at the self-dual (A1) point.
INTERMITTENCY IN HADRON-NUCLEUS INTERACTIONS AT 200 GeV/c IN TERMS OF FACTORIAL CORRELATORS
Authors: GHOSH DIPAK , GHOSH ALOKANANDA , GHOSH PREMOMOY , KUNDU DEBAJIT , ROY JAYA
Published: November 2004

Factorial Correlators (FCs), a tool for the test of “intermittency” in multiparticle production in high energy physics, has not been given much attention, compared to the efforts towards understanding the phenomenon in terms of scaled factorial moments. So far, only hadron-hadron data of NA22 collaboration and nucleus-nucleus data of EMU01 collaboration have been analyzed in terms of FCs. However, the present situation of intermittency study demands thorough exploitation of all the available tools for better understanding of the phenomenon. In this article we present the analysis of particle production data of hadron-nucleus interaction at 200 GeV/c in terms of FCs. The results of the analysis show a consistency with the prediction of α-model for the existence of “intermittency.”
SELF-DUAL CHERN-SIMONS SOLITONS IN NONLINEAR σ-MODELS
Authors: MARTINA L. , PASHAEV O.K. , SOLIANI G.
Published: November 2004

A self-dual Chern-Simons system and its Lax pair are derived from the tangent space representation of a two-dimensional nonlinear σ-model, endowed with a gauge field. The related “matter” field density obeys the Liouville equation, whose N-soliton solutions correspond to the magnetic vortices in the static self-dual planar Heisenberg model. It is shown that the topological charge and the total vorticity correspond to the electric charge and the magnetic flux for the Chern-Simons system, respectively. General holomorphic solutions of the system studied generate a large class of static solutions to the Davey-Stewartson and Ishimori equations.
POLYNOMIALIZATION OF THE EINSTEIN-HILBERT ACTION
Authors: LEONOVICH A.A. , MLADENOV D.M.
Published: November 2004

In terms of variables ḡμv=(−g)k gμv where [Formula: see text] and n is the dimension of space-time, the Einstein-Hilbert action [Formula: see text] becomes polynomial. Gauge conditions ∂μḡμv=0 are proposed.
REALIZATION OF THE FADDEEVIAN REGULARIZATION IN AN ANOMALOUS GAUGE THEORY
Authors: KIM YONG-WAN , PARK YOUNG-JAI , KIM KEE YONG , KIM YONGDUK , KIM WON-TAE
Published: November 2004

We analyze the minimal chiral Schwinger model with the Wess-Zumino action in the Hamiltonian formulation and show that Mitra’s “Faddeevian regularization” originates in the matter gauge-fixed model in the case of a regularization ambiguity with a=2. Furthermore, we obtain the generalized model which satisfies the Faddeevian regularization for a≥1.
ANOMALY THROUGH GAUGE-INVARIANT REGULARIZATION WITH INFINITE NUMBER OF PAULI-VILLARS FIELDS
Authors: AOKI SINYA , KIKUKAWA YOSHIO
Published: November 2004

Abelian anomaly is examined by means of the recently proposed gauge-invariant regularization for SO(10) chiral gauge theory and its generalization for a theory of arbitrary gauge group with anomaly-free chiral fermion contents. For both cases it is shown that the anomaly with correct normalization can be obtained in a gauge-invariant form without any counterterms.
LARGE-N COLLECTIVE FIELD THEORY APPLIED TO ANYONS IN MAGNETIC FIELDS
Authors: HIRO-OKA HIDEAKI , MINAKATA HISAKAZU
Published: November 2004

We present a large-N collective field formalism for anyons in external magnetic fields interacting with an arbitrary two-body potential. We discuss how the Landau levels are reproduced in our framework. We apply it to the soluble model for anyons proposed by Girvin et al., and obtain the dispersion relation of the collective modes for arbitrary statistical parameters.
REPRESENTATIONS OF THE SN-EXTENDED HEISENBERG ALGEBRA AND RELATIONS BETWEEN KNIZHNIK-ZAMOLODCHIKOV EQUATIONS AND QUANTUM CALOGERO MODEL
Authors: BRINK LARS , VASILIEV MIKHAIL A.
Published: November 2004

We discuss lowest weight representations of the SN-extendedHeisenberg algebras underlying the N-body quantum-mechanical Calogero model. Our construction leads to flat derivatives interpolating between Knizhnik-Zamolodchikov and Dunkl derivatives. It is argued that based on these results one can establish new links between solutions of the Knizhnik-Zamolodchikov equations and wave functions of the Calogero model.
VIBRATIONAL ASPECTS OF THE SU(2) SKYRMION
Authors: STEFFENS F.M. , HERSCOVITZ V.E.
Published: November 2004

We treat the Skyrme model with the breathing mode in a situation involving two quartic terms. It is seen that there is a new limit for large e due to the breathing mode not found in the usual rotating hedgehog.
SOLUTIONS TO KNIZHNIK-ZAMOLODCHIKOV EQUATIONS WITH COEFFICIENTS IN NON-BOUNDED MODULES
Authors: IOHARA KENJI , MALIKOV FEODOR
Published: November 2004

We explicitly write down integral formulas for solutions to Knizhnik-Zamolodchikov equations with coefficients in non-bounded — neither highest nor lowest weight — [Formula: see text]-modules. The formulas are closely related to WZNW model at a rational level.
THE STRENGTH OF STRING NON-PERTURBATIVE EFFECTS AND STRONG-WEAK COUPLING DUALITY
Authors: COHN J.D. , PERIWAL VIPUL
Published: November 2004

A strong-weak coupling duality symmetry of the string equations of motion has been suggested in the literature. This symmetry implies that vacua occur in pairs. Since the coupling constant is a dynamical variable in string theory, tunneling solutions between strong and weak coupling vacua may exist. Such solutions would naturally lead to non-perturbative effects with anomalous coupling dependence. A highly simplified example is given.
OVERVIEW OF RARE AND FORBIDDEN CHARM DECAYS
Authors: SCHWARTZ A. J.
Published: November 2004

Rare and forbidden decays of charmed D mesons are discussed. An estimate is made of the sensitivity of BR (D → μ±e∓X) to higher mass generation-changing gauge bosons. A calculation is made of the rate for the second order weak decay c → ul+l−.
HEAVY ION EXCITATION OF GIANT RESONANCES: A BRIDGE FROM THE ELASTIC SCATTERING TO THE INELASTIC DATA
Authors: ALEIXO A. N. F. , BERTULANI C. A. , HUSSEIN M. S.
Published: November 2004

We develop data-to-data relations involving the giant-resonance cross-sections and the elastic cross-section for heavy ion collisions at intermediate energies. The usefulness of this novel method is shown by applications to the 17 O + 208 Pb at E Lab = 84 MeV/nucleon.
PROBABILITIES OF THE RARE ANNIHILATION REACTIONS $\bar pd\to \pi^- p$, ρ− p, ωn, ηn AT REST
Authors: KUDRYAVTSEV A. E. , TARASOV V. E.
Published: November 2004

Branching rations for the rare annihilation reactions [Formula: see text], ρ− p, ωn and ηn are calculated using two-step annihilation mechanism. Contributions from the intermediate π, ρ, ω and η are taken into account. The result of calculation for the reaction [Formula: see text] is W = (8.9 ± 1.0) × 10−6 (B1) which is in agreement with the recent OBELIX result. The leading contribution to this number arises from the virtial pion's exchange (≈89%).
A TEST OF THE EQUIVALENCE PRINCIPLE BY LONG-BASELINE NEUTRINO-OSCILLATION EXPERIMENTS
Authors: IIDA KAZUHITO , MINAKATA HISAKAZU , YASUDA OSAMU
Published: November 2004

We show that a breakdown of the universality of the gravitational couplings to different neutrino flavors can be tested in long-baseline neutrino-oscillation experiments. In particular we have analyzed in detail a proposed experiment at SOUDAN 2 with νμ beams from the Fermilab Main Injector. It turns out that we can study both masses of neutrinos and such a breakdown with sensitivity to the order of 10−14 by investigating the energy spectrum of the resulting muons.
MULTIPARTICLE PRODUCTION IN SILICON-EMULSION INTERACTIONS AT 4.5 A GeV/c
Authors: AHMAD TAUSEEF , ABDUSALAM NASR MUSTAFA , IRFAN M.
Published: November 2004

We present and discuss results on multiplicity and angular distributions of shower particles produced in silicon-emulsion interactions at 4.5 A GeV/c. These results are compared with those obtained for different values of impact parameter. Shower width distribution has also been investigated.
GEOMETRY AND PHYSICS ON w∞ ORBITS
Authors: SELIVANOV K. G.
Published: November 2004

We apply the coadjoint orbit technique to the group of area preserving diffeomorphisms (APD) of a 2D manifold, particularly to the APD of the semi-infinite cylinder which is identified with w∞. The geometrical action obtained is relevant to both w gravity and 2D turbulence. For the latter we describe the Hamiltonian, which appears to be given by the Schwinger mass term, and discuss some possible developments within our approach. Next we show that the set of highest weight orbits of w∞ splits into subsets, each of which consists of highest weight orbits of wN for a given N. We specify the general APD geometric action to an orbit of wN and describe an appropriate set of observables, thus getting an action and observables for wN gravity. We compute also the Ricci form on the wN orbits, what gives us the critical central charge of the wN string, which appears to be the same as the one of the WN string.
THE N = 3 SUPERSYMMETRIC KdV HIERARCHY
Authors: YUNG C. M.
Published: November 2004

An N = 3 supersymmetric extension of the KdV equation, whose Hamiltonian structure is the classical O(3)-extended superconformal algebra is presented. Integrability of the equation is argued based on the existence of a non-trivial conservation law which reduces to the first non-trivial conservation law of the KdV equation.
NON-PERTURBATIVE SOLUTION OF THE SUPER-VIRASORO CONSTRAINTS
Authors: BECKER K. , BECKER M.
Published: November 2004

We present the solution of the discrete super-Virasoro constraints to all orders of the genus expansion. Integrating over the fermionic variables we get a representation of the partition function in terms of the one-matrix model. We also obtain the non-perturbative solution of the super-Virasoro constraints in the double scaling limit but do not find agreement between our flows and the known supersymmetric extensions of KdV.
AN IMPROVED METROPOLIS ALGORITHM FOR THE SIMULATION OF RANDOM SURFACES
Authors: HARRIS M. G. , WHEATER J. F.
Published: November 2004

For a random surface with extrinsic curvature the performance of a Metropolis simulation near the critical point can be improved by modifying the algorithm. The errors for various quantities can be reduced slightly whilst at the same time achieving a reduction in CPU time of order 30%.
CAN NUCLEON-NUCLEON BREMSSTRAHLUNG SHED MORE LIGHT ON NARROW DI-NUCLEON STRUCTURES?
Authors: GERASIMOV S.B. , KHRYKIN A.S.
Published: November 2004

The possibility of using the bremsstrahlung reaction in proton-proton interactions as a new tool for searching and investigating the narrow, exotic 6-quark(di-nucleon) resonances is suggested and discussed.
SOME REMARKS ON TACHYON ACTION IN 2D STRING THEORY
Authors: LI MIAO
Published: November 2004

We discuss the effective action of tachyon in the two-dimensional string theory at tree level. We show that even starting from the cubic terms the action is nonlocal and the usually assumed simplest cubic term does not give the correct amplitude. Four-point 1PI terms are also discussed.
IS THERE GAUGE QUANTUM HAIR?
Authors: GONZÁLEZ-DÍAZ PEDRO F.
Published: November 2004

A wormhole instanton is found which supports spontaneous symmetry breaking of a massive scalar field conformally coupled to gravity, with the Higgs masses being stored in the baby universes that branch off from the asymptotic region. Including a new scalar field coupled minimally to gravity, the model is used to show that gauge quantum hair could not exist.
SUPERSYMMETRIC TOPOLOGICAL QUANTUM FIELD THEORIES OF DIFFERENTIAL FORMS I: GAUGE p-FORMS
Authors: SOLODUKHIN S.N.
Published: November 2004

We consider the topological theory of Witten type for gauge differential p-forms. It is shown that some topological invariants such as linking numbers appear under quantization of this theory. The non-Abelian generalization of the model is discussed.
ON MINIMAL COUPLING IN RIEMANN-CARTAN SPACE-TIMES
Authors: SAA ALBERTO
Published: November 2004

This letter discusses scalar fields on Riemann-Cartan space-times. By using a simple model, it will be shown that one has a paradox, one gets different results if minimal coupling procedure (MCP) is used in the equation of motion or in the action formulation. The problem is with the use of MCP in the action, namely with the measure of integration (volume element). A new procedure is proposed and due to it, new effects are predicted.