bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation and Characterization of Electrodes Modified with Metalloporphyrins. Application to Reduction of Nitrite
Authors: Armijo Francisco , Trollund Ejnar , Reina Matías , Arévalo M. Carmen , Aguirre M. Jesús
Published: September 2003

Six type-modified electrodes by electropolymerization of tetrakis(x-aminophenyl)porphyrins, where x = 2, 3 or 4, and their Cu(II) and Ni(II) complexes in HCl solution were prepared and characterized by cyclic voltammetry, atomic force microscopy and UV-VIS spectroscopy. The morphology of the polymers depends on the position of the amino groups. The modified electrodes show interesting electrocatalytic activity toward reduction of nitrites. The catalytic behavior strongly depends on the nature of the metal and the position of the amino groups.
A Methane Sensor Based on Poly[3',4'-dihexyl-4,4''-bis(pentyloxy)-2,2':5',2''-terthiophene]
Authors: Casalbore-Miceli Giuseppe , Zanelli Alberto , Geri Alessandro , Gallazzi Maria C.
Published: September 2003

3',4'-Dihexyl-4,4''-bis(pentyloxy)-2,2':5',2''-terthiophene was electrochemically polymerized on gold interdigitated electrodes to investigate the impedance variation of the polymer in the exposure to air/methane atmospheres. The higher sensitivity of poly[3',4'-dihexyl-4,4''-bis(pentyloxy)2,2';5',2''-terthiophene] (PHPT) to methane was observed at frequencies of about 100 Hz. The PHPT impedance decreases when the CH4 concentration increases and shows the highest sensitivity at the lowest methane concentrations. After each concentration step, the impedance decreased as the square root of time indicating that the response time of the PHPT-based sensor was controlled by diffusion of the gas into the material. It is suggested that the absorption of methane into the polymer film affects the rate of interchain charge hopping.
Variable carbon-sink strength of different Glomus mosseae strains colonizing barley roots
Authors: Lerat Sylvain , Lapointe Line , Piché Yves , Vierheilig Horst
Published: September 2003

Root carbon (C) partitioning was investigated in barley (Hordeum vulgare L.) colonized by one of three strains of the arbuscular mycorrhizal fungus (AMF) Glomus mosseae (Nicolson & Gerdemann) Gerd. & Trappe. The roots of each plant were evenly divided between two compartments of a split-root system and one side was inoculated with one of the three AMF strains. Twenty-three days after inoculation barley shoots were labeled with 14CO2. Twenty-four hours later, plants were harvested and the mycorrhizal (M) and nonmycorrhizal (NM) roots were analyzed separately for 14C. Partitioning of C between M and NM sides differed between the fungal strains: BEG 54 was a strong C sink, BEG 55 was a moderately strong C sink, and BEG 12 showed similar C-sink strength as the non-inoculated control plants. The observed differences in C-sink strength mirrored differences in plant dry biomass. Total plant dry biomass of plants inoculated with BEG 12, BEG54, and BEG 55 represented 81.3%, 65.3%, and 73.4% of the biomass of the control plants, respectively. This paper is the first report of an AMF strain-specific variation of C partitioning in M plants in a split-root system.Key words: arbuscular mycorrhizal fungi, barley (Hordeum vulgare), carbon sink, Glomus mosseae, strain variability.
Impacts of golf course construction and operation on headwater streams: bioassessment using benthic algae
Authors: Winter Jennifer G , Dillon Peter J , Paterson Carolyn , Reid Ron A , Somers Keith M
Published: September 2003

The influence of golf course operation and construction on benthic algal communities in headwater streams on the Precambrian Shield was investigated using a reference condition approach. Streams were sampled for water chemistry and epilithic benthic algae on operational golf courses, on courses under construction, and from nearby minimally impacted reference locations. Epilithic diatom community structure was different in reference streams than in operational golf course streams, the latter indicating nutrient enrichment, higher pH, and disturbance. Full counts of diatoms and soft algae revealed that there was a lower proportion of diatoms relative to other algal groups, cyanobacteria in particular, in operational golf course streams compared with samples from reference locations. Dominance by a single taxon was also significantly higher in operational golf course streams. Although differences relative to the reference streams were less marked for the streams on courses under construction, full counts of diatoms and soft algae provided evidence of disturbance and nutrient enrichment. In particular, high proportions of filamentous green algae were recorded. Overall, our results indicate that golf course land management on the Shield is associated with significant differences in the abundance of certain benthic algal taxa in headwater streams.Key words: diatoms, periphyton, biomonitoring, golf courses, canonical correspondence analysis (CCA), Precambrian Shield.
Continental tholeiitic mafic rocks of the Paleoproterozoic Hurwitz Group, Central Hearne sub-domain, Nunavut: insight into the evolution of the Hearne sub-continental lithosphere
Authors: Sandeman H A , Cousens B L , Hemmingway C J
Published: September 2003

The Paleoproterozoic Hurwitz Group of the western Churchill Province is an erosional remnant of an areally extensive, predominantly shallow-water intracratonic basin comprised of four major sequences. Sequence 2, forming the central part of the stratigraphy, contains the Ameto Formation, a sequence of pillowed and massive basaltic rocks and associated gabbro sills termed the Happotiyik Member that are interlayered with subordinate deep-water mudstones, siltstones, and diamictites. Whole-rock geochemical data for the mafic rocks reveals a suite of homogeneous tholeiitic basalts with affinities to both continental and volcanic-arc tholeiites. Compatible trace elements and large-ion lithophile elements exhibit scattered behavior, whereas all high field strength elements show a systematic increase with Zr. The rocks are large-ion lithophile and light rare-earth element enriched, and have parallel primitive mantle normalized extended trace element patterns with prominent negative Nb, Ta, and Ti anomalies. εNd(t=2200 Ma) values for the rocks range from 0.0 to +0.8. The data indicate that the parental magmas were derived from a heterogeneous, predominantly depleted mantle source that included a minor metasomatically enriched component. Contamination by Neoarchean, juvenile silicic upper crust during ascent was minimal. We envisage that the rocks of the Happotiyik Member were generated from sub-continental lithospheric mantle that was stabilized immediately after formation of the ca. 2680 Ma, Neoarchean Central Hearne sub-domain. This enrichment occurred via metasomatic infiltration of subduction-derived fluids and melts into the overlying lithosphere. A wide range of Paleoproterozoic intra-continental mafic rocks in the western Churchill Province exhibit comparable geochemical and isotopic signatures that suggest an origin in the lithospheric mantle. These observations imply that the Hearne sub-continental lithospheric mantle has endured since the Neoarchean and likely persists today.
A study of the tectonically active Marmara region, Turkey, using a global positioning system (GPS)
Authors: Dogan U , Lachapelle G , Fortes L , Ergintav S
Published: September 2003

The Marmara region is an active tectonic zone characterized by a transition in the dextral strike-slip regime of the western part of the North Anatolian Fault Zone. The main goal of this paper is to assess the use of global positioning system (GPS) data sets collected during five relatively short time intervals during the period December 2000  March 2002 to detect potential crustal deformations. To determine if the deformations measured with GPS are real or only a data artifact, a statistical reliability analysis of the solutions is performed. The results indicate that each station has statistically different temporal behavior and significant relative motions. This area is consequently still very active, with significant deformation patterns. Although the average magnitude for our estimated displacement rates with respect to ANKR station, which represents the rigid motion of the Anatolian plate, is in the order of 1.1 cm/year in the south of the North Anatolian Fault, it increases to 2.3 cm/year in the northern part of the area.
Post-Paleocene cooling in the southern Canadian Atlantic region: evidence from apatite fission track models
Authors: Grist Alexander M , Zentilli Marcos
Published: September 2003

The traditional view of the geomorphic evolution of the southern Canadian Atlantic margin is one of gradual exhumation and peneplanation following TriassicJurassic rifting. Thermal modelling of apatite fission track data from pre-Carboniferous granitic basement in Nova Scotia and from Permian and Triassic sandstones from Nova Scotia, New Brunswick, and Prince Edward Island suggest a more complex thermal evolution of the onshore part of the margin. Models clearly indicate significantly elevated regional paleotemperatures during Jurassic time, and as much as 30 °C of post-Paleocene cooling. Model-predicted paleogeothermal gradients for granitic samples from the Digby D-1 well are normal, ranging from 15 to 20 °C/km. Post-Paleocene cooling may be attributable to the combined effects of 13 °C of exhumational cooling from erosion of approximately 700 m of post-Aptian sediments caused by decreased eustatic sea levels, and 817 °C of cooling from the propagation to depth of a 1020 °C decrease in paleo-mean annual surface temperatures between Late Cretaceous time and the present. The combined effects of burial heating related to increased eustatic sea level and the propagation to depth of higher paleo-mean annual surface temperatures in the Late Cretaceous may also explain elevated vitrinite reflectance levels in Cretaceous lignites and in Jurassic strata in the Fundy Basin of Nova Scotia. These models demonstrate that the traditional view of passive peneplanation and slow exhumation of the margin since Early Jurassic time is not tenable.
ON THE THEORY OF THE DOPPLER EFFECT IN A MOVING MEDIUM
Authors: BERTOTTI BRUNO
Published: September 2003

The increase in the accuracy of Doppler measurements in space requires a rigorous definition of the observed quantity when the propagation occurs in a moving, and possibly dispersive medium, like the solar wind. This is usually done in two divergent ways: in the phase viewpoint it is the time derivative of the correction to the optical path; in the ray viewpoint the signal is obtained form the deflection produced in the ray. They can be reconciled by using the time derivative of the optical path in the Lagrangian sense, i.e. differentiating from ray to ray. To rigorously derive this result an understanding, through relativistic Hamiltonian theory, of the delicate interplay between rays and phase is required; a general perturbation theorem which generalizes the concept of the Doppler effect as a Lagrangian derivative is proved. Relativistic retardation corrections O(v) are obtained, well within the expected sensitivity of Doppler experiments near solar conjunction.
QUANTUM MECHANICS ON Sn AND MERON SOLUTION
Authors: IKEMORI HITOSHI , KITAKDO SHINSAKU , NAKATANI HAJIME , OTSU HIDEHARU , SATO TOSHIRO
Published: September 2003

A particle in quantum mechanics on manifolds couples to the induced topological gauge field that characterizes the possible inequivalent quantizations. For instance, the gauge potential induced on S2 is that of a magnetic monopole located at the center of S2. We find that the gauge potential induced on S3(S2n+ 1) is that of a meron (generalized meron) also sitting at the center of S3(S2n+ 1).
QUANTUM FLUCTUATIONS OF THE ANGULAR MOMENTUM AND ENERGY OF THE GROUND STATE
Authors: SERGEENKO M. N.
Published: September 2003

Quasiclassical solution of the three-dimensional Schrödinger's equation is given. It is shown apparently that the exitence of nonzero minimal angular momentum M0=ℏ/2 corresponds to the quantum fluctuations of the angular momentum and contributes to the energy of the ground state.
FISHER'S ARROW OF "TIME" IN COSMOLOGICAL COHERENT PHASE SPACE
Authors: FRIEDEN B. ROY , ROSU H. C.
Published: September 2003

Fisher's arrow of "time" in a cosmological phase space defined as in quantum optics (i.e. whose points are coherent states) is introduced as follows. Assuming that the phase space evolution of the universe states from an initial squeezed cosmological state towards a final thermal one, a Fokker–Planck equation for the time-dependent, cosmological Q phase space probability distribution can be written down. Next, using some recent results in the literature, we derive an information arrow of time for the Fisher phase space cosmological entropy based on the Q-function. We also mention the application of Fisher's arrow of time to stochastic inflation models.
PROTON STRUCTURE FUNCTIONS FROM CHIRAL DYNAMICS AND QCD CONSTRAINTS
Authors: WEBER H. J.
Published: September 2003

The spin fractions and deep inelastic lepton structure functions of the proton are analyzed based on chiral field theory invloving Goldstone bosons. A detailed comparison with several recent chiral models sheds light on their successful description of the spin fractions of the proton as being due to neglecting quark masses. Initial quark valence distributions at a higher scale than Λ QCD are constructed using quark counting constraints at large Bjorken x→1 and Regge behavior at small x. Reasonable strange quark distributions are then predicted by chiral field theory. The spin fractions also agree with the data.
DIFFICULTY OF BOUND STATE PROBLEMS IN RELATIVISTIC QUANTUM FIELD THEORY
Authors: YAMAMOTO KUNIO
Published: September 2003

In the previous paper, it has been pointed out that, for any model with real bound state in relativistic quantum field theory, Feynman rules do not give the physical amplitude in which the effects of real bound state are considered. By investigating this fact, it is found that an important guiding principle indispensable to discuss real bound state problems is unknown. The way to investigate this principle is not within the framework of relativistic quantum field theory.
ON THE CLASSICAL LIMIT OF THE GENERALIZED q-DEFORMED SUq(2) AND SUq(1,1) ALGEBRAS
Authors: JOHAL RAMANDEEP S. , GUPTA RAJ K. , SAHAI VIVEK
Published: September 2003

Two explicit q-deformations each of SU(2) and SU(1,1) algebras are constructed by simply imposing the condition of obtaining the limiting classical algebras. No explicit transformations of the generators are used. One construction results in the standard SU q(2) and SU q(1,1) algebras with q-deforming functionals as infinite odd power series of both J3 and the deformation parameter q. The other construction (also with q-deforming functionals as infinite power series) seems to be new, with additional free parameters in both the algebras and Casimirs.
THE CONFORMAL ANOMALY IN GENERAL RANK 1 SYMMETRIC SPACES AND ASSOCIATED OPERATOR PRODUCT
Authors: BYTSENKO A. A. , GONÇALVES A. E. , WILLIAMS F. L.
Published: September 2003

We compute the one-loop effective action and the conformal anomaly associated with the product ⊗pℒp of the Laplace type operators ℒp, p=1,2, acting in irreducible rank 1 symmetric spaces of non-compact type. The explicit form of the zeta functions and the conformal anomaly of the stress-energy momentum tensor is derived.
DILATONIC DARK MATTER — A NEW PARADIGM
Authors: CHO Y. M. , KEUM Y. Y.
Published: September 2003

We study the possibility that the dilaton plays the role of the dark matter of the universe. We find that the condition for the dilaton to be the dark matter of the universe strongly restricts its mass to be around 0.5 keV or 270 MeV. For the other mass ranges, the dilaton either undercloses or overcloses the universe. The 0.5 keV dilaton has the free-streaming distance of about 1.4 Mpc and becomes and excellent candidate of a warm dark matter, while the 270 MeV one has the free-streaming distance of about 7.4 pc and becomes a cold dark matter. We discuss the possible ways to detect the dilaton experimentally.
INTEGRABLE MODELS AND THE HIGHER DIMENSIONAL REPRESENTATIONS OF GRADED LIE ALGEBRAS
Authors: BRUNELLI J. C. , DAS ASHOK
Published: September 2003

We construct a zero curvature formulation, in superspace, for the sTB-B hierarchy which naturally reduces to the zero curvature condition in terms of components, thus solving one of the puzzling features of this model. This analysis, further, suggests a systematic method of constructing higher dimensional representations for the zero curvature condition starting with the fundamental representation. We illustrate this with the examples of the sTB hierarchy and the sKdV hierarchy. This would be particularly useful in constructing explicit higher dimensional representations of graded Lie algebras.
TOPOLOLOGICAL CHIRAL SYMMETRY BREAKING IN SUSY NJL IN CURVED SPACE–TIME
Authors: GRANDA L. N.
Published: September 2003

The effective potential in the model introduced by Buchbinder–Inagaki–Odintsov (BIO)1 which represents SUSY NJL model non-minimally coupled with the external gravitational field is found. The topology of the space is considered to be nontrivial. Chiral symmetry breaking under the action of external curvature and nontrivial topology is investigated.
SQUEEZED STATE REPRESENTATION OF QUANTUM FLUCTUATIONS AND SEMICLASSICAL THEORY
Authors: SURESH P. K. , KURIAKOSE V. C.
Published: September 2003

A squeezed state representation is constructed for each mode of a quantized scalar field in a classical spatially homogeneous anisotropic background cosmology. The expectation values of stress–energy tensor are calculated in squeezed vacuum states. The results for the fluctuations in energy density and anisotropic pressure are also presented.
ROTATION INTRINSIC SPIN EFFECTS AND ITS ASTROPHYSICAL APPLICATION
Authors: ZHANG C. M.
Published: September 2003

On the basis of rotation-spin, torsion-spin and magnetic-spin effects, by which the spin precession arises the polarized magnetic field of neutron star to incline to the rotational axis. In the case of accretion layer structure of the recycled pulsar and the companion star magnetic influence considered, the magnetic inclinations of the recycled pulsars are different from that of the normal radio pulsars. The theoretical conclusions and consistent observational evidence is discussed.
EXCLUSIVE NONLEPTONIC BOTTOM TO CHARM BARYON DECAYS INCLUDING NONFACTORIZABLE CONTRIBUTIONS
Authors: IVANOV M. A. , LYUBOVITSKIJ V. E. , RUSETSKY A. G. , KÖRNER J. G.
Published: September 2003

Exclusive nonleptonic decays of bottom baryons to charm baryons and pseudoscalar light mesons are analyzed within a relativistic three-quark model. We include factorizing as well as nonfactorizing contributions to the decay amplitudes. The total contribution of the nonfactorizing diagrams amount to 30% of the factorizing contributions in amplitude. We present detailed predictions for rates and asymmetry parameters.
16O–16OELASTIC SCATTERING AT 350 MeV AND POLE STRUCTURE OF THE S-MATRIX
Authors: PILIPENKO V. V.
Published: September 2003

The cross-section of the16O –16O elastic scattering at 350 MeV including rainbow-like structures has been described on the basis of an original S-matrix model taking account of the effect of a Regge pole in the first quadrant of the complex l-plane.
DARBOUX PARAMETER FOR EMPTY FRW QUANTUM UNIVERSES AND QUANTUM COSMOLOGICAL SINGULARITIES
Authors: ROSU HARET C.
Published: September 2003

We present the factorization(s) of the Wheeler–De Witt equation for vacuum FRW minisuperspace universes of arbitrary Hartle–Hawking factor ordering, including the so-called strictly isospectral supersymmetric method. By the latter means, one can introduce an infinite class of singular FRW minisuperspace wave functions characterized by a Darboux parameter that mathematically speaking is a Riccati integration constant, while physically determines the position of these strictly isospectral singularities on the Misner time axis.
TRANSVERSE MOMENTUM DEPENDENCE IN THE PERTURBATIVE CALCULATION OF THE PION FORM FACTOR
Authors: CAO FU-GUANG , HUANG TAO
Published: September 2003

Transverse momentum dependence in the perturbative calculation of the pion electromagnetic form factor is re-analyzed. It is found that (a) the intrinsic transverse momentum dependence associated with the pion wave function significantly suppresses perturbative prediction for the pion form factor at the energy region of a few GeV, and (b) the transverse momentum dependence in the fermion propagator of the hard scattering leads to a mild reduction of the perturbative calculation. Our formalism is available for both the intermediate energy region (Q~ a few GeV) and the asymptotic energy region (Q→∞).
DEGENERACY STRUCTURE OF THE CALOGERO–SUTHERLAND MODEL: AN ALGEBRAIC APPROACH
Authors: GURAPPA N. , PANIGRAHI PRASANTA K. , SRINIVASAN V.
Published: September 2003

The degeneracy structure of the eigenspace of the N-particle Calogero–Sutherland model is studied from an algebraic point of view. Suitable operators satisfying SU(2) algebras and acting on the degenerate eigenspace are explicitly constructed for the two-particle case and then appropriately generalized to the N-particle model. The raising and lowering operators of these algebras connect the states, in a subset of the degenerate eigenspace, with each other.
KASHIWARA–MIWA MODEL AND ELLIPTIC IRF HIERARCHIES
Authors: BOOS H. E. , STROGANOV YU. G.
Published: September 2003

Using the "star" construction for the Kashiwara–Miwa model we obtain the set of elliptic solvable IRF models. Part of these models turns out to be some particular case of the cyclic solid-on-solid (CSOS) models.
CONSTRUCTION OF q-SYMMETRIC STATES IN TERMS OF suq(n)-COVARIANT OSCILLATORS
Authors: CHUNG W.-S.
Published: September 2003

The q-symmetric state is constructed by using su q(n)-covariant multimode oscillator and its mode operators are expressed in terms of the q-symmetric states and the q=0 quon oscillators.
N=1 SUPERSYMMETRIC SPIN-CHARGE SEPARATION IN EFFECTIVE GAUGE THEORIES OF PLANAR MAGNETIC SUPERCONDUCTORS
Authors: DIAMANDIS G. A. , GEORGALAS B. C. , MAVROMATOS N. E.
Published: September 2003

We present an N=1 supersymmetric extension of a spin-charge separated effective SU (2)× U S(1) "particle-hole" gauge theory of excitations about the nodes of the gap of a d-wave planar magnetic superconductor. The supersymmetry is achieved without introducing extra degrees of freedom, as compared to the nonsupersymmetric models. The only exception, the introduction of gaugino fields, finds a natural physical interpretation as describing interlayer coupling in the statistical model. The low-energy continuum theory is described by a relativistic (2+1)-dimensional supersymmetric CP1 σ-model with Gross–Neveu–Thirring-type four-fermion interactions. We emphasize the crucial role of the CP1 constraint by inducing a nontrivial dynamical mass generation for fermions (and thus superconductivity), in a way compatible with manifest N=1 supersymmetry. We also give a preliminary discussion of nonperturbative effects. We argue that supersymmetry suppresses the danger of superconductivity instanton contributions to the mass of the perturbatively massless gauge boson of the unbroken U(1) subgroup of SU(2). Finally, we point out the possibility of applying these ideas to effective gauge models of spin-charge separation in one-space dimensional superconducting chains of holons, which, for example, have recently been claimed to be important in the stripe phase of underdoped cuprates.
SEARCH FOR ANOMALY AT HIGH x IN POLARIZED DEEP INELASTIC SCATTERING DATA
Authors: WIŚLICKI WOJCIECH
Published: September 2003

An idea of possible anomalous contribution of nonperturbative origin to the nucleon spin was examined by analyzing data on spin asymmetries in polarized deep inelastic scattering of leptons on nucleons. The region of high Bjorken x was explored. It was shown that experimental data available at present do not exhibit any evidence for this effect.
TWO-PARAMETER DIFFERENTIAL CALCULUS ON THE h-EXTERIOR PLANE
Authors: ÇELIK SULTAN A. , ÇELIK SALIH
Published: September 2003

We construct a two-parameter covariant differential calculus on the quantum h-exterior plane. We also give a deformation of the two-dimensional fermionic phase space.
A COSMOLOGICAL MODEL WITH A GENERALIZED COSMOLOGICAL CONSTANT
Authors: AL-RAWAF A. S.
Published: September 2003

We suggest a law for the decay of the effective cosmological constant of the form [Formula: see text]. It is shown that this provides more room for consistency with the recent observational data on Hubble's constant and the age of the universe.
A POSITIVE TEST FOR FERMI–DIRAC DISTRIBUTIONS OF QUARK–PARTONS
Authors: BUCCELLA FRANCO , PISANTI OFELIA , ROSA LUIGI , DORSNER ILYA , SANTORELLI PIETRO
Published: September 2003

By describing a large class of deep inelastic processes with standard parametrization for the different parton species, we check the characteristic relationship dictated by Pauli principle: broader shapes for higher first moments. Indeed, the ratios between the second and the first moments and the one between the third and the second moments for the valence partons is an increasing function of the first moment and agrees quantitatively with the values found with Fermi–Dirac distributions.
HIGGS FIELD AS THE GAUGE FIELD CORRESPONDING TO PARITY IN THE USUAL SPACE–TIME
Authors: ERDEM RECAI
Published: September 2003

We find that the local character of field theory requires the parity degree of freedom of the fields to be considered as an additional discrete fifth dimension which is an artifact emerging due to the local description of space–time. Higgs field can be interpreted as the gauge field corresponding to this discrete dimension. Hence the noncommutative geometric derivation of the standard model follows as a manifestation of the local description of the usual space–time.
GRAVITY FROM DIRAC EIGENVALUES
Authors: LANDI GIOVANNI , ROVELLI CARLO
Published: September 2003

We study a formulation of Euclidean general relativity in which the dynamical variables are given by a sequence of real numbers λn, representing the eigenvalues of the Dirac operator on the curved space–time. These quantities are diffeomorphism-invariant functions of the metric and they form an infinite set of "physical observables" for general relativity. Recent work of Connes and Chamseddine suggests that they can be taken as natural variables for an invariant description of the dynamics of gravity. We compute the Poisson brackets of the λn's, and find that these can be expressed in terms of the propagator of the linearized Einstein equations and the energy-momentum of the eigenspinors. We show that the eigenspinors' energy-momentum is the Jacobian matrix of the change of coordinates from the metric to the λn's. We study a variant of the Connes–Chamseddine spectral action which eliminates a disturbing large cosmological term. We analyze the corresponding equations of motion and find that these are solved if the energy momenta of the eigenspinors scale linearly with the mass. Surprisingly, this scaling law codes Einstein's equations. Finally we study the coupling to a physical fermion field.
CHIRAL ASYMMETRY AND GRAVITATION THOERY
Authors: MARQUES G. C. , SPEHLER D.
Published: September 2003

In this letter we apply an alternative approach, recently developed, to the description of massless particles of arbitrary spin to the case of spin-two particles. This provides a non-geometrical approach to the theory of linearized gravitation. Within this method the chiral components of a spinor field are treated as independent field variables. The free field Lagrangian is built up from the requirement of chiral invariance. This formulation is parallel to the neutrino theory and leads to a formulation that generalizes, to particles of spin-two, the two-component neutrino theory. At the free field level the analog of curvature tensor, spin connection tensor, and metric tensor are independent quantities. By introducing left–right asymmetric linear interactions of these chiral components we get the linearized gravitation theory.
SQUEEZED STATES FOR PARABOSONS
Authors: BAGCHI B. , BHAUMIK D.
Published: September 2003

Squeezed states for parabosons are constructed since we know that a parabose oscillator can be parametrized in terms of bosonic operators. We also discuss some of their important properties.
SYMMETRIES AND DEGREES OF FREEDOM IN TWO-DIMENSIONAL DUAL MODELS
Authors: CONSTANTINIDIS C. P. , DEVECCHI F. P.
Published: September 2003

The two-dimensional version of the Schwarz and Sen duality model (Tseytlin model) is analyzed at the classical and quantum levels. The solutions are obtained after removing the gauge-dependent sector using the Dirac method. The Poincaré invariance is verified at both levels. An extension with global supersymmetry is also proposed.
GAUGINO DETERMINANT IN SUPERSYMMETRIC YANG–MILLS THEORY
Authors: HSU STEPHEN D. H.
Published: September 2003

We resolve an ambiguity in the sign of the determinant of a single Weyl fermion, such as the gaugino in supersymmetric models. Positivity of this determinant is necessary for the application of QCD inequalities and lattice Monte–Carlo methods to supersymmetric Yang–Mills models.
THE FERMION MASSES IN E6
Authors: AKCAY H.
Published: September 2003

We investigate a particular breaking chain of the grand unification group E6. With two smallest Higgs multiplets that have Yukawa couplings to fermions, we obtain a reasonable mass spectrum for fermions. The neutrino masses are expressed in terms of the masses of the charged fermions, leading to a predictive neutrino spectrum.
ON THE REMOTE SENSING OF HAWKING GREY PULSES
Authors: ROSU HARET C.
Published: September 2003

This is a short note on the black hole remote-sensing problem, i.e. finding out "surface" temperature distributions of various types of small (micron-sized) black holes from the spectral measurements of their Hawking grey pulses. Chen's modified Möbius inverse transform is illustrated in this context.
JACK POLYNOMIALS, GENERALIZED BINOMIAL COEFFICIENTS AND POLYNOMIAL SOLUTIONS OF THE GENERALIZED LAPLACE'S EQUATION
Authors: CHATURVEDI S.
Published: September 2003

We discuss the symmetric homogeneous polynomial solutions of the generalized Laplace's equation which arises in the context of the Calogero–Sutherland model on a line. The solutions are expressed as linear combinations of Jack polynomials and the constraints on the coefficients of expansion are derived. These constraints involve generalized binomial coefficients defined through Jack polynomials. Generalized binomial coefficients for partitions of k up to k=6 are tabulated.
SPONTANEOUS CP-VIOLATION AND STABILITY OF THE HIGGS POTENTIAL IN MSSM
Authors: LEBEDEV OLEG
Published: September 2003

We study the stability properties of the one-loop corrected Higgs potential in MSSM. For the gaugino–higgsino dominated case, the assumptions allowing spontaneous CP-violation lead to the potential which has neither global nor local minima. The incorporation of a scalar SUSY soft-breaking mass can rectify this problem.
FOURTH-ORDER TOPOLOGICAL TENSOR CURRENT AND FOCK'S COORDINATE CONDITION
Authors: YANG GUOHONG , DUAN YISHI
Published: September 2003

From ϕ-mapping method we construct a fouth-order topological tensor current in general. It is shown that the inner structure of this topological tensor current is labelled by the δ-function δ(ϕ), which represents some four-dimensional singular manifolds. By investigating the total expansion of δ(ϕ), these singular manifolds carry the topological numbers βiηi naturally, which does not involve any concrete models. As the generalization of Nielsen's Lagrangian and Nambu's action for strings, we present a new coordinate condition in general relativity, which includes the Fock's coordinate condition as a special case.
YUKAWA INTERACTION FROM A SUPERSYMMETRIC COMPOSITE MODEL
Authors: HABA N. , OKAMURA N.
Published: September 2003

We present a composite model that is based on nonperturbative effects of N=1 supersymmetric SU (NC) gauge theory with Nf=NC+1 flavors. In this letter, we consider NC=7, where all fields of one generation (quarks, leptons and Higgs) are bound states of preons and anti-preons. When SU (7)H coupling becomes strong. Yukawa couplings of quarks and leptons are generated dynamically. We show the one-generation model first and then we try to extend it to the three-generation model.
GENERALIZED QUANTUM CONDITIONS AND COHERENT STATES
Authors: BAGCHI B. , BHAUMIK D.
Published: September 2003

We consider possible modifications of the Calogero–Vasiliev quantum condition and address the problem of construction of coherent states.
GRAVITY GENERATION OF ELECTROMAGNETIC RADIATION AND THE LUMINOSITY OF QUASARS
Authors: KRAFT DAVID W. , MOTZ LLOYD
Published: September 2003

A mechanism is proposed for the emission of radiation by charged particles in the gravitational field of a quasar whereby the gravitational field is coupled directly to the radiation field of the charge via the principle of equivalence. A generalized Larmor formula for the radiation emitted by a charge at rest in a gravitational field can account for the total radiant energy and spectral distribution emitted by quasars. This gravitational mechanism for the emission of electromagnetic radiation becomes more important than any other mechanism when the radius of the quasar is near its Schwarzschild radius.
MATRIX σ-MODELS FOR MULTI D-BRANE DYNAMICS
Authors: LIZZI FEDELE , MAVROMATOS NICK E. , SZABO RICHARD J.
Published: September 2003

We describe a dynamical worldsheet origin for the Lagrangian describing the low-energy dynamics of a system of parallel D-branes. We show how matrix-valued collective coordinate fields for the D-branes naturally arise as couplings of a worldsheet σ-model, and that the quantum dynamics require that these couplings be mutually noncommutative. We show that the low-energy effective action for the σ-model couplings describes the propagation of an open string in the background of the multiple D-brane configuration, in which all string interactions between the constituent branes are integrated out and the genus expansion is taken into account, with a matrix-valued coupling. The effective field theory is governed by the non-Abelian Born–Infeld target space action which leads to the standard one for D-brane field theory.
ON THE EQUIVALENCE BETWEEN 2-D INDUCED GRAVITY AND A WZNW SYSTEM
Authors: BLAGOJEVĆ M. , POPOVIĆ D. S. , SAZDOVIĆ B.
Published: September 2003

A general method of constructing canonical gauge-invariant actions is used to establish the equivalence between 2-D induced gravity and a WZNW system, defined by a difference of two simple WZNW actions for the SL (2, R) group. The diffeomorphism invariance of the induced gravity is generated by the SL (2, R) Kac–Moody structure of the WZNW system.
INTERACTION OF F- andD-STRINGS IN THE MATRIX MODEL
Authors: DASS N. D. HARI , SATHIAPALAN B.
Published: September 2003

We study a configuration of a parallel F- (fundamental) and D-string in IIB string theory by considering its T-dual configuration in the matrix model description of M-theory. We show that certain nonperturbative features of string theory such as O(e-1/gs) effects due to soliton loops, the existence of bound state (1,1) strings and manifest S-duality, can be seen in matrix models. We discuss certain subtleties that arise in the large-N limit when membranes are wrapped around compact dimensions.
INFLATIONARY COSMOLOGICAL SOLUTIONS IN WEYL INTEGRABLE GEOMETRY
Authors: FABRIS J. C. , SALIM J. M. , SAUTU S. L.
Published: September 2003

We consider a homogeneous and isotropic cosmological model in Weyl integrable space–time. A general non-singular solution is obtained which is consistent with the inflationary scenario.
ON THE MIURA AND BÄCKLUND TRANSFORMATIONS ASSOCIATED WITH THE SUPERSYMMETRIC GELFAND–DICKEY BRACKET
Authors: SHAW JIIN-CHANG , TU MING-HSIEN
Published: September 2003

The supersymmetric version of the Miura and Bäcklund transformations associated with the supersymmetric Gelfand–Dickey bracket are investigated from the point of view of the Kupershmidt–Wilson theorem.
NOVEL PHENOMENA IN CHARGED BOSE LIQUID
Authors: LEE KIMYEONG , TCHERNYSHYOV OLEG
Published: September 2003

We investigate charged Bose liquid immersed in uniform background charge at zero temperature. Novel phenomena, such as oscillatory shielding of external localized electric charge, rotons and charge density waves (charge stripes in two dimensions), occur in any dimensions. Oscillatory shielding is caused by mixing between scalar boson exchange and Coulomb interactions, which mediate opposite forces. On the other hand, rotons and charge density waves are due to attractive local self-interaction of bosons. Rotons can be regarded as a finite size charge density wave packet without any back flow. We also comment on charge stripes observed recently in cuprates and nickelates.
ON PARASTATISTICS DEFINED AS TRIPLE OPERATOR ALGEBRAS
Authors: MELJANAC STJEPAN , STOJIĆ MARKO , MILEKOVIĆ MARIJAN
Published: September 2003

Parastatistics, defined as triple operator algebras represented on Fock space, are unified in a simple way using the transition number operators. They are expressed as a normal ordered expansion of creation and annihilation operators. We discuss several examples of parastatistics, particularly Okubo's and Palev's parastatistics connected to many-body Wigner quantum systems and relate them to the notion of extended Haldane statistics.
ON THE SUPERSTRING AXION MINI-STAR
Authors: POLLOCK M. D.
Published: September 2003

The theory of the pressure-free-boson mini-star of mass M, whose radius r=2GM/v2 is equated via the indeterminacy principle to ℏ/mv, where [Formula: see text] is the Newton gravitational constant, M P being the Planck mass and m the mass of the boson, travelling at velocity v, is applied to the superstring axion. For a bounded object, the upper limit to the axion potential [Formula: see text] constrains the axions to move at non-relativistic velocities [Formula: see text] where [Formula: see text] GeV is the axion decay constant, predicting the existence of an axion mini-star of mass [Formula: see text]. Such objects can in principle form by gravitational collapse below the temperature T≈100 eV, and are tentatively identified with the microlensing objects recently detected in our Galaxy and in the direction of the Large Magellanic Cloud.
MIRROR SYMMETRY AS A POISSON-LIE T-DUALITY
Authors: PARKHOMENKO S. E.
Published: September 2003

The transformation properties of the N = 2 Virasoro superalgebra generators under Poisson–Lie T-duality in (2,2)-superconformal WZNW and Kazama–Suzuki models is considered. It is shown that Poisson–Lie T-duality on the N=2 super-Virasoro algebra generators acts as a mirror symmetry: it unchanges the generators from one of the chirality sectors while in another chirality sector it changes the sign of U(1) current and interchanges spin-3/2 currents. We discuss Kazama–Suzuki models generalization of this transformation and show that Poisson–Lie T-duality again acts as a mirror symmetry.
QCD IN THE INFRARED WITH EXACT ANGULAR INTEGRATIONS
Authors: ATKINSON D. , BLOCH J. C. R.
Published: September 2003

In a previous paper we have shown that in quantum chromodynamics the gluon propagator vanishes in the infrared limit, while the ghost propagator is more singular than a simple pole. These results were obtained after angular averaging, but here we go beyond this approximation and perform an exact calculation of the angular integrals. The powers of the infrared behavior of the propagators are changed substantially. We find the very intriguing result that the gluon propagator vanishes in the infrared exactly like p2, whilst the ghost propagator is exactly as singular as 1/p4. We also find that the value of the infrared fixed point of the QCD coupling is much decreased: it is now equal to 4π/3.
CENTRAL CHARGE AS THE ORIGIN OF HOLOMORPHIC EFFECTIVE ACTION IN N = 2 GAUGE THEORY
Authors: BUCHBINDER E. I. , IVANOV E. A. , BUCHBINDER I. L. , KUZENKO S. M.
Published: September 2003

We show explicitly that the perturbative holomorphic contribution to the off-shell effective action of N=2 U(1) gauge supermultiplet is an entire effect of the minimal coupling to a hypermultiplet with the mass generated by a central charge in N = 2 superalgebra. The central charge is induced by a constant vacuum N = 2 gauge superfield strength spontaneously breaking the automorphism U (1)R symmetry of N = 2 superalgebra. We use the manifestly off-shell supersymmetric harmonic superspace techniques of quantum calculations with the central charge-massive hypermultiplet propagator.
WORMHOLES IN SPACE–TIME WITH TORSION
Authors: ANCHORDOQUI LUIS A.
Published: September 2003

Analytical wormholes solutions in U 4 theory are presented. It is discussed whether the extremely short range repulsive forces, related to the spin angular momentum of matter, could be the "carrier" of the exoticity that threads the wormhole throat.
ON THE UNIQUENESS OF STATIONARY AXISYMMETRIC ELLIPSOIDAL VACUUM CONFIGURATIONS
Authors: RÁCZ ISTVÁN , SÜVEGES MÁRIA
Published: September 2003

Stationary axisymmetric vacuum space–times in general relativity are considered. The Riemannian metric induced on the space of the time-like Killing trajectories is assumed to be ellipsoidal. It is demonstrated that the only ellipsoidal solutions of the vacuum Einstein's equations are the Kerr–NUT family with vanishing electric and magnetic charges.
PHASE TRANSITION INDUCED BY A MAGNETIC FIELD
Authors: SEMENOFF G. W. , SHOVKOVY I. A. , WIJEWARDHANA L. C. R.
Published: September 2003

The magnetic catalysis of discrete chiral symmetry breaking in the (2+1)-dimensional Nambu–Jona-Lasinio model is analyzed. Particular attention is paid to a possible application of the effect in solid state physics. The fermion contribution to the thermal conductivity as a function of the dynamical mass (energy gap in the spectrum) is estimated and is shown to be suppressed when a nonzero order parameter develops.
ON CASIMIR OPERATOR OF PUSZ–WORONOWICZ'S ${\rm gl}_{\sqrt{q}}(n)$-COVARIANT OSCILLATOR ALGEBRA
Authors: CHUNG W.-S.
Published: September 2003

The Casimir operator of Pusz–Woronowicz's [Formula: see text]-covariant oscillator algebra is obtained and its representation theory is discussed.
THE sAKNS HIERARCHY
Authors: ARATYN HENRIK , DAS ASHOK
Published: September 2003

We study, systematically, the properties of the supersymmetric AKNS (sAKNS) hierarchy. In particular, we discuss the Lax representation in terms of a bosonic Lax operator and some special features of the equations and construct the bosonic local charges as well as the fermionic nonlocal charges associated with the system starting from the Lax operator. We obtain the Hamiltonian structures of the system and check the Jacobi identity through the method of prolongation. We also show that this hierarchy of equations can equivalently be described in terms of a fermionic Lax operator. We obtain the zero curvature formulation as well as the conserved charges of the system starting from this fermionic Lax operator which suggests a connection between the two. Finally, starting from the fermionic description of the system, we construct the soliton solutions for this system of equations through Darboux–Bäcklund transformations and describe some open problems.
QUANTIZATION OF SPONTANEOUSLY BROKEN GAUGE THEORY BASED ON THE BFT–BFV FORMALISM
Authors: KIM YONG-WAN , PARK YOUNG-JAI
Published: September 2003

We quantize the spontaneously broken Abelian U(1) Higgs model by using the improved BFT and BFV formalisms. We construct the BFT physical fields and obtain the firstclass observables including the Hamiltonian in terms of these fields. We also explicitly show that there are exact form invariances between the second-class and first-class quantities. Then, according to the BFV formalism, we derive the corresponding Lagrangian having U(1) gauge symmetry. We also discuss at the classical level how one easily gets the first-class Lagrangian from the symmetry-broken second-class Lagrangian.
LIGHT-FRONT QUANTIZED SCHWINGER MODEL AND θ-VACUA
Authors: SRIVASTAVA PREM P.
Published: September 2003

The light-front (LF) quantization of the bosonized Schwinger model is discussed. The proposal, successfully used earlier for describing the spontaneous symmetry breaking (SSB) on the LF, of separating first the scalar field into the dynamical condensate and the fluctuation fields before employing the standard Dirac method works here as well. The condensate variable is now shown to be a q-number operator in contrast to the case of SSB where it was shown to be a c-number. The condensate or θ-vacua emerge straightforwardly along with their continuum normalization which avoids the violation of the cluster decomposition property. Attention is drawn to the fact that the theory quantized, say, at equal x+, carries in it at the same time information on equal x- commutators as well.
THERMAL RESTORATION OF CHIRAL SYMMETRY IN SUPERSYMMETRIC NAMBU–JONA-LASINIO MODEL WITH SOFT SUSY BREAKING
Authors: HASHIDA J. , MUTA T. , OHKURA K.
Published: September 2003

The supersymmetric version of the Nambu–Jona-Lasinio model is investigated in connection with the chiral symmetry breaking induced by a soft SUSY breaking term. It is found that the broken chiral symmetry due to the soft breaking term is restored at suitably high temperature and the symmetry restoration occurs as first-order phase transitions. The critical temperature at which the chiral symmetry is restored is determined as a function of the strength of the soft breaking term and the field coupling constant. The dynamical fermion mass is calculated at finite temperature. Some possible applications to the breaking scenario of unified field theories are discussed.
STRANGE MATTER STARS AND GENERAL RELATIVITY
Authors: CERVILLERA LUIS P. NEIRA , AQUILANO ROBERTO O. , VUCETICH HECTOR
Published: September 2003

In this letter we present a general relativistic star with strange matter to explain in a young supernova remnant the radial millisecond oscillations. The results confirm previous conclusions.
A MODEL OF NONLOCAL QUANTUM ELECTRODYNAMICS; TIME'S ARROW AND EPR-LIKE QUANTUM CORRELATION
Authors: RAI DASTIDAR T. K. , RAI DASTIDAR KRISHNA
Published: September 2003

A recent experiment with squeezed light has shown that two-photon absorption by an atom can occur with a linear intensity dependence. We point out that this result verifies a prediction made by us a decade ago from an analysis of a nonlocal model of quantum electrodynamics. This model had earlier been proposed by us in an ad hoc manner to interpret certain features of multiphoton double ionization and above-threshold ionization in an atom placed in a strong laser field; in this letter we show that the model can be obtained field-theoretically by demanding covariance of the field Lagrangian under a nonlocal U(1) gauge transformation. We also show that the model makes direct contact with squeezed light, and thus allows us to describe these two completely different scenarios from a unified point of view. We obtain a fundamentally new result from our nonlocal model of QED, namely that only the past, but not the future, can influence the present — thus establishing a non-thermodynamic arrow of time. We also show that correlations within a quantum system should necessarily be of the EPR-type, a result that agrees with Bell's theorem. These results follow from the simple requirement of energy conservation in matter-radiation interaction. Furthermore, we also predict new and experimentally verifiable results on the basis of our model QED.
MASSIVE FIELDS AND THE 2-D STRING
Authors: WILKINS ANDY
Published: September 2003

The first massive level of closed bosonic string theory is studied. Free-field equations are derived by imposing Weyl invariance on the worldsheet. A two-parameter solution to the equation of motion and constraints is found in two dimensions with a flat linear-dilaton background. One-to-one tachyon scattering is studied in this background. The results support Dhar, Mandal and Wadia's proposal that 2-D critical string theory corresponds to the c = 1 matrix model in which both sides of the Fermi sea are excited.