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Low RF power plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavitiesFeb 08 2019Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance limiting factors to overcome and plasma cleaning has been proven successful ... More

Vacuum energy sequestering and cosmic dynamicsOct 16 2014We explicitly compute the dynamics of closed homogeneous and isotropic universes permeated by a single perfect fluid with a constant equation of state parameter $w$ in the context of a recent reformulation of general relativity, proposed in [1], which ... More

On the cosmological evolution of alpha and mu and the dynamics of dark energyApr 22 2008We study the cosmological evolution of the fine structure constant, $\alpha$, and the proton-to-electron mass ratio, $\mu=m_p/m_e$, in the context of a generic class of models where the gauge kinetic function is a linear function of a quintessence-type ... More

Interacting dark energy: the role of microscopic feedback in the dark sectorFeb 09 2015Mar 10 2015We investigate the impact on the classical dynamics of dark matter particles and dark energy of a non-minimal coupling in the dark sector, assuming that the mass of the dark matter particles is coupled to a dark energy scalar field. We show that standard ... More

In medium T matrix for neutron matterApr 03 2002Jun 18 2002We calculate the equation of state of pure neutron matter, comparing the G-matrix calculation with the in-medium T-matrix result. At low densities, we obtain similar energies per nucleon, however some differences appear at higher densities. We use the ... More

Energy dependence of transverse quark flow in heavy ion collisionsJul 19 2004Energy dependence of quark transverse flow carries information about dynamical properties (equation of state, initial conditions) of deconfined matter produced in heavy ion collisions. We assume quark-antiquark matter formation in Pb+Pb collisions at ... More

D and J/psi production from deconfined matter in relativistic heavy ion collisionsAug 18 2000We study the production of the D and J/psi mesons from deconfined quark matter at CERN SPS energy. Using the MICOR microscopical coalescence model we determine the transverse momentum spectra of these charm mesons. We predict the slopes of their transverse ... More

Molecular Dipolar Crystals as High Fidelity Quantum Memory for Hybrid Quantum ComputingJun 20 2007We study collective excitations of rotational and spin states of an ensemble of polar molecules, which are prepared in a dipolar crystalline phase, as a candidate for a high fidelity quantum memory. While dipolar crystals are formed in the high density ... More

Interlayer Exchange Coupling in (Ga,Mn)As-based SuperlatticesFeb 14 2005The interlayer coupling between (Ga,Mn)As ferromagnetic layers in all-semiconductor superlattices is studied theoretically within a tight-binding model, which takes into account the crystal, band and magnetic structure of the constituent superlattice ... More

Non-Perturbative Superpotentials in F-theory and String DualityApr 07 2005May 12 2005We use open-closed string duality between F-theory on K3xK3 and type II strings on CY manifolds without branes to study non-perturbative superpotentials in generalized flux compactifications. On the F-theory side we obtain the full flux potential including ... More

Successive Injection of Opposite Magnetic Helicity in Solar Active Region NOAA 11928Nov 02 2016Understanding the nature and evolution of the photospheric helicity flux transfer is a key to reveal the role of magnetic helicity in coronal dynamics of solar active regions. Using SDO/HMI photospheric vector magnetograms and the derived flow velocity ... More

Single- and Two-Component GRB Spectra in the Fermi GBM-LAT Energy RangeFeb 13 2012Jun 04 2012Most Fermi GRB spectra appear as either a broken power law extending to GeV energies or as a broken power with a separate GeV power law component. Here we show that such spectra can be understood in terms of magnetically dominated relativistic jets where ... More

Impact of nuclear effects on the extraction of neutrino oscillation parametersJul 04 2013Dec 03 2013We study the possible impact of nuclear effects and final state interactions on the determination of the oscillation parameters due to mis-reconstruction of non-quasi-elastic events as quasi-elastic events at low energies. We analyze a $\nu_\mu$ disappearance ... More

Constraining the physics of the early UniverseMar 26 2019The established cosmological theory which describes the history of the Universe since shortly after the "Big Bang" until today is remarkably successful. Thanks to the increasing precision of available observational data, we are now able to considerably ... More

Multiple partitions, lattice paths and a Burge-Bressoud-type correspondenceAug 31 2006Jan 15 2008A bijection is presented between (1): partitions with conditions $f_j+f_{j+1}\leq k-1$ and $ f_1\leq i-1$, where $f_j$ is the frequency of the part $j$ in the partition, and (2): sets of $k-1$ ordered partitions $(n^{(1)}, n^{(2)}, ..., n^{(k-1)})$ such ... More

Classes of Exact Solutions to Regge-Wheeler and Teukolsky EquationsFeb 08 2009Mar 17 2009The Regge-Wheeler equation describes axial perturbations of Schwarzschild metric in linear approximation. Teukolsky Master Equation describes perturbations of Kerr metric in the same approximation. We present here unified description of all classes of ... More

On the Action Principle in Affine Flat Spaces with TorsionNov 30 1997To comply with the equivalence principle in Einstein-Cartan-like theories of gravity we propose a modification of the action principle in affine flat spaces with torsion.

Exact Solutions of Regge-Wheeler Equation and Quasi-Normal Modes of Compact ObjectsSep 30 2005Mar 16 2006The well-known Regge-Wheeler equation describes the axial perturbations of Schwarzschild metric in the linear approximation. From a mathematical point of view it presents a particular case of the confluent Heun equation and can be solved exactly, due ... More

On the Solutions of Einstein Equations with Massive Point SourceJul 23 2004Dec 30 2004We show that Einstein equations are compatible with the presence of massive point particles and find corresponding two parameter family of their solutions which depends on the bare mechanical mass $M_0>0$ and the Keplerian mass $M<M_0$ of the point source ... More

Towards Multiple-Star Population SynthesisAug 25 2009The multiplicities of stars, and some other properties, were collected recently by Eggleton & Tokovinin, for the set of 4559 stars with Hipparcos magnitude brighter than 6.0 (4558 excluding the Sun). In this paper I give a numerical recipe for constructing, ... More

The limiting behavior of the Liu-Yau quasi-local energyJun 07 2007The small- and large-sphere limits of the quasi-local energy recently proposed by Liu and Yau are carefully examined. It is shown that in the small-sphere limit, the non-vacuum limit of the Liu-Yau quasi-local energy approaches the expected value \frac{4\pi}{3} ... More

Charge multiplets and masses for E(11)May 28 2008Oct 30 2008The particle, string and membrane charge multiplets are derived in detail from the decomposition of the l1 (charge) representation of E(11) in three, four, five, six, seven and eight spacetime dimensions. A tension formula relating weights of the l1 (charge) ... More

Eddington-inspired Born-Infeld gravity: astrophysical and cosmological constraintsJan 12 2012In this letter we compute stringent astrophysical and cosmological constraints on a recently proposed Eddington-inspired Born-Infeld theory of gravity. We find, using a generalized version of the Zel'dovich approximation, that in this theory a pressureless ... More

Lorentz-Invariant Interpretation of Noncommutative Space-Time - global versionAug 12 2004Aug 24 2004The global version of the quantum symmetry defined by Chaichian et al (hep-th/0408069) is constructed.

Stability of vector bundles from F-theoryApr 15 1999We use a recently proposed formulation of stable holomorphic vector bundles $V$ on elliptically fibered Calabi--Yau n-fold $Z_n$ in terms of toric geometry to describe stability conditions on $V$. Using the toric map $f: W_{n+1} \to (V,Z_n)$ that identifies ... More

On the geometry of the characteristic class of a star product on a symplectic manifoldDec 28 2001The characteristic class of a star product on a symplectic manifold appears as the class of a deformation of a given symplectic connection, as described by Fedosov. In contrast, one usually thinks of the characteristic class of a star product as the class ... More

Prospects for GeV-TeV detection of short gamma-ray bursts with extended emissionDec 02 2013Apr 21 2014We discuss the GeV to TeV photon emission of gamma-ray bursts (GRBs) within the refreshed shock and the continuous injection scenarios, motivated by the observation of extended emission in a substantial fraction of short GRBs. In the first model we assume ... More

H_αLuminosity and Star Formation of Galaxies in HCGsApr 07 1999We have obtained $H_{\alpha}$ fluxes and luminosities for a sample of 95 accordant galaxies from observations of 31 Hickson Compact Groups (HCGs) in the North hemisphere. This sample is the largest $H_{\alpha}$ selected catalogue of galaxies having $H_{\alpha}$ ... More

The study on penetration depth of anisotropic two-band s-wave superconductors by Ginzburg-Landau approachMar 29 2019The penetration depth of anisotropic two-band s-wave superconductors have been studied by Ginzburg-Landau approach. The anisotropic spherical Fermi surfaces and order parameters with the spherical ellipse or pancake Fermi shape are used for derive penetration ... More

Unified approach to growth and aging in biological, technical and biotechnical systemsJul 16 2012Complex systems, in many different scientific sectors, show coarse-grain properties with simple growth laws with respect to fundamental microscopic algorithms. We propose a classification scheme of growth laws which includes human aging, tumor (and/or ... More

Novel Geometrical Models of Relativistic Stars III. The Point Particle IdealizationSep 27 2004We describe a novel class of geometrical models of relativistic stars. Our approach to the static spherically symmetric solutions of Einstein equations is based on a careful physical analysis of radial gauge conditions. It brings us to a two parameter ... More

Novel Geometrical Models of Relativistic Stars. I. The General SchemeSep 19 2004In a series of articles we describe a novel class of geometrical models of relativistic stars. Our approach to the static spherically symmetric solutions of Einstein equations is based on a careful physical analysis of radial gauge conditions. It brings ... More

Nonlocal operator basis from the path representation of the M(k+1,k+2) and the M(k+1,2k+3) minimal modelsFeb 28 2008Aug 12 2008We reinterpret a path describing a state in an irreducible module of the unitary minimal model M(k+1,k+2) in terms of a string of charged operators acting on the module's ground-state path. Each such operator acts non-locally on a path. The path characteristics ... More

Paths for Z_k parafermionic modelsMar 01 2007Jul 03 2007We present a simple bijection between restricted (Bressoud) lattice paths and RSOS paths in regime II. Both types of paths describe states in Z_k parafermionic irreducible modules. The bijection implies a direct correspondence between a RSOS path and ... More

Embedding of bases: from the M(2,2k+1) to the M(3,4k+2-delta) modelsNov 03 2005Nov 09 2005A new quasi-particle basis of states is presented for all the irreducible modules of the M(3,p) models. It is formulated in terms of a combination of Virasoro modes and the modes of the field phi_{2,1}. This leads to a fermionic expression for particular ... More

Single-channel correlators and residue calculusMay 31 2001Aug 04 2001Some simple (namely, single-channel) correlation functions involving an arbitrary number of fields are computed by means of a direct application of the residue calculus, through partial fraction expansions. Examples are presented in minimal models and ... More

Anisotropy-driven transition from collisionless to collisional regime in the dipolar modes of a trapped gaseous mixtureAug 30 2004Jan 27 2005We evaluate the dipolar oscillations of a harmonically trapped fermion gas containing thermal bosonic impurities as a function of the anisotropy of the trap, from the numerical solution of the Vlasov-Landau equations for the one-body phase-space distribution ... More

Big-bang nucleosynthesis and cosmic microwave background constraints on non-minimally coupled theories of gravityJul 02 2018In this paper we show that the baryon-to-photon ratio $\eta$ is in general not conserved before decoupling in non-minimally coupled theories of gravity. We use big-bang nucleosynthesis and cosmic microwave background limits on the baryon-to-photon ratio ... More

M-Theory Solutions in Multiple Signatures from E_11Jun 15 2005Oct 28 2005We generalise the previously given E_11 half BPS solution generating group element to general weights of A_10. We find that it leads to solutions of M-theory but in signatures (1,10), (2,9), (5,6), (6,5), (9,2) and (10,1). The signature transformations ... More

$π$-$K$ scattering lengths at finite temperature in the Nambu--Jona-Lasinio modelApr 14 1998The transition amplitude for $\pi K$ scattering is evaluated within the SU(3) Nambu--Jona-Lasinio model. Ordering terms according to the expansion in $1/N_c$ leads to a box-like diagram, $t$ channel diagrams that admit scalar isoscalar $(\sigma,\sigma')$ ... More

Second law of thermodynamics in nonminimally coupled gravityAug 07 2019In the present work we show that the second law of thermodynamics does not generally hold if the matter and gravitational fields are nonminimally coupled. We demonstrate this result by explicitly computing the evolution of the entropy of the matter fields ... More

Fourier Disentangling Using the Technology of Virtual ObservatoryMar 25 2010The Virtual Observatory is a new technology of the astronomical research allowing the seamless processing and analysis of a heterogeneous data obtained from a number of distributed data archives. It may also provide astronomical community with powerful ... More

Heterotic String/F-theory Duality from Mirror SymmetryNov 25 1998Apr 15 1999We use local mirror symmetry in type IIA string compactifications on Calabi-Yau n+1 folds $X_{n+1}$ to construct vector bundles on (possibly singular) elliptically fibered Calabi-Yau n-folds Z_n. The interpretation of these data as valid classical solutions ... More

QCD Equation of State and Hadron Resonance GasDec 13 2009May 03 2010We compare the trace anomaly, strangeness and baryon number fluctuations calculated in lattice QCD with expectations based on hadron resonance gas model. We find that there is a significant discrepancy between the hadron resonance gas and the lattice ... More

Faraday waves in elongated superfluid fermionic cloudsAug 19 2008Sep 29 2008We use hydrodynamic equations to study the formation of Faraday waves in a superfluid Fermi gas at zero temperature confined in a strongly elongated cigar-shaped trap. First, we treat the role of the radial density profile in the limit of an infinite ... More

Avoiding unrealistic priors: the case of dark energy constraints from the time variation of the fine-structure constantFeb 14 2016We critically assess recent claims suggesting that upper limits on the time variation of the fine-structure constant tightly constrain the coupling of a dark energy scalar field to the electromagnetic sector, and, indirectly, the violation of the weak ... More

Dependence of the Form Factors of $B \to π\ell ν$ on the Heavy Quark MassDec 10 1993We use QCD sum rules to analyze the semileptonic transition $B \to \pi \ell \nu$ in the limit $m_b \to \infty$. We derive the dependence of the form factor $F_1(0)$ on the heavy quark mass, which is compatible with the expected dependence for the simple ... More

Optical Nuclei of Radio-loud AGN and the Fanaroff-Riley DivideJan 06 2004Aug 16 2004We investigate the nature of the point-like optical ``cores'' that have been found in the centres of the host galaxies of a majority of radio galaxies by the Hubble Space Telescope. We examine the evidence that these optical cores are relativistically ... More

A simplified view of blazars: the very high energy gamma-ray visionOct 02 2014We have recently proposed a simplified scenario for blazars in which these sources are classified as flat-spectrum radio quasars or BL Lacs according to the prescriptions of unified schemes, and to a varying combination of Doppler boosted radiation from ... More

Proton-proton correlation function for the pp -> pp + eta and pp -> pp + pions reactionsAug 30 2010For the very first time, the correlation femtoscopy method is applied to a kinematically complete measurement of meson production in the collisions of hadrons. The shape of the two-proton correlation function derived for the pp -> ppeta reaction differs ... More

Pion $p_T$ spectra in $p+p$ collisions as a function of $\sqrt{s}$ and event multiplicityAug 05 2014Sep 03 2014We study the charged pion transverse momentum ($p_T$) spectra in $p$+$p$ collisions as a function of collision energy $\sqrt{s}$ and event multiplicity using Tsallis distribution. This study gives an insight of the pion production process in $p+p$ collisions. ... More

Static Fundamental Solutions of Einstein Equations and Superposition Principle in Relativistic GravityvJan 19 2007We show that Einstein equations are compatible with the presence of massive point particle idealization and find the corresponding two parameter family of solutions. They are complete defined by the bare mechanical mass $M>0$ and the Keplerian mass $m>0$ ... More

Applications of Lobachevsky Geometry to the Relativistic Two-Body ProblemMay 25 2004In this talk we consider the geometrical basis for the reduction of the relativistic 2-body problem, much like the non-relativistic one, to describing the motion of an effective particle in an external field. It is shown that this possibility is deeply ... More

Spinless Matter in Transposed-Equi-Affine Theory of GravityDec 01 1997May 16 1998We derive and discus the equations of motion for spinless matter: relativistic spinless scalar fields, particles and fluids in the recently proposed by A. Saa model of gravity with covariantly constant volume with respect to the transposed connection ... More

Parafermionic quasi-particle basis and fermionic-type charactersAug 09 2001Oct 23 2001A new basis of states for highest-weight modules in $\ZZ_k$ parafermionic conformal theories is displayed. It is formulated in terms of an effective exclusion principle constraining strings of $k$ fundamental parafermionic modes. The states of a module ... More

The Z_k^(su(2),3/2) ParafermionsJun 23 2005Sep 19 2005We introduce a novel parafermionic theory for which the conformal dimension of the basic parafermion is 3(1-1/k)/2, with k even. The structure constants and the central charges are obtained from mode-type associativity calculations. The spectrum of the ... More

Galactic PhylogeneticsSep 27 2017Phylogenetics is a widely used concept in evolutionary biology. It is the reconstruction of evolutionary history by building trees that represent branching patterns and sequences. These trees represent shared history, and it is our intention for this ... More

Wave packets in the Schwartz space of a reductive p-adic symmetric spaceMar 05 2012May 15 2013We form wave packets in the Schwartz space of a reductive p-adic symmetric space for certain famillies of tempered functions. We show how to construct such families from Eisenstein integrals.

Spherical character of a supercuspidal representation as weighted orbital integralSep 22 2016Let $\rm E/\rm F$ be an unramified quadratic extension of local non archimedean fields of characteristic 0. Let $\underline{H}$ be an algebraic reductive group, defined and split over $\rm F$. We assume that the split connected component of the center ... More

Super-jordanian deformation of the orthosymplectic Lie superalgebrasJun 19 1998The recently proposed jordanian quantization of the Lie superalgebra $osp(1|2)$ due to the embedding $sl(2) \subset osp(1|2)$, is extended including odd generators into the twisting element $\cal F$. This deformation is obtained as a contraction of the ... More

Investigating a Fluctuating-accretion Model for the Spectral-timing Properties of Accreting Black Hole SystemsDec 15 2005The fluctuating accretion model of Lyubarskii (1997) and its extension by Kotov et al. (2001), seeks to explain the spectral-timing properties of the X-ray variability of accreting black holes in terms of inward-propagating mass accretion fluctuations ... More

Point interaction in dimension two and three as models of small scatterersJul 03 1996In addition to the conventional renormalized--coupling--constant picture, point interactions in dimension two and three are shown to model within a suitable energy range scattering on localized potentials, both attractive and repulsive.

Enhancement of Tc by Sr substitution for Ba in Hg-2212 superconductorApr 16 2003Sep 23 2003The Ba substitution by Sr has been studied in two Hg-2212 series: Hg2(Ba(1-y)Sr(y))2YCu2O8-d and Hg2(Ba(1-y)Sr(y))2(Y0.80Ca0.20)Cu2O8-d. In both series a Tc enhancement of about 40 K is observed when Sr substitutes Ba from y = 0 to y = 1.0. The y = 0 ... More

Characteristic Relations for Quantum MatricesFeb 20 1995Feb 24 1995General algebraic properties of the algebras of vector fields over quantum linear groups $GL_q(N)$ and $SL_q(N)$ are studied. These quantum algebras appears to be quite similar to the classical matrix algebra. In particular, quantum analogues of the characteristic ... More

Inner Structure of Black Holes in Eddington-inspired Born-Infeld gravity: the role of mass inflationNov 10 2015We investigate the interior dynamics of accreting black holes in Eddington-inspired Born-Infeld gravity using the homogeneous approximation and taking charge as a surrogate for angular momentum, showing that accretion can have an enormous impact on their ... More

Primordial black hole constraints on non-gaussian inflation modelsOct 03 2005We determine the abundance of primordial black holes (PBHs) formed in the context of non-gaussian models with primordial density perturbations. We consider models with a renormalized $\chi^2$ probability distribution function parametrized by the number, ... More

Eddington-inspired Born-Infeld gravity: nuclear physics constraints and the validity of the continuous fluid approximationJul 19 2012In this paper we investigate the classical non-relativistic limit of the Eddington-inspired Born-Infeld theory of gravity. We show that strong bounds on the value of the only additional parameter of the theory \kappa, with respect to general relativity, ... More

Efficiency of the coherent biexciton admixture mechanism for multiple exciton generation in InAs nanocrystalsJun 23 2015We study the coherent mixing between two-particle (single exciton) and four-particle (biexciton) states of a semiconductor nanocrystal resulting from the coulomb coupling between states with different numbers of electron-hole pairs. Using a simple model ... More

Thermodynamic consistency for nuclear matter calculationsFeb 10 2001We investigate the relation between the binding energy and the Fermi energy and between different expressions for the pressure in cold nuclear matter. For a self-consistent calculation based on a $\Phi$ derivable $T-$matrix approximation with off-shell ... More

Laser probing of atomic Cooper pairsJan 24 2000We consider a gas of attractively interacting cold Fermionic atoms which are manipulated by laser light. The laser induces a transition from an internal state with large negative scattering length to one with almost no interactions. The process can be ... More

On the electron-energy loss spectra and plasmon resonance in cupratesMar 18 1999The consequences of the non-Drude charge response in the normal state of cuprates and the effect of the layered structure on electron-energy loss spectra are investigated, both for experiments in the transmission and the reflection mode. It is shown that ... More

Phase boundary and finite temperature crossovers of the quantum Ising model in two dimensionsJun 07 2009We revisit the two-dimensional quantum Ising model by computing renormalization group flows close to its quantum critical point. The low but finite temperature regime in the vicinity of the quantum critical point is squashed between two distinct non-Gaussian ... More

The contraction of $SU_μ(2)$ and its differential structures to $E_κ(2)$Jul 02 1998The deformed double covering of E(2) group, denoted by $\tilde{E}_\kappa(2)$, is obtained by contraction from the $SU_\mu(2)$. The contraction procedure is then used for producing a new examples of differential calculi: 3D-left covariant calculus on both ... More

Depurification by Lorentz boostsOct 23 2003We consider a particle of half-integer spin which is nonrelativistic in the rest frame. Assuming the particle is completely polarized along third axis we calculate the Bloch vector as seen by a moving observer. The result for its length is expressed in ... More

Deformed Galilei symmetryNov 24 1998A particular deformation of central extended Galilei group is considered. It is shown that the deformation influences the rules of constructing the composed systems while one particle states remain basically unaffected. In particular the mass appeared ... More

Three-Dimensional Two-Pion Emission Source at SPS: Extraction of Source Breakup Time and Emission DurationJul 30 2008A model-independent, three-dimensional source function for pion pairs has been extracted from Pb+Pb collisions at $\sqrt s_{NN}=17.3$ AGeV. The extracted sourc e exhibits long-range non-Gaussian tails in the directions of the pion-pair net transverse-momentum ... More

Probing gravity at sub-femtometer scales through the pressure distribution inside the protonFeb 04 2019Recently, a measurement of the pressure distribution experienced by the quarks inside the proton has found a strong repulsive (positive) pressure at distances up to 0.6 femtometers from its center and a (negative) confining pressure at larger distances. ... More

The Heun functions as a modern powerful tool for research in different scientific domainsDec 13 2015In this rather popular paper we stress some basics of the theory and the huge amount of applications of the Heun functions, as well as the still existing basic unsolved problems. The point is to attract more attention to this modern powerful tool for ... More

A Minimal Model for Dilatonic GravityNov 10 1999Dec 02 2000We study a new minimal scalar-tensor model of gravity with Brans-Dicke factor $\omega(\Phi)\equiv 0$ and cosmological factor $\Pi(\Phi)$. The constraints on $\Pi(\Phi)$ from known gravitational experiments are derived. We show that almost any time evolution ... More

A new approach to the connection problem for local solutions to the general Heun equationJun 28 2016Jul 03 2016We present new solution of the the connection problem for local solutions to the general Heun equation. Our approach is based on the symmetric form of the Heun's differential equation \cite{Fiziev14,Fiziev16} with four different regular singular points ... More

New path description for the M(k+1,2k+3) models and the dual Z_k graded parafermionsSep 11 2007May 28 2008We present a new path description for the states of the non-unitary M(k+1,2k+3) models. This description differs from the one induced by the Forrester-Baxter solution, in terms of configuration sums, of their restricted-solid-on-solid model. The proposed ... More

A quasi-particle description of the M(3,p) modelsJun 09 2005Oct 07 2005The M(3,p) minimal models are reconsidered from the point of view of the extended algebra whose generators are the energy-momentum tensor and the primary field \phi_{2,1} of dimension $(p-2)/4$. Within this framework, we provide a quasi-particle description ... More

Jagged partitions and lattice pathsMay 19 2006A lattice-path description of $K$-restricted jagged partitions is presented. The corresponding lattice paths can have peaks only at even $x$ coordinate and the maximal value of the height cannot be larger than $K-1$. Its weight is twice that of the corresponding ... More

Parafermionic derivation of Andrews-type multiple sumsMay 11 2005A multi-parafermion basis of states for the Z_k parafermionic models is derived. Its generating function is constructed by elementary steps. It corresponds to the Andrews multiple-sum which enumerates partitions whose parts separated by the distance k-1 ... More

Parafermionic character formulaeJun 29 2000We study various aspects of parafermionic theories such as the precise field content, a description of a basis of states (that is, the counting of independent states in a freely generated highest-weight module) and the explicit expression of the parafermionic ... More

Computing higher rank primitive root densitiesMar 20 2012Dec 29 2013We extend the character sum method for the computation of densities in Artin primitive root problems developed by H. W. Lenstra and the authors to the situation of radical extensions of arbitrary rank. Our algebraic set-up identifies the key parameters ... More

Pascal's triangle and word bases for blob algebra idealsJun 12 2007We give an elementary proof of isomorphism of the blob (diagram) algebra and the corresponding extended Temperley-Lieb algebra (defined by presentation).

The coincidence problem in linear dark energy modelsNov 01 2004Nov 12 2004We show that a solution to the the coincidence problem can be found in the context of a generic class of dark energy models with a scalar field, $\phi$, with a linear effective potential $V(\phi)$. We determine the fraction, $f$, of the total lifetime ... More

Could the dynamics of the Universe be influenced by what is going on inside black holes?Nov 01 2014Mar 26 2015We investigate the potential impact of mass inflation inside black holes on the dynamics of the Universe, considering a recent reformulation of general relativity, proposed in [1], which prevents the vacuum energy from acting as a gravitational source. ... More

Impact of the matter density uncertainty on the dark energy reconstructionMar 04 2009Jun 24 2009In this paper we study the impact of the fractional matter density uncertainty in the reconstruction of the equation of state of dark energy. We consider both standard reconstruction methods, based on the dynamical effect that dark energy has on the expansion ... More

Mass inflation in Eddington-inspired Born-Infeld black holes: analytical scaling solutionsFeb 26 2016We study the inner dynamics of accreting Eddington-inspired Born-Infeld black holes using the homogeneous approximation and taking charge as a surrogate for angular momentum. We show that there is a minimum of the accretion rate below which mass inflation ... More

Sensitivity of the Superconducting Transition Temperature to Changes in the Spin-Fluctuation Spectral WeightNov 20 2002In the simplest model of magnetic pairing, the transition temperature to the superconducting state depends on the dynamical susceptibility $\chi({\bf q},\omega)$. We discuss how $T_c$ is affected by different momentum and frequency parts of $\chi({\bf ... More

Description of Stellar Acoustic Modes Using the Local Wave ConceptJun 26 2006An understanding of stellar acoustic oscillations is attempted, using the local wave concept in semi-analytical calculations. The local homogeneity approximation allows to obtain simplified equations that can nevertheless describe the wave behavior down ... More

ad-nilpotent ideals of a Borel subalgebra IIIMar 05 2003Sep 30 2003This paper is devoted to a detailed study of certain remarkable posets which form a natural partition of all abelian ideals of a Borel subalgebra. Our main result is a nice uniform formula for the dimension of maximal ideals in these posets. We also obtain ... More

Resonance statistics in a microwave cavity with a thin antennaFeb 07 1997We propose a model for scattering in a flat resonator with a thin antenna. The results are applied to rectangular microwave cavities. We compute the resonance spacing distribution and show that it agrees well with experimental data provided the antenna ... More

Gribov Copies in Lattice QCDJun 15 1993We have performed an exhaustive search for Gribov copies on the lattice and their possible dependence from finite temperature effects. We show that, for each value of lattice size, Gribov copies are dense in configuration space at low temperature but ... More

ROSAT Observations of Compact Groups of GalaxiesDec 11 1994Dec 15 1994A search for X-ray emission from compact groups revealed detection from 8 out of the 12 HCG images extracted from the ROSAT public archive. For two of them the X-ray emission originates from galaxies in the group. On the contrary, three groups show an ... More

An analysis of the zero energy states in grapheneDec 09 2015Using the concept of complex non PT symmetric potential we study creation of zero energy states in graphene by a scalar potential. The admissible range of the potential parameter values for which such states exist has been examined. The situation with ... More

Particles in RSOS pathsJan 13 2009Mar 03 2009We introduce a new representation of the paths of the Forrester-Baxter RSOS models which represents the states of the irreducible modules of the minimal models M(p',p). This representation is obtained by transforming the RSOS paths, for the cases p> 2p'-2, ... More

Fermi-gas interpretation of the RSOS path representation of the superconformal unitary minimal modelsMay 15 2008Aug 12 2008We derive new finitized fermionic characters for the superconformal unitary minimal models by interpreting the RSOS configuration sums as fermi-gas partition functions. This extends to the supersymmetric case the method introduced by Warnaar for the Virasoro ... More