bluuebunny/crossref_metadata_2025 huggingface dataset:
DIMENSIONAL REDUCTION
Authors: MANOGUE CORINNE A. , DRAY TEVIAN
Published: May 2003

Using an octonionic formalism, we introduce a new mechanism for reducing ten space–time dimensions to four without compactification. Applying this mechanism to the free, ten-dimensional, massless (momentum space) Dirac equation results in a particle spectrum consisting of exactly three generations. Each generation contains one massive spin-1/2 particle with two spin states, one massless spin-1/2 particle with only one helicity state, and their antiparticles — precisely one generation of leptons. There is also a single massless spin-1/2 particle/antiparticle pair with the opposite helicity and no generation structure.

We conclude with a discussion of some further consequences of this approach, including those which could arise when using the formalism on a curved space–time background, as well as the implications for the nature of space–time itself.
AXIAL ANOMALY THROUGH ANALYTIC REGULARIZATION
Authors: MANZONI L. A. , PIMENTEL B. M. , TOMAZELLI J. L.
Published: May 2003

In this work we consider the two-point Green's functions in (1+1)-dimensional quantum electrodynamics and show that the correct implementation of analytic regularization gives a gauge invariant result for the vacuum polarization amplitude and the correct coefficient for the axial anomaly.
THETA VACUUM IN DIFFERENT GAUGES
Authors: ADAM C.
Published: May 2003

In some recent papers it was claimed that the physical significance of the vacuum angle theta for QCD-like theories depends on the chosen gauge condition. We criticize the arguments that were given in support of this claim, and show by explicit construction for the case of QED 2 that and why they fail, confirming thereby the commonly accepted point of view.
GAP EQUATION IN SCALAR FIELD THEORY AT FINITE TEMPERATURE
Authors: MUKHERJEE KRISHNENDU
Published: May 2003

We investigate the two-loop gap equation for the thermal mass of hot massless g2ϕ4 theory and find that the gap equation itself has a nonzero finite imaginary part. This implies that it is not possible to find the real thermal mass as a solution of the gap equation beyond g2 order in perturbation theory. We have solved the gap equation and obtained the real and imaginary parts of the thermal mass which are correct up to g4 order in perturbation theory.
A GENERALIZATION OF THE HOLSTEIN–PRIMAKOFF AND THE DYSON EXPANSIONS FOR THE QUANTUM SUPERALGEBRA Uq [gl(n/m)]
Authors: PALEV T. D.
Published: May 2003

A generalization of the Holstein–Primakoff and the Dyson expansions for the quantum superalgebra U q [ gl (n/m)] is written for any n and m. The elements of U q [ gl (n/m)] are expressed via n-1 pairs of Bose creation and annihilation operators and m pairs of Fermi creation and annihilation operators. A realization of the same superalgebra via deformed Bose and Fermi operators is also given.
REMARKS ON FERMION–BOSON EQUIVALENCE IN THREE DIMENSIONS
Authors: DUTRA A. DE SOUZA , NATIVIDADE C. P.
Published: May 2003

Starting from a decomposition of the self-dual field in (2+1) dimensions, we build up an alternative quantum theory which consists of a self-dual model coupled to a Maxwell-generalized Chern–Simons theory. We discuss the fermion–boson equivalence of this quantum theory by comparing it with the Thirring model. Using these results we were able to compute the mass of the bosonized fermions up to third order in 1/m. Some problems related to the number of poles of the effective propagator are also addressed.
p-ADIC AND ADELIC FREE RELATIVISTIC PARTICLE
Authors: DJORDJEVIĆ G. S. , NEŠIĆ L. J. , DRAGOVICH B.
Published: May 2003

We consider spectral problem for a free relativistic particle in p-adic and adelic quantum mechanics. In particular, we found p-adic and adelic eigenfunctions. Within adelic approach there exist quantum states that exhibit discrete structure of space–time at the Planck scale.
ON ELECTROGRAVITY DUALITY
Authors: DADHICH NARESH
Published: May 2003

By resolving the gravitational field into electric and magnetic parts, we define an electrogravity duality transformation and discover an interesting property of the field. Under the duality transformation, a vacuum/flat space–time maps into the original space–time with a topological defect of global monopole/texture. The electrogravity-duality is thus a topological defect generating process. It turns out that all black hole solutions possess dual solutions that imbibe a global monopole.
BTZ BLACK HOLE ENTROPY FROM PONZANO–REGGE GRAVITY
Authors: SUNEETA V. , KAUL R. K. , GOVINDARAJAN T. R.
Published: May 2003

The entropy of the BTZ black hole is computed in the Ponzano–Regge formulation of three-dimensional lattice gravity. It is seen that the correct semiclassical behavior of entropy is reproduced by states which correspond to all possible triangulations of the Euclidean black hole. The maximum contribution to the entropy comes from states at the horizon.
STRING CORRECTIONS TO THE HAWKING–PAGE PHASE TRANSITION
Authors: LANDSTEINER KARL
Published: May 2003

We compute the O(α′3) corrections to the AdS5 black hole metric in type IIB string theory. Contrary to previous work in this direction we keep the black hole radius finite. Thus the topology of the boundary is S3×S1. We find the corrections to the free energy and the critical temperature of the phase transition.
ANISOTROPY IN THE PROPAGATION OF RADIO POLARIZATIONS FROM COSMOLOGICALLY DISTANT GALAXIES
Authors: JAIN PANKAJ , RALSTON JOHN P.
Published: May 2003

Radiation traversing the observable universe provides powerful ways to probe anisotropy of electromagnetic propagation. A controversial recent study claimed a signal of dipole character. Here we test a new and independent data set of 361 points under the null proposal of statistical independence of linear polarization alignments relative to galaxy axes, versus angular positions. The null hypothesis is tested via maximum likelihood analysis of best fits among numerous independent types of factored distributions. We also examine single-number correlations which are parameter free, invariant under coordinate transformations, and distributed very robustly. The statistics are shown explicitly not to depend on the uneven distribution of sources on the sky. We find that the null proposal is not supported at the level of less than 5% to less than 0.1% by several independent statistics. The signal of correlation violates parity, i.e. symmetry under spatial inversion, and requires a statistic which transforms properly. The data indicate an axis of correlation, on the basis of likelihood determined to be [ R.A. = (0 h , 9 m )±(1 h , 0 m ), Decl. =-1°±15°].
NON-ABELIAN BERRY PHASE, YANG–MILLS INSTANTON ANDUSp(2k) MATRIX MODEL
Authors: CHEN B. , ITOYAMA H. , KIHARA H.
Published: May 2003

The non-Abelian Berry phase is computed in the T dualized quantum mechanics obtained from the USp (2k) matrix model. Integrating the fermions, we find that each of the space–time points [Formula: see text] is equipped with a pair of su(2) Lie algebra valued pointlike singularities located at a distance m(f)from the orientifold surface. On a four-dimensional paraboloid embedded in the five-dimensional Euclidean space, these singularities are recognized as the BPST instantons.
A NEW MECHANISM FOR NEUTRINO MASS
Authors: DIVAKARAN P. P. , RAJASEKARAN G.
Published: May 2003

A mechanism for generating massive but naturally light Dirac neutrinos is proposed. It involves composite Higgs within the standard model as well as some new interaction beyond the standard model. According to this scenario, a neutrino mass of 0.1 eV or higher, signals new physics at energies of 10–100 TeV or lower.
ALTERNATIVE FORMULATION FOR DUALITY-SYMMETRIC 11-DIMENSIONAL SUPERGRAVITY COUPLED TO SUPER M-5-BRANE
Authors: NISHINO HITOSHI
Published: May 2003

We present an alternative formulation of duality-symmetric 11-dimensional supergravity with both three-form and six-form gauge fields. Instead of the recently-proposed scalar auxiliary field, we use a simpler Lagrangian with a non-propagating auxiliary multiplier tensor field with eight-indices. We also complete the superspace formulation in a duality-symmetric manner. An alternative super M-5-brane action coupled to this 11-dimensional background is also presented. This formulation bypasses the usual obstruction for an invariant Lagrangian for a self-dual three-form field strength, by allowing the self-duality only as a solution for field equations, but not as a necessary condition.
DUAL NATURE OF RICCI SCALAR AND MODELS OF THE EARLY UNIVERSE
Authors: SRIVASTAVA S. K.
Published: May 2003

In some of the earlier papers, it was noticed that at a high energy level Ricci scalar behaved in dual manner: (a) like a matter field and (b) like a geometrical field. In this letter, dual nature of the Ricci scalar is also obtained from a gravitational action where R2 and R3 terms dominate the Einstein–Hilbert Lagrangian in the gravitational action. Cosmological models are derived using dual role of the Ricci scalar. In an expanding model of the universe, local gravitational effect of a compact object is ignored. These models are interesting in the sense that these have capability of exhibiting gravitational effect of compact objects also in an expanding universe. Moreover, these models provide an inhomogeneous generalization of Robertson–Walker type models. Another important feature of the letter is the derivation of these models through physical theories like phase transition and spontaneous symmetry breaking, not through conventional approach of solving complicated Einstein's field equations.
LOOKING BACK IN TIME BEYOND THE BIG BANG
Authors: GASPERINI M.
Published: May 2003

String theory can (in principle) describe gravity at all curvature scales, and can be applied to cosmology to look back in time beyond the Planck epoch. The duality symmetries of string theory suggest a cosmological picture in which the imprint of a primordial, pre-big bang phase could still be accessible to present observations. The predictive power of such a scenario relies, however, on our ability to connect in a smooth way the pre-big bang to the present cosmological regime. Classical radiation back reaction seems to play a key role to this purpose, by isotropizing and turning into a final expansion any state of anisotropic contraction possibly emerging from the pre-big bang at the string scale.
STRING CREATION IN D6-BRANE BACKGROUND
Authors: MATSUO TOSHIHIRO , YOKONO TAKASHI
Published: May 2003

The production of string charge during a crossing of certain oriented D-branes is studied. We compute the string charge in the system of a probe D2-brane and a background D6-brane by using the equations of motion in ten dimensions. We confirm the creation of string charge as inflow from the background D6-brane.
ON GRAVITY AND THE UNCERTAINTY PRINCIPLE
Authors: ADLER RONALD J. , SANTIAGO DAVID I.
Published: May 2003

Heisenberg showed in the early days of quantum theory that the uncertainty principle follows as a direct consequence of the quantization of electromagnetic radiation in the form of photons. As we show here the gravitational interaction of the photon and the particle being observed modifies the uncertainty principle with an additional term. From the modified or gravitational uncertainty principle it follows that there is an absolute minimum uncertainty in the position of any particle, of order of the Planck length. A modified uncertainty relation of this form is a standard result of superstring theory, but the derivation given here is based on simpler and rather general considerations with either Newtonian gravitational theory or general relativity theory.
A PARAMETRIZATION OF THE INCLUSIVE DIFFRACTIVE CROSS-SECTION AT HERA
Authors: BARTELS JOCHEN , ROYON CHRISTOPHE
Published: May 2003

A recently proposed parametrization for the deep inelastic diffractive cross-section is used to describe the H1 '94 data. We find two possible solutions and discuss them in details.
ROTATING BONNOR SOLUTION IN DILATON–AXION GRAVITY
Authors: KECHKIN OLEG V.
Published: May 2003

We construct new class of solutions which describes a rotating electric–magnetic dipole in the low energy heterotic string theory. Our method is based on the use of symmetries which preserve asymptotic flatness property; the generation of the solution is performed in the variables which linearize the action of these symmetries. The constructed solution possesses nontrivial values of mass, dilaton and axion charges; the maximal value of angular momentum is defined by some combination of the electric and magnetic dipole moments which is invariant under the action of the electric–magnetic duality.
WHAT IS THE HOMOGENEITY OF OUR UNIVERSE TELLING US?
Authors: TRODDEN MARK , VACHASPATI TANMAY
Published: May 2003

The universe we observe is homogeneous on super-horizon scales, leading to the "cosmic homogeneity problem". Inflation alleviates this problem but cannot solve it within the realm of conservative extrapolations of classical physics. A probabilistic solution of the problem is possible but is subject to interpretational difficulties. A genuine deterministic solution of the homogeneity problem requires radical departures from known physics.
FURTHER LATTICE EVIDENCE FOR A LARGE RESCALING OF THE HIGGS CONDENSATE
Authors: CEA P. , CONSOLI M. , COSMAI L. , STEVENSON P. M.
Published: May 2003

Using a high-statistics lattice simulation of the Ising limit of (λΦ4)4 theory, we have measured the susceptibility and propagator in the broken phase. We confirm our earlier finding of a discrepancy between the field rescaling implied by the propagator data and that implied by the susceptibility. The discrepancy becomes worse as one goes closer to the continuum limit; thus, it cannot be explained by residual perturbative effects. The data are consistent with an unconventional description of symmetry breaking and "triviality" in which the rescaling factor for the finite-momentum fluctuations tends to unity, but the rescaling factor for the condensate becomes larger and larger as one approaches the continuum limit. In the standard model this changes the interpretation of the Fermi-constant scale and its relation to the Higgs mass.
DISTRIBUTIONAL TORSION OF HYBRID DEFECTS
Authors: GARCIA DE ANDRADE L. C.
Published: May 2003

Distributional sources of cosmic walls crossed by cosmic strings are obtained from Riemann–Cartan (RC) geometry. The matter density of the planar wall is maximum at the point where the cosmic string crosses the cosmic wall. Cartan torsion has support on the cosmic string given by the Dirac δ-function. Off the sources we are left with a torsionless vacuum. It is suggested that this hybrid defect geometry with torsion may serve as a model for a spinning string from a quark which ends on an axionic domain wall.
NOTE ON THE BOUNDARY TERMS IN AdS/CFT CORRESPONDENCE FOR RARITA–SCHWINGER FIELD
Authors: RASHKOV R. C.
Published: May 2003

In this letter the boundary problem for massless and massive Rarita–Schwinger fields in the AdS/CFT correspondence is considered. The considerations are along the lines of a paper by Henneaux24 and are based on the requirement that the solutions have to be a stationary point for the action functional. It is shown that this requirement, along with a definite asymptotic behavior of the solutions, fixes the boundary term that must be added to the initial Rarita–Schwinger action. It is also shown that the boundary term reproduce the known two-point correlation functions of certain local operators in CFT living on the boundary.
Z-DECAYS TO b QUARKS AND THE HIGGS BOSON MASS
Authors: FIELD J. H.
Published: May 2003

A model independent analysis of the most recent averages of precision electroweak data from LEP and SLD finds a 3σ deviation of the parameter Ab from the standard model prediction. The fitted value of mH shows a strong dependence on the inclusion or exclusion of b quark data, and the standard model fits have poor confidence levels of a few percent when the latter are included. The good fits obtained to lepton data, c quark data and the directly measured top quark mass, give [Formula: see text] and indicate that the Higgs boson mass is most likely less than 200 GeV.
CRITICAL BEHAVIOR IN THE ROTATING D-BRANES
Authors: CAI RONG-GEN , SOH KWANG-SUP
Published: May 2003

We investigate the critical behavior near the thermodynamically stable boundary for the rotating D3-, M5- and M2-branes. The static scaling laws are found to hold. The critical exponents characterizing the scaling behaviors of susceptibilities are the same and all equal 1/2 in all cases. Using the scaling laws related to the correlation functions, we predict the critical exponents of the two-point correlation function of the corresponding conformal fields. We find that the stable boundary is shifted in the different ensembles and there does not exist the stable boundary in the canonical ensemble for the rotating M2-branes.
QUARK MASS MATRICES AND OBSERVABLE QUANTITIES
Authors: FALCONE D.
Published: May 2003

A nearly historical account of quark mass matrix models is given, and the structure of quark mass matrices in the standard model is studied. For a minimal parameter basis suggested earlier, where Mu is diagonal and Md11, Md13, Md31 are zero, the dependence of mass matrices on the CP violating phase δ of V CKM is reported: all parameters are almost independent, except Md22 and Md23, and the equality |Md22| = Md23 is obtained for a value of δ very close to the value which is favored by experiments. Moreover, on this basis, Md12≃Md21 and Md33≃2Md32. Some comments on mass matrices in left–right symmetric models are added.
A GEOMETRICAL PARTICLE MODEL FOR ANYONS
Authors: NERSESSIAN ARMEN , RAMOS EDUARDO
Published: May 2003

We consider the simplest geometrical particle model associated with light-like curves in (2+1) dimensions. The action is proportional to the pseudo-arc length of the particle's path. We show that under quantization, it yields the (2+1)-dimensional anyonic field equation supplemented with a Majorana-like relation on mass and spin, i.e. mass × spin =α2, with α the coupling constant in front of the action.
GLOBAL ANOMALY MATCHING IN SUPERSYMMETRIC GAUGE THEORIES
Authors: WU SIYE
Published: May 2003

We study the global anomaly matching condition in N=1 supersymmetric gauge theories. The condition provides an extra test, apart from the 't Hooft anomaly matching condition, to the validity of low energy descriptions in terms of gauge invariant composites or electric–magnetic duality.
OSCILLATING NON-SINGULAR RELATIVISTIC SPHERICAL MODEL
Authors: DADHICH NARESH , RAYCHAUDHURI A. K.
Published: May 2003

A particular choice of the time function in the recently presented spherical solution by Dadhich1 leads to a singularity free cosmological model which oscillates between two regular states. The energy–stress tensor involves anisotropic pressure and a heat flux term but is consistent with the usual energy conditions (strong, weak and dominant). By choosing the parameters suitably one can make the model consistent with observational data. An interesting feature of the model is that it involves blue shifts as in the quasi steady state model2 but without violating general relativity.
AdS3/CFT2 CORRESPONDENCE AT FINITE TEMPERATURE
Authors: CHEKHOV L.
Published: May 2003

The AdS/CFT correspondence is established for the AdS3 space compactified on a solid torus with the CFT field on the boundary. Correlation functions that correspond to the bulk theory at finite temperature are obtained in the regularization a la Gubser, Klebanov, and Polyakov. The BTZ black hole solutions in AdS3 are T-dual to the solution in the AdS3 space without singularity.
THE KOSZUL–TATE COHOMOLOGY IN COVARIANT HAMILTONIAN FORMALISM
Authors: MANGIAROTTI LUIGI , SARDANASHVILY GENNADI
Published: May 2003

We show that, in the framework of covariant Hamiltonian field theory, a degenerate almost regular quadratic Lagrangian L admits a complete set of non-degenerate Hamiltonian forms such that solutions of the corresponding Hamilton equations, which live in the Lagrangian constraint space, exhaust solutions of the Euler–Lagrange equations for L. We obtain the characteristic splittings of the configuration and momentum phase bundles. Due to the corresponding projection operators, the Koszul–Tate resolution of the Lagrangian constraints for a generic almost regular quadratic Lagrangian is constructed in an explicit form.
QUANTUM GROUP SUq(1,1) FOR COMPLEX q-DEFORMATION
Authors: JOHAL RAMANDEEP S. , GUPTA RAJ K.
Published: May 2003

Based on our recent formulation of the complex q-deformed oscillator, we present here a realization of the positive discrete series of SU q(1,1) algebra, which follows closely a realization obtained similarly for SU q(2) algebra for the case of any arbitrary complex q-deformation (q=ea+ib). For the parameters (a,b)≪1, the eigenvalues of the Casimir of SU q(1,1) are real, even for complex q-deformation.
SUPERSYMMETRIC EXTENSION OF MOYAL ALGEBRA AND ITS APPLICATION TO THE MATRIX MODEL
Authors: MASUDA TAKUYA , SAITO SATORU
Published: May 2003

We construct operator representation of Moyal algebra in the presence of fermionic fields. The result is used to describe the matrix model in Moyal formalism that treat gauge degrees of freedom and outer degrees of freedom equally.
CHARGED RIGHT-HANDED CURRENTS IN THE LEPTOQUARK–BILEPTON FLAVOR DYNAMICS
Authors: MACHADO A. A. , PISANO F.
Published: May 2003

Flavor dynamics chiral models of leptoquark fermions and bilepton gauge bosons with masses up to a few TeV, although coincident with physics of the Fermi scale standard model, address the fermion mass hierarchy and explain the flavor question. The presence of charged right-handed weak currents coupled to bileptons, which we point out here, is another feature of these chiral semisimple gauge theories.
TWO-LOGARITHM MATRIX MODEL WITH AN EXTERNAL FIELD
Authors: CHEKHOV L. , PALAMARCHUK K.
Published: May 2003

We investigate the two-logarithm matrix model with the potential XΛ+α log (1+X)+β log (1-X) related to an exactly solvable Kazakov–Migdal model. In the proper normalization, using Virasoro constraints, we prove the equivalence of this model and the Kontsevich–Penner matrix model and construct the 1/N-expansion solution of this model.
REALIZATION OF SUPERSYMMETRIC SINE ALGEBRA AND QUANTUM SUPERALGEBRA Uq(sl(2/1))
Authors: JELLAL A.
Published: May 2003

We give a realization of the supersymmetric sine algebra (SSSA) in terms of the Lie algebra of infinite matrix [Formula: see text] supplemented by a fermionic algebra. Relying on the fact that the quantum superalgebra U q( sl (2/1)) can be constructed from SSSA, it is shown that there is a possibility to realize U q( sl (2/1)).
THERMODYNAMIC BETHE ANSATZ EQUATION FOR osp(1|2) INTEGRABLE SPIN CHAIN
Authors: SAKAI KAZUMITSU , TSUBOI ZENGO
Published: May 2003

The thermodynamic Bethe ansatz is applied to a quantum integrable spin chain associated with the Lie superalgebra osp (1|2). Using the string hypothesis, we derive a set of infinite number of nonlinear integral equations (thermodynamic Bethe ansatz equation), which characterize the free energy. The low temperature limit of the free energy is also discussed.
NEUTRINO–ELECTRON PROCESSES IN A STRONG MAGNETIC FIELD AND PLASMA
Authors: KUZNETSOV A. V. , MIKHEEV N. V.
Published: May 2003

The total set of the neutrino–electron processes in the presence of both components of an active medium, hot dense plasma and strong magnetic field, is investigated for the first time. The contribution of the processes νe-→νe-, νe+→νe+, ν→νe-e+, νe-e+→ν is shown to dominate and not to depend on the chemical potential of electron–positron gas. Relatively simple expressions for the probability and mean losses of the neutrino energy and momentum are obtained, which are suitable for a quantitative analysis.
FATHER TIME II: A PHYSICAL BASIS BEHIND FEYNMAN'S IDEA OF (ANTI)PARTICLES MOVING BACKWARD IN TIME, AND AN EXTENSION OF THE CPT THEOREM TO INCLUDE NONLOCAL GAUGE FIELDS
Authors: DASTIDAR T. K. RAI , DASTIDAR KRISHNA RAI
Published: May 2003

It was demonstrated in a recent paper (Mod. Phys. Lett.A13, 1265 (1998); hep-th/9902020) that the existence of a nonthermodynamic arrow of time at the atomic level is a fundamental requirement for conservation of energy in matter-radiation interaction. Since the universe consists of only — energy and massive matter — we argue that as a consequence of this earlier result, particles and antiparticles must necessarily move in opposite directions in time. Our result further indicates that the CPT theorem can be extended to cover nonlocal gauge fields.
LAX TENSORS, KILLING TENSORS AND GEOMETRIC DUALITY
Authors: BALEANU DUMITRU , KARASU AYŞE KALKANLI
Published: May 2003

The solution of the Lax tensor equations in the case Lαβγ= -Lβαγ was analyzed. The Lax tensors on the dual metrics were investigated. We classified all two-dimensional metrics having the symmetric Lax tensor Lαβγ. The Lax tensors of the flat space, Rindler system and its dual were found.
YANG–MILLS INSTANTONS ON SEVEN-DIMENSIONAL MANIFOLD OF G2 HOLONOMY
Authors: MIYAGI SAYURI
Published: May 2003

We investigate Yang–Mills instantons on a seven-dimensional manifold of G2 holonomy. By proposing a spherically symmetric ansatz for the Yang–Mills connection, we have ordinary differential equations as the reduced instanton equation, and give some explicit and numerical solutions.
THE HIGGS MASS FROM A POSITIVITY CONDITION AT FINITE TEMPERATURE
Authors: AL-NAGHMOUSH ALI , AL-THOYAIB SULEIMAN S. , TAHA M. O.
Published: May 2003

We impose the condition that the eigenvalues of the mass-matrix in the shifted Lagrangian density of the standard model be positive at the minimum ϕ=ϕ0(λ, g, T) of the one-loop effective potential at finite temperature. This leads to a determination of a critical temperature T c =65 GeV and a critical scalar coupling λ c =1.13. The value of the Higgs mass is m H =151 GeV. These results appear to be gauge-independent.
ON THE CONSISTENCY PROBLEM OF INTERACTIONS OF (2+1) MASSIVE SPINNING PARTICLE
Authors: ALKALAEV K. B. , LYAKHOVICH S. L.
Published: May 2003

We study the problem of consistently introducing interactions in a system possessing gauge symmetry in the case of (2+1)-dimensional massive spinning particle model. The most general action functional of the model is constructed and the particular class of actions is specified provided that the corresponding gauge algebra is not broken by inhomogeneous external fields. We show that the consistency problem is not exhausted by a non-contradictory deformation of the gauge symmetries only, it may appear again as a requirement of a global compatibility between the first- and second-class constraints. These new compatibility conditions are formulated as a general criterion which fixes, being applied to the particle, the gyromagnetic ratio value as g=2.
A CONFIGURATION OF 11-DIMENSIONAL CURVED SUPERSPACE AS BACKGROUND FOR SUPERMEMBRANE
Authors: YUUICHIROU SHIBUSA
Published: May 2003

We calculate all of vielbein superfields up to second order in anticommuting coordinates in terms of the component fields of 11-dimensional on-shell supergravity by using "gauge completion". This configuration of superspace holds the κ-symmetry for supermembrane Lagrangian and represents 11-dimensional on-shell supergravity.
HEAVY QUARK LIFETIMES, MIXING AND CP VIOLATION
Authors: BLAYLOCK GUY
Published: May 2003

This paper emphasizes four topics that represent some of the year's highlights in heavy quark physics. First of all, a review is given of charm lifetime measurements and how they lead to better understanding of the mechanisms of charm decay. Secondly, the CLEO collaboration's new search for charm mixing is reported, which significantly extends the search for new physics in that sector. Thirdly, important updates in Bs mixing are summarized, which result in a new limit on ΔMs, and which further constrain the unitarity triangle. Finally, the first efforts to measure CP violation in the B system are discussed. Results are shown for the CDF and ALEPH measurements of sin 2β, as well as the CLEO branching fraction measurements of B→Kπ, ππ, which have implications for future measurements of α.
CLASSIFYING REPORTED AND "MISSING" RESONANCES ACCORDING TO THEIR P and C PROPERTIES
Authors: KIRCHBACH M.
Published: May 2003

The Hilbert space ℋ3q of the three quarks with one excited quark is decomposed into Lorentz group representations. It is shown that the quantum numbers of the reported and "missing" resonances fall apart and populate distinct representations that differ by their parity or/and charge conjugation properties. In this way, reported and "missing" resonances become distinguishable. For example, resonances from the full listing reported by the Particle Data Group are accommodated by Rarita–Schwinger (RS) type representations [Formula: see text] with k=1, 3, and 5, the highest spin states being J=3/2-, 7/2+, and 11/2+, respectively. In contrast to this, most of the "missing" resonances fall into the opposite parity RS fields of highest-spins 5/2-, 5/2+, and 9/2+, respectively. Rarita–Schwinger fields with physical resonances as lower-spin components can be treated as a whole without imposing auxiliary conditions on them. Such fields do not suffer the Velo–Zwanziger problem but propagate causally in the presence of electromagnetic fields. The pathologies associated with RS fields arise basically because of the attempt to use them to describe isolated spin-J=k+½ states, rather than multispin-parity clusters. The positions of the observed RS clusters and their spacing are well explained trough the interplay between the rotational-like [Formula: see text]-rule and a Balmer-like [Formula: see text]-behavior.
CORRECT TREATMENT OF $\bm{{1\over (\eta\cdot{\lc{k}})^{\lc{p}}}}$ SINGULARITIES IN THE AXIAL GAUGE PROPAGATOR
Authors: JOGLEKAR SATISH D. , MISRA A.
Published: May 2003

The propagators in axial-type, light-cone and planar gauges contain [Formula: see text]-type singularities. These singularities have generally been treated by inventing prescriptions for them. In this work, we propose an alternative procedure for treating these singularities in the path integral formalism using the known way of treating the singularities in Lorentz gauges. To this end, we use a finite field-dependent BRS transformation that interpolates between Lorentz-type and the axial-type gauges. We arrive at the ε-dependent tree propagator in the axial-type gauges. We examine the singularity structure of the propagator and find that the axial gauge propagator so constructed has no spurious poles (for real k). It however has a complicated structure in a small region near η·k=0. We show how this complicated structure can effectively be replaced by a much simpler propagator.
SOLITONS OF SCALAR FIELD WITH INDUCED NONLINEARITY AND THEIR STABILITY
Authors: SAHA BIJAN
Published: May 2003

Exact particle-like static, spherically and/or cylindrically symmetric solutions to the equations of interacting scalar and electromagnetic field system have been obtained. We considered FRW and Gödel universes as external gravitational field with spherical and cylindrical symmetry respectively. Beside the usual solitons some special regular solutions know as droplets, antidroplets and hats (confined in finite interval and having trivial value beyond it) have been obtained. It has been shown that in FRW space–time equations with different interaction terms may have stable solutions while within the scope of Gödel model only the droplet-like and the hat-like configurations may be stable, providing they are located in the region where g00>0.
ON SIGNATURE TRANSITION IN ROBERTSON–WALKER COSMOLOGIES
Authors: GHAFOORI-TABRIZI K. , GOUSHEH S. S. , SEPANGI H. R.
Published: May 2003

We analyze a classical model of gravitation coupled to a self-interacting scalar field. We show that, within the context of this model for Robertson–Walker cosmologies, there exist solutions in the spatially non-flat cases exhibiting transitions from a Euclidean to a Lorentzian space–time. We then discuss the conditions under which these signature changing solutions to Einstein's field equations exist. In particular, we find that an upper bound for the cosmological constant exists and that close to the signature changing hypersurface, both the scale factor and the scalar field have to be constant. Moreover we find that the signature changing solutions do not exist when the scalar field is massless.
TYPE II VERTEX OPERATORS FOR THE $\bm{A_{\lc{n}-1}^{(1)}}$ FACE MODEL
Authors: FURUTSU H. , KOJIMA T. , QUANO Y.-H.
Published: May 2003

Presented is a free boson representation of type II vertex operators for the [Formula: see text] face model. Using the bosonization, we derive some properties of type II vertex operators, such as commutation, inversion and duality relations.
ON THE QUANTUM COHOMOLOGY RINGS OF GENERAL TYPE PROJECTIVE HYPERSURFACES AND GENERALIZED MIRROR TRANSFORMATION
Authors: JINZENJI MASAO
Published: May 2003

In this paper, we study the structure of the quantum cohomology ring of a projective hypersurface with nonpositive first Chern class. We prove a theorem which suggests that the mirror transformation of the quantum cohomology of a projective Calabi–Yau hypersurface has a close relation with the ring of symmetric functions, or with Schur polynomials. With this result in mind, we propose a generalized mirror transformation on the quantum cohomology of a hypersurface with negative first Chern class and construct an explicit prediction formula for three-point Gromov–Witten invariants up to cubic rational curves. We also construct a projective space resolution of the moduli space of polynomial maps, which is in good correspondence with the terms that appear in the generalized mirror transformation.
DERIVATION OF A NOVEL RELATION BETWEEN THE MASSES OF THE TOP-QUARK AND AN ELECTROWEAK SCALAR
Authors: LEMKE E. H.
Published: May 2003

We start with generating the masses of the charged leptons by gap equations. Then we present analogous radiative masses of the electroweak vector-bosons. We derive them from the global SU (2)L× U (1) symmetry without making recourse to any scalar fields or spontaneous breaking of gauge symmetry. Nevertheless, we find the mixing angle relation [Formula: see text]. Moreover, we find that the radiatively generated masses of Z and W require the existence of a cutoff energy of the order of 1014 GeV, which is just the grand-unification energy scale. We then eliminate the cutoff by renormalizing the two coupling constants and arrive at a function between mW and m top if mZ, [Formula: see text] and sin 2θ eff are given. Comparison with the electroweak precision data shows that the predicted value of mW does reproduce the experimental data though the vacuum loops of the leptons, of the light quarks as well as of possible scalar particles have been ignored. Then, we introduce a doublet of scalar bosons to investigate its effect on the mW prediction. We fix its couplings to the photon, to W as well as Z by localizing SU (2)L× U (1). The radiative mZ and mW results interdict a spontaneous breaking of the gauge symmetry. So there are an elementary charged and neutral scalar field. Their masses are identical. We show that there is no radiative effect of these scalars on the masses of W and Z. However, the scalar fields affect the coupling constants and, by this, the relationship between mW and m top alters. We calculate the modifications and find a relatively small effect. It seems to be comparable in magnitude with the QCD-corrections of the loops of vacuum polarization. Substituting the experimental mW value, we get a relation between m top and m scalar . The mass of the top-quark is increasing with increasing m scalar . In the standard model, m top also increases with increasing m Higgs . The effect of the elementary scalar is however much weaker.
GAUGE TRANSFORMATION PROPERTIES OF VECTOR AND TENSOR POTENTIALS REVISITED: A GROUP QUANTIZATION APPROACH
Authors: CALIXTO M. , ALDAYA V.
Published: May 2003

The possibility of nontrivial representations of the gauge group on wave functionals of a gauge invariant quantum field theory leads to a generation of mass for intermediate vector and tensor bosons. The mass parameters m show up as central charges in the algebra of constraints, which then become of second-class nature. The gauge group coordinates acquire dynamics outside the null-mass shell and provide the longitudinal field degrees of freedom that massless bosons need to form massive bosons. This is a non-Higgs mechanism that could provide new clues for the best understanding of the symmetry breaking mechanism in unified field theories. A unified quantization of massless and massive non-Abelian Yang–Mills, linear gravity and Abelian two-form gauge field theories are fully developed from this new approach, where a cohomological origin of mass is pointed out.
PHASE TRANSITION COUPLINGS IN U(1) and SU(N) REGULARIZED GAUGE THEORIES
Authors: LAPERASHVILI L. V. , RYZHIKH D. A. , NIELSEN H. B.
Published: May 2003

Using a two-loop approximation for β functions, we have considered the corresponding renormalization group improved effective potential in the dual Abelian Higgs model (DAHM) of scalar monopoles and calculated the phase transition (critical) couplings in U(1) and SU (N) regularized gauge theories. In contrast to our previous result α crit ≈0.17, obtained in the one-loop approximation with the DAHM effective potential (see Ref. 20), the critical value of the electric fine structure constant in the two-loop approximation, calculated in the present paper, is equal to α crit ≈0.208 and coincides with the lattice result for compact QED10: [Formula: see text]. Following the 't Hooft's idea of the "Abelization" of monopole vacuum in the Yang–Mills theories, we have obtained an estimation of the SU (N) triple point coupling constants, which is [Formula: see text]. This relation was used for the description of the Planck scale values of the inverse running constants [Formula: see text] (i= 1, 2, 3 correspond to U(1), SU(2) and SU(3) groups), according to the ideas of the multiple point model.16
QUASI-EXACTLY SOLVABLE APPROACH TO THE JAYNES–CUMMINGS MODEL WITHOUT ROTATION WAVE APPROXIMATION
Authors: DEBERGH N. , KLIMOV A. B.
Published: May 2003

The Jaynes–Cummings model (JCM) is studied in the frame of methods of quasi-exactly solvable problems. First, we apply these methods to the JCM under RWA and anti-RWA approximations and then, we analyze the possibility of solving the whole model.
TOROIDAL DNA: TOPOLOGY, GEOMETRY AND ELECTROSTATICS
Authors: SADOC JEAN-FRANÇOIS
Published: May 2003

Toroidal DNA condensates have received considerable attention as a model of ordered DNA condensation. Geometry and topology of fibre bundles can be efficient tools in order to study these structures. Such methods have given fruitful results when considering toroidal vesicles made of amphiphile films and blue phases structures observed in liquid crystals made of long chiral molecules. We give, in this paper, the geometrical arguments supporting this description. Then, we show how electrostatic interactions could be studied using curved spaces. We show that it is possible to have conditions resulting in attractive interaction between DNA molecules in the presence of positive charges.
INTEGRABLE EXTENDED HUBBARD HAMILTONIANS FROM SYMMETRIC GROUP EQUATIONS
Authors: DOLCINI FABRIZIO , MONTORSI ARIANNA
Published: May 2003

We consider the most general form of extended Hubbard Hamiltonian conserving the total spin and number of electrons, and find all the 1-dimensional completely integrable models which can be derived from first degree polynomial solution of the Yang–Baxter equation. It is shown that such models are 96. They are identified with the 16-dimensional representations of the class of solutions of symmetric group relations acting as generalized permutators. As particular examples, the EKS and some other known models are obtained. A method for determining the physical features of the above models is outlined.
TEMPERATURE-DEPENDENT STUDIES IN SOME HOMOLOGUES OF ALKYLOXY CYANOBIPHENYL EMPLOYING POSITRON LIFETIME SPECTROSCOPY
Authors: SHARMA M. , KAUR C. , CHANDRAMANI SINGH K. , JAIN P. C.
Published: May 2003

Some homologues of alkyloxy cyanobipheny1 (6OCB, 8OCB, 9OCB, 10OCB) have been investigated by employing positron lifetime spectroscopy. In each of these compounds, temperature dependent positron lifetime measurements have been carried out, both in the heating as well as cooling cycles. Besides detecting many interesting features like solid-crystalline polymorphism, anti-parallel bimolecular association, formation of cybotactic groups in the nematic phase, positron annihilation parameters have been able to reveal anomalous structural changes taking place in these compounds.
EXPERIMENTAL OBSERVATIONS OF SURFACE FREEZING
Authors: MAEDA NOBUO , YAMINSKY VASSILI V.
Published: May 2003

Capillary phase transitions and those induced by interfaces, like pre-melting, have been studied for decades. The related phenomenon of surface freezing has not been explored so extensively. We review experiments on surface freezing, those of long-chain n-alkanes in particular, and place the results within the wider thermodynamic framework of surface phase transitions. Surface freezing plays an important role in nucleation and crystallization of bulk long-chain n-alkanes. Implications for capillary melting and freezing of substances at nanoscales are discussed. Theoretical aspects of condensed capillary phase transitions will be reviewed separately.
OPTICAL EXCITATIONS IN DIPHENYLACETYLENE BASED DENDRIMERS STUDIED BY A COUPLED EXCITON MODEL WITH OFF-DIAGONAL DISORDER
Authors: HARIGAYA KIKUO
Published: May 2003

A phenomenological coupled exciton model is proposed in order to characterize optical excitations in extended dendrimers. An onsite exciton state is assigned at each phenyl rings and a nearest neighbor hopping integral which obeys the Gaussian distribution is considered between the exciton states. The decreasing optical excitation energy with respect to the dendrimer size indicates the presence of exciton funnels along the backbone of the dendrimers. Therefore, the extended dendrimers can work as artificial fractal antenna systems which capture energy of light. Dynamics of an exciton is also investigated by solving time development of a wavefunction of optical excitations. It is shown that a damping term with a certain magnitude is necessary in order that optical excitations captured at the outer edge of the supermolecule move to the central areas of the molecule.
MICROSTRUCTURES AND OPTICAL PROPERTIES OF STRONTIUM TITANATE NANOCRYSTALS PREPARED BY A STEARIC-ACID GEL PROCESS
Authors: ZHANG WEI-FENG , XING QIAN , HUANG YA-BIN
Published: May 2003

SrTiO3 nanocrystals with grain sizes from 26 to 86 nm were prepared by stearic-acid gel method. The microstructures, lattice vibration and luminescence spectra were examined by X-ray diffraction, infrared, Raman and photoluminescence (PL) spectroscopies. Hydroxyl defects were clearly found by infrared spectroscopy in the SrTiO3 nanocrystals. Raman measurement results showed that internal stress exists in the SrTiO3 nanocrystals, which induces first-order Raman scattering processes. Strong visible PL near 2.62 eV was observed under 3.54 eV light excitation in small SrTiO3 nanocrystals. Grain-size dependence of the PL spectrum is investigated and the origin for the PL is attributed to a charge transfer via intrinsic defects inside an oxygen octahedron.
FERRIMAGNETISM IN TWO-DIMENSIONAL MIXED-SPIN ISING MODEL
Authors: BOECHAT BEATRIZ , FILGUEIRAS R. , MARINS L. , CORDEIRO CLAUDETTE , BRANCO N. S.
Published: May 2003

We investigate the mixed-spin (spin-1/2 and spin-1) antiferromagnetic Ising model in two dimensions through a real-space renormalization group transformation. The model includes nearest and next-nearest neighbor interactions and is suitable to describe ferrimagnetic ordering. We present the finite-temperature phase diagram of the model. The presence of the second-neighbor bonds enlarge the ferrimagnetic phase. Our results do not indicate the existence of a tricritical point, contrary to previous effective-field calculations.
THE CHARGE-DENSITY WAVE INDUCED BY INTERCHAIN COUPLING IN π-CONJUGATED ORGANIC FERROMAGNETS
Authors: TIAN J. P. , WANG W. Z.
Published: May 2003

Considering the itineracy of electrons, electron–phonon coupling, the Hubbard repulsion and interchain coupling, we deal with two neighboring-conjugated organic ferromagnetic chains with a numerical method. The interchain coupling is considered as an interchain electron-transfer term, which is different with respect to different sites in chains. The result shows that the interchain coupling can result in a charge-density wave (CDW) along the main chain and a spin-density transfer between the main chain and the side radicals.
LINEAR PREDICTIVE CODING IN A NEW BINARY SYSTEM
Authors: TIWARI M. , DUBEY R. K. , MISHRA P. K. , ROY K. C.
Published: May 2003

Linear Predictive Coding is applied for transmitting the samples in a binary system consisting of (+1,-1). This binary system provides a unified method of encoding signed quantities. All the pole filters used in the LPC have been achieved with different algorithms. LPC in this system is found to be suitable for encoding signed numbers in unified way.
A NOVEL ADIABATIC REGISTER FILE DESIGN
Authors: NG K. W. , LAU K. T.
Published: May 2003

A novel 8-word × 16-bit adiabatic register file is designed. The adiabatic circuits are based on the Pass-transistor Adiabatic Logic with NMOS pull-down configuration (PAL-2N). Using adiabatic switching technique, the power consumption of the register file is significantly reduced as the energy transferred to the large capacitance buses is mostly recovered. HSPICE simulation results have shown power savings of more than 77% as compared to the conventional CMOS implementation. Although the proposed register file is designed with only one read port and one write port, multiple read and/or write ports can be easily constructed by adding additional read and/or write port transistors.
DECOMPOSITION OF BUS-INVERT CODING FOR LOW-POWER I/O
Authors: HONG SUNGPACK , KIM TAEWHAN , NARAYANAN UNNI , CHUNG KI-SEOK
Published: May 2003

This paper proposes a new bus-invert coding scheme for reducing the number of bus transitions. Unlike the previous schemes in which the entire bus lines or one subset of the bus lines are considered for bus-invert coding, in the proposed scheme, the bus lines are partitioned and each partitioned group is considered independently for bus-invert coding to maximize the effectiveness of reducing the total number of bus transitions. Experimental results show that the decomposed bus-invert coding scheme reduces the total number of bus transitions by 47.2% and 11.9% on average than those of the conventional and the partial bus-invert coding schemes respectively.
TDMA SECURE COMMUNICATION SCHEME BASED ON SYNCHRONIZATION OF CHUA'S CIRCUITS
Authors: HE ZHENYA , LI KE , YANG LUXI , SHI YUHUI
Published: May 2003

A novel Time Division Multiple Access (TDMA) secure communication scheme is proposed based on sporadic coupling chaos synchronization. Compared with conventional chaos masking method, it has higher noise-resistibility, better security and frequency efficiency, etc. Simulation results illustrate the effectiveness and efficiency of this method. Finally, we analyze factors which affect system ability and give some conclusions.
PERFORMANCE ANALYSIS OF FREQUENCY-HOPPED PACKET RADIO NETWORKS WITH SPATIALLY DISTRIBUTED USERS-COMBINED ERROR AND ERASURE DECODING CONSIDERED
Authors: MOHAMED KHAIRI ASHOUR , PAP LÁSZLÓ
Published: May 2003

This paper is concerned with the performance analysis of frequency-hopped packet radio networks with random spatial distribution of users. Depending on their relative energies, hits may either cause errors, erasures, or be ineffective. Combined error and erasure Reed Solomon decoding is used. Two types of hopping patterns are considered, namely random and one-coincidence patterns. Using a novel technique of the joint probability generating functions of the so called effective interference vectors, general closed form expressions for packet capture probabilities are derived. Numerical results indicate that, depending on the coding rate and traffic levels, larger values of the throughput can be achieved by using either error only or erasure only decoding.