bluuebunny/crossref_metadata_2025 huggingface dataset:
ON THE POWER OF TWO-DIMENSIONAL PROCESSOR ARRAYS WITH RECONFIGURABLE BUS SYSTEMS
Authors: OLARIU STEPHAN , SCHWING JAMES L. , ZHANG JINGYUAN
Published: November 2004

Quite recently it has been proved that a two-dimensional processor array with a reconfigurable bus system (PARBS, for short) is at least as powerful as the CRCW shared memory computer. In this note we argue that the well-known PARITY problem can be solved in O(1) time on a two-dimensional PARBS of (n+1)×n processors. Since it is known that PARITY cannot be solved in constant time on a CRCW even if a polynomial number of processors is available, our result shows that the two-dimensional PARBS is strictly more powerful than the CRCW.
AN O(n) PARALLEL ALGORITHM FOR SOLVING THE TRAFFIC CONTROL PROBLEM ON CROSSBAR SWITCH NETWORKS
Authors: SUN K. T. , FU H. C.
Published: November 2004

In this paper, we propose a parallel algorithm for the traffic control problem (an NP-complete problem) on crossbar switch networks. This problem is to find a set of conflict-free paths such that the maximum number of message packets can be transmitted over the network. The problem can be represented by an energy function. Then by applying our parallel algorithm, the state of the energy function is iteratively updated toward a stable state. When the energy function reaches a stable state, the state represents a solution of the problem. The empirical results show that the throughputs of the proposed algorithm are much better than the linear algorithm. We have shown that the time complexity of a parallel algorithm is O(n) by using n2 processors. Furthermore, since the traffic control problem can be reduced to the traveling salesman problem, the proposed algorithm can be further applied to some other NP-complete problems.
COVARIANT OPERATOR FORMALISM OF TWO-DIMENSIONAL TOPOLOGICAL GRAVITY II
Authors: IKEDA NORIAKI
Published: November 2004

Zweibein formalism of two-dimensional topological gravity is formulated in the framework of the manifestly covariant canonical operator formalism. By adopting the new gauge fixing condition, we extend the symmetries of the Lagrangian density, generated by the modified Poincaré-like superalgebra. The intrinsic topological BRS transformation introduced by the previous paper is still the symmetry of the theory.
A DILATON IN TECHNICOLOR
Authors: HALYO E.
Published: November 2004

It is argued that due to spontaneous and anomalous scale symmetry breaking in technicolor there must be a pseudo-Goldstone boson of dilatations in the low energy spectrum of the theory. The technidilaton mass is estimated to be MD≃(7.5/Nr) TeV for a SU (N) TC gauge group with r technifermion doublets. Therefore the existence of a low mass (i.e., MD<1 TeV ) scalar boson will not rule out technicolor.
THE ENERGY-WEIGHTED SUM RULE IN THE NAMBU-JONA-LASINIO MODEL AND THE PROPERTIES OF MESONS (π, π′)
Authors: SOUSA C.A. DE
Published: November 2004

Vacuum and pionic properties are discussed in the context of the NJL model, using the energy-weighted sum rule which is saturated taking into account the contribution of the π(1300) resonance other than the low-lying pionic mode. Although the simplicity of our assumption the method used here establishes a connection between genuine QCD parameters and hadronic quantities. The results are qualitatively in agreement with important conclusions obtained by sophisticated QCD-inspired approaches as the so-called QCD sum rules or chiral perturbation theories.
WEAK SKYRMIONS AS BAGS
Authors: MacKENZIE RICHARD
Published: November 2004

It has been discussed that exotic objects might exist in the familiar Weinberg-Salam model. In particular skyrmions built out of the Higgs sector are examined. It is argued that the presence of fermions may give rise to some intriguing effects, and, indeed, may be responsible for the circumvention of usual arguments for the non-existence of these objects. The existence of a fourth, heavier generation would improve the chances for the existence of such weak skyrmion bags.
MATTER DISTRIBUTION IN A FALSE VACUUM BUBBLE
Authors: LEE CHUL H.
Published: November 2004

The dynamics of matter distribution that may contaminate a false vacuum bubble is considered. In the case of uniform dust distribution, it is shown that the distribution eventually collapses (expands) if the matter energy density is greater (smaller) than twice the false vacuum energy density. The effect of matter distribution on the dynamics of the bubble wall is discussed.
BRST QUANTIZATION OF NULL SPINNING p-BRANES
Authors: GAMBOA J.
Published: November 2004

Using the Batalin-Fradkin-Vilkovisky formalism, we quantize a null spinning p-brane. We observe that the theory is a system of rank 1. We present an explicit expression for the propagator and we conclude that using Weyl ordering for the operators the null spinning p-brane has no critical dimensions. We also discuss how this results can be modified changing the ordering operators prescription. Finally we argue that the functional diffusion equation for the null bosonic p-brane remains valid in the null spinning p-brane case.
QUANTUM NON-LOCAL GRAVITY
Authors: CORNISH N.J.
Published: November 2004

The Lagrangian required to calculate the lowest order quantum corrections to Einstein gravity in the framework of quantum non-local field theory (QNFT) is derived. The non-locally extended BRST gauge-transformations which leave this Lagrangian invariant are also derived.
SO(10) FOR GRAND UNIFICATION?
Authors: TUAN S.F.
Published: November 2004

In this brief review, we present the arguments both theoretical and experimental in favor of the simple group SO(10) as the first approximation towards grand unification. The physical phenomena of the solar neutrino problem which motivate existence of neutrino mass, the recent LEP data which rule out the simple SU(5) (and perhaps supersymmetric SU(5) if tied also to the solar neutrino problem) model for which vanishing neutrino masses would be logical, coupled with attractive features like accommodating the invisible axion and a τ neutrino mass acceptable to cosmology, converge towards a two-step SO(10) model with intermediate mass scale of order 1011 GeV . We comment on the status of a second Z′ in a model of the spontaneous breakdown of SO(10) which is particularly conservative in that very little of the standard picture is altered.
INTEGRABILITY OF THE QUANTUM KdV EQUATION AT c=−2
Authors: DI FRANCESCO P. , MATHIEU P. , SÉNÉCHAL D.
Published: November 2004

We present a simple direct proof of the complete integrability of the quantum KdV equation at c=−2, with an explicit description of all the conservation laws.
DIRECT VERSUS INDIRECT SEARCHES FOR NEUTRALINO DARK MATTER
Authors: BOTTINO A. , DE ALFARO V. , FORNENGO N. , MORALES A. , PUIMEDÓN J. , SCOPEL S.
Published: November 2004

Direct search for neutralino dark matter is analyzed in the framework of the minimal supersymmetric extension of the standard model, using a realistic evaluation of the neutralino relic abundance which also includes radiative corrections to the Higgs masses. Relevance of the present (Ge detectors) experimental data to set constraints on the parameters of the model is discussed and expectations for future experiments which involve neutralino-nucleus coherent processes are investigated. These results are compared to those obtained in a previous paper from indirect search data. In the present analysis particular attention is paid to the theoretical uncertainties due to the different estimates of the Higgs-nucleon coupling strength.
COLORED BRAID MATRICES FROM INFINITE-DIMENSIONAL REPRESENTATIONS OF Uq(g)
Authors: DEGUCHI TETSUO , AKUTSU YASUHIRO
Published: November 2004

From a new infinite-dimensional representation of the universal R-matrix of [Formula: see text], we derive the colored braid matrices which gave generalizations of the multivariable Alexander polynomial. We propose color representations of Uq(g). We construct colored vertex models from the color representations of [Formula: see text].
SEMICLASSICAL CHAOS IN AN x4 ANHARMONIC OSCILLATOR
Authors: ANDERSON J.T.
Published: November 2004

The Zaslavskii criterion for quantum chaos is applied to a quartic anharmonic oscillator with dissipation and an external force term in the semiclassical approximation. The semiclassical equilibrium states and integral invariants are related to quantum states in terms of the ratio of h to the semiclassical action.

Semiclassical chaos is found to occur with the destruction of integral invariants and equilibrium states but the quantum states are not destroyed.
INTERPOLATING STRING FIELD THEORIES
Authors: ZWIEBACH BARTON
Published: November 2004

A minimal area problem imposing different length conditions on open and closed curves is shown to define a one-parameter family of covariant open-closed quantum string field theories. These interpolate from a recently proposed factorizable open-closed theory up to an extended version of Witten’s open string field theory capable of incorporating on shell closed strings. The string diagrams of the latter define a new decomposition of the moduli spaces of Riemann surfaces with punctures and boundaries based on quadratic differentials with both first order and second order poles.
PURSUING THE 17 keV NEUTRINO
Authors: HIME A.
Published: November 2004

Evidence both for and against the existence of a 17 keV neutrino presents an unresolved conundrum. The experimental status is reviewed, emphasizing recent attempts to clarify the issue and thoughts on how the situation might be improved.
BOREL-SUMMABLE PERTURBATION SERIES FOR THEORIES WITH DEGENERATE MINIMA
Authors: AOYAMA HIDEAKI
Published: November 2004

We shed new light on the large-order behavior of the perturbation theory for the quantum mechanics with degenerate minima. The dominant contribution at large-order of perturbation is identified as a bounce-like solution of an effective theory in Euclidean path-integral formalism. Based on this observation, we define an improved perturbation theory, which utilizes the symmetry of the theory. It is shown to yield a Borel-summable series.
KLAUDER’S QUANTIZATION IN THE ALMOST-KAEHLER CASE
Authors: MARANER P. , ONOFRI E. , TECCHIOLLI G.P.
Published: November 2004

We prove that a regularized projection operator on the physical subspace ℋ phys ⊂ℒ2(Ω) can be defined for a symplectic manifold Ω=T*M equipped with an “Almost-Kaehler” structure, provided that a suitable counterterm is added to Klauder’s definition. The present result extends Klauder’s quantization to the case in which geometric quantization requires a real polarization.
A COVARIANT CANONICAL DECOMPOSITION OF THE BOSONIC AND SPINNING EXTENDED OBJECTS WITH ELECTRIC CHARGE
Authors: BARUT A.O. , PAVŠIČ M.
Published: November 2004

By introducing a time-like vector field na (hence a choice of an invariant time parameter τ) the action of a spinning extended object in d dimensions can be covariantly decomposed into the analog of a center of mass part and a space-like internal part. In this way the action has the same form as that of a point particle which is covenient for the interpretation of the theory, its covariant canonical quantization and for the definition of the form factors.
A NUMERICAL TEST OF KPZ SCALING: POTTS MODELS COUPLED TO TWO-DIMENSIONAL QUANTUM GRAVITY
Authors: BAILLIE C.F. , JOHNSTON D.A.
Published: November 2004

We perform Monte-Carlo simulations using the Wolff cluster algorithm of the q=2 (Ising), 3, 4 and q=10 Potts models on dynamical phi-cubed graphs of spherical topology with up to 5000 nodes. We find that the measured critical exponents are in reasonable agreement with those from the exact solution of the Ising model and with those calculated from KPZ scaling for q=3, 4 where no exact solution is available. Using Binder’s cumulant we find that the q=10 Potts model displays a first order phase transition on a dynamical graph, as it does on a fixed lattice. We also examine the internal geometry of the graphs generated in the simulation, finding a linear relationship between ring length probabilities and the central charge of the Potts model.
QUANTUM SUq(2) ALGEBRA: “CARTESIAN” VERSION AND OVERLAPS
Authors: ZHEDANOV A.S.
Published: November 2004

The “Cartesian” form of SUq(2) is found consisting of three generators K1, K2, K3 such that K1 and K2 are Hermitian linear combinations of raising and lowering generators of SUq(2). This version is shown to coincide with Odesskii-Fairlie algebra. Overlap functions between eigenstates of K1 and K2 are expressed via Racah q-polynomials being the q-analogy of Wigner D-function.
MONTE-CARLO ANALYSIS OF THE ABELIAN SURFACE GAUGE MODEL
Authors: BAIG M. , TRIAS A.
Published: November 2004

We present the first numerical results from a lattice formulation of the Abelian surface gauge model which accounts for three-index fields required in theories based on an antisymmetrical potential. For this purpose we have defined a lattice gauge model in such a way that field variables are assigned to the plaquettes and the interaction is defined through elementary three-dimensional cubes. The phase structure of the Abelian Z(2) case has been determined using Monte-Carlo techniques. Duality relations to spin and gauge models are also studied.
PARTON EVOLUTION AND THE NEGATIVE BINOMIAL MULTIPLICITY DISTRIBUTION
Authors: MALAZA E.D. , RITCHIE R.A. , MILLER H.G.
Published: November 2004

Within a semiclassical parton branching model, we derive the evolution equation for the multiplicity distribution in hadron-hadron collisions based on a negative binomial distribution which contains the energy dependence from QCD. We deduce the perturbative QCD form of the shape parameters consistent with data in pp, [Formula: see text] and e+e− experiments.
NON-ANOMALOUS BOSONIZED THEORIES FROM A GAUGE PRINCIPLE
Authors: DUTRA ALVARO DE SOUZA
Published: November 2004

Starting with a gauge principle for a scalar boson we show that one can get, in 1+1 dimensions, the Lagrangian density of the generalized Schwinger model (GSM) in its bosonized version. This occurs for a particular value of the regularization parameter. Then we show how to get the model with the arbitrary parameter through the introduction of the Wess-Zumino field. Finally we study the possible extension of this procedure to higher dimensions, particularly to 2+1 dimensions.
BOUND ON RELIABLE ONE-INSTANTON CROSS-SECTIONS
Authors: VENEZIANO G.
Published: November 2004

Unitarity considerations imply an upper bound on the value of the one-instanton-induced B and L violating cross-section at which multi-instanton contributions become of comparable order. The bound is inversely proportional to a sum of positive-definite terms and, most likely, keeps any reliable one-instanton cross-section exponentially suppressed.
HOOP CONJECTURE IN NONSPHERICAL SELF-GRAVITATING SYSTEMS
Authors: MALEC EDWARD
Published: November 2004

A general framework for the study of the formation of apparent horizons is found. A necessary condition is given in momentarily static nonspherical geometries with non-negative (locally) sectional curvatures. Known results concerning the existence of trapped surfaces are reviewed in a class of conformally flat nonspherical systems.
L−1 CONSTRAINT IN LIOUVILLE GRAVITY
Authors: KITAZAWA Y.
Published: November 2004

We study recursion relations among the amplitudes which involve discrete states in c=1 Liouville gravity on the sphere. We find that the spin J=1/2 discrete state gives rise to the L−1 type recursion relation. Multiple point correlation functions are determined recursively from fewer point functions by this recursion relation. We further point out that the analogs of J=1/2 state exist in c<1 theories coupled to 2D gravity and they also lead to the L−1 type recursion relation.
CLASSICAL VS. LANDAU-GINZBURG GEOMETRY OF COMPACTIFICATION
Authors: BERGLUND PER , GREENE BRIAN , HÜBSCH TRISTAN
Published: November 2004

We consider superstring compactifications where both the classical description, in terms of a Calabi-Yau manifold, and also the quantum theory is known in terms of a Landau-Ginzburg orbifold model. In particular, we study (smooth) Calabi-Yau examples in which there are obstructions to parametrizing all of the complex structure cohomology by polynomial deformations thus requiring the analysis based on exact and spectral sequences. General arguments ensure that the Landau-Ginzburg chiral ring copes with such a situation by having a non-trivial contribution from twisted sectors. Beyond the expected final agreement between the mathematical and physical approaches, we find a direct correspondence between the analysis of each, thus giving a more complete mathematical understanding of twisted sectors. Furthermore, this approach shows that physical reasoning based upon spectral flow arguments for determining the spectrum of Landau-Ginzburg orbifold models finds direct mathematical justification in Koszul complex calculations and also that careful point-field analysis continues to recover surprisingly much of the stringy features.
QUANTUM EFFECTS NEAR A CHARGED BLACK HOLE SINGULARITY
Authors: KRORI K. D. , BORGOHAIN P. , DAS KAR DIPALI
Published: November 2004

We present in this paper an investigation of the problem of quantum fluctuations near a charged black hole singularity. We show that quantum fluctuations do not vanish near the singularity leading to the conclusion that charged black hole singularities are unlikely to occur in nature. This result may be obvious but we derive it here.
DIRECT APPROACH TO PARTIAL ALGEBRAIZATION
Authors: PAZ UZI
Published: November 2004

This paper presents an alternative approach to the method of partial algebraization. This approach does not make any use of Lie symmetries. All Quasi-Exactly-Solvable (QES) problems, constructed by the method presented in Refs. 1–3, can also be constructed in this approach.
PHASE TRANSITION IN $g\varphi^4_2$ THEORY
Authors: EFIMOV G. V. , GANBOLD G.
Published: November 2004

The vacuum stability of a scalar gφ4 theory in two dimensions is studied. A variational approach is applied to estimate the effective potential in this model. We find that the second order phase transition takes place. It is in complete agreement with the Simon-Griffiths theorem.
QCD ANALYSIS OF DEEP INELASTIC LEPTON-NUCLEON SCATTERING DATA
Authors: BILENKAYA S. I. , STAMENOV D. B.
Published: November 2004

A combined next-to-leading order QCD analysis of BCDMS µ H 2 ( D 2) and CDHS [Formula: see text] scattering data is presented. The nucleon structure functions are given in terms of parton distributions. Unlike most of the papers on this subject, the cross-section scattering data (not the values for the nucleon structure functions extracted from these data by additional extrapolations and assumptions) are fitted. A very good agreement of the data with the predictions of QCD for the parton distributions is observed. The QCD mass scale parameter Λ is determined from these data both in a flavor nonsinglet approximation and with a complete flavor singlet and non-singlet treatment. These two fits to the data give consistent results for Λ.
PROBING THE HIGGS SECTOR OF THE MINIMAL SUPERSYMMETRIC STANDARD MODEL AT e+e− COLLIDERS
Authors: YAMADA ATSUSHI
Published: November 2004

The ability of future e+e− colliders to study the supersymmetric Higgs sector is examined. The effects of the radiative corrections are included. A global analysis is given for the production cross-sections of the neutral Higgs bosons over the full parameter space of the Higgs sector, which clarifies the integrated luminosity necessary for the detection of the neutral Higgs bosons. The branching ratios of the three neutral Higgs bosons are also computed.
MAGNETIC STATES IN 48Ca AND THE TENSOR PART OF THE RESIDUAL NUCLEON-NUCLEON INTERACTION
Authors: AMARO J. ENRIQUE , LALLENA ANTONIO M.
Published: November 2004

The residual nucleon-nucleon interaction is investigated by analyzing the electromagnetic transitions to some magnetic states of 48Ca in the RPA framework. In particular the strength of the tensor part of the interaction is studied by comparing the calculated results with the available experimental information. It is found that the tensor force, as given by the (π+ρ)-exchange model, must be reduced by a factor between 30 and 60%. This result, when compared with the ~60% reduction factor found for 208 Pb , shows a certain dependence on the nucleus.
LONG DISTANCE EFFECTS, PENGUIN CONTRIBUTION AND CP VIOLATION IN $K^0 - \bar K^0 $
Authors: TERASAKI K. , ONEDA S.
Published: November 2004

We estimate the fractional contribution of the Penguin term to the most important asymptotic ground state meson matrix elements of H w by fitting the calculated KS→π+π− decay rate and KL-KS mass difference to their observed values and show that the Penguin contribution does not play a dominant role for the |Δ I | = ½ rule. We then discuss long distance effects on the CP violation in the [Formula: see text] mixing by using the estimated fraction.
QUANTUM MECHANICAL GALILEI GROUP AND Q-PLANES
Authors: DJEMAI A.E.F.
Published: November 2004

In this work, we show that for a particular choice of translations in the phase space in the context of quantum mechanics, we get a Manin plane. In this framework, we construct the quantum mechanical Galilei group.
TOPOLOGICAL CONFORMAL ALGEBRA IN POLYAKOV’S LIGHT-CONE GAUGE GRAVITY
Authors: YAMADA KIYONORI
Published: November 2004

We show that the two-dimensional gravity coupled to c=−2 matter field in Polyakov’s light-cone gauge has a twisted N=2 superconformal algebra. We also show that the BRST cohomology in the light-cone gauge actually coincides with that in the conformal gauge. Based on this observation the relations between the topological algebras are discussed.
WHY IS TOP HEAVIER THAN BOTTOM? YUKAWA AND MASS UNIFICATION IN SUSY MODEL
Authors: BANDO MASAKO , KUGO TAICHIRO , MAEKAWA NOBUHIRO , NAKANO HIROAKI
Published: November 2004

We examine whether the unification constraints on the Yukawa couplings and on the Higgs masses in the minimal supersymmetric Standard Model can be consistent with the observed mass pattern of the third generation fermions. The effects of the QCD interaction and the SU(2)R breaking owing to the U(1) Y gauge interaction and the absence of ντR are crucial. We observe that the parameter choice of “no-scale” supergravity is favored and the SUSY breaking scale has a lower bound, in order for the top quark to be much heavier than the bottom quark.
EXTENDED FORM METHOD OF ANTIFIELD-BRST FORMALISM FOR BF THEORIES
Authors: IKEMORI HITOSHI
Published: November 2004

The Batalin-Vilkovisky antifield action for the BF theories is constructed by means of the extended form method. The BRST invariant BV antifield action is directly written down by making use of the extended forms that involve all the required ghosts and antifields.
PHYSICAL DEGREES OF FREEDOM IN 2D STRING FIELD THEORIES
Authors: SAKAI NORISUKE , TANII YOSHIAKI
Published: November 2004

States in the absolute (semi-relative) cohomology but not in the relative cohomology are examined through the component decomposition of the string field theory action for the 2D string. It is found that they are auxiliary fields without kinetic terms, but are important for instance in the master equation for the Ward-Takahashi identities. The ghost structure is analyzed in the Siegel gauge, but it is noted that the absolute (semi-relative) cohomology states are lost.
SPECTRA IN CONFORMAL FIELD THEORIES FROM THE ROGERS DILOGARITHM
Authors: KUNIBA A. , NAKANISHI T.
Published: November 2004

We propose a system of functional relations having a universal form connected to the [Formula: see text] Bethe ansatz equation. Based on the analysis of it, we conjecture a new sum formula for the Rogers dilogarithm function in terms of the scaling dimensions of the [Formula: see text] parafermion conformal field theory.
TEMPORAL DESCRIPTION OF THERMAL QUANTUM FIELDS
Authors: UMEZAWA H. , YAMANAKA Y.
Published: November 2004

By making use of time-dependent Bogoliubov transformations, we develop a calculation technique for time-dependent non-equilibrium systems of quantum fields in a time-representation (t-representation). The corrected one-body propagator in the t-representation turns out to have the form B−1 (diagonal matrix) B (B being a thermal Bogoliubov matrix). Applying the usual on-shell concept to the diagonal matrix part of the self-energy, we formulate a self-consistent renormalization scheme. This renormalization determines the vacuum and leads to a kinetic equation for the number density parameter, which reduces to the Boltzmann equation in the lowest approximation. This gives us the increasing entropy in time (the second law of thermodynamics).
ON THE RELATION BETWEEN INDUCED QUANTUM GRAVITY AND JACKIW-TEITELBOIM GRAVITY IN TWO DIMENSIONS
Authors: BERGER THILO
Published: November 2004

Jackiw-Teitelboim gravity in the presence of matter fields is studied by using the conformal gauge. It is shown to be equivalent to induced Polyakov gravity in a Weyl invariant formulation. The gravitational action for the vacuum plays the role of a gauge fixing term.
TWO-POLE ANALYSIS OF NARROW STRUCTURES IN KEK pp-Ay, RELATED WITH pp-pp, πd-πd AND pp-πd OBSERVABLES
Authors: NAGATA J. , YOSHINO H. , MATSUDA M. , HIROSHIGE N. , UEDA T.
Published: November 2004

Narrow structures in KEK pp-Ay data at [Formula: see text] and 2.19 GeV, are analyzed in order to identify the partial waves which generate these narrow structures. The structureless data on pp-dσ/dΩ(90°) from Saclay are also taken into account. As possible candidates, we find the 3F3 or 3H5 state for the structure at 2.16 GeV, and the 1G4, 3P1, 3F4or 4H5 state for the structure at 2.19 GeV. For further selection of solutions, we propose efficient observables in pp-pp, πd-πd and pp-πd processes.
COSMOLOGICAL COMPACTIFICATION OF SUPERSTRINGS WITH DYNAMICAL DILATON FIELD IN FOUR DIMENSIONS
Authors: MAJUMDAR A.S. , MUKHERJEE A. , SAXENA R.P.
Published: November 2004

The cosmological compactification of D=10, N=1 supergravity-super-Yang-Mills theory is studied. On requiring supersymmetry and the existence of a dynamical dilaton field in four dimensions, non-trivial evolution for the scale factor is obtained.
A BRIEF CRITIQUE OF THE SEARCH FOR NEUTRINO OSCILLATIONS WITH “SINGLE MEASUREMENT” SOLAR NEUTRINO EXPERIMENTS
Authors: CLINE DAVID B. , CHENG MAO-TUNG
Published: November 2004

We briefly review the recent results on solar neutrino observations pointing out the dependence on the model of the solar neutrino production. We show that current uncertainties make it rather unlikely that unambiguous proof of neutrino oscillations can be obtained from any current (single measurement) techniques. We then show the importance of carrying out solar neutrino experiments where two reactions are measured simultaneously (double experiments). As an example we apply this to the ICARUS liquid Argon detector being constructed for the Gran Sasso Laboratory.
DETERMINATION OF THE TOP QUARK AND HIGGS BOSON MASSES
Authors: DECKER ROGER , PESTIEAU JEAN
Published: November 2004

In this paper we discuss the possibility of predicting unknown parameters (mt and Mh) of the electroweak theory by postulating that some one-loop corrections are finite.
THE EFFECTIVE LAGRANGIAN APPROACH TO THE "PROTON-SPIN PUZZLE" AND THE ISSUE OF "TWO COMPONENTS"
Authors: SCHECHTER J. , SONI V. , SUBBARAMAN A. , WEIGEL H.
Published: November 2004

The "proton-spin puzzle" is examined from the effective Lagrangian point of view. A generalized (to include "short distance" information) Skyrme model is shown to give a satisfactory picture. We then examine the question of the breakup of the axial singlet matrix element into "matter" and "glue" pieces in this framework.
BOSONIZATION OF NON-RELATIVISTIC FERMIONS AND W-INFINITY ALGEBRA
Authors: DAS SUMIT R. , DHAR AVINASH , MANDAL GAUTAM , WADIA SPENTA R.
Published: November 2004

We discuss the bosonization of non-relativistic fermions in one-space dimension in terms of bilocal operators which are naturally related to the generators of W-infinity algebra. The resulting system is analogous to the problem of a spin in a magnetic field for the group W-infinity. The new dynamical variables turn out to be W-infinity group elements valued in the coset W-infinity/H where H is a Cartan subalgebra. A classical action with an H gauge invariance is presented. This action is three-dimensional. It turns out to be similar to the action that describes the color degrees of freedom of a Yang–Mills particle in a fixed external field. We also discuss the relation of this action with the one recently arrived at in the Euclidean continuation of the theory using different coordinates.
IS A 17 keV NEUTRINO COMPATIBLE WITH SUPERNOVA AND NUCLEOSYNTHESIS CONSTRAINTS?
Authors: ROTHSTEIN I. Z.
Published: November 2004

In this article I review the work done on accommodating a 17 keV neutrino. Special emphasis is paid to supernova and big-bang nucleosynthesis constraints since, when in tandem, they are particularly insidious. It is shown that a 17 keV neutrino is compatible with the constraints, but that it is necessary to go well beyond the standard model to evade them.
GENERALIZED COSET CONSTRUCTION AND CONSTRAINED FERMIONIC MODELS
Authors: CABRA D. , MORENO E. , SCHAPOSNIK F. A.
Published: November 2004

We present a path-integral formulation of two-dimensional constrained fermionic models which correspond to a generalized coset construction G=Hn/Hn-1/…/H1 for a descending chain of groups Hn⊃Hn-1⊃…⊃H1.
STOCHASTIC METHOD AND BARYON NUMBER VIOLATION IN THE STANDARD MODEL
Authors: SINGH LAMBODAR PRASAD
Published: November 2004

A stochastic picture of the baryon number violation in the standard model is presented. The earlier results have been reproduced and clarified.
NATURAL HIERARCHICAL FLAVOR MIXING
Authors: LEMKE E. H.
Published: November 2004

We consider standard fermion doublets and Dirac fermions within the framework of a radiative mechanism of mass generation. The mass matrix represents a solution of a multi-gap equation. Taking such a solution, we compute the mass matrix of the upper (lower) members of the doublets with respect to the basis where the lower (upper) members have a mass matrix that is flavor-diagonal. If this form lies in the vicinity of its diagonalized mass matrix, the mixing will be called "natural." Naturalness relations between the products of mixing angles and ratios of flavor masses result. They are of substantial predictive power in both the case of the quarks and the leptons.
DEFORMED CONFORMAL AND SUPERSYMMETRIC QUANTUM MECHANICS
Authors: SPIRIDONOV VYACHESLAV
Published: November 2004

Within the standard quantum mechanics a q-deformation of the simplest N=2 supersymmetry algebra is suggested. Resulting physical systems do not have conserved charges and degeneracies in the spectra. Instead, superpartner Hamiltonians are q-isospectral, i.e., the spectrum of one can be obtained from another (with possible exception of the lowest level) by the q2-factor scaling. A special class of the self-similar potentials is shown to obey the dynamical conformal symmetry algebra su q(1,1). These potentials exhibit exponential spectra and corresponding raising and lowering operators satisfy the q-deformed harmonic oscillator algebra of Biedenharn and Macfarlane.
ATOMIC TRANSITIONS IN q-DEFORMED FIELDS
Authors: AGARWAL G. S. , CHATURVEDI S.
Published: November 2004

Unusual probabilities of absorption and emission of quons by an atomic medium are reported. The deviations from the usual atomic transition probabilities can be used as an evidence for quons if they were to exist and were to interact with matter.
CLASSICAL AND QUANTAL CHAOS IN THE COLLECTIVE DYNAMICS OF NUCLEI
Authors: ALHASSID Y. , WHELAN N. , NOVOSELSKY A.
Published: November 2004

The onset of chaos in the collective dynamics of nuclei is studied in the framework of the interacting boson model. Classical chaos is measured throughout the general parameter space of the Hamiltonian. Analysis of quantal fluctuations of the spectrum and of the electromagnetic B(E2) intensities show strong correlations with the classical results.
HOW DOES GLUON STRING SPLIT INTO TWO QUARK ONES?
Authors: GURVICH E. G. , LEPTOUKH G. G.
Published: November 2004

We assume that gluon string splits into two quark ones not instantaneously but via creation of the so-called zip-antizip pairs along the gluon string. This additional stage prolongs hadronization process and gives the novel source of fluctuations that softens hadron z-spectrum and widens the multiplicity distribution.
π0 DECAY AT CRITICAL TEMPERATURE
Authors: BI PIN-ZHEN , RAFELSKI JOHANN
Published: November 2004

The influence of temperature on the pion decay constant and the two-photon decay of π0 is considered near the chiral symmetry restoration point. We analyze how the mass and decay width relate to each other and find that the π0 decay width in hot matter is suppressed, provided that the pion mass vanishes at the critical point; it diverges if pion mass remains finite while quark condensate is dissolved at T c .
INDUCED PARITY-VIOLATION ANOMALY FOR A SPIN-3/2 FIELD IN THREE DIMENSIONS
Authors: DO NASCIMENTO J. R. S. , BEZERRA DE MELLO E. R.
Published: November 2004

A diagrammatic computation of the parity-violating effective action for the massless Rarita-Schwinger field induced by its interaction with a spin 0 and 1/2 fields is presented. The lowest-order approximation is compared with the Chern-Simons term previously obtained for the spinor-vector field.
LANDAU GROUND STATE ON RIEMANNIAN SURFACES
Authors: MARANER P.
Published: November 2004

We study the ground state of a particle moving on an even-dimensional Riemannian manifold (M,gμν) under the action of a nondegenerate magnetic field Bμν in the hypothesis that the metric and the symplectic two-form provided by B, define a conformal Kähler structure on M. On a Riemannian surface the Hamiltonian [Formula: see text] has always a degenerate ground state and in the compact case its degeneration is equal to the volume of the surface in ℏ units minus one half the Euler-Poincaré characteristic.
POTENTIAL BAGS
Authors: FERREIRA P. LEAL , TOMIO LAURO
Published: November 2004

Relativistic confining potential models, endowed with bag constants associated to volume energy terms, are investigated. In contrast to the usual bag model, these potential bags are distinguished by having smeared bag surfaces. Based on the dynamical assumptions underlying the fuzzy bag model, these bag constants are derived from the corresponding energy-momentum tensor. Explicit expressions for the single-quark energies and for the nucleon bag constant are obtained by means of an improved analytical version of the saddle-point variational method for the Dirac equation with confining power-law potentials of the scalar plus vector (S+V) or pure scalar (S) type.
Nn(n–1)/2-STATE INTERTWINER RELATED TO Uq(sl(n)) ALGEBRA AT q2N=1
Authors: KASHAEV R. M. , MANGAZEEV V. V.
Published: November 2004

The Nn(n–1)/2-state R-matrix related to U q( sl (n)) algebra at q2N=1 is presented. Its matrix elements are interpreted as Boltzmann weights of an elementary box of some 2D lattice statistical model and given in terms of [Formula: see text] weights of the "minimal" sl (n) chiral Potts model. The corresponding family of transfer matrices depends on n rapidity variables living on high genus algebraic curves, the latter being defined by n moduli. The Yang-Baxter equation is conjectured to hold.
A NEW CONSTRUCTION OF THE PENNER MODEL
Authors: SREDNICKI MARK
Published: November 2004

The free energy of the Penner model is shown to be closely related to the integral over the two diagonalizing unitary matrices of a complex rectangular matrix.
STRINGY EFFECTS ON SUPERSYMMETRY BREAKING IN LOW ENERGY SUPERGRAVITY THEORIES
Authors: SENGUPTA SOUMITRA , MAJUMDAR PARTHASARATHI
Published: November 2004

The possibility of soft supersymmetry breaking at the tree level of string-inspired low energy supergravity theory is investigated. It is shown that the stringy quantum effects like the world sheet instanton and string loop effects can induce soft supersymmetry breakings at the tree level of the observable sector. Generic mass terms and trilinear soft breaking terms that arise are calculated.
THE FOUR-DIMENSIONAL INFLATIONARY AND FRIEDMANNIAN COSMOLOGIES FROM ANY TYPE OF 10D SUPERSTRINGS
Authors: BYTSENKO A.A. , GONCHAROV YU. P.
Published: November 2004

We develop a generic scheme for building both inflationary and Friedmannian cosmologies in the context of 10D superstring theories and concretize it by using the example of a spacetime manifold with a toroidal topology. It is shown that a 10D superstring of any type can contain all the necessary ingredients for building either scenario.
EFFECTIVE N=1 SUPERGRAVITIES IN TWO DIMENSIONS
Authors: AOYAMA S.
Published: November 2004

We discuss the effective (1, 0), (0, 1) and (1, 1) supergravities both in the light-cone gauge and geometrical formulations. It will be shown that the two formulations are related to each other by a certain change of the variable. In the latter formulation the effective gravities will manifest various symmetries which suggest a close relationship to the WZWN model. Indeed the effective (1, 0), (0, 1) and (1, 1) supergravities are interpreted by the corresponding super WZWN models with the SL (2, R) group.
NEW SOLUTIONS OF THE YANG-BAXTER EQUATION AND THEIR YANG-BAXTERIZATION
Authors: COUTURE M. , CHENG Y. , GE M.L. , XUE K.
Published: November 2004

Through the examples associated with simple Lie algebras B2, C2 and D2, an approach of constructing new solutions of the spectral-independent Yang-Baxter equation (i.e. the braid group representations) was shown. These new solutions possess some particular features, such as that they do not have the classical limit in the usual sense of Refs. 2, 5, etc., and give rise to the new solutions of the x-dependent Yang-Baxter equation by using the Yang-Baxterization prescription.
FOCK SPACE REPRESENTATIONS OF THE ALGEBRA OF DIFFEOMORPHISMS OF THE n-TORUS
Authors: FIGUEIRIDO FRANCISCO , RAMOS EDUARDO
Published: November 2004

As a first step in the construction of quantum field theories invariant under the group of diffeomorphisms, we obtain Fock space representations of the algebra of vector fields of the n-torus. These representations have the novel feature of being carried by bilinear forms rather than operators. Nevertheless all the usual manipulations can be defined via a suitable regularization procedure. Our approach is a generalization of Kac-Peterson’s method for Diff (S1) which allows us to explicitly construct “quantum fields” transforming as “classical” tensors.
INCLUSIVE PRODUCTION IN THE CENTRAL REGION: CONNECTION WITH THE ELASTIC AMPLITUDE
Authors: LIKHODED A.K. , YUSHCHENKO O.P.
Published: November 2004

It is shown that on the basis of the two-reggeon approach, neglecting strong graphs and using three leading Regge singularities with Δ>0, Δ=0 and Δ<0, it is possible to have a good data description in wide intervals of energy and rapidities. This description is connected with that of the elastic amplitude.
MANY SUCCESSIVE MEASUREMENTS AND EXPONENTIAL DECAY
Authors: URBANOWSKI K.
Published: November 2004

A multiple repeated measurement of the unstable state evolving in time is discussed. We show that there is no decay in the limit of continuous measurements and there is a purely exponential decay law in other cases. We also give formulae for the effective decay width in the cases of very short, intermediate, relatively long and very long time intervals separating successive measurements. Our results are compared with the Weisskopf-Wigner formula for weak decays. Based on our model of a measurement, we show that the decay width does not depend on properties of the real detectors in practice.
STRANGENESS AND QUARK GLUON PLASMA: ASPECTS OF THEORY AND EXPERIMENT
Authors: EGGERS HANS C. , RAFELSKI JOHANN
Published: November 2004

A survey of our current understanding of the strange particle signature of quark gluon plasma is presented. Emphasis is placed on the theory of strangeness production in the plasma and recent pertinent experimental results. Useful results on spectra of thermal particles are given.
GENERALIZED CANONICAL QUANTIZATION OF BOSONIC STRING IN BACKGROUND FIELDS
Authors: BUCHBINDER I.L. , FRADKIN E.S. , LYAKHOVICH S.L. , PERSHIN V.D.
Published: November 2004

The theory of a closed bosonic string interacting with background fields, namely, with metric, antisymmetric tensor of second rank and dilaton, is considered. The classical formulation of the constrained theory is developed and the canonical quantization is carried out. The combined symbols of the Virasoro operators corresponding to the Weyl ordering of zero string modes and to the Wick ordering of oscillating ones are constructed. The quantum Virasoro algebra is formulated by means of star-commutators corresponding to these symbols and the nonlocal first quantum correction in the algebra is calculated. The local part of the correction linear in curvature is derived and effective equations of motion for background fields are obtained in the lowest order.
IS THERE A STATISTICS TRANSMUTATION DUE TO INTERACTION WITH THE CHERN-SIMONS FIELD?
Authors: NANOBASHVILI G.G. , PRON’KO G.P.
Published: November 2004

The classical mechanics of a scalar particle interacting with a Chern-Simons field in the (2+1)-dimensional space-time has been considered. The geometric quantization of this system does not lead to particle statistics transmutation. This result is in apparent contradiction with the statement of Ref. 1.
BORDERED RIEMANN SURFACES, SCHOTTKY GROUPS AND OFF-SHELL STRING AMPLITUDES
Authors: MARTÍN-DELGADO M.A. , RAMÍREZ MITTELBRUNN J.
Published: November 2004

We propose an off-shell extension of the closed bosonic string scattering amplitudes as functional integrals over bordered Riemann surfaces. The tree level off-shell N-scalars amplitude is handled with the help of Schottky groups and the Burnside θ-series. Using these tools and the asymptotic behaviour of the partition function at the boundary of the moduli space, we show that the off-shell amplitudes exhibit the tachyon mass-shell poles in the external momenta. In addition, their residues are shown to be the semi-off-shell amplitudes and the well-known Koba-Nielsen amplitudes.
ASYMPTOTIC FREEDOM VERSUS ASYMPTOTIC FINITENESS
Authors: ODINTSOV S.D. , SHAPIRO I.L. , TOMS D.J.
Published: November 2004

Gauge theories based upon a direct product G1×G2 of two gauge theories are considered. We examine the general features of models where the theory based upon G1 is asymptotically finite and that based upon G2 is asymptotically free. A simple model in which the product theory is asymptotically finite is presented.
SIMULATING QUANTUM PARTICLES IN NON-SIMPLY-CONNECTED SPACE
Authors: GROZIN A.G.
Published: November 2004

The usual simulation methods are inapplicable for a particle in a non-simply-connected space, because closed paths are divided into homotopy classes. The probability distribution over these classes is calculated analytically at low temperatures. A simulation algorithm is proposed.
NEUTRINO “SPIN ROTATION” IN A TWISTING MAGNETIC FIELD
Authors: ANEZIRIS C. , SCHECHTER J.
Published: November 2004

We calculate in a simple model the reduction in probability for (say) an electron neutrino to rotate to another state in a transverse magnetic field when that field twists in the transverse plane. This may be of relevance to a “second generation” analysis of solar neutrinos. Connection with the Berry phase for this problem is also discussed.
SINGULAR SUPERPOTENTIALS AND EXPLICIT BREAKING OF SUPERSYMMETRY
Authors: CASAHORRAN JAVIER , NAM SOONKEON
Published: November 2004

We describe a method of generating a family of supersymmetric quantum mechanics models depending on two positive integers (l,j), l>j. All of them exhibit singular superpotentials, explicit breaking of supersymmetry, a normalizable zero mode and j eigenstates with negative energy. We discuss the nodal structure of the solutions to the two supersymmetric partner Schrödinger equations. If we fix j=1, the two Hamiltonians H − and H + include Pöschl-Teller potentials and under these circumstances the problem is solvable. Maintaining j=1, but now letting l ∈ (−∞, ∞), we find a model similar to the ones which have been considered in the literature.
MAGNETIC MONOPOLES AND THE YANG-BAXTER EQUATIONS
Authors: Atiyah Michael
Published: November 2004

A comparison is made between the new solutions of the Yang-Baxter equations, arising from curves of higher genus, and magnetic monopoles of higher charge. It is shown that essentially the same algebraic curves arise in both cases, and this leads to speculations about possibly more general solutions of the Yang-Baxter equations.
TOPOLOGICAL QUANTUM FIELD THEORIES AND GAUGE INVARIANCE IN STOCHASTIC QUANTIZATION
Authors: Baulieu Laurent
Published: November 2004

The Langevin equations describing the quantization of gauge theories have a geometrical structure. We show that stochastically quantized gauge theories are governed by a single differential operator. The latter combines supersymmetry and ordinary gauge transformations. Quantum field theory can be defined on the basis of a Hamiltonian of the type [Formula: see text], where Q has has deep relationship with the conserved BRST charge of a topological gauge theory, and [Formula: see text] is its adjoint. We display the examples of Yang-Mills theory and of 2D gravity. Interesting applications are for first order actions, in particular for the theories defined by the three dimensional Chern Simons action as well as the “two dimensional” ∫M2TrϕF.
THE BACKGROUND FIELD METHOD AND THE ANOMALIES OF THE HETEROTIC σ-MODEL IN A CURVED (1, 0) SUPERSPACE
Authors: KETOV S.V. , SOLOVIEV O.A.
Published: November 2004

The covariant (in the σ-model sense) background field method for calculating the anomalies of the heterotic string propagating on the background of its massless modes is developed in a curved superspace of the two-dimensional (1, 0) supergravity. As the massless background fields, we use a metric, an antisymmetric tensor, a dilaton and gauge bosons. Explicit calculation of the anomalies up to five loops is performed and the results are found to be in agreement with the known facts about the heterotic string low-energy effective action. The dilaton-dependent corrections to the anomalies at the two- and three-loop levels are shown to be absent.
A QUANTUM LORENTZ GROUP
Authors: CAROW-WATAMURA U. , SCHLIEKER M. , SCHOLL M. , WATAMURA S.
Published: November 2004

We examine the properties of the quantum Lorentz group SO q(3, 1) using the [Formula: see text] matrix given in Ref. 14. We show that this matrix together with the q-deformed metric C provide a representation of a BWM algebra. Using the projection operators which decompose the [Formula: see text] matrix into irreducible components, we give the general definition of the corresponding quantum space, i.e. the q-deformed Minkowski space and the q-deformed Clifford algebra. We also construct the q analog of Dirac matrices and show that they form a matrix representation of the q-deformed Clifford algebra.
EXPLICIT EXCHANGE RELATIONS IN THE SL(2) WESS-ZUMINO-NOVIKOV-WITTEN MODEL
Authors: ITOH TAKASHI , YAMADA YASUHIKO
Published: November 2004

We discuss, in the SL(2) Wess-Zumino-Novikov-Witten model, the quantum exchange relations for chiral vertex operators with arbitrary spin by using a free-field realization. We give a recursion formula for the monodromy matrices and the solution explicitly. They coincide with the q-6j symbol of the relevant quantum group Uq(sl(2)) .
EXPERIMENTAL DETERMINATION OF THE QUARK MIXING ANGLES
Authors: CASTRO G. LÓPEZ
Published: November 2004

We review the current status of the determination of the quark mixing angles |Vqq′|, where q=u, c; q′=d, s, b. We consider essentially exclusive decay processes, taking into account the main sources of uncertainties, the available calculations of flavor symmetry breaking for hadronic matrix elements and the possibilities of improvement offered by new experimental results.

In some cases we provide full expressions for |Vqq′| in terms of measurable decay properties, which can be useful for new experimental data. Finally, we discuss briefly the effects on the unitarity tests of the Cabibbo-Kobayashi-Maskawa matrix when we consider recent corrections to the determination of |Vud|.