bluuebunny/crossref_metadata_2025 huggingface dataset:
STRUCTURE OF A=6 NUCLEI: 6He, 6Li AND 6Be
Authors: ABBAS AFSAR
Published: October 2004

It is commonly believed that (α-d) and 3 He –3 H ) represent equivalent states of 6 Li . It is shown here that this is not correct. These two are actually orthogonal to each other. It is shown here that these two with very different shapes and forms actually co-exist for the ground state of 6 Li . This shape co-existence is the same as similar phenomenon in heavy nuclei. The puzzling anomaly of extremely small branching ratio for beta delayed deuteron emission in 6 He is explained here. In addition the anomalously large branching ratio for beta delayed triton emission in 8 He is explained. The cluster structure of the ground state and of the low-lying states of 6 He , 6 Li and 6 Be is clarified.
THE NATURE OF POWER CORRECTIONS IN LARGE-β0 APPROXIMATION
Authors: LEE TAEKOON
Published: October 2004

We investigate the nature of power corrections and infrared renormalon singularities in large-β0 approximation. We argue that the power correction associated with a renormalon pole singularity should appear at O(1), in contrast to the renormalon ambiguity appearing at O(1/β0), and give an explanation why the leading order renormalon singularities are generically poles.
OPEN–CLOSED DUALITY OF INTERSECTING BRANES
Authors: YAMAGUCI HIRONORI
Published: October 2004

We construct boundary states for the intersecting branes and show their open–closed duality.
SIGNATURES OF QUANTIZED TeV SCALE BLACK HOLES IN SCATTERING PROCESSES
Authors: CHOUDHURY S. R. , CORNELL A. S. , JOSHI G. C. , McKELLAR B. H. J.
Published: October 2004

In this paper we shall study the phenomenology of a doubly charged and neutral exchange black hole in an (n+3) extra-dimensional scenario, where the black hole shall be treated as a normal quantum field.
SIMULATIONS OF HOT BUBBLES IN THE ICM
Authors: GARDINI ALESSANDRO , RICKER PAUL M.
Published: October 2004

We review the general properties of the intracluster medium (ICM) in clusters that host a cooling flow, and in particular the effects on the ICM of the injection of hot plasma by a powerful active galactic nucleus (AGN). It is observed that, in some cases, the hot plasma produces cavities in the ICM that finally detach and rise, perhaps buoyantly. The gas dynamics induced by the rising bubbles can help in explaining the absence of a cooled gas component in clusters with a cooling flow. This scenario is explored using numerical simulations.
QUANTUM STATES FROM TANGENT VECTORS
Authors: ISIDRO JOSÉ M.
Published: October 2004

We argue that tangent vectors to classical phase space give rise to quantum states of the corresponding quantum mechanics. This is established for the case of complex, finite-dimensional, compact, classical phase spaces [Formula: see text], by explicitly constructing Hilbert-space vector bundles over [Formula: see text]. We find that these vector bundles split as the direct sum of two holomorphic vector bundles: the holomorphic tangent bundle [Formula: see text], plus a complex line bundle [Formula: see text]. Quantum states (except the vacuum) appear as tangent vectors to [Formula: see text]. The vacuum state appears as the fibrewise generator of [Formula: see text]. Holomorphic line bundles [Formula: see text] are classified by the elements of [Formula: see text], the Picard group of [Formula: see text]. In this way [Formula: see text] appears as the parameter space for nonequivalent vacua. Our analysis is modelled on, but not limited to, the case when [Formula: see text] is complex projective space CPn.
A NEW COSMOLOGICAL CONSTANT MODEL
Authors: LOPEZ JORGE L. , NANOPOULOS D.V.
Published: October 2004

We propose a new cosmological model with a time-dependent cosmological constant (Λ∝1/t2), which starting at the Planck time as [Formula: see text], evolves to the present-day allowed value of [Formula: see text]. This scenario is supported by noncritical string theory considerations. We compute the age of the Universe and the time dependence of the scale factor in this model, and find general agreement with recent determinations of the Hubble parameter for substantial values of ΩΛ. This effectively low-density open Universe model differs from the traditional cosmological constant model, and has observable implications for particle physics and cosmology.
SYMMETRIES OF THE DIMENSIONALLY REDUCED STRING EFFECTIVE ACTION
Authors: MAHARANA JNANADEVA
Published: October 2004

A two-dimensional string effective action is obtained by dimensionally reducing the bosonic part of the 10-dimensional heterotic string effective action. It is shown that this effective action, with a few restrictions on some backgrounds, describes a two-dimensional model which admits an infinite sequence of nonlocal conserved currents.
CALCULATION RULE FOR AOYAMA-TAMRA’S PRESCRIPTION FOR PATH INTEGRAL WITH QUANTUM TUNNELING
Authors: SUZUKI HIROSHI
Published: October 2004

We derive a simple calculation rule for Aoyama-Tamra’s prescription for path integral with degenerated potential minima. Nonperturbative corrections due to the restricted functional space (fundamental region) can systematically be computed with this rule. It becomes manifest that the prescription might give Borel summable series for finite temperature (or volume) system with quantum tunneling, while the advantage is lost at zero temperature (or infinite volume) limit.
HEAVY QUARK PHOTOPRODUCTION IN THE SEMIHARD APPROACH AT HERA AND BEYOND
Authors: SALEEV V.A. , ZOTOV N.P.
Published: October 2004

Processes of heavy quark photoproduction at HERA energies and beyond are investigated using the semihard (k⊥ factorization) approach. Virtuality and longitudinal polarization of gluons in the photon-gluon subprocess as well as the saturation effects in the gluon distribution function at small x have been taken into account. The total cross-sections, rapidity and p⊥ distributions of the charm and beauty quark photoproduction have been calculated. The results are compared with ZEUS experimental data for charm photoproduction cross-section.
A REALIZATION OF q-DEFORMED U(1) KAC-MOODY AND VIRASORO ALGEBRAS THROUGH THE ā∞ ALGEBRA
Authors: HASSOUNI A. EL , HASSOUNI Y. , TAHRI E.H. , ZAKKARI M.
Published: October 2004

A representation of one-parameter deformation of U(1) Kac-Moody and Virasoro algebras is obtained throughout the infinite matrix algebra ā∞. Their central extensions are also investigated.
VALLEY INSTANTON IN THE GAUGE-HIGGS SYSTEM
Authors: AOYAMA HIDEAKI , HARANO TOSHIYUKI , SATO MASATOSHI , WADA SHINYA
Published: October 2004

The instanton configuration in the SU(2)-gauge system with a Higgs doublet is constructed by using the new valley method. This method defines the configuration by an extension of the field equation and allows the exact conversion of the quasi-zero eigen-mode to a collective coordinate. It does not require ad hoc constraints used in the current constrained instanton method and provides a better mathematical formalism than the constrained instanton method. The resulting instanton, which we call “valley instanton”, is shown to have the desirable behaviors. The result of the numerical investigation is also presented.
FUSION AND TENSORING OF CONFORMAL FIELD THEORY AND COMPOSITE FERMION PICTURE OF FRACTIONAL QUANTUM HALL EFFECT
Authors: FLOHR MICHAEL A.I.
Published: October 2004

We propose a new way for describing the transition between two quantum Hall effect states with different filling factors within the framework of rational conformal field theory. Using a particular class of nonunitary theories, we explicitly recover Jain’s picture of attaching flux quanta by the fusion rules of primary fields. Filling higher Landau levels of composite fermions can be described by taking tensor products of conformal theories. The usual projection to the lowest Landau level corresponds then to a simple coset of these tensor products with several U(1)-theories divided out. These two operations — the fusion map and the tensor map — can explain the Jain series and all other observed fractions as exceptional cases. Within our scheme of transitions we naturally find a field with the experimentally observed universal critical exponent 7/3.
FADDEEV-JACKIW FORMALISM FOR A TOPOLOGICAL-LIKE OSCILLATOR IN PLANAR DIMENSIONS
Authors: NATIVIDADE C.P. , BOSCHI-FILHO H.
Published: October 2004

The problem of a harmonic oscillator coupling to an electromagnetic potential plus a topological-like (Chern-Simons) massive term, in two-dimensional space, is studied in the light of the symplectic formalism proposed by Faddeev and Jackiw for constrained systems.
PAGELS TYPE ACTION FROM TOPOLOGICAL GAUGE THEORY IN FIVE DIMENSIONS
Authors: NIETO J.A. , OBREGÓN O.
Published: October 2004

Applying a particular dimensional reduction mechanism to the Chern-Simons five-form action proposed by Chamseddine we derive a Pagels type action from which the Einstein-Hilbert action in (3+1) dimensions may be obtained. Our result may appear of interest in the quest to find a transition from nondynamical to dynamical gravity.
IS THE COULOMB GAUGE ALWAYS REALIZABLE?
Authors: MAGPANTAY J.A. , CUANSING E.
Published: October 2004

A class of field configurations, those that satisfy (∂ · D)(∂ · A)=0 with ∂ · A≠0, and satisfying spherical symmetry is shown to be not transformable to the Coulomb gauge in the context of L2 fields. This is shown by considering all kinds of gauge transformations — infinitesimal, finite, and large gauge transformations.
EQUIVALENCE OF GEOMETRIC h<1/2 AND STANDARD c>25 APPROACHES TO TWO-DIMENSIONAL QUANTUM GRAVITY
Authors: TAKHTAJAN LEON A.
Published: October 2004

We show the equivalence between the standard weak coupling regime c>25 of the two-dimensional quantum gravity and regime h<1/2 of the original geometric approach of Polyakov,1,2 developed in Refs. 3–5.
SMALL x BEHAVIOR OF PARTON DISTRIBUTIONS IN PROTON
Authors: KOTIKOV A.V.
Published: October 2004

The paper presents the QCD description of the deep-inelastic lepton-hadron process at small x in the framework of the Wilson operator product expansion. The smooth transition between the cases of the soft and hard Pomerons is obtained.
QUARTIC ANHARMONIC OSCILLATOR AND RANDOM MATRIX THEORY
Authors: CICUTA G.M. , STRAMAGLIA S. , USHVERIDZE A.G.
Published: October 2004

In this letter the relationship between the problem of constructing the ground state energy for the quantum quartic oscillator and the problem of computing mean eigenvalue of large positively definite random hermitian matrices is established. This relationship enables one to present several more or less closed expressions for the oscillator energy. One of such expressions is given in the form of simple recurrence relations derived by means of the method of orthogonal polynomials which is one of the basic tools in the theory of random matrices.
PREPOTENTIALS OF N=2 SUPERSYMMETRIC GAUGE THEORIES AND SOLITON EQUATIONS
Authors: EGUCHI TOHRU , YANG SUNG-KIL
Published: October 2004

Using recently proposed soliton equations we derive a basic identity for the scaling violation of N=2 supersymmetric gauge theories Σiai∂F/∂ai−2F=8πib1u. Here F is the prepotential, ai’s are the expectation values of the scalar fields in the vector multiplet, u=1/2 Tr<ϕ2> and b1 is the coefficient of the one-loop β-function. This equation holds in the Coulomb branch of all N=2 supersymmetric gauge theories coupled with massless matter.
AFFINE LIE ALGEBRA SYMMETRY OF SINE-GORDON THEORY AT REFLECTIONLESS POINTS
Authors: LECLAIR ANDRÉ , NEMESCHANSKY DENNIS
Published: October 2004

The quantum affine symmetry of the sine-Gordon theory at q2=1, which occurs at the reflectionless points, is studied. Conserved currents that correspond to the closure of simple root generators are considered, and shown to be local. We argue that they satisfy the [Formula: see text] algebra. Examples of these currents are explicitly constructed.
A THERMODYNAMICAL BAG MODEL FOR THE NUCLEON SPIN
Authors: DEVANATHAN V. , McCARTHY J.S.
Published: October 2004

A thermodynamical bag model was developed to study the nucleon spin. Equations of state for the bag are deduced and solved self-consistently. The recent experimental data of the SMC and the E143 collaboration and the Bjorken sum rule are completely explained within the framework of the model.
WHITHAM-TODA HIERARCHY AND N=2 SUPERSYMMETRIC YANG-MILLS THEORY
Authors: NAKATSU TOSHIO , TAKASAKI KANEHISA
Published: October 2004

The exact solution of N=2 supersymmetric SU(N) Yang-Mills theory is studied in the framework of the Whitham hierarchies. The solution is identified with a homogeneous solution of a Whitham hierarchy. This integrable hierarchy (Whitham-Toda hierarchy) describes modulation of a quasiperiodic solution of the (generalized) Toda lattice hierarchy associated with the hyperelliptic curves over the quantum moduli space. The relation between the holomorphic pre-potential of the low energy effective action and the τ-function of the (generalized) Toda lattice hierarchy is also clarified.
SOME COMMENTS ON MASSIVE FERMIONS
Authors: HUNG P.Q. , NUSSINOV S.
Published: October 2004

In this letter, we point out that a discovery of very heavy (mF≥few TeV ) fermions at a future collider is possible only under special circumstances. In particular, we argue that such fermions are likely to be accompanied by new gauge interactions.
THIN SPHERICALLY SYMMETRIC RADIATING SHELLS AND BLACK HOLES
Authors: ACERO SERGIO , AQUILANO ROBERTO , OCAMPO SEBASTIÁN , RÉBOLA ALEJANDRO
Published: October 2004

Using the shell formalism, relativistic effects could eventually be detected in X-ray novae.
KALUZA-KLEIN MAGNETIC MONOPOLES AND WORMHOLES
Authors: AGNESE A.G. , CAMERA M. LA
Published: October 2004

It is shown that a five-dimensional Kaluza-Klein theory, obtained by a “total space” conformal gauge from a four-dimensional charged dilaton gravity, can describe spacetimes supporting both magnetic monopoles and wormhole geometry.
THE UNIVERSAL R-MATRIX FOR THE JORDANIAN DEFORMATION OF sl(2), AND THE CONTRACTED FORMS OF so(4)
Authors: SHARIATI A. , AGHAMOHAMMADI A. , KHORRAMI M.
Published: October 2004

We introduce a universal R-matrix for the Jordanian deformation of U( sl (2)). Using Uh( so (4))=Uh( sl (2)) ⊕ U−h( sl (2)), we obtain the universal R-matrix for Uh( so (4)). Applying the graded contractions on the universal R-matrix of Uh( so (4)), we show that there exist three distinct R-matrices for all the contracted algebras. It is shown that Uh( sl (2)), Uh( so (4)), and all of these contracted algebras are triangular.
A NEW TYPE OF q-COHERENT STATES AND ITS APPLICATIONS
Authors: YANG YAPING , YU ZURONG
Published: October 2004

In this letter, a new type of q-coherent states with M components is introduced. Some properties of the q-coherent state are discussed. The cycle representations of quantum algebra SU q(2) are obtained by means of the two-mode q-coherent states.
A STUDY ABOUT THE SOLUTIONS OF SCHRÖDINGER EQUATION WITH AN ASYMPTOTICALLY LINEAR POTENTIAL
Authors: FILHO ELSO DRIGO
Published: October 2004

We determine the solutions of the Schrödinger equation for an asymptotically linear potential. Analytical solutions are obtained by superalgebra in quantum mechanics and we establish when these solutions are possible. Numerical solutions for the spectra are obtained by the shifted 1/N expansion method.
A NOTE ON MAJORANA NEUTRINOS, LEPTONIC CKM AND ELECTRON ELECTRIC DIPOLE MOMENT
Authors: NG DANIEL , NG JOHN N.
Published: October 2004

The electric dipole moment of the electron, de, is known to vanish up to three-loop in the standard model with massless neutrinos. However, if neutrinos are massive Majorana particles, we obtain the result that de induced by leptonic CKM mechanism is nonvanishing at two-loop order, and it applies to all massive Majorana neutrino models.
INTER-HADRON QCD-INDUCED DIFFEOMORPHISMS FROM A RADIAL EXPANSION OF THE GAUGE FIELD
Authors: NE’EMAN YUVAL , ŠIJAČKI DJORDJE
Published: October 2004

In a previous work,1 we proved that a subset of the QCD local SU (3)color gauge transformations, involving color-neutral gluon field operator products, reproduces effective local diffeomorphisms. That proof involved integrations by parts, with possible surface terms. We present an alternative proof, which does not involve integrations, based on a radial expansion. It also provided new insight into the structure of the gluon fields.
CANONICAL QUANTIZATION OF BIANCHI CLASS A MODELS IN N=2 SUPERGRAVITY
Authors: CHENG A.D.Y. , MONIZ P.V.
Published: October 2004

The theory of N=2 supergravity is applied to Bianchi class A models. Their canonical formulation is addressed for two cases: when the O(2) internal symmetry is (a) global or (b) local. A cosmological constant and mass-like term for the gravitinos are required in the latter but are absent in the former. For the case of global O(2) symmetry, it is shown that the presence of a Maxwell field in the supersymmetry constraints is sufficient to imply a non-conservation of the fermionic number. This effect corresponds to a mixing between different Lorentz invariant fermionic sectors in the wave function of the universe. It is similar to what a cosmological constant term would have caused but considerably different from what occurs in FRW and Bianchi models in N=1 supergravity with scalar fields and fermionic partners. The nonconservation effect is interpreted from the point of view of N=2 supergravity theory. For case (b), we obtain the more general solution of the gauge constraint. Possible quantum physical states are then discussed regarding previous works where Ashtekar variables have been used. These states can be obtained from an N=2 supersymmetric Chern-Simons functional. Some comments concerning the physical validity of the Chern-Simons solution and its transformation into metric representation variables are included.
GAUGE-BOSON SCATTERING IN A HIDDEN SYMMETRY BREAKING SECTOR AT e+e− COLLIDERS
Authors: RAMANA M.V.
Published: October 2004

We calculate the production rate of gauge-boson pairs at e+e− colliders in a model with a “hidden” electroweak symmetry breaking sector, i.e. one in which there is a large number of particles in the symmetry breaking sector other than the W± and Z0. We show that the background exceeds the two gauge-boson fusion signals of electroweak symmetry breaking. This implies that in order to explore this model we must be prepared to observe final states other than gauge-bosons.
SCHRÖDINGER EQUATION FOR HEAVY MESONS EXPANDED IN 1/mQ
Authors: MATSUKI TAKAYUKI
Published: October 2004

Operating just once the naive Foldy-Wouthuysen-Tani transformation on the Schrödinger equation for [Formula: see text] bound states described by a Hamiltonian, we systematically develop a perturbation theory in 1/mQ which enables one to solve the Schrödinger equation to obtain masses and wave functions of the bound states in any order of 1/mQ. There also appear negative components of the wave function in our formulation which contribute also to higher order corrections to masses.
THE EQUIVALENCE BETWEEN THE CHIRAL SCHWINGER MODEL AND THE MODEL WITH A WESS-ZUMINO TERM
Authors: AWAD ADEL M.M.
Published: October 2004

Dirac’s method of quantization is used to give a simple, intuitive demonstration of the equivalence of the physical Hilbert spaces of the chiral Schwinger model and the same model with a Wess-Zumino term added in order to restore gauge invariance. The zero modes of the fields are properly treated in the general compact case, and the interplay of the first and second class constraints of the model is stressed.
BILAYERS IN FOUR DIMENSIONS AND SUPERSYMMETRY
Authors: ATTAL ROMAIN
Published: October 2004

We build N=1 superstrings in ℝ4 out of purely geometric bosonic data. The worldsheet is a bilayer of uniform thickness and the 2-D supercharge vanishes in a natural way.
NUMERICAL COMPUTATION OF THE EFFECTIVE POTENTIAL AND RENORMALIZATION
Authors: PALMA G. , VERGARA L.
Published: October 2004

We present a novel way to compute the one-loop ring-improved effective potential numerically, avoiding the spurious appearance of complex expressions and at the same time is free from the renormalization ambiguities of the self-consistent approaches, based on the direct application of Schwinger-Dyson type equations to the masses.
THE DISCUSSION OF ELECTROWEAK PARAMETERS IN TECHNICOLOR MODELS WITH A SCALAR DOUBLET
Authors: YUE CHONG-XING , KUANG YU-PING , LU GONG-RU , WAN LING-DE
Published: October 2004

In technicolor models with a scalar doublet, we discuss the effect of the custodial isospin violation on the electroweak parameters S and T in one-loop perturbation theory. We find that the “high-energy” contributions to the parameter S could be reduced by the mass splitting of technifermions p and m. The leading contributions to the parameter T come from the technifermions p−m mass splitting and may exceed the experimental bounds. However, the value of parameter T can be reduced by adjusting the value of δ.
CP-ASYMMETRIES IN NEUTRAL B-MESON DECAYS IN A CLASS OF LEFT-RIGHT SYMMETRIC MODELS
Authors: SZE W.K. , YAO HERNG
Published: October 2004

In left-right symmetric models with a general right-handed quark mixing matrix VR, CP-asymmetries of neutral B-mesons can deviate appreciably from the standard model prediction. By assuming a Gronau-Wakaizumi (GW) form of VR, we calculate asymmetries of B0 decays to two-body CP-eigenstates for various possible right-handed gauge boson mass MR. It is found that these CP-asymmetries show a sharp transition from the GW results to the standard model ones in the neighborhood of MR≃800 GeV .
THE BRAIDED QUANTUM TWO-SPHERE
Authors: CHU CHONG-SUN , HO PEI-MING , ZUMINO BRUNO
Published: October 2004

In a recent paper the quantum two-sphere [Formula: see text] was described as a quantum complex manifold. Here we consider several copies of [Formula: see text] and derive their braiding commutation relations. The braiding is extended to the differential and to the integral calculus on the spheres. A quantum analog of the classical anharmonic ratio of four points on the sphere is given, which is invariant under the co-action of SU q(2).
ON COVARIANT DERIVATIVES AND GAUGE INVARIANCE IN THE PROPER TIME FORMALISM FOR STRING THEORY
Authors: SATHIAPALAN B.
Published: October 2004

It is shown that the idea of “minimal” coupling to gauge fields can be conveniently implemented in the proper time formalism by identifying the equivalent of a “covariant derivative”. This captures some of the geometric notion of the gauge field as a connection. The proper time equation is also generalized so that the gauge invariances associated with higher spin massive modes can be made manifest, at the free level, using loop variables. Some explicit examples are worked out illustrating these ideas.
AN ASYMPTOTICALLY FREE CHIRAL LINEAR SIGMA MODEL WITH QUARKS COUPLED TO GLUONS
Authors: SONI VIKRAM
Published: October 2004

We show that the chiral σ-model with quarks when coupled to gluons can be asymptotically free. Alternatively, this theory is QCD that is chirally extended by the addition of a (σ, π) chiral multiplet. It could therefore be a possible theory for the strong interactions.
A NEW HYPOTHESIS ON THE ORIGIN OF THE THREE GENERATIONS
Authors: BASS S.D. , THOMAS A.W.
Published: October 2004

We suggest that the standard model may undergo a supercritical transition near the Landau scale, where the U(1) gauge-boson couples to the left- and right-handed states of any given fermion with different charges. This scenario naturally gives rise to three generations of fermion, corresponding to the three critical scales for the right-right, right-left and left-left fermion interactions going supercritical, as well as CP-violation in the quark sector.
MULTI-PLAQUETTE SOLUTIONS FOR DISCRETIZED ASHTEKAR GRAVITY
Authors: EZAWA KIYOSHI
Published: October 2004

A discretized version of canonical quantum gravity proposed by Loll is investigated. After slightly modifying Loll’s discretized Hamiltonian constraint, we encode its action on the spin network states in terms of combinatorial topological manipulations of the lattice loops. Using this topological formulation we find new solutions to the discretized Wheeler-DeWitt equation. These solutions have their support on the connected set of plaquettes. We also show that these solutions are not normalizable with respect to the induced heat-kernel measure on SL(2, C) gauge theories.
THE QUATERNIONIC DIRAC LAGRANGIAN
Authors: DE LEO STEFANO , ROTELLI PIETRO
Published: October 2004

We discuss the use of the variational principle within quaternionic quantum mechanics. This is nontrivial because of the noncommutative nature of quaternions. We derive the Dirac-Lagrangian density corresponding to the two-component Dirac equation. This Lagrangian is complex projected as anticipated in previous articles and this feature is necessary even for a classical real Lagrangian.
LOW ENERGY DYNAMICS OF MONOPOLES IN N=2 SYM WITH MATTER
Authors: CEDERWALL MARTIN , FERRETTI GABRIELE , NILSSON BENGT E.W. , SALOMONSON PER
Published: October 2004

We derive, for N=2 super-Yang-Mills with gauge group SU(2) and massless matter, the supersymmetric quantum mechanical models describing the time evolution of multimonopole configurations in the low energy approximation. This is a first step towards identifying the solitonic states mapped to fundamental excitations by duality in the model with four hypermultiplets in the fundamental representation.
PSEUDOCLASSICAL MODEL FOR CHERN-SIMONS PARTICLES
Authors: GITMAN D.M. , TYUTIN I.V.
Published: October 2004

Pseudoclassical supersymmetrical model to describe massive spin-one particles in (2+1) dimensions is proposed. A quantization of the model leads to the theory of Chern-Simons particles. In particular, one can see that the equations of the topologically massive gauge theory are reproduced in the course of quantization. For comparison a pseudoclassical model for Proca particles in (2+1) dimensions is constructed and discussed.
DUAL POLYHEDRA, MIRROR SYMMETRY AND GINZBURG-LANDAU ORBIFOLDS
Authors: SATO HITOSHI
Published: October 2004

New geometrical features of the Ginzburg-Landau orbifolds are presented, for models with a typical type of superpotential. We show the one-to-one correspondence between some of the (a, c) states with U(1) charges (−1, 1) and the integral points on the dual polyhedra, which are useful tools for the construction of mirror manifolds. Relying on toric geometry, these states are shown to correspond to the (1, 1) forms coming from blowing-up processes. In terms of the above identification, it can be checked that the monomial-divisor mirror map for Ginzburg-Landau orbifolds, proposed by the author, is equivalent to that mirror map for Calabi-Yau manifolds obtained by the mathematicians.
MINIMAL BOSONIZATION OF SUPERSYMMETRY
Authors: PLYUSHCHAY MIKHAIL S.
Published: October 2004

The minimal bosonization of supersymmetry in terms of one bosonic degree of freedom is considered. A nontrivial relationship of the construction to the Witten supersymmetric quantum mechanics is illustrated with the help of the simplest N=2 SUSY system realized on the basis of the ordinary (undeformed) bosonic oscillator. It is shown that the generalization of such a construction to the case of Vasiliev deformed bosonic oscillator gives a supersymmetric extension of the two-body Calogero model in the phase of exact or spontaneously broken N=2 SUSY. The construction admits an extension to the case of the OSp(2|2) supersymmetry, and, as a consequence, osp(2|2) superalgebra is revealed as a dynamical symmetry algebra for the bosonized supersymmetric Calogero model. Realizing the Klein operator as a parity operator, we construct the bosonized Witten supersymmetric quantum mechanics. Here the general case of the corresponding bosonized N=2 SUSY is given by an odd function being a superpotential.
TRACE ANOMALIES AND COCYCLES OF WEYL AND DIFFEOMORPHISMS GROUPS
Authors: KARAKHANYAN D.R. , MANVELYAN R.P. , MKRTCHYAN R.L.
Published: October 2004

The general structure of trace anomaly, suggested recently by Deser and Schwimmer is argued to be the consequence of the Wess-Zumino consistency condition. The response of partition function on a finite Weyl transformation, which is connected with the cocycles of the Weyl group in d=2k dimensions is considered, and explicit answers for d=4, 6 are obtained. In particular, it is shown that addition of the special combination of the local counterterms leads to the simple form of that cocycle, quadratic over Weyl field σ, i.e. the form, similar to the two-dimensional Liouville action. This form also establishes the connection of the cocycles with conformal-invariant operators of order d and zero weight. We also give the general rule for transformation of that cocycles into the cocycles of diffeomorphisms group.
THE OTHER SPECTRAL FLOW
Authors: GATO-RIVERA BEATRIZ , ROSADO JOSE IGNACIO
Published: October 2004

Recently we showed that the spectral flow acting on the N=2 twisted topological theories gives rise to a topological algebra automorphism. Here we point out that the untwisting of that automorphism leads to a spectral flow on the untwisted N=2 super-conformal algebra which is different from the usual one. This “other” spectral flow does not interpolate between the chiral ring and the antichiral ring. In particular it maps the chiral ring into the chiral ring and the antichiral ring into the antichiral ring. We discuss the similarities and differences between these two spectral flows. We also analyze their action on null states.
ABSORPTION PROBABILITY OF DE SITTER HORIZON FOR MASSLESS FIELDS WITH SPIN
Authors: SUZUKI HISAO , TAKASUGI EIICHI
Published: October 2004

The thermal flux emitted by a de Sitter universe due to interaction with massless fields with spin is examined. We found the exact solutions of the radial equation for spin 0, 1/2, 1 and 2 and calculated the absorption probability using asymptotic expansion for high frequency limit. It turns out that the absorption coefficients are universal for all bosonic fields, i.e. they do not depend on the spin, but depend only on the total angular momentum. In particular, for spin-1/2 fermions, we found nonvanishing absorption probability in contrast to the previous vanishing result.
SUq(3) CHARGED AND HYPERCHARGED q-COHERENT STATE
Authors: YANG YAPING , YU ZURONG
Published: October 2004

In this letter, the SU q (3) charged and hypercharged q-coherent states for both q-bosonic and q-fermionic cases are constructed with the help of q-bosonic and q-fermionic realizations.
QUASI FROBENIUS LIE ALGEBRAS CONSTRUCTION OF N=4 SUPERCONFORMAL FIELD THEORIES
Authors: PARKHOMENKO S.E.
Published: October 2004

The Manin triples construction of N =4 superconformal field theories is considered. A correspondence between quasi Frobenius finite-dimensional Lie algebras and N =4 Virasoro superalgebras is established.
THE ISOSPIN AND STRANGENESS DEPENDENCIES OF THE BARYON VERTICES IN 1/Nc EXPANSION
Authors: TAKAMURA AKIRA
Published: October 2004

We apply the 1/N c expansion in QCD to the baryon vertices. In addition to the well-known I = J rule, we find model-independent properties among the isospin and strangeness dependencies of the isoscalar and isovector baryon vertices.
CRITICAL PHENOMENON AND TOPOLOGICAL FIELD THEORIES IN THREE DIMENSIONS
Authors: AWADA M. , GIBBS R. , MOKHTARI S.
Published: October 2004

We give a new mechanism for Bose-Fermi transmutation based on phase transition in a renormalizable generalization of the three-dimensional CP 1 model coupled to a U(1) Chern-Simons theory. The generalization involves the addition of the scale invariant curvature term of the world line of the point particle. The short range disordered phase has a mass spectrum which corresponds to that of a single spinless bosonic point particle while the long range ordered phase has an infinite spinning Majorana mass spectrum. On the world line these Majorana particles have fermionic degrees of freedom.
NUMERICAL STUDY OF INDUCED FALSE VACUUM DECAY AT HIGH ENERGIES
Authors: KUZNETSOV A.N. , TINYAKOV P.G.
Published: October 2004

We calculate numerically the probability exp [Formula: see text] of the false vacuum decay in the massive four-dimensional −λϕ4 model from multiparticle initial states with fixed number of particles N whose total energy E is of order or greater than the height of the barrier E sph. We find that at E≲3E sph and N≲0.4N sph the decay is classically forbidden and thus is exponentially suppressed. We argue that the classically forbidden region extends, at small N, at least up to E~10E sph and, most likely, to all energies. Our data suggest that the false vacuum decay induced by two-particle collisions is exponentially suppressed at all energies.
Ψ-VECTORS FOR THREE-DIMENSIONAL MODELS
Authors: SERGEEV S.M. , BOOS G.E. , MANGAZEEV V.V. , STROGANOV YU.G.
Published: October 2004

In this letter we apply the method of ψ-vectors to the three-dimensional statistical model. This method gives the correspondence between the Bazhanov-Baxter model and its vertex version. We also apply the ψ-vectors method to the self-dual planar model.
FROM HAMILTONIAN TO LAGRANGIAN Sp(2) BRST QUANTIZATION
Authors: BERING K.
Published: October 2004

We give a formal proof of the equivalence of Hamiltonian and Lagrangian BRST quantization. This is done for a generic Sp(2)-symmetric theory using flat (Darboux) coordinates. A new quantum master equation is derived in a Hamiltonian setting which contains all the Hamiltonian fields and momenta of a given theory.
SYMPLECTIC QUANTIZATION OF A VECTOR-TENSOR GAUGE THEORY WITH TOPOLOGICAL COUPLING
Authors: BARCELOS-NETO J. , SILVA M.B.D.
Published: October 2004

We use the symplectic formalism to quantize a gauge theory where vectors and tensors fields are coupled in a topological way. This is an example of reducible theory and a procedure like of ghosts-of-ghosts of the BFV method is applied but in terms of Lagrange multipliers. Our final results are in agreement with the ones found in the literature by using the Dirac method.
REAL TIME QUANTUM FIELD THEORY AT FINITE TEMPERATURE IN AN INHOMOGENEOUS MEDIA
Authors: BIBILASHVILI TENGIZ M.
Published: October 2004

The method of the real time perturbative calculations of nonequilibrium averages is generalized to the case of varying chemical potential. Calculations are performed in the frame of Zubarev’s nonequilibrium density matrix approach. In this approach perturbations of temperature and other thermodynamical parameters are taken into account explicitly including nonlinear terms. It differs from the Schwinger-Keldysh approach through the choice of more general initial conditions for the density matrix.
QUANTUM DEFORMATION OF igl(n) ALGEBRA ON QUANTUM SPACE
Authors: KOBAYASHI TATSUO , SATO HARU-TADA
Published: October 2004

We study quantum deformed gl(n) and igl(n) algebras on a quantum space discussing multi-parametric extension. We realize elements of deformed gl(n) and igl(n) algebras by a quantum fermionic space. We investigate a map between deformed igl(2) algebras of our basis and other basis.
INTEGRABLE FIELD THEORIES DERIVED FROM 4-D SELF-DUAL GRAVITY
Authors: UENO TATSUYA
Published: October 2004

We reformulate the self-dual Einstein equation as a trio of differential form equations for simple two-forms. Using them, we can quickly show the equivalence of the theory and 2-D sigma models valued in infinite-dimensional group, which was shown by Park and Husain earlier. We also derive other field theories including the 2-D Higgs bundle equation. This formulation elucidates the relation among these field theories.
A TWO-TERM TRUNCATION OF THE MULTIPLE ISING MODEL COUPLED TO 2-D GRAVITY
Authors: HARRIS M.G.
Published: October 2004

We consider a model of p independent Ising spins on a dynamical planar ϕ3 graph. Truncating the free energy to two terms yields an exactly solvable model that has a third-order phase transition from a pure gravity region (γ str =−1/2) to a tree-like region (γ str =1/2), with γ str =1/3 on the critical line. We are able to make an order of magnitude estimate of the value of p above which there exists a branched polymer (i.e. tree-like) phase in the full model, that is, p~13–23, which corresponds to a central charge of c ~6–12.
LOOP VARIABLES AND GAUGE INVARIANT INTERACTIONS OF MASSIVE MODES IN STRING THEORY
Authors: SATHIAPALAN B.
Published: October 2004

The loop variable approach used earlier to obtain free equations of motion for the massive modes of the open string, is generalized to include interaction terms. These terms, which are polynomial, involve only modes of strictly lower mass. Considerations based on operator product expansions suggest that these equations are particular truncations of the full string equations. The method involves broadening the loop to a band of finite thickness that describes all the different interacting strings. Interestingly. in terms of these variables. the theory appears non-interacting.
BOTTOM QUARK PRODUCTION CROSS-SECTION AT HERA-B
Authors: KIDONAKIS N. , SMITH J.
Published: October 2004

The cross-section for bottom quark production is calculated for the HERA-B experiment. We consider both the order [Formula: see text] cross-section and the resummation of soft gluon corrections in all orders of QCD perturbation theory.
THE MINIMAL SUPERSYMMETRIC STANDARD MODEL
Authors: CSÁKI CSABA
Published: October 2004

The structure of the MSSM is reviewed. We first motivate the particle content of the theory by examining the quantum numbers of the known standard model particles and by the requirement of anomaly cancellation.

Once the particle content is fixed we can write down the most general renormalizable superpotential. However such a superpotential will contain terms breaking lepton and baryon number which leads us to the concept of R-parity conservation.

The question of supersymmetry breaking is discussed next. We list the possible soft breaking terms. However the Lagrangian involving the most general soft breaking terms is phenomenologically intractable because of the appearance of many new parameters. It also leads to some unacceptable predictions. To reduce the number of parameters we restrict ourselves to the case with universal soft breaking terms at the GUT scale. We motivate the need for universal soft breaking terms by the apparent unification of gauge couplings in the MSSM and by the absence of flavor changing neutral currents. Then we discuss radiative electroweak symmetry breaking. Radiative breaking arises because the one-loop corrections involving the large top Yukawa coupling change the sign of the soft breaking mass parameter of the up-type Higgs doublet, this way introducing a nontrivial minimum in the Higgs potential.

Finally we give an overview of the possible mixings in the MSSM and enumerate the physical (mass eigenstate) fields together with the mass matrices.
SUPERCOOLING AND NUCLEATION IN PHASE TRANSITIONS OF THE EARLY UNIVERSE
Authors: BANERJEE B. , GAVAI R.V.
Published: October 2004

The three phase transitions (the GUT, the electroweak and the quark-hadron), which the universe is assumed to have undergone, produce very important physical effects if they are assumed to be of first-order. It is also important that enough supercooling is produced at these transitions so that the rate of nucleation of the lower temperature phase out of the higher temperature phase is large. We argue on the basis of finitesize scaling theory that for the quark-hadron and the electroweak phase transitions the universe does not supercool enough to give sizeable nucleation rates. The nucleation probability seems to be significant only for the GUT transition.
CALABI-YAU COMPACTIFICATION OF TYPE-IIB STRING AND A MASS FORMULA OF THE EXTREME BLACK HOLES
Authors: SUZUKI HISAO
Published: October 2004

Recently proposed mechanism of the black hole condensation at conifold singularity in type-II string is an interesting idea from which we can interpret the phase of the universal moduli space of the string vacua. It might also be expected that the true physics is on the conifold singularity after supersymmetry breaking. We derive a mass formula for the extreme black holes caused by the self-dual five-form field strength, which is stable and supersymmetric. It is shown that the formula can be written by the moduli parameters of Calabi-Yau manifold and can be calculated explicitly.
NATURAL SLOW-ROLL INFLATION
Authors: LANGBEIN R.F. , LANGFELD K. , REINHARDT H. , SMEKAL L. von
Published: October 2004

It is shown that the nonperturbative dynamics of a phase change to the nontrivial phase of λφ4-theory in the early universe can give rise to slow-rollover inflation without recourse to unnaturally small couplings.
STARS OF WIMPs
Authors: PISANO F. , TOMAZELLI J.L.
Published: October 2004

A class of boson-fermion stars, whose spin-0 and spin-1/2 constituents interact through a U(1) current-current term in the Lagrangian density, is analyzed. It is shown that it describes the low-energy behavior of a system of weakly interacting massive particles (WIMPs) from the leptonic sector of the minimal supersymmetric standard model. In this case the effective coupling constant λ is related to the Fermi constant G F .
MAGNETIC MOMENTS OF HEAVY BARYONS IN THE SKYRME MODEL
Authors: OH YONGSEOK , PARK BYUNG-YOON
Published: October 2004

We calculate the magnetic moments of heavy baryons in the Skyrme model in the limit of infinite heavy quark mass. We show that the Skyrme model yields the same limit as the nonrelativistic quark model when heavy vector mesons are treated properly. The essential role of the magnetic moment coupling terms in the electromagnetic interactions of heavy mesons is discussed.
FROM PRINCIPAL CHIRAL MODEL TO SELF-DUAL GRAVITY
Authors: PLEBAŃSKI JERZY F. , PRZANOWSKI MACIEJ , GARCÍA-COMPEÁN HUGO
Published: October 2004

It is demonstrated that the action of SU(N) principal chiral model leads in the limit N →∞ to the action for the Park-Husain (P-H) heavenly equation. The principal chiral model in the Hilbert space L 2(ℝ1) is considered and it is shown, that in this case the chiral equation is equivalent to the Moyal deformation of the P-H heavenly equation. A new method of searching for solutions to this latter equation, via Lie algebra representations in L 2(ℝ1) is given.
CONSTRAINTS ON A GENERAL HIGGS SECTOR FROM $K^0 - \tilde K^0$, $B_d - \bar B_d$ MIXING AND THE ε PARAMETER
Authors: CHAKRAVERTY DEBRUPA , KUNDU ANIRBAN
Published: October 2004

The scalar sector of the standard model is extended to include an arbitrary assortment of scalars. In the case where this assignment does not preserve p=1 at the tree-level, the departure from unity itself puts the most stringent constraint on the scalar sector, and where ptree=1 is maintained, useful bounds on the parameter space of the charged Higgs mass and the doublet-nondoublet mixing angle can arise from data on [Formula: see text], [Formula: see text] mixing and the ε parameter. These constraints turn out to be comparable (and in some cases, better) to those obtained from [Formula: see text] data.
EXTREME DYONIC BLACK HOLES IN STRING THEORY
Authors: TSEYTLIN A.A.
Published: October 2004

Supersymmetric extreme dyonic black holes of toroidally compactified heterotic or type-II string theory can be viewed as lower-dimensional images of solitonic strings wound around a compact dimension. We consider conformal sigma models which describe string configurations corresponding to various extreme dyonic black holes in four and five dimensions. These conformal models have regular short-distance region equivalent to a WZW theory with level proportional to magnetic charges. Arguments are presented suggesting a universal relation between the black hole entropy (area) and the statistical entropy of BPS-saturated oscillation states of solitonic string.
ASTROPHYSICAL CONSTRAINTS ON A LIGHT SPINLESS PARTICLE COUPLED TO PHOTONS
Authors: MORI F.
Published: October 2004

We examine further astrophysical constraints on a light spinless particle coupled only to photons and proposed by Massó and Toldra. We consider constraints coming from measurements of extra galactic background and from ionization of HI clouds.
GELFAND–DIKII BRACKETS FOR NONSTANDARD SUPERSYMMETRIC SYSTEMS
Authors: DAS ASHOK , PANDA SUDHAKAR
Published: October 2004

We show how a general nonstandard Lax equation (supersymmetric or otherwise) can be expressed as a standard Lax equation. This enables us to define the Gelfand–Dikii brackets for a nonstandard supersymmetric equation. We discuss the Hamiltonian structures for the nonstandard super KP system and work out explicitly the two Hamiltonian structures of the supersymmetric two-boson system from this point of view.
TWO KINDS OF SYMMETRY BREAKING AND THE PROTON SPIN
Authors: LIN JIN-HU , KIM YONG-DUK
Published: October 2004

We examine flavor symmetry breaking in the generalized Goldberger–Treiman relations and determine the ghost–nucleon coupling constant through the charge symmetry breaking in the Nijmegen NN phase shift analyses. It is shown that direct coupling of the ghost with the nucleon is not negligible. Finally we find the results that satisfy two bounds: |ΔΣ|<0.45, [Formula: see text].
AN EXPLICIT SO(10)×U(1)F MODEL OF THE YUKAWA INTERACTIONS
Authors: ALBRIGHT CARL H. , NANDI SATYANARAYAN
Published: October 2004

We construct an explicit SO (10)× U (1)F model of the Yukawa interactions by using as a guide previous phenomenological results obtained from a bottom-up approach to quark and lepton mass matrices. The U (1)F family symmetry group sets the textures for the Majorana and generic Dirac mass matrices by restricting the type and number of Higgs diagrams which can contribute to each matrix element, while the SO(10) group relates each particular element of the up, down, neutrino and charged lepton Dirac matrices. The Yukawa couplings and vacuum expectation values associated with pairs of 1, 45, 10 and 126 Higgs representations successfully correlate all the quark and lepton masses and mixings in the scenario incorporating the nonadiabatic solar neutrino and atmospheric neutrino depletion effects.
A NEW DERIVATION OF THE COLEMAN–WEINBERG MECHANISM IN MASSLESS SCALAR QED
Authors: MALBOUISSON A.P.C. , NOGUEIRA F.S. , SVAITER N.F.
Published: October 2004

We present a new derivation of the Coleman–Weinberg expression for the effective potential for massless scalar QED. Our result is obtained using the functional integral formalism, without expansions in Feynman graphs. We perform our calculations in the unitary gauge. The first-order character of the phase transition is established.
THE ENTROPY GAP AND THE TIME ASYMMETRY
Authors: AQUILANO ROBERTO , CASTAGNINO MARIO
Published: October 2004

The universe time asymmetry is essentially produced by its low-entropy unstable initial state. Using quantitative arguments P. Davies2 has demonstrated that the universe expansion may produce a decreasing of entropy and, therefore, this fact explains its low-entropy states. This idea is implemented in a qualitative way in a simple homogeneous model. A rough coincidence with observational data is found.
ON THE W-ALGEBRA IN THE CALOGERO–SUTHERLAND MODEL USING EXCHANGE OPERATORS
Authors: NARAYANAN V. , SIVAKUMAR M.
Published: October 2004

We study the W∞-algebra in the Calogero–Sutherland model using the exchange operators. The presence of all the subalgebras of W∞ is shown in this model. A simplified proof for this algebra, in the symmetric ordered basis, is given. It is pointed out that the algebra contains in general, nonlinear terms. This shows that the ordinary W∞-algebra is not present in this model. Possibility of the presence of the nonlinear W∞-algebra is discussed.
CONSISTENT HIGHER DERIVATIVE QUANTUM FIELD THEORY: A MODEL WITHOUT TACHYONS AND GHOSTS
Authors: DE SOUZA DUTRA A. , NATIVIDADE C.P.
Published: October 2004

We present a higher derivative gauge theory in (2 + 1) dimensions which can have its parameters suitably tuned in order to become a consistent quantum field theory, in the sense that both tachyons and ghosts are absent from the particle spectrum of the theory.