bluuebunny/crossref_metadata_2025 huggingface dataset:
THE OSp(32|1) VERSUS OSp(8|2) SUPERSYMMETRIC M-BRANE ACTION FROM SELF-DUAL (2, 2) STRINGS
Authors: KETOV SERGEI V.
Published: October 2004

Taking the (2, 2) strings as a starting point, we discuss the equivalent integrable field theories and analyze their symmetry structure in 2+2 dimensions from the viewpoint of string/membrane unification. Requiring the “Lorentz” invariance and supersymmetry in the (2, 2) string target space leads to an extension of the (2, 2) string theory to a theory of (2+2)-dimensional supermembranes (M-branes) propagating in a higher-dimensional target space. The origin of the hidden target space dimensions of the M-brane is related to the maximally extended supersymmetry implied by the “Lorentz” covariance and dimensional reasons. The Kähler-Chern-Simons-type action describing the self-dual gravity in 2+2 dimensions is proposed. Its maximal supersymmetric extension (of the Green-Schwarz-type) naturally leads to the 2+10 (or higher) dimensions for the M-brane target space. The proposed OSp (32|1) supersymmetric action gives the pre-geometrical description of M-branes, which may be useful for a fundamental formulation of F&M theory.
EIGENSTATES OF LINEAR COMBINATIONS OF TWO-BOSON CREATION AND ANNIHILATION OPERATORS: AN ALGEBRAIC APPROACH
Authors: SHANTA P. , CHATURVEDI S. , SRINIVASAN V.
Published: October 2004

Eigenstates of the linear combinations a2+βa†2 and ab+βa†b†of two-boson creation and annihilation operators are presented. The algebraic procedure given here is based on the work of Shanta et al. [Phys. Rev. Lett.72, 1447, (1994)] for constructing eigenstates of generalized annihilation operators. Expressions for the overlaps of these states with the number states, the coherent states and the squeezed states are given in a closed form.
LICKORISH INVARIANT AND QUANTUM OSP(1|2)
Authors: ZHANG R.B. , LEE H.C.
Published: October 2004

Lickorish’s method for constructing topological invariants of three-manifolds is generalized to the quantum supergroup setting. An invariant is obtained by applying this method to the Kauffman polynomial arising from the vector representation of U q( osp (1|2)). A transparent proof is also given showing that this invariant is equivalent to the U q( osp (1|2)) invariant obtained in an earlier publication.
SPHERICALLY SYMMETRIC SCALAR FIELD IN GENERAL RELATIVITY
Authors: KOKUBUN FERNANDO
Published: October 2004

We analyze the presence of a scalar field around a spherically symmetric distribution of an ordinary matter, obtaining an exact solution for a given scalar field distribution.
SUPER-LAX OPERATOR EMBEDDED IN SELF-DUAL SUPERSYMMETRIC YANG-MILLS THEORY
Authors: NISHINO HITOSHI
Published: October 2004

We show that the super-Lax operator for N=1 supersymmetric Kadomtsev-Petviashvili (SKP) equation of Manin and Radul in three dimensions can be embedded into recently developed self-dual supersymmetric Yang-Mills theory in 2+2 dimensions, based on general features of its underlying super-Lax equation. The whole hierarchy of the SKP equations of Manin and Radul is generated by geometrical superfield equations of self-dual supersymmetric Yang-Mills theory. The differential geometrical relationship in superspace between the embedding principle of the super-Lax operator and its associated super-Sato equation is clarified. This result provides a good guiding principle for the embedding of other integrable subsystems in the super-Lax equation into the four-dimensional self-dual supersymmetric Yang-Mills theory, which is the consistent background for N=2 superstring theory, and potentially generates other unknown supersymmetric integrable models in lower dimensions.
MUON FLUXES DERIVED FROM THE DIRECTLY MEASURED PRIMARY COSMIC RAY ELEMENTAL SPECTRA
Authors: MITRA MALA , PAL PRATIBHA , BHATTACHARYYA D.P.
Published: October 2004

The muon energy spectra at 0° and 89° have been estimated from the decay of nonprompt and prompt mesons created by the individual elemental primary cosmic ray groups during nucleus-air collisions in the upper atmosphere and the results are found to be fairly comparable with the measured muon fluxes obtained from the direct magnetic spectrograph results in Refs. 2–4, and also from the underground indirect measurements in Refs. 5–10. The muon spectrum derived from the single slope primary nucleon spectrum with a constant spectral index of value −2.73 is only slightly different from the present result for energies below 20 TeV. The present muon spectra at large zenith angle exhibit steeper spectral indices when compared to the expected results obtained from primary elemental groups by Parente et al.
ESTIMATE FOR THE 0++ GLUEBALL MASS IN QCD
Authors: LUO XIANG-QIAN , CHEN QI-ZHOU
Published: October 2004

We obtain accurate result for the lightest glueball mass of QCD in three dimensions from lattice Hamiltonian field theory. Using the dimensional reduction argument, we suggest that a good approximation for confining theories in the 0++ glueball mass in (3+1)-dimensional QCD is about 1.71 GeV.
PROBING CHARGINO-NEUTRALINO PRODUCTION AT THE FERMILAB TEVATRON COLLIDER IN A SUPERSYMMETRIC LEFT-RIGHT MODEL
Authors: FRANK M. , SAIF H.N.
Published: October 2004

We study production of chargino-neutralino through the process [Formula: see text] at the Fermilab Tevatron collider [Formula: see text] within the framework of the left-right supersymmetric model. We investigate various regions of parameter space accessible through a clean isolated trilepton signals from [Formula: see text] production for which the standard model background is expected to be tiny.
EMERGENCE OF THE HAAR MEASURE IN THE STANDARD FUNCTIONAL INTEGRAL REPRESENTATION OF THE YANG-MILLS PARTITION FUNCTION
Authors: REINHARDT H.
Published: October 2004

The conventional path integral expression for the Yang–Mills transition amplitude with flat measure and gauge-fixing built in via the Faddeev-Popov method has been claimed to fall short of guaranteeing gauge invariance in the nonperturbative regime. We show, however, that it yields the gauge-invariant partition function where the projection onto gauge-invariant wave functions is explicitly performed by integrating over the compact gauge group. In a variant of maximal Abelian gauge the Haar measure arises in the conventional Yang-Mills path integral from the Faddeev-Popov determinant.
SUPERFICIAL NON-UNITARITY OF THE QUARK-MIXING MATRIX AS A POSSIBLE EVIDENCE FOR THE SUBSTRUCTURE OF QUARKS
Authors: TERAZAWA HIDEZUMI
Published: October 2004

Superficial non-unitarity of the quark-mixing matrix, which has been predicted to be momentum transfer dependent due to the possible substructure of quarks, is discussed in composite models of quarks and leptons. A precise measurement of the momentum transfer dependence of the branching ratios for inclusive hadronic decays of τ→vτ+ hadrons and for inclusive semi-leptonic decays of K, D, B and [Formula: see text] hadrons is proposed as one of the best experimental searches for a possible evidence of the substructure of quarks.
A SUPERGRAVITY EXPLANATION OF THE CDF eeγγ EVENT
Authors: LOPEZ JORGE L. , NANOPOULOS D.V.
Published: October 2004

We present a unified no-scale supergravity model with a light gravitino that can naturally explain the observed eeγγ event at CDF via right-handed selectron pair-production. The full spectrum of our model can be described in terms of a single parameter and can be distinguished from alternative proposals in the literature. Ongoing and future runs at LEP 2 should be able to probe the full allowed parameter space via acoplanar diphoton events from [Formula: see text] production.
BUBBLE WALL DYNAMICS, GENERALIZED YUKAWA COUPLINGS AND ADEQUATE ELECTROWEAK BARYOGENESIS IN TWO-HIGGS-DOUBLET MODEL
Authors: BHOWMIK DUARI SUSMITA , YAJNIK U.A.
Published: October 2004

Baryogenesis at the electroweak scale depends on bubble wall dynamics and particle physics. We trace the dynamics of the relative phase during bubble formation in two-Higgs-doublet model (2HDM) and compute its contribution to the mechanism proposed by McLerran-Shaposhnikov-Turok-Voloshin. This enhances the intrinsic contribution of the diagram and would mean overall enhancement if diffusion processes are taken into account. We also show that in 2HDM with less stringent constraints on Yukawa couplings than those imposed by natural flavor conservation, there are additional diagrams contributing to the effective chemical potential. These two effects can combine with several others to produce adequate asymmetry at the electroweak scale.
NON-ABELIAN ANTISYMMETRIC-VECTOR COUPLING FROM SELF-INTERACTION
Authors: KHOUDEIR ADEL
Published: October 2004

A non-Abelian coupling between antisymmetric fields and Yang-Mills fields proposed by Freedman and Townsend several years ago is derived using the self-interaction mechanism.
THE QUANTUM SKdV1,4 EQUATION AT c=3
Authors: MATHIEU P.
Published: October 2004

At c=3, two of the three integrable quantum N=2 supersymmetric Korteweg-de Vries equations become identical ( SKdV 1 and SKdV 4). Quite remarkably, all their conservation laws can be written in closed form, which provides thus a simple constructive integrability proof.
ASYMPTOTIC BEHAVIOR OF MASSIVE Φ4 THEORY
Authors: AL-KUWARI HEMYAN A. , TAHA M.O.
Published: October 2004

We construct renormalization group invariant forms of the effective potential of massive Φ4 theory that yield its asymptotic behavior for large and small values of the field and mass variables. Some consequences of these asymptotic formulas are discussed.
LANDAU POLES, ULTRAVIOLET FIXED POINTS, AND “TRIVIALITY” IN THE PERTURBATIVE EXPANSION OF (λΦ4)4
Authors: CONSOLI M. , STEVENSON P.M.
Published: October 2004

The “triviality” of (λΦ4)4 means that the continuum theory has a vanishing renormalized coupling λR. This result inherently conflicts with the standard perturbative approach, which begins by postulating a nonzero, cutoff-independent λR, and which suffers from pathologies — either Landau poles (in odd orders) or spurious ultraviolet fixed points (in even orders). We show how the known structure of perturbation theory can be rearranged, to arbitrarily high orders, to fulfil the condition λR=0. The corresponding renormalization group flow of the bare coupling coincides with that needed to renormalize the effective potential, as calculated in any “triviality”-compatible approximation. Although λR vanishes, the physical mass is finite; there is no proportionality between the two. That implies that the Higgs mass does not represent a measure of the observable interaction strength in the scalar sector of the standard model.
ONE-LOOP FREE ENERGY FOR D-BRANES IN CONSTANT ELECTROMAGNETIC FIELD
Authors: BYTSENKO A.A. , ODINTSOV S.D. , GRANDA L.N.
Published: October 2004

We calculate the one-loop free energy for two parallel D-branes connected by open bosonic (neutral or charged) string in a constant uniform electromagnetic (EM) field at nonzero temperature. For neutral string, external EM field contribution appears as multiplier (Born-Infeld type action) of one-loop quantities without the external EM field. The Hagedorn temperature is not changed if compare with the case of standard string gas in the constant electromagnetic field.
REMARKS ON THE KIELANOWSKI PARAMETRIZATION OF THE KOBAYASHI-MASKAWA MATRIX
Authors: KOBAYASHI TATSUO , XING ZHI-ZHONG
Published: October 2004

We study the Kielanowski parametrization of the Kobayashi-Maskawa (KM) matrix V. A new two-angle parametrization is investigated explicitly and compared with the Kielanowski ansatz. Both of them are symmetric matrices and lead to |V13/V23|=0.129. Necessary corrections to the off-diagonal symmetry of V are also discussed.
MULTIPARTICLE THRESHOLD AMPLITUDES EXPONENTIATE IN ARBITRARY SCALAR THEORIES
Authors: LIBANOV M.V.
Published: October 2004

Threshold amplitudes are considered for n-particle production in arbitrary scalar theory. It is found that, like in Φ4, leading-n corrections to the tree level amplitudes, being summed over all loops, exponentiate. This result provides more evidence in favor of the conjecture on the exponential behavior of the multiparticle amplitudes.
A NEW APPROACH TO THE FAMILY STRUCTURE
Authors: KONG OTTO C.W.
Published: October 2004

In this letter, we introduce a new approach to formulate the family structure of the standard model. Trying to mimic the highly constrained representation structure of the standard model while extending the symmetry, we propose an SU (4) ⊗ SU (3) ⊗ SU (2) ⊗ U (1) symmetry with a SM-like chiral spectra basically “derived” from the gauge anomaly constraints. Embedding the SM leads to SU (4)A ⊗ SU (3)C ⊗ SU (2)L ⊗ U (1)X models, which upon the SU (4)A ⊗ U (1)Y symmetry breaking, gives the three families naturally as a result. A specific model obtained from the approach is illustrated. The model, or others from our approach, holds promise of a very interesting phenomenology. We sketch some of the results here. An interesting possibility of supersymmetrizing the model with the EW-Higgses already in the spectrum is noted. A comparison with other approaches is also discussed.
IS LAVELLE-McMULLAN TRANSFORMATION REALLY A NEW SYMMETRY IN QED?
Authors: PARK D.K. , KIM HUNG SOO , KIM JAE KWAN
Published: October 2004

Lavelle-McMullan symmetry of QED is examined at classical and quantum levels. It is shown that Lavelle-McMullan symmetry does not give any new nontrivial information in QED by examining the Ward-Takahashi identities. Being inspired by the examination of Ward-Takahashi identity, we construct the generalized nonlocal and noncovariant symmetries of QED.
CONSTRAINTS ON UNIFIED GAUGE THEORIES FROM NONCOMMUTATIVE GEOMETRY
Authors: LIZZI F. , MANGANO G. , MIELE G. , SPARANO G.
Published: October 2004

We analyze the possibility to extend the Connes and Lott reformulation of the standard model to larger unified gauge groups. Noncommutative geometry imposes very stringent constraints on the possible theories, and remarkably, the analysis seems to suggest that no larger gauge groups are compatible with the noncommutative structure, unless one enlarges the fermionic degrees of freedom, namely the number of particles.
SYSTEMATIC RESUMMED PERTURBATION THEORY
Authors: WETTERICH CHRISTOF
Published: October 2004

A systematic loop expansion is formulated in terms of full propagators and vertices. It is based on an expansion of the general solution of an exact nonperturbative flow equation.
GENERALIZED MATHAI-QUILLEN TOPOLOGICAL SIGMA MODELS
Authors: LLATAS PABLO M.
Published: October 2004

A simple field theoretical approach to Mathai-Quillen topological field theories of maps X : MI→MT from an internal space to a target space is presented. As an example of applications of our formalism we compute by applying our formulas the action and Q-variations of the fields of two well-known topological systems: topological quantum mechanics and type-A topological sigma model.
QUANTIZATION WITHOUT THE WITTEN ANOMALIES
Authors: KIEU T.D.
Published: October 2004

It is argued that gauge anomalies are only artefacts of the conventional quantization of quantum field theory. When the Berry’s phase is taken into consideration to satisfy certain boundary conditions of the generating path integral, the gauge anomalies associated with homotopically nontrivial gauge transformations are explicitly shown to be eliminated, without any extra quantum fields introduced.
FEIGIN-FUKS REPRESENTATIONS FOR NONEQUIVALENT ALGEBRAS OF N=4 SUPERCONFORMAL SYMMETRY
Authors: MATSUDA SATOSHI , ISHIMOTO YUKITAKA
Published: October 2004

The N=4 SU (2)k superconformal algebra has the global automorphism of SO(4)≈ SU ((2)× SU ((2) with the left factor as the Kac-Moody gauge symmetry. As a consequence, an infinite set of independent algebras labeled by ρ corresponding to the conjugate classes of the outer automorphism group SO (4)/SU(2)= SU (2) are obtained à la Schwimmer and Seiberg. We construct Feigin-Fuks representations with the ρ parameter embedded for the infinite set of the N =4 nonequivalent algebras. In our construction the extended global SU(2) algebras labeled by ρ are self-consistently represented by fermion fields with appropriate boundary conditions.
THERMAL RADIANCE FROM BLACK HOLE AND COSMOLOGICAL SPACETIMES: A UNIFIED VIEW
Authors: HU B.L. , RAVAL ALPAN
Published: October 2004

We investigate the origin and nature of thermal radiation emitted in two classes of spacetimes: in cosmological spacetimes (in general without event horizon), and in spacetimes with event horizons, such as that of an accelerated observer, a moving mirror, an eternal black hole and the inflationary universe. We propose the viewpoint that the detection of thermal radiance in these systems is a local, kinematic effect arising from the vacuum being subjected to an exponential scale transformation. In contradistinction to viewing these as global, geometric effects as is usually perceived, this viewpoint emphasizes the kinematic effect of scaling on the vacuum in altering the relative weight of quantum versus thermal fluctuations. It can also treat conditions which the geometric viewpoint cannot such as systems which do not have an event horizon. We show that in such systems radiance is indeed observed, albeit not in a precise Planckian spectrum. The deviation therefrom is determined by a parameter which measures the departure from exponential scaling which underlies uniform acceleration, eternal black holes or exact exponential cosmological expansion.
A SIMPLE SOLUTION FOR THE FLAVOR QUESTION
Authors: PISANO FELICE
Published: October 2004

We consider a simple way of solving the flavor question by embedding the three-family standard model in a semisimple gauge group extending minimally the weak isospin factor. Quantum chiral anomalies between families of fermions cancel with a matching of the number of families and the number of color degrees of freedom. Our demonstration shows how the theory leads to determination of families structure when the standard model is the input at low energies. The new physics is limited to start below a few TeVs within the reach of the next generation colliders.
PHYSICAL INTERPRETATION OF CERTAIN STRONG COUPLING SINGULARITIES
Authors: WITTEN EDWARD
Published: October 2004

We interpret certain strong coupling singularities of the E8×E8 heterotic string on K3 in terms of exotic six-dimensional theories in which E8 is a gauge symmetry. These theories are closely related to theories obtained at small instanton singularities, which have E8 as a global symmetry.
CLASSICAL DYNAMICS FOR LINEAR SYSTEMS: THE CASE OF QUANTUM BROWNIAN MOTION
Authors: ANGLIN JAMES , HABIB SALMAN
Published: October 2004

The dynamics of linear quantum systems is classical in the Wigner representation, yet linear problems are often analyzed using such general techniques as influence functionals and Bogoliubov transformations. In fact, the classical equations of motion provide a simpler and more intuitive formalism for these systems. As an important example, we show that quantum Brownian dynamics in the independent oscillator model is described directly and completely by a c-number Langevin equation. The corresponding Fokker-Planck equation is always local in time, regardless of the environmental spectrum.
SHELLS OSCILLATIONS AND RELATIVISTIC EFFECTS
Authors: SANTORO FERNANDO , LARA LUIS P. , AQUILANO ROBERTO
Published: October 2004

In this letter we show that the shells oscillations could play an important role in the physics of X-ray bursters.

We use the post-Newtonian approximation in this case and the conclusions of Ref. 1 are confirmed.
DUALITY AND SELF-DUAL TRIPLET SOLUTIONS IN EUCLIDEAN GRAVITY
Authors: MAHAPATRA SWAPNA
Published: October 2004

Starting from the self-dual “triplet” of gravitational instanton solutions in Euclidean gravity, we obtain the corresponding instanton solutions in string theory by making use of the target space duality symmetry. We show that these dual triplet solutions can be obtained from the general dual Taub-NUT de Sitter solution through some limiting procedure as in the Euclidean gravity case. The dual gravitational instanton solutions obtained here are self-dual for some cases, with respect to certain isometries, but not always.
ON MULTIPLICITY DISTRIBUTIONS
Authors: HUANG DING-WEI
Published: October 2004

We show that four different approaches in multiple production give exactly the same multiplicity distribution. Various experimental data can be well described by this new multiplicity distribution. We compare this new distribution to the negative binomial distribution. The restoration of KNO scaling at the very high energy limit is discussed. A nonvanishing value of the scaled multiplicity distribution Ψ(z) at z=0 is predicted.
HEAVY QUARK KINETIC ENERGY IN B MESONS BY A QCD RELATIVISTIC POTENTIAL MODEL
Authors: FAZIO FULVIA DE
Published: October 2004

The matrix element of the kinetic energy operator between B meson states is computed by means of a QCD relativistic potential model, with the result: [Formula: see text]. A comparison with the outcome of other theoretical approaches and a discussion of the phenomenological implications of this result are carried out.
CP SYMMETRY AND FERMION MASSES IN O(10) GRAND UNIFICATION MODELS
Authors: WU DAN-DI , WU YUE-LIANG
Published: October 2004

O(10) grand unification models which do not necessarily have an extra global symmetry are discussed, taking the model with one 10-plet in the Yukawa sector as an example. A strong correlation between mass ratios and CP is found. The mass relation mt/mb=vu/vd is recovered when GW=0; and another special relation mt/mb=GE/GW appears when vd=0, where GE,W are Yukawa coupling constants and vu,d are vevs. To facilitate this discussion, a set of O(10) γ-matrices is offered based on a physical representation of the spinors and that of the vector of the SO(10) group. Flavor changing neutral currents in such models are also discussed.
Uq(2)⊃Uq(1) DESCRIPTION OF VIBRATIONAL SPECTRA OF DIATOMIC MOLECULES
Authors: GUPTA RAJ K. , JOHAL RAMANDEEP S. , COOPER IAN L.
Published: October 2004

q-deformation of the U(1) dynamical symmetry of U(2) group is introduced for the first time for vibrations of diatomic molecules. The question of pure real and pure imaginary value of q-deformation parameter, often raised in the literature, is found to be related to the particular choice of the constants of the model. The complex q-deformation parameter is allowed, with pure real and pure imaginary values as its special cases. Compared to the other dynamical symmetry Oq(2) of Uq(2), the result of Uq(1) of Uq(2) remains better even when the vibron number in Oq(2) is varied. The role of the vibron number in the two dynamical symmetries of U(2) is shown to be different. In Uq(1) symmetry, the vibron number is fixed by the number of observed states of the system since Uq(1) represents the q-deformation of a truncated anharmonic oscillator. A possible physical meaning to the q-deformation parameter is suggested in terms of higher order anharmonicities of the truncated anharmonic oscillator.
THE LOW TEMPERATURE BEHAVIOR OF SYMMETRIC NUCLEAR MATTER
Authors: RITCHIE R.A. , MILLER H.G. , GORENSTEIN M.I.
Published: October 2004

The low temperature behavior of the nuclear binding energy of isospin symmetric nuclear matter recently derived by using a finite temperature extension to the semi-empirical mass formula appears in conflict with the Fermi gas result. We show that extensions to known mean field theoretical models of nuclear matter lead back to the Fermi gas result and hence are unable to resolve the conflict in the temperature dependence.
MAGNETIC MONOPOLE AND THE FINITE PHOTON MASS: ARE THEY COMPATIBLE?
Authors: IGNATIEV A. YU. , JOSHI G.C.
Published: October 2004

We analyze the role played by the gauge invariance for the existence of Dirac monopole. To this end, we consider the electrodynamics with massive photon and ask if the magnetic charge can be introduced there. We show that the derivation of the Dirac quantization condition based on the angular momentum algebra cannot be generalized to the case of massive electrodynamics. Possible implications of this result are briefly discussed.
COMPARING WEAK DECAYS K→2π AND D→2π
Authors: SCADRON M.D.
Published: October 2004

We show that ΔI=3/2 transitions for quark W-emission K2π diagrams and independently the current algebra-PCAC consistency scheme for all three K2π amplitudes are extremely accurate, within 3% of the data. Although the same analysis applied to D2π decays roughly approximates recent experiments, the agreement is only valid to within 25%–40% of the data.
CONFORMAL INVARIANTS OF THE EXTRINSIC GEOMETRY OF RELATIVISTIC MEMBRANES
Authors: CAPOVILLA RICCARDO , CORDERO RUBÉN , GUVEN JEMAL
Published: October 2004

We examine the change induced in the worldsheet geometry of a relativistic membrane under a conformal rescaling of the spacetime metric. As the induced transformation of the intrinsic geometry is obvious, the extrinsic geometry can be transformed nontrivially. By identifying the worldsheet scalars which transform multiplicatively, we can construct actions for extended objects which are conformally invariant.
HIGGS BOSON MASSES IN NMSSM WITH SPONTANEOUS CP-VIOLATION
Authors: ASATRIAN H.M. , YEGHIYAN G.K.
Published: October 2004

The Higgs boson mass problem is considered in the next-to-minimal supersymmetric standard model for the case of spontaneous CP-violation. The renormalization group equations for the gauge, Yukawa and scalar coupling constants, the effective Higgs potential and lower experimental bounds on Higgs boson and chargino masses are analyzed. The restrictions on the Higgs boson masses are found.
ON WILSON SURFACES IN TOPOLOGICAL CHERN-SIMONS INTERACTION IN 3+1 DIMENSIONS
Authors: LEE JUNGJAI
Published: October 2004

We comment on the regularization of the expectation values of Wilson surfaces for the bosonic string in 3+1 dimensions. We analyze the singular behaviors of propagators for the Chern-Simons action with the additional higher order terms.
HEAVISIDE TRANSFORM OF THE EFFECTIVE POTENTIAL IN THE GROSS-NEVEU MODEL
Authors: YAMADA HIROFUMI
Published: October 2004

Unconventional way of handling the perturbative series is presented with the help of Heaviside transformation with respect to the mass. We apply Heaviside transform to the effective potential in the massive Gross-Neveu model and carry out perturbative approximation of the massless potential by dealing with the resulting Heaviside function. We find that accurate values of the dynamical mass can be obtained from the Heaviside function at finite orders where just several diagrams are incorporated. We prove that our approximants converge to the exact massless potential in the infinite order. Small mass expansion of the effective potential can also be obtained in our approach.
A DIRECT PROOF OF THE COMPLETENESS OF SQUEEZED ODD NUMBER STATES
Authors: CHATURVEDI S.
Published: October 2004

A direct proof of the resolution of the identity in the odd sector of the Fock space in terms of squeezed number states D(ξ)|2m+1>;D(ξ)=exp((ξa†2−ξ*a2)/2) is given. The proof entails evaluation of an integral involving Jacobi polynomials. This is achieved by the use of Racah identities.
STUDY OF e+e− INTERACTIONS AT CENTER-OF-MASS ENERGIES OF 130 AND 136 GeV
Authors: STICHELBAUT F.
Published: October 2004

At the end of 1995, the LEP collider at CERN was operated at center-of-mass energies of 130 and 136 GeV and data corresponding to about 6 pb−1 were collected by each of the four LEP experiments. The cross-sections for fermion-pair production processes and the forward-backward asymmetries for charged lepton pairs were measured and compared to the standard model predictions. Events containing only energetic photons in the final state were used to look for effects arising from new physics. Direct searches for new particles predicted by various models beyond the standard model were performed. Searches for pair or singly produced excited leptons, for unstable charged and neutral heavy leptons, and for supersymmetric particles (chargino, neutralino, scalar leptons and scalar top quark) resulted in new exclusion limits. The ALEPH collaboration reported an excess of four-jet events in its data, which was not confirmed by the other LEP experiments.
ON THE NONRELATIVISTIC LIMIT OF THE φ4 THEORY IN 2+1 DIMENSIONS
Authors: GOMES M. , MALBOUISSON J.M.C. , DA SILVA A.J.
Published: October 2004

We study the nonrelativistic limit of the quantum theory of a real scalar field with quartic self-interaction. The two-body scattering amplitude is written in such way as to separate the contributions of high and low energy intermediary states. From this result and the two-loop computation of the self-energy correction, we determine an effective nonrelativistic action.
NEUTRINO SPECTRUM IN NONSUPERSYMMETRIC SO(10)
Authors: BARENBOIM GABRIELA
Published: October 2004

We present a predictive scheme for fermion masses and mixings inspired by nonsupersymmetric SO(10) in which the hierarchy problem is resolved without fine tuning the Yukawa couplings. This calls for a nonminimal Higgs sector which we exploit in deriving the expressions for the mass matrices. To keep the predictivity of the model under control we limit the structure of the mass matrices by imposing U(1) symmetries. A very predictive neutrino spectrum is then obtained.
NEUTRINO MIXING IN A DEMOCRATIC SEESAW MASS MATRIX MODEL
Authors: KOIDE YOSHIO
Published: October 2004

On the basis of a seesaw-type mass matrix model for quarks and leptons, [Formula: see text] where mL∝mR are universal for f=u, d, v and e (up-quark, downquark, neutrino and charged lepton sectors respectively), and MF has a form [(unit matrix)+(democratic-type matrix)], neutrino masses and mixings are investigated. We try to understand a large vµ−vτ mixing, i.e. sin2 2θ23~1, with mv1 ≪ mv2~mv3, which has been suggested by the atmospheric neutrino data.
NOTES ON OPERATOR-VALUED SOLUTIONS OF THE YANG-BAXTER EQUATION AND THE REFLECTION EQUATION
Authors: HIKAMI KAZUHIRO , KOMORI YASUSHI
Published: October 2004

We reconsider the operator-valued solutions of the Yang-Baxter equation and the reflection equation. We construct quantum Knizhnik-Zamolodchikov type operators, and discussed the relationship with the MacDonald q-polynomial theory associated with the classical root systems.
BRST QUANTIZATION OF A q-DEFORMED PHYSICAL SYSTEM
Authors: MALIK R.P.
Published: October 2004

A q-deformed free scalar relativistic particle is ħ-quantized in the framework of the BRST scheme. The q-deformed local gauge symmetry of the first-order Lagrangian has been exploited for the BRST quantization of this system on a GL q(2) invariant quantum world line. The solutions for the equations of motion respect GL q(2) invariance on the mass-shell at any arbitrary value of the evolution parameter characterizing the quantum world line. The deformation parameter q can only be ±1 due to the conservation of the q-deformed BRST charge on an arbitrary (unconstrained) manifold and the requirement of the validity of the BRST algebra.
IRREDUCIBLE REPRESENTATIONS OF JORDANIAN QUANTUM ALGEBRA Uh(sl(2)) VIA A NONLINEAR MAP
Authors: ABDESSELAM B. , CHAKRABARTI A. , CHAKRABARTI R.
Published: October 2004

The generators of the Jordanian quantum algebra Uh( sl (2)) are expressed as nonlinear invertible functions of the classical sl(2) generators. This permits immediate explicit construction of the finite-dimensional irreducible representations of the algebra Uh( sl (2)). Using this construction, new finite-dimensional solutions of the Yang-Baxter equation may be obtained.
DUALITY AND CANONICAL TRANSFORMATIONS
Authors: LOZANO Y.
Published: October 2004

We present a brief review on the canonical transformation description of some duality symmetries in string and gauge theories. In particular, we consider Abelian and non-Abelian T-dualities in closed and open string theories as well as S-duality in Abelian and non-Abelian nonsupersymmetric gauge theories.
HALPERN-HUANG DIRECTIONS IN EFFECTIVE SCALAR FIELD THEORY
Authors: PERIWAL VIPUL
Published: October 2004

Halpern and Huang recently showed that there are relevant directions in the space of interactions at the Gaussian fixed point. We show that their result can be derived from Polchinski’s form of the Wilson renormalization group. The derivation shows that the existence of these directions is independent of the cutoff function used.
FERMION MASS SINGULARITIES IN QED AND QCD AND THE MEANING OF THE KINOSHITA-LEE-NAUENBERG THEOREM
Authors: FIELD J.H.
Published: October 2004

An analysis is presented of radiative corrections due to fermion vacuum polarization for the process e−μ−→e−μ− and the full O(α2) final state QED radiative correction to [Formula: see text]. It is demonstrated that in both cases, the corrections contain next-to-leading logarithmic terms of the form α2 ln [Formula: see text]where Q is the large external scale and m is the fermion mass. These radiative corrections are infinite in the massless limit for any nonvanishing value of α. The role of Landau singularities and the relation of the above results to the Kinoshita-Lee-Nauenberg (KLN) theorem are discussed. Similar considerations also apply to the fermion sector of QCD where m is the quark mass. Thus contrary to many statements to be found in the literature no finite massless version of either QED or QCD can exist.
ENTROPY OF EXTREMAL DYONIC BLACK HOLES
Authors: GHOSH A. , MITRA P.
Published: October 2004

For extremal charged black holes, the thermodynamic entropy is proportional to the mass or charges but not proportional to the area. This is demonstrated here for dyonic extremal black hole solutions of string theory. It is pointed out that these solutions have zero classical action although the area is nonzero. By combining the general form of the entropy allowed by thermodynamics with recent observations in the literature it is possible to fix the entropy almost completely.
ON PARAMETRIZATION AND APPROXIMATION RELEVANT TO DESCRIBE VIOLATION OF CP, T AND CPT SYMMETRIES IN THE NEUTRAL KAON SYSTEM
Authors: TSAI S.Y.
Published: October 2004

We introduce several sets of parameters, which are rephasing-invariant and possess well-defined properties, to describe violation of CP, T and CPT symmetries in the [Formula: see text] system. It is pointed out that those parameters which signal T and CPT violations but not CP violation are not well constrained experimentally yet. We further introduce a set of rephasing-dependent (= phase-convention-dependent) parameters and investigate how they are related to our rephasing-invariant (= phase-convention-independent) parameters. In this way, advantages and disadvantages of and relations among various parametrizations are stated clearly.
R-DEFORMED HEISENBERG ALGEBRA
Authors: PLYUSHCHAY MIKHAIL S.
Published: October 2004

It is shown that the deformed Heisenberg algebra involving the reflection operator R (R-deformed Heisenberg algebra) has finite-dimensional representations which are equivalent to representations of para-Grassmann algebra with a special differentiation operator. Guon-like form of the algebra, related to the generalized statistics, is found. Some applications of revealed representations of the R-deformed Heisenberg algebra are discussed in the context of OSp(2|2) supersymmetry. It is shown that these representations can be employed for realizing (2+1)-dimensional supersymmetry. They also give a possibility to construct a universal spinor set of linear differential equations describing either fractional spin fields (anyons) or ordinary integer and half-integer spin fields in 2+1 dimensions.
GRAVITATIONAL CORRECTION IN NEUTRINO OSCILLATIONS
Authors: KOJIMA YASUFUMI
Published: October 2004

We investigate the quantum mechanical oscillations of neutrinos propagating in weak gravitational field. The correction to the result in the flat spacetime is derived.
NEW LARGE NUMBER HYPOTHESES AND GEOMETRICAL RELATIONS ON SUBSTRUCTURES OF THE UNIVERSE
Authors: TERAZAWA HIDEZUMI
Published: October 2004

In analogy to Dirac’s large number hypothesis (LNH), we propose the “less large number hypothesis (LLNH)” of NG~NS where NG and NS are the total number of galaxies in the universe and the average total number of stars in a galaxy since both of them are of the order of 1011. Also suggested are the two “geometrical LLNH relations” of NG~(RU/RG)2 and NS~RG/RS where RU, RG and RS are the “radius of the universe”, the average radius of a galaxy and that of a star respectively. Furthermore, it is pointed out that the “even less large number hypothesis (ELLNH)” of n1~n2~n3 may also work for n1≡RU/DG, n2≡DG/RG and n3≡RG/DS where DG and DS are the average distance between two neighboring galaxies and that between two neighboring stars since all of them are of the order of 103.
HYBRID DERIVATIVE SCALAR COUPLING TO STUDY PROPERTIES OF ASYMMETRIC NUCLEAR MATTER AND ITS PHASE TRANSITION TO QUARK MATTER
Authors: SARKAR SASABINDU , MALAKAR BINAY
Published: October 2004

We have studied properties of asymmetric nuclear matter and phase transition from this asymmetric system and also neutron matter to quark matter at zero and nonzero temperatures in the framework of recently proposed hybrid derivative scalar coupling model. We have discussed Hugenholtz-van Hove theorem and studied thermal energy, thermal pressure, symmetry energy and also incompressibility of hot dense asymmetric nuclear matter. Entropy per baryon of asymmetric nuclear matter and quark matter has been evaluated. We have also determined asymmetry dependence of density, energy per baryon of self bound asymmetric quark matter and its incompressibility.
glq(n)-COVARIANT MULTIMODE OSCILLATORS AND q-SYMMETRIC STATES
Authors: CHUNG W.-S.
Published: October 2004

In this letter the coherent states and q-symmetric states for gl q(n)-covariant multimode oscillator system are investigated.
UNITARY MATRIX MODELS AND PAINLEVÉ III
Authors: HISAKADO MASATO
Published: October 2004

We discussed the full unitary matrix models from the viewpoints of integrable equations and string equations. Coupling the Toda equations and the string equations, we derive a special case of the Painlevé III equation. From the Virasoro constraints, we can use the radial coordinate. The relation between t1 and t−1 is like the complex conjugate.
D=6 MASSIVE SPINNING PARTICLE
Authors: LYAKHOVICH S.L. , SHARAPOV A.A. , SHEKHTER K.M.
Published: October 2004

Massive spinning particle in six-dimensional Minkowski space is described as a mechanical system with the configuration space R5,1×CP3. The action functional of the model is unambiguously determined by the requirement of identical (off-shell) conservation for the phase-space counterparts of three Casimir operators of Poincaré group. The model is shown to be exactly solvable. Canonical quantization of the model leads to the equations on wave functions which prove to be equivalent to the relativistic wave equations for the irreducible 6d fields.
UNPOLARIZED NUCLEON STRUCTURE FUNCTIONS IN THE NAMBU-JONA-LASINIO CHIRAL SOLITON MODEL
Authors: WEIGEL H. , GAMBERG L. , REINHARDT H.
Published: October 2004

We study nucleon structure functions within the bosonized Nambu-Jona-Lasinio model where the nucleon emerges as a chiral soliton. As examples we present the unpolarized structure functions for the νp and [Formula: see text] scattering and discuss the Gottfried sum rule in the valence quark approximation. This approximation is justified for moderate constituent quark masses (~ 400 MeV) as the valence quark level dominates the predictions of nucleon properties. We find that these structure functions are well localized in the interval 0≤x Bj ≤1 permitting a parton model interpretation.
D-BRANE CONFIGURATION AND BLACK HOLE THERMODYNAMICS
Authors: MUKOHYAMA SHINJI
Published: October 2004

We consider a configuration of strings and solitons in the type IIB superstring theory on M5×T5, which is composed of a set of arbitrarily-wound D-five branes on T5 and a set of arbitrarily-wound D-strings on S1 of the torus. For the configuration, it is shown that number of microscopic states is bounded from above by the exponential of the Hawking-Bekenstein entropy of the corresponding black hole and the temperature of closed string radiation from the D-branes is bounded from below by the Hawking temperature of the black hole. After discussing the necessary and sufficient condition to saturate these bounds, we give some speculations about black hole thermodynamics.
LEPTONIC PHOTON AND LIGHT ELEMENT ABUNDANCIES
Authors: OKUN L.B.
Published: October 2004

In the framework of a model, in which a single leptonic photon γl has the same coupling to the doublets µνµ and [Formula: see text], there is no cosmological bound on the strength of this coupling.
DIMENSIONAL REGULARIZATION AND NUCLEAR POTENTIALS
Authors: FRIAR J.L.
Published: October 2004

It is shown how nucleon-nucleon potentials can be defined in N dimensions, using dimensional regularization to continue amplitudes. This provides an easy way to separate out contact (δ-function) terms arising from renormalization. An example is worked out several ways for the case of two-scalar particles exchanged between nucleons, which involves a very simple loop calculation. This leads to a Feynman-parameterized representation for the nucleon–nucleon potential. Alternately, a dispersion representation can be developed leading to a different, though equivalent, form.
ON THE EXISTENCE OF NONTRIVIAL FIXED POINTS IN LARGE-N GAUGE THEORY IN MORE THAN FOUR DIMENSIONS
Authors: NISHIMURA JUN
Published: October 2004

Inspired by a possible relation between large-N gauge theory and string theory, we search for nontrivial fixed points in large-N gauge theory in more than four dimensions. We study large-N gauge theory through Monte–Carlo simulation of the twisted Eguchi–Kawai model in six dimensions as well as in four dimensions. The phase diagram of the system with the two coupling constants which correspond to the standard plaquette action and the adjoint term has been explored.
PROBING ELECTROWEAK SYMMETRY BREAKING MECHANISM AT THE LHC: A GUIDELINE FROM POWER COUNTING ANALYSIS
Authors: HE HONG-JIAN , KUANG YU-PING , YUAN C.-P.
Published: October 2004

We formulate the equivalence theorem as a theoretical criterion for sensitively probing the electroweak symmetry breaking mechanism, and develop a precise power counting method for the chiral Lagrangian formulated electroweak theories. Armed with these, we perform a systematic analysis on the sensitivities of the scattering processes W±W±→W±W± and [Formula: see text] for testing all possible effective bosonic operators in the chiral Lagrangian formulated electroweak theories at the CERN Large Hadron Collider (LHC). The analysis shows that these two kinds of processes are complementary in probing the electroweak symmetry breaking sector.
SPIN-WEIGHTED GREEN’S FUNCTIONS IN A CONICAL SPACE
Authors: LINET B.
Published: October 2004

We give an analysis of the spin-weighted Green’s functions in a conical space. We apply these results in the case of a straight cosmic string and in the Rindler space in order to determine generally the Euclidean Green’s functions for the massless spin-1/2 field and for the electromagnetic field. We give also the corresponding Green’s functions at zero temperature. However, except for the scalar field, it seems that these Euclidean Green’s functions do not correspond to the thermal Feynman Green’s functions.
PARASTATISTICS AS EXAMPLES OF THE EXTENDED HALDANE STATISTICS
Authors: MELJANAC S. , MILEKOVIC M.
Published: October 2004

We show that for every algebra of creation and annihilation operators with a Fock-like representation, one can define extended Haldane statistical parameters in a unique way. In particular for parastatistics, we calculate extended Haldane parameters and discuss the corresponding partition functions.
ON THERMAL PHASE STRUCTURE OF DEFORMED GROSS–NEVEU MODEL
Authors: SATO H.-T. , TOCHIMURA H.
Published: October 2004

We illustrate the phase structure of a deformed two-dimensional Gross–Neveu model which is defined by undeformed field contents plus deformed Pauli matrices. This deformation is based on two motives to find a more general polymer model and to estimate how q-deformed field theory affects on its effective potential. Some regions where chiral symmetry breaking and restoration take place repeatedly as temperature increasing are found.
S-DUALITY AND THE ENTROPY OF BLACK HOLES IN HETEROTIC STRING THEORY
Authors: GHOSH AMIT , MAHARANA JNANADEVA
Published: October 2004

Four-dimensional heterotic string effective action is known to admit non-rotating electrically and magnetically charged black hole solutions. The partition function and entropy is computed for electrically charged black holes and is vanishing in some extremal limit. For the magnetically charged black holes the entropy is also argued to be vanishing in the same extremal limit when these black hole solutions are related by S-duality transformations.
AN EXACT SOLUTION OF THE LOOP EQUATION IN STRONG TURBULENCE
Authors: ANTONOV D.V.
Published: October 2004

The Hamilton–Jacobi equation for the loop effective action in strong turbulence with Gaussian random forces1,2 is solved by making use of the smearing procedure for the loop space functional Laplacian, proposed in Ref. 3. The solution obtained satisfies tensor- or scalar area law ansatz and depends on the initial data and the potential term in the loop Hamiltonian, averaged over loops. In the lowest order in the viscosity this average may be eliminated, and the solution is given by a certain linear combination of the initial data and the potential term and their functional derivatives.
RADIATIVE DECAY OF A MASSIVE NEUTRINO IN THE WEINBERG–SALAM MODEL WITH MIXING IN A CONSTANT UNIFORM MAGNETIC FIELD
Authors: CH. ZHUKOVSKY V. , EMINOV P.A. , GRIGORUK A.E.
Published: October 2004

Influence of an external magnetic field on the neutrino decay process with emission of a linearly polarized photon is considered. The decay rate is shown to be enhanced as compared to the free case in the broad region where both the nonvanishing neutrino mass and the field make substantial contributions. In the limit of a negligible neutrino mass the emitted photons are totally linearly polarized, which may help in the identification of these photons.
THE INHOMOGENEOUS DAM PROBLEM WITH LINEAR DARCY’S LAW AND DIRICHLET BOUNDARY CONDITIONS
Authors: LYAGHFOURI A.
Published: October 2004

In this paper we study a fluid flow through a porous medium with Dirichlet boundary conditions and a general permeability. We establish the continuity of the free boundary and the uniqueness of the S3-connected solution.
ABOUT THE SPLITTING ALGORITHM FOR BOLTZMANN AND B.G.K. EQUATIONS
Authors: DESVILLETTES L. , MISCHLER S.
Published: October 2004

We prove the convergence of splitting algorithms for transport and collision operators for Boltzmann and B.G.K. equations.
ANALYSIS AND FINITE ELEMENT METHODS FOR A FLUID-SOLID INTERACTION PROBLEM IN ONE DIMENSION
Authors: MAKRIDAKIS CH. , IHLENBURG F. , BABUŠKA I.
Published: October 2004

In this paper we study a time-harmonic fluid-solid interaction model problem in one dimension. This is a Helmholtz-type system equipped with boundary and transmission conditions. We show the existence of a unique solution to this problem and study its stability and regularity properties. We analyze the convergence of finite element methods with respect to appropriate energy norms. Computational results are also presented.
WEAK NONLINEAR CORRECTIONS FOR DARCY’S LAW
Authors: BOURGEAT ALAIN , MARUŠIĆ-PALOKA EDUARD , MIKELIĆ ANDRO
Published: October 2004

We consider the Navier-Stokes system in a periodic porous medium Ωε where ε is the characteristic pore size. The viscosity is of order εβ with 0≤β<3/2, sufficiently close to the critical exponent β=3/2. An asymptotic expansion for the velocity and the pressure, in terms of the local Reynolds number Reε=ε3−2βis set and a second-order error estimate is proved.