bluuebunny/crossref_metadata_2025 huggingface dataset:
CRITICAL BEHAVIOR IN TWO-DIMENSIONAL QUANTUM GRAVITY AND EQUATIONS OF MOTION OF THE STRING
Authors: DAS SUMIT R. , DHAR AVINASH , WADIA SPENTA R.
Published: November 2004

We show how consistent quantization determines the renormalization of couplings in a quantum field theory coupled to gravity in two dimensions. The special status of couplings corresponding to conformally invariant matter is discussed. In string theory, where the dynamical degree of freedom of the two-dimensional metric plays the role of time in target space, these renormalization group equations are themselves the classical equations of motion. Time independent solutions, like classical vacuua, correspond to the situation in which matter is conformally invariant. Time dependent solutions, like tunnelling configurations between vacuua, correspond to special trajectories in theory space. We discuss an example of such a trajectory in the space containing the c < 1 minimal models. We also discuss the connection between this work and the recent attempts to construct non-perturbative string theories based on matrix models.
SUPER SCHWARZIAN DERIVATIVES IN N = 4 SU(2)-EXTENDED SUPERCONFORMAL ALGEBRAS
Authors: MATSUDA SATOSHI , UEMATSU TSUNEO
Published: November 2004

We investigate anomalous terms in finite superconformal transformations in N = 4 SU(2)-extended superconformal algebras (SCA). Based on the superspace formalism we obtain super Schwarzian derivatives for the N = 4 SCA. Solutions for global superconformal transformations with the vanishing super-Schwarzian derivatives are given.
CRITICAL BEHAVIOR IN SOME D = 1 LARGE-N MATRIX MODELS
Authors: DAS SUMIT R. , DHAR AVINASH , SENGUPTA ANIRVAN M. , WADIA SPENTA R.
Published: November 2004

We study the critical behavior in D = 1 large-N matrix models with potentials of the form V(M) = ΣkN1−kgk tr (M2k) for hermitian matrices, and also those of the form [Formula: see text] for the unitary matrices. For the planar theory, both cases show multicritical points characterized by an integer m ≥ 2 with [Formula: see text] and [Formula: see text]. We also look at the subleading terms in susceptibility in order to find out the dimensions of some of the operators in the theory. The question of identification for m > 2, however, remains unsettled.
THE DOMINANT PART OF HIGHER ORDER CORRECTIONS FOR THE SUBPROCESS qg → γq
Authors: CONTOGOURIS A. P. , PAPADOPOULOS S.
Published: November 2004

Earlier work has shown that in processes involving structure functions and/or fragmentation functions initiated by 2 → 2 parton subprocesses there is a gauge invariant part that dominates higher order corrections, and for the gluon Bremsstrahlung contributions to this part simple and general expressions were derived and applied to [Formula: see text]. Here we apply these expressions and determine the dominant part of qg → γq, thus complementing the work and demonstrating the efficiency of the approach.
GENERALIZED SELF-DUAL BOSONIC p-BRANES AND INSTANTON-LIKE SOLUTIONS
Authors: ZAIKOV R. P.
Published: November 2004

The self-dual classical bosonic p-branes are generalized for D = (p + 1) q dimensional space-time. When q > 1, the action is no more pure gauge. Some instanton-like solutions of the self-duality equations which minimize the Euclidean action are discussed.
CANONICAL PHASE, TOPOLOGICAL INVARIANT AND REPRESENTATION THEORY
Authors: KURATSUJI HIROSHI , TAKADA KEN-ICHI
Published: November 2004

We show that the non-integrable phase defined over the generalized phase space, which is called the canonical phase, yields the topological quantization that reveals the connection with the irreducible representation of a certain class of compact Lie groups. Although this consequence by itself is already known in mathematics under the general scheme named geometric quantization, it has not yet been fully appreciated in physics except for some specific problems. The descriptive technique adopted here seems fresh enough to commit itself to the topological aspect of quantum mechanics even including quantum field theory.
ON THE BRST APPROACH TO TWO-DIMENSIONAL GAUGE THEORIES IN THE LIGHT-CONE GAUGE
Authors: TANII YOSHIAKI
Published: November 2004

The physical meaning of the second BRST-like charge, which exists in addition to the ordinary BRST charge in two-dimensional gauge theories in the light-cone gauge, is clarified. It results from the redundancy of the parametrization of the gauge field in terms of a group-valued scalar field and has a similar structure to the ordinary one.
DE SITTER GRAVITY AND SUPERGRAVITY IN THREE DIMENSIONS AS CHERN-SIMONS THEORIES
Authors: KOEHLER K. , MANSOURI F. , VAZ CENALO , WITTEN L.
Published: November 2004

We construct a de Sitter supergravity theory in 2 + 1 dimensions as the Chern-Simons gauge theory of the supergroup OSp (1|2; C). The resulting action is a consistent classical supergravity theory with a positive cosmological constant. As in other three dimensional Chern-Simons theories, diffeomorphisms are shown to be equivalent to gauge transformations of OSp (1|2; C) on shell. Consistency of the corresponding classical theory is briefly discussed.
CLASSIFICATION OF EXACTLY SOLVABLE DENSITIES FOR TWO-NEUTRINO OSCILLATIONS IN MATTER
Authors: BYCHUK O. V. , SPIRIDONOV V. P.
Published: November 2004

We list out all the electron densities leading to the MSW-oscillation probabilities for two-neutrino states which can be expressed via hypergeometric functions. Generally there are only six such density types, though near the resonance point or in the case of maximum mixing angle the situation is much more complex.
ZERO MODES IN VORTEX-FERMION SYSTEM WITH COMPACT EXTRA SPACE
Authors: NAKAMURA A. , SHIRAISHI K.
Published: November 2004

The existence of fermionic zero modes is shown in the presence of vortex configuration of pure SU(2) gauge field on the manifold M4 × S2. From the perspective of four-dimensional effective theory, these zero modes are almost the same as the Jackiw-Rossi type zero modes of the vortex-fermion system.
MOMENTS OF THE SPIN-DEPENDENT PROTON STRUCTURE FUNCTION
Authors: INDUMATHI D. , MURTHY M. V. N. , RAVINDRAN V.
Published: November 2004

We discuss the moments of the recently measured spin-dependent structure function, [Formula: see text], of the proton. Using the operator product expansion and an effective equation of motion, we show that the third moment can be related to the first moment.
EQUIVALENCE OF TWO-DIMENSIONAL GRAVITIES
Authors: MOHAMMEDI NOUREDDINE
Published: November 2004

We find the relationship between the Jackiw-Teitelboim model of two-dimensional gravity and the SL (2, R) induced gravity. These are shown to be related to a two-dimensional gauge theory obtained by dimensionally reducing the Chern-Simons action of the 2+1 dimensional gravity. We present an explicit solution to the equations of motion of the auxiliary field of the Jackiw-Teitelboim model in the light-cone gauge. A renormalization of the cosmological constant is also given.
ON FERMION NUMBER VIOLATION AT HIGH ENERGIES
Authors: AOKI KENICHIRO
Published: November 2004

By considering the back reaction of the scattered particles on instantons, the explicit high energy behavior of fermion number violating amplitudes in the standard electroweak model is obtained to the leading order in the coupling constant. The amplitudes decay faster than what is expected from naive dimensional analysis due to the renormalization group flow of the coupling constant and this is consistent with unitarity. Also, it is shown that the constrained instanton approach is valid at low energies, while the high energy behavior is governed by the back reaction of the external particles.
MONOPOLE ACCRETION BY COSMIC STRINGS
Authors: MATHESON A.M. , UPTON D.M.
Published: November 2004

We study the accretion of super-heavy magnetic monopoles around cosmic string loops in the very early universe. For sufficiently massive monopoles, a possible result of this accretion process is the formation of monopole-black holes, leading ultimately to a monopole-to-photon ratio comparable to the limits required by neutron star observations.
A THEORY OF QUARKS AND LEPTONS
Authors: FOOT R. , LEW H.
Published: November 2004

The gauge theory with gauge group [SU(3)]2 ⊗ [SU(2)]2 ⊗ [U(1)Y′]3 supplemented by quark-lepton, left-right, and generation discrete symmetries represents a new approach to the understanding of the particle content of the standard model. All of the fermion fields of the model are interconnected by the discrete symmetries. The classical symmetries and the symmetry breaking content of the model explain the electric charges of all of the observed particles. The theory also predicts the existence of new heavy mesons. Some implications of this theory are discussed.
ON A SIMPLE EVALUATION OF ANOMALIES FROM THE PATH INTEGRAL MEASURE
Authors: INAGAKI TAKESHI
Published: November 2004

Anomalies can be evaluated as non-trivial Jacobian factors of the path integral measure. We make several comments on this calculation by taking two-dimensional gravity theories as examples. We present a new method which makes practical calculations much simpler.
3D MAXWELL-CHERN-SIMONS SPONTANEOUS SYMMETRY BREAKING
Authors: ARAGONE C. , ARIAS P.
Published: November 2004

We study the spontaneous symmetry breaking of the 3D Maxwell-Chern-Simons (MCS) system. This action has one transverse, massive, parity sensitive degree of freedom. We show that after symmetry breaking, this excitation remains massive (although with an increased value) while the other transverse, parity sensitive, vector-like degree of freedom of the system (initially non-excited) acquires mass. These two masses are always different. Covariant, light-front and canonical analysis of the massive MCS system is given as well as the two coupled reduced actions. The quartic behavior of the system propagator stems from this coupled structure.
HIGGS BOSON MASS AND THE ANTHROPIC PRINCIPLE
Authors: SHAPOSHNIKOV M.E. , TKACHEV I.I.
Published: November 2004

We discuss the connection of the anthropic principle and dynamical coupling constants originating in the baby universe picture of quantum gravity. It is argued that the mass of the Higgs boson should be equal to 45 GeV provided the electroweak scenario of baryogenesis is correct.
NON-UNIVERSALITY IN DYNAMICALLY TRIANGULATED RANDOM SURFACES WITH EXTRINSIC CURVATURE
Authors: BAILLIE C.F. , WILLIAMS R.D. , JOHNSTON D.A.
Published: November 2004

Earlier simulations of dynamically triangulated random surfaces with a pure Gaussian (Polyakov) action have suggested that the incorporation of a term which is equivalent to the square of the scalar curvature, R2, in the continuum can affect the properties of the surfaces, despite the fact that such a term appears to be irrelevant on dimensional grounds. However, simulations by the current authors and Catterall of dynamically triangulated random surfaces with extrinsic curvature produced essentially identical results despite differing coefficients for the R2 term. In this short note we show that small (positive or negative) values of this coefficient have little effect but that large values to produce measurable effects. This explains the concordance of our previous results with Catterall’s and also provides evidence for non-universal behavior in the random surface model.
N=2 SUPERCONFORMAL MODELS AS TOPOLOGICAL FIELD THEORIES
Authors: EGUCHI TOHRU , YANG SUNG-KIL
Published: November 2004

We present simple observations on the topological nature of N=2 superconformal field theories. We point out that under a suitable redefinition of the energy-momentum tensor the central charge of N=2 theory vanishes and the theory is transformed into a topological quantum field theory. BRST invariant observables are given by chiral primary fields. We also discuss the relevant perturbations of N=2 and SU(2) coset models.
PARITY VIOLATION IN FEW-NUCLEON SYSTEMS: WHERE DO WE STAND?
Authors: MEIβNER ULF-G.
Published: November 2004

We review the present status of our understanding of parity violation in few-nucleon systems. At low energies, nuclear parity-violating forces can be parametrized in the framework of meson-exchange potentials. The pertinent weak meson-nucleon couplings can be calculated by invoking either the quark or the soliton model of the low-lying baryons. We compare the resulting couplings and discuss the advantages and limitations of both approaches. Then, we turn to the experimental study of nuclear parity violation in few-nucleon systems. First, we review various calculations of the longitudinal asymmetry in proton-proton scattering with an eye on the upcoming high-precision experiment at TRIUMF. We stress the importance of a consistent calculation of the weak and strong nucleon-nucleon potential. A toy calculation is presented for the photo-disintegration of the dueteron, which appears to be an excellent candidate to pin down the parity-violating pion-nucleon coupling constant. We encourage further theoretical as well as experimental studies.
COMPLEX STRUCTURES AND ISOMETRIES IN THE (2, 0) SUPERSYMMETRIC NON-LINEAR SIGMA MODEL
Authors: HULL C. M.
Published: November 2004

A study is made of those (2,0) supersymmetric non-linear sigma-models which are invariant under the action of an isometry group; this class includes the (2,0) supersymmetric Wess-Zumino-Novikov-Witten models. If, as in the case of the WZNW model, some of the isometries are not holomorphic, then those isometries do not commute with the second supersymmetry and closing the algebra appears to give an infinite number of supersymmetries. It is shown that if any non-holomorphic isometry is accompanied by a compensating deformation of the complex structure, then the symmetry algebra closes without the need to introduce any new symmetries, enabling the model, together with all its symmetries, to be formulated in (2,0) superspace.
THE ORIGIN OF QBRST IN INTEGRABLE MODELS
Authors: DAS ASHOK
Published: November 2004

We present a Batalin-Fradkin-Vilkovisky construction of the BRST charges which have been observed recently in the geometrical approach to the study of integrable models.
THE τ-LEPTON AND ITS ASSOCIATED NEUTRINO
Authors: PICH A.
Published: November 2004

The present knowledge of the τ-lepton and the prospects for future improvements are discussed. It is shown how a better understanding of the τ properties could be used for testing fundamental aspects of the electroweak and strong interactions.
HIGGS BOSONS
Authors: MÉNDEZ A.
Published: November 2004

The main phenomenological aspects of the Higgs bosons are briefly reviewed in the context of the Standard Model and in models with an "extended" Higgs sector. Among the latter, special emphasis is made on the Two-Doublet Model and, particularly, the Minimal Supersymmetric Model.
A NOTE ON KRICHEVER-NOVIKOV-KAC-MOODY ALGEBRA ON RIEMANN SURFACES
Authors: OJIMA SHUICHI
Published: November 2004

On higher genus Riemann surfaces we define a primary field for affine algebra and vacuum with the use of the prescription by global operator formalism proposed by Krichever and Novikov. From the analytic viewpoint, the Ward-Takahashi identity for current insertion and a partial differential equation for correlators of primary fields are derived.
FOUR-POINT FUNCTION OF THE SUPER-WZW MODEL ON THE SPHERE
Authors: AOKI KENICHIRO
Published: November 2004

The superspace formulation of the super-WZW model is used to obtain an explicit expression for the four-point correlation function on the super-sphere given that of the Bose case, for general groups. The correlation function is compared with that of the free super-scalar field theory with background charge and is shown to have an identical structure for the case of SU(2).
N = 2 SUPERSYMMETRIC SOLITON EQUATION
Authors: KOBAYASHI KEN-ICHIRO
Published: November 2004

The N = 2 supersymmetric scalar Lax formalism for soliton equations is studied.
BOUNDS FOR THE DIFFERENTIAL CROSS-SECTION OF ELASTIC HADRON SCATTERING
Authors: KAWASAKI MAMORU , IKEMOTO TAEKO , TAKAISHI TETSUYA
Published: November 2004

We have examined the external properties of the differential cross-section of elastic hadron scattering. General criteria for the maximum, minimum and saddle points have been obtained. It is found that the extremum given by Arushanov previously as the lower bound for the backward cross-section will become a saddle point at high energies, contrary to his assertion.
A REMARK ON THE CONNECTION BETWEEN CHERN-SIMONS-HIGGS THEORY AND TOPOLOGICALLY MASSIVE ELECTRODYNAMICS
Authors: SCHAPOSNIK FIDEL A.
Published: November 2004

We show that the transmutation of the 3-dimensional abelian Chern-Simons-Higgs theory into topologically massive electrodynamics only holds in the topologically trivial sector.
1D BOSONIZATION, 3D EXTENDED SUPERPARTICLES, CHERN-SIMONS, AND TWISTORS
Authors: SIEGEL W.
Published: November 2004

Various properties of simple and extended supersymmetry in 3D space-time are discussed and related.
LOOKING FOR NEW SCALARS IN THE NEUTRAL PION DECAY
Authors: DOBROLIUBOV M.I.
Published: November 2004

We found a strong enhancement of the rate of the decay of π0-meson into scalar and pseudoscalar bosons as compared with its decay into two photons. The branching ratio of this mode can be as large as BR(π0→S+P)≃10−6–10−5, which is very interesting from the experimental point of view.
TOPOLOGICAL HIGGS MECHANISM WITH ORDINARY HIGGS MECHANISM
Authors: ODA ICHIRO , YAHIKOZAWA SHIGEAKI
Published: November 2004

Topological Higgs mechanism in higher dimensions is analyzed when ordinary Higgs potential exists. It is shown that if 1-form B field becomes massive by the ordinary Higgs mechanism, another D-2 form C field also becomes massive through topological term in addition to the topological mass generation by the topological Higgs mechanism. Moreover, we investigate this mechanism in 3-dimensional theories, that is to say, Chern-Simons theory and more general theory.
MODULI SPACE OF CHERN-SIMONS GRAVITY
Authors: SODA JIRO , YAMANAKA YUKI
Published: November 2004

Conformally invariant (2+1)-dimensional gravity, Chern-Simons gravity, is studied. Its solution space, moduli space, is investigated using the linearization method. The dimension of moduli space is determined as 18g–18 for g>1, 6 for g=1 and 0 for g=0. We discuss the geometrical meaning of our investigation.
CLASSIFICATION OF CRITICAL HERMITIAN MATRIX MODELS
Authors: DALLEY SIMON , JOHNSON CLIFFORD V. , MORRIS TIM
Published: November 2004

The critical properties of Hermitian matrix models in the one-arc phase may be simply understood and completely classified by the behavior of the eigenvalue distribution at its ends. The most general critical behavior involves two scaling functions naturally associated with each end of the distribution, and two KdV-type string equations with differing values of the critical index m. The critical conditions are shown to include previous discoveries as special cases.
A METHOD OF SEARCHING FOR EXCITED b-HADRONS IN HIGH ENERGY EXPERIMENTS
Authors: BLINOV A.E.
Published: November 2004

Narrowness of the fragmentation function of b-quarks allows one to search for monochromatic γ, π or K produced in transitions from the excited b-hadrons without reconstruction of the final b-hadron.
FRACTIONAL SPIN ON THE SPHERE AND THE BREAKING OF ROTATIONAL INVARIANCE
Authors: BIMONTE G. , SPARANO G.
Published: November 2004

Topological considerations, in apparent disagreement with operatorial ones, seem to suggest that only integer and half-integer spins are possible on a sphere. In this letter we show that fractional spin is indeed possible on a sphere, but only by breaking the rotational invariance. As we will show in a subsequent paper, this is an example of the fact that the quantizations individuated by the covering space are those that preserve the continuous classical symmetries.
CHIRAL SYMMETRY AND MESON LOOP MODEL FOR NON-LEPTONIC K AND D WEAK DECAYS
Authors: KARLSEN R.E. , SCADRON M.D.
Published: November 2004

We show that K→ππ and charmed [Formula: see text] decays can be understood using chiral symmetry and a meson loop model to simulate first order weak decays driven by the heavy-W vector boson.
THE BOUND ON THE RENORMALIZED CHARGE IN QUANTUM ELECTRODYNAMICS AND IN THE WESS-ZUMINO MODEL
Authors: KRASNIKOV N.V.
Published: November 2004

An upper bound on the renormalized coupling constant α≤3πε+O(ε2) is found in quantum electrodynamics in n=4–2ε space-time. Analogous bound is obtained for a la Speer regularized Wess-Zumino model. The obtained bound means the triviality of QED and the Wess-Zumino model in the limit of the regularization removing.
IS A C-EXOTIC 1−+ STATE POSSIBLE BELOW 1.6 GeV?
Authors: TUAN S.F.
Published: November 2004

We argue on the basis of dual models, supplemented by Schwimmer’s analysis that all nice features of resonance-Regge pole duality requires the non-existence of C-exotic mesons, that indeed such states are likely to be absent in the energy domain ≲1.6 GeV where duality has been successfully tested experimentally. The status of the experimental C-exotic 1−+ candidate M(1405) is examined further. Evaluation of methods for experimental search of this class of states is also briefly discussed.
TAU NEUTRINOS AND COLD DARK MATTER
Authors: GIUDICE G.F.
Published: November 2004

Neutrinos with standard weak interactions are possible hot dark matter candidates, but they cannot provide an explanation for a cold dark matter scenario, because of constraints from relic abundance. It is shown here, however, that a stable ντ with a mass in the range 1–35 MeV and a magnetic moment of 10−6 Bohr magnetons is a possible candidate for a cold dark matter particle. This hypothesis can be experimentally tested in the near future.
GAUGED WESS-ZUMINO-NOYIKOV-WITTEN MODELS AND 2D QUANTUM SUPERGRAVITY
Authors: SABRA W.A.
Published: November 2004

We examine the relation between the Borel gauged OSp (N, 2) Wess-Zumino-Novikov-Witten models and Polyakov’s 2D quantum supergravities. We show the equivalence between these models and the symplectic actions derived on the co-adjoint orbits of the N-extended super Virasoro groups.
SPECTRAL DECOMPOSITION OF R-MATRICES FOR EXCEPTIONAL LIE ALGEBRAS
Authors: SERGEEV S.M.
Published: November 2004

In this paper spectral decompositions of R-matrices for vector representations of exceptional algebras are found.
COUPLING THE WESS-ZUMINO-WITTEN MODEL TO YANG-MILLS FIELDS
Authors: HULL C.M. , SPENCE B.
Published: November 2004

The coupling of the 2n-dimensional Wess-Zumino-Witten action to gauge fields is discussed and a simple manifestly gauge-invariant form of the gauged Wess-Zumino term is found which is an integral over a (2n+1)-dimensional space whose boundary is space-time. In two and four dimensions, our actions give simple forms for the action describing coset conformal field theories and the low-energy QCD effective action, respectively.
NUMERICAL STUDY OF A TWO-POINT CORRELATION FUNCTION AND LIOUVILLE FIELD PROPERTIES IN TWO-DIMENSIONAL QUANTUM GRAVITY
Authors: AGISHTEIN M.E. , BENAV R. , MIGDAL A.A. , SOLOMON S.
Published: November 2004

Two-point Green’s function is measured on the manifolds of a 2-dimensional quantum gravity. The recursive sampling technique is used to generate the triangulations, lattice sizes being up to hundred thousand triangles. The grid Laplacian was inverted by means of the algebraic multi-grid solver.

The free field model of the Quantum Gravity assumes the Gaussian behavior of Liouville field and curvature. We measured histograms as well as six momenta of these fields. Our results support the Gaussian assumption.
A COMPLETELY UNUNIFIED ELECTROWEAK MODEL
Authors: CHOUDHURY DEBAJYOTI
Published: November 2004

We construct a “fully ununified” electroweak model in which the quarks and leptons transform under separate SU (2) L ⊗ U (1)Y groups. There are two charged and three massive neutral gauge bosons, the lightest of which are similar to the standard model particles. Anomaly cancellation does not lead to any tree level flavor changing neutral currents except in the neutrino sector. A variant that naturally leads to a hierarchy in the Kobayashi-Maskawa matrix elements is proposed.
INTERMITTENCY-GENERATING CASCADE MODEL OF MULTIPARTICLE PRODUCTION WITH PARTICLE NUMBER CONSERVATION
Authors: LEONIDOV A.V. , TSYPIN M.M.
Published: November 2004

An intermittency-generating cascade model taking into account the conservation of particle number in the process of cascading is proposed. The model successfully describes the data on factorial moments by UA5 [Formula: see text] provided that we impose the correct multiplicity distribution in the total (pseudo)rapidity interval. At the same time the correlation pattern is not reproduced due to geometrical rigidity of the cascade.
PROTON LIFETIME: A DEATH BLOW TO THE MINIMAL SU(5) MODEL?
Authors: MUKHOPADHYAY P.
Published: November 2004

This paper points out that the minimal SU(5) model predicted value of proton lifetime (τp) falls far short of the experimental hints for the same mainly because of an unrealistic assumption made in the theoretical estimates for τp. Furthermore, it has been argued that this model is neither ruled out nor even disreputed despite the so far non-observation of proton decay for the reason discussed in this paper.
LOGARITHMIC SCALING VIOLATION AND BOSE CONDENSATION IN ONE-MATRIX MODELS
Authors: TAN CHUNG-I.
Published: November 2004

In this paper, we are interested in studying critical behavior of Hermitian one-matrix models where the topological expansion for the free-energy develops a logarithmic singularity, Γ∝μ2 log μ+…. We consider models where the potential is of the type U(M)= t0V0(M)−tf log Vf(M). We show that, for tf>0, the model has an underlying fermionic structure. Continuing into the bosonic region where tf<0 allows the possibility of Bose condensation, which is shown to be responsible for a logarithmic scaling violation for the free energy.
GAUGING σ-MODEL ISOMETRIES IN (2, 0)-SUPERSPACE
Authors: ALMEIDA CARLOS A.S. , HELAYËL-NETO J.A. , SMITH A. WILLIAM
Published: November 2004

Considering (2, 0)-supersymmetric non-linear σ-models defined over Kählerian coset manifolds, we discuss the gauging of the isotropy and isometry groups in (2, 0)-superspace and present the action coupling these σ-models to the (2, 0)-Yang-Mills supermultiplets.
BOSONIC STRING WITH TOPOLOGICAL TERM
Authors: ZAIKOV R. P.
Published: November 2004

It is shown that in D = 3 space-time dimensions there exist a topological term for the bosonic strings. The corresponding constraints satisfy the same Virasoro algebra as the ordinary bosonic strings. These results are generalized for an arbitrary dimensional space-time if we have SO (1, 2) ⊗ O (D − 3) or SO (3) ⊗ O (1, D − 4) symmetry instead of SO (1, D − 1) space-time symmetry. A gauge-dependent correction to the Casimir energy corresponding to this topological term is derived.
EXISTENCE AND STABILITY OF GAUGED NON-TOPOLOGICAL SOLITONS
Authors: LEE CHUL H. , YOON SEUNG UN
Published: November 2004

Classical non-topological soliton configurations are considered in a theory with a local U(1) symmetry. Their existence, stability against dispersion into free particles are studied numerically. As in the case of Friedberg, Lee, and Sirlin with a global U(1) symmetry, also in this case there are two critical charges; Qc for the existence and Qs for the stability of the non-topological soliton configurations. Our numerical results show that the magnitudes of both Qc and Qs increase as the magnitude of the gauge coupling constant e is increased with the other parameters kept at fixed values.
YANG–MILLS THEORY AND NON-LOCAL REGULARIZATION
Authors: MOFFAT J. W. , ROBBINS S. M.
Published: November 2004

The lowest order diagrams required to guarantee decoupling and gauge invariance in non-local regularized, non-Abelian gauge theory are derived.
c = 1 − 6(n − 1)2/n, THEORIES COUPLED TO GRAVITY: A COMMENT ON THEIR POSSIBLE LATTICE MODELS REALIZATIONS
Authors: SALEUR HUBERT
Published: November 2004

We discuss the recently proposed logarithmic violation of scaling for c = 1 − 6(n − 1)2/n theories in the light of lattice models. We study for this purpose the Q state Potts model in its antiferromagnetic regime eK − 1 = −Q1/2, coupled to gravity. Setting Q1/2 = 2 cos π/t, this model is known to have a generic central charge c = 1 − 6(t − 1)2/t. Summing over all possible planar graphs allows us to make connection with Kostov's solution of IRF models, and to calculate the genus zero properties along the critical line.

Except for n = 1, 2 we do not get indications of logarithmic violations. The apparent regularity of the thermodynamic properties (γ str = −(n − 1) = integer ) is explained by a discontinuity of the free energy of the Potts model when Q crosses the Beraha numbers [Formula: see text], n ≥ 3 in the antiferromagnetic region. Such behavior was recently observed for some regular lattices. The logarithmic terms for n = 2, c = −2 appear simply because a derivative with respect to Q has to be taken to define a non-vanishing partition function. Only the n = 1, c = 1 logarithmic terms seem to have a non-trivial origin.
TERNARY ALGEBRAIC CONSTRUCTION OF EXTENDED SUPERCONFORMAL ALGEBRAS
Authors: GÜNAYDIN MURAT , HYUN SEUNGJOON
Published: November 2004

We give a construction of extended (N = 2 and N = 4) superconformal algebras over a very general class of ternary algebras (triple systems). For N = 2 this construction leads to superconformal algebras corresponding to certain coset spaces of Lie groups with non-vanishing torsion and generalizes a previous construction over Jordan triple systems which are associated with Hermitian symmetric spaces. In general, a given Lie group admits more than one coset space of this type. We give examples for all simple Lie groups. In particular, the division algebras and their tensor products lead to N = 2 superconformal algebras associated with the groups of the Magic Square. For a very special class of ternary algebras, namely the Freudenthal triple (FT) systems, the N = 2 superconformal algebras can be extended to N = 4 superconformal algebras with the gauge group SU (2) × SU (2) × U (1). We give a complete list of the FT systems and the corresponding N = 4 models. They are associated with the unique quaternionic symmetric spaces of Lie groups.
QUARK SEA STRUCTURE FUNCTIONS WITHIN NON-PERTURBATIVE APPROACH AND HEAVY QUARK PRODUCTION
Authors: DOROKHOV A. E. , KOCHELEV N. I.
Published: November 2004

Within the model of QCD vacuum as an instanton liquid the parametrization of the sea quark structure functions in the proton is obtained. A new mechanism of heavy quark production is suggested. It is shown that the J/Ψ suppression as well as ϕ enchancement observed experimentally in AA-collisions can be explained within the non-perturbative mechanism.
TWO-DIMENSIONAL QUANTUM GRAVITY WITH GENERALIZED ACTION AND COMPACT BOSON
Authors: LICHTZIER I. M. , ODINTSOV S. D.
Published: November 2004

The generalized 2-dimensional quantum gravity is considered. The path-integral is evaluated without the need to impose the restrictions on the dimensions of matter. The partition function as well as Hagedorn temperature is also calculated for the case when one boson is compact.
HARD HADRON-NUCLEUS PROCESSES IN THE DYNAMICAL RESCALING MODEL
Authors: SALEEV V. A.
Published: November 2004

We develop the dynamical rescaling model in the case of hard hadron-nucleus processes at high energy. It is shown that the rescaling effect takes place both for hadron which penetrates through the nuclear medium and for the bound nucleon. The main reason for the rescaling is the quasielastic re-scattering of quarks from the incoming hadron on the nucleons inside the nucleus before the hard subprocess. We demonstrate a very good agreement data of J/Ψ and leptonic pairs xF-spectra in hadron-nucleus interaction with our results.
SIMPLIFIED SYMMETRIC QUARK MASS MATRICES AND FLAVOR MIXING
Authors: FRAMPTON PAUL H. , OKADA YASUHIRO
Published: November 2004

A new formula relating flavor mixing and quark masses is derived from an ansatz for mass matrices. In particular, given mu, mc and |Vcb| the formula relates the top mass mt to |Vub|.
CALABI–YAU MODULI SPACE, SPECIAL GEOMETRY AND MIRROR SYMMETRY
Authors: FERRARA S.
Published: November 2004

We review some aspects of the geometry of the moduli space of superstring vacua with (2, 2) superconformal symmetry, its connection with the deformation theory of holomorphic three forms and its relation to space-time supersymmetry.
A SIMPLE ANSATZ RELATING ALL MIXING ANGLES TO QUARK MASS RATIOS
Authors: NG DANIEL , NG Y. JACK
Published: November 2004

A simple ansatz for quark mass matrices which yields the Kac–Moody (KM) matrix elements, [Formula: see text], Vcb = ms/mb, and [Formula: see text], is investigated, resulting in two empirical identities, md/ms = ms/mb and mu/mc = mc/mt. Using Vub = 0.004 ± 0.002, we obtain mt = (290 ± 140) GeV . We find that this prediction is consistent with other processes, such as [Formula: see text] mixing. The invariant quantity, J, of CP violation is of the order 3 × 10−5 in agreement with experiments.
SEARCH FOR HIGH ENERGY γ-RAYS FROM THE GALACTIC PLANE BY AIRBORNE EXPERIMENT
Authors: ENOMOTO R. , CHIBA J. , OGAWA K. , SUMIYOSHI T. , TAKASAKI F. , KIFUNE T. , MATSUBARA Y.
Published: November 2004

A new method to measure high-energy γ-rays from astronomical objects has been developed. In this method, a commercial cargo airplane was used in order to work at an altitude near to the air shower maximum. γ-rays with energies greater than 40 GeV have been measured by a lead-glass based electron telescope. The angular resolution was estimated to be approximately 1°. The first experiment has been carried out on a flight between Narita, Japan and Sydney, Australia on June 7, 1989 (JST). We have observed a possible structure of γ-ray emission from the Galactic plane.
RECENT SOLAR NEUTRINO OBSERVATIONS AND RESONANT NEUTRINO MIXING
Authors: KUO T. K. , PANTALEONE JAMES
Published: November 2004

The results of recent data from the 37 Cl , Kamiokande-II (K-II) and 71 Ga solar neutrino experiments are quantitatively analyzed. The results suggest that non-standard neutrino properties, instead of a non-standard solar model, are the correct explanation for the "solar neutrino problem." Assuming resonant neutrino oscillations, it is found that the "non-adiabatic" and "large angle" solutions are in quite good agreement with the data. The implications of these solutions for forthcoming solar neutrino experiments are discussed.
CHROMODYNAMIC FLUX TUBES
Authors: GUENDELMAN E. I. , OWEN D. A.
Published: November 2004

We show that in the presence of condensation of a gauge field there is confinement of chromodynamic charges. Between these confined charges an electric flux tube is generated. In particular we have considered the classical solutions for an SU (2) Yang-Mills theory in the presence of such a condensate. This treatment has been motivated by the cancellation of infrared divergences in 2+1 dimensions.
APPROXIMATELY SYMMETRIC KM MATRIX AND RANK-ONE QUARK MASS MATRIX
Authors: TANIMOTO MORIMITSU
Published: November 2004

The approximately symmetric KM matrix is investigated in relation to the rank-one quark mass matrix. In our results, we obtain the two-angle parametrization of the KM matrix by Kielanowski. Three interesting cases of the symmetric KM matrix are shown. The deviation from the perfectly symmetric one is also investigated numerically.
POINCARÉ ALGEBRA AND SOLITON ENERGY IN KINK FIELD THEORY
Authors: JAIN PANKAJ
Published: November 2004

We analyze the behaviour of kink soliton Lorentz transformations. We show that for consistency with the Poincaré algebra we have to use a regularization prescription, which is different from the one used by Dashen, Hasslacher and Neveu, for calculating the soliton energy.
MANIFEST COVARIANCE CONDITION IN A RELATIVISTIC LAGRANGIAN STRING THEORY
Authors: GRIGORE D. R.
Published: November 2004

The manifest covariance condition of Currie and Hill for a relativistic Lagrangian N-particle theory is generalized for a Lagrangian relativistic string theory. The corresponding Currie–Hill equations are derived. We can analyze the emerging problem only in a particular case, and we obtain only a trivial solution for the Lagrangian. This seems to indicate that a non-constrained Lagrangian formalism is not very suitable for the description of a relativistic string.
ON BOSONIC STRING MODELS IN SEMICLASSICAL APPROXIMATION: THE DERIVATIVE OF THE FUNCTIONAL DETERMINANT OF THE TRANSVERSE FLUCTUATION OPERATOR
Authors: HAUSER C. , POHLMEYER K.
Published: November 2004

Under some restrictions we calculate the functional derivative of the determinant of an operator which is the main ingredient in the semiclassical approximation of the physical ground state of the closed bosonic string. We show that a formula for the determinant itself previously published by other authors is incorrect.
η' - η - π0 MIXING AND FLAVOR SYMMETRY VIOLATION OF QUARK VACUUM CONDENSATE RATIO IN QCD
Authors: NIYOGI SUBHRA
Published: November 2004

We estimate the sizes of η - η', η - π0 and η' - π0 mixing angles by solving the Ward-identities in QCD and taking into account SU(3) violation of the quark condensates. Our results are compared with those obtained by treating the quark condensates SU(3) symmetric.
PREDICTION OF THE TOP QUARK MASS IN A FINITE ELECTROWEAK THEORY
Authors: CLAYTON M. , MOFFAT J. W.
Published: November 2004

A parameter-free prediction of the top quark mass is obtained from the calculation of [Formula: see text] in a finite non-local electroweak theory, in which the W and Z gauge bosons acquire their masses through the lowest order vacuum polarization graphs containing fermion loops. The SU (2)× U (1) gauge symmetry is broken to U (1) em by a symmetry breaking measure factor in the path integral without resorting to a Higgs mechanism. Using the ratio of the W and Z masses obtained from the average of the UAI, UA2 and the CDF experiments, we predict mt=86±33 GeV and the gauge boson non-local scale Λw=523±4 GeV . Using the CDF measured W mass, we find mt=125±40 GeV and Λw=529±6 GeV . The particle spectrum in the model contains the W, Z and photon gauge bosons and the standard three generations of leptons and quarks, including the anticipated top quark.
INVESTIGATION OF THE CONSTRAINTS ON TWISTED AND UNTWISTED YANG–MILLS THEORIES IN A SLAB
Authors: LEVI A. R.
Published: November 2004

BRST is used to investigate the consistency of the quantum constraints for Yang–Mills theories based on twisted and untwisted SU (N) in a slab with periodic boundary conditions in one dimension.
WHAT WILL THE TOP QUARK TELL US ABOUT THE HIGGS BOSON MASS?
Authors: RIZZO THOMAS G.
Published: November 2004

If the Tevatron discovers the top (t) quark and determines its mass with reasonable precision during the next few years, our knowledge of the radiative corrections in the standard model can be combined with other existing data to constrain the mass of the Higgs boson (mH) from above. To demonstrate this, we show that if mt = 100(120,150) ± 10 GeV , one finds that mH ≤ 225 (270, 473) GeV at the 95% C. L. from existing data. For heavy top-quark masses, lower bounds on mH are also obtained. The importance of including two-loop electroweak corrections and Consoli–Hollik–Jegerlehner resummation in obtaining these bounds on mH is emphasized. The present analysis incorporates these leading two-loop electroweak corrections for the first time, includes the three-loop QCD contributions to the partial widths of the Z, and uses the latest available set of input data.
REAL PART OF THE $\bar pp$ ELASTIC SCATTERING AMPLITUDE AT $\sqrt{s} = 546\, {\rm GeV}$
Authors: BOURRELY CLAUDE , SOFFER JACQUES , WU TAI TSUN
Published: November 2004

In order to get an accurate determination of the real part of the [Formula: see text] elastic scattering amplitude at [Formula: see text], the Genoa–Palaiseau–Roma–Valencia collaboration plans to take experimental data on dσ/dt in the Coulomb interference region. We present detailed theoretical predictions for this cross-section. These predictions can be compared directly with the forthcoming data.
THE RESOLUTION OF THE |ΔI|=1/2 PUZZLE
Authors: STECH BERTHOLD
Published: November 2004

Progress in the understanding of non-leptonic weak decays with its intricate interplay of weak and strong interactions is reported. At low energies the dynamics of these processes is strongly influenced by non-perturbative correlations between two quarks in Lorentz scalar color antitriplet states. A coherent description of kaon and hyperon decays emerges resolving so far mysterious puzzles.
BERRY'S PHASE, FRACTIONAL STATISTICS AND THE LAUGHLIN WAVE FUNCTION
Authors: FORTE STEFANO
Published: November 2004

We determine the path-integral for particles with fractional spin and statistics in the adiabatic limit, and we discuss the identification of the spin-changing term with a Berry phase. We show that the standard proof that the Laughlin wave function describes excitations with fractional statistics holds only on the basis of a tacit assumption of questionable validity.
ON A ONE-PARAMETER FAMILY OF EXOTIC SUPERSPACES IN TWO DIMENSIONS
Authors: GÜNAYDIN MURAT
Published: November 2004

Using Jordan algebraic techniques we define and study a family of exotic superspaces in two dimensions with two bosonic and two fermionic coordinates. They are defined by the one-parameter family of Jordan superalgebras JD (2/2)α. For two special values of α the JD (2/2)α can be realized in terms of a single fermionic or a single bosonic oscillator, respectively. For other values of α it can be interpreted as defining an exotic oscillator algebra. The derivation, reduced structure and Möbius superalgebras of JD (2/2)α are identified with the rotation, Lorentz and finite-dimensional conformal superalgebras of the corresponding superspaces. The conformal superalgebras turn out to be the superalgebras D(2,1;α) with the even subgroup SO(2,2)×SU(2) . We give an explicit differential operator realization of the actions of D(2,1;α) on these superspaces.
REMARKS ON DIFFERENTIAL CALCULI ON MANIN'S PLANE
Authors: GILER S. , KOSIŃSKI P. , MAŚLANKA P.
Published: November 2004

All scale-invariant differential calculi on quantum plane are found. Their operator realization is constructed and problem of defining derivatives is analyzed in some detail.
STOCHASTIC GAUGE-FIXING FOR NON-ABELIAN ANTISYMMETRIC TENSOR FIELDS
Authors: NAKAMURA ATSUSHI
Published: November 2004

By using the BRST invariance, we find the stochastic gauge-fixing function which corresponds to the ordinary gauge-fixing function for non-Abelian antisymmetric tensor fields as reducible gauge theories. Then the trial stochastic gauge-fixing function is obtained perturbatively.
COLLECTIVE FLOW, TRANSVERSE MOMENTUM TRANSFER, AND STOPPING IN THE BNV NUCLEAR COLLISION MODEL
Authors: MOLITORIS J. J. , BONASERA A. , CAVINATO M. , GULMINELLI F.
Published: November 2004

Symmetric intermediate energy heavy-ion collisions are studied in the Boltzmann-Nordheim-Vlasov theory, where the collision dynamics is determined by the mean field, the Pauli principle, and the NN scattering cross-sections. Differences between the parallel ensemble and the full ensemble approaches are enumerated. The effect of the model equation of state on the transverse momentum transfer is delineated and shown to be comparable in magnitude to that of the EOS. The mass dependence of the transverse momentum transfer and collective flow angle is discussed.
LANDAU GAUGE AND ANTI-BRS SYMMETRY
Authors: DORIA R. , DE CARVALHO F. RABELO , SORELLA S. P.
Published: November 2004

By using the anti-BRS sysmmetry of the Landau gauge we study the renormalization of the Yang-Mills theory and we show that, in analogy with the BRS case, the model is only described by two independent parameters.
NON-PERTURBATIVE EFFECT OF A MODIFIED ACTION IN MATRIX MODELS
Authors: SAWADA SHIRO , UEDA HARUHIKO
Published: November 2004

A modified matrix model action, which may provide the well-defined two-dimensional pure gravity theory, proposed by Das, Dhar, Sengupta and Wadia is analyzed non-perturbatively. The perturbative solution in genus expansion is also obtained. It is shown that the specific heat satisfies Painlevé equation in the double scaling limit. Thus the modified action is found to be in the same universality class as ordinary matrix models.
CONFORMAL QUANTIZATION AND SPACE-TIME SINGULARITY
Authors: JOSHI P.S. , NARLIKAR J.V.
Published: November 2004

This work generalizes earlier results of conformal quantization1,2 that within the full range of space-times conformal to any singular space-time satisfying Einstein’s field equations for minimally coupled matter, the singular solutions form a set of zero-probability measure. A wider definition of space-time singularity that includes the curvature singularity assumed in the earlier work (op. cit.) is adapted and it is shown that the previous conclusion stands even when the present state of the universe is defined by wave functionals that are not necessarily wave packets. Within the present framework of quantum gravity therefore it seems extremely unlikely that the universe had a singular origin.
UNCERTAINTY PRINCIPLE AND THE QUANTUM FLUCTUATIONS OF THE LIGHT CONES IN THE STATIC SPACE-TIMES
Authors: DAFTARDAR VARSHA , DADHICH NARESH
Published: November 2004

The application of the uncertainty relation to position and velocity of a source point represented by a general asymptotically flat static metric leads to fluctuations of the metric and the light cone structure. The fluctations in the coordinate photon velocity are given by the formula [Formula: see text] where k is the surface gravity and m is the mass of the source point.
NONRENORMALIZATION THEOREMS OF CHIRAL ANOMALIES AND FINITENESS IN SUPERSYMMETRIC YANG-MILLS THEORIES
Authors: PIGUET O. , SIBOLD K.
Published: November 2004

We prove a generalized nonrenormalization theorem for U(1) axial anomalies in rigid N=1 supersymmetric gauge theories in 4 space-time dimensions. The theorem implies one-loop criteria for β-functions vanishing to all orders of perturbation theory. The criteria are applicable to all N=1 theories with simple gauge group.
OBSERVABLE EFFECT OF CURVATURE ON SUPER-RADIANT STATES
Authors: KARIM MUNAWAR
Published: November 2004

Super-radiant states have properties that make them particularly suitable for experiments to test the effects of gravitational curvature on the quantized electromagnetic field.
ABSENCE OF GRAVITATIONAL RADIATION IN COLLISION OF TWO STRAIGHT COSMIC STRINGS
Authors: ALIEV A.N. , GAL’TSOV D.V.
Published: November 2004

It is shown that no gravitational radiation is produced in collision of two freely moving straight parallel cosmic strings.
FINITE TEMPERATURE EFFECTIVE POTENTIAL IN A KALUZA-KLEIN UNIVERSE
Authors: ROY PINAKI
Published: November 2004

We evaluate the finite temperature one-loop effective potential for scalar fields in Kaluza-Klein universe consisting of the product of a space with open Robertson-Walker metric and the N sphere SN. The one-loop effective potential has been computed in both high and low temperature limits.
THE QUANTUM MASS FOR TOPOLOGICALLY EXTENDED OBJECTS IN BIDIMENSIONAL THEORIES
Authors: CASAHORRAN J.
Published: November 2004

The first quantum correction to the mass associated with topologically extended objects of some nonlinear scalar models, coupling to fermions included, is computed using a method which needs only the discrete levels of Schrodinger equations. Subsequently the technique is applied to (λϕ4)1+1 and the sine-Gordon systems.
A DISCUSSION OF THE CONSTRAINTS IN N=1 SUGRA-SYM IN 10-D
Authors: BONORA L. , BREGOLA M. , LECHNER K. , PASTI P. , TONIN M.
Published: November 2004

We prove that in 10-D SUGRA+SYM the only essential T-constraint is [Formula: see text]; the other conditions on the torsion follow from suitable field redefinitions. We discuss also the H-constraints. We argue that there can be a choice of constraints such that the corresponding models can accommodate the effective actions coming from the superstring theories.