Results for "Walmir E. Pöttker"

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Versatile Hall magnetometer with variable sensitivity assembly for characterization of the magnetic properties of nanoparticlesMay 14 2019A Hall magnetometer with variable sensitivity is constructed to measure the magnetic properties of magnetic nanoparticles manufactured by different methods. This novel magnetometer can also be used to measure bulk materials and samples in liquids. The ... More
Versatile Hall magnetometer with variable sensitivity assembly for characterization of the magnetic properties of nanoparticlesMay 14 2019Jun 17 2019A Hall magnetometer with variable sensitivity is constructed to measure the magnetic properties of magnetic nanoparticles manufactured by different methods. This novel magnetometer can also be used to measure bulk materials and samples in liquids. The ... More
The Hodge polynomial of \Mbar_{3,1}Oct 30 1999We give formulas for the Dolbeault numbers of \Mbar_{3,1}, using the first author's calculations of the weights of the cohomology of M_{2,2} and M_{2,3} and the second author's calculation of the weights of the cohomology of M_{3,1}.
Numerical invariants for bundles on blow-upsJun 26 1999We suggest an effective procedure to calculate numerical invariants for rank two bundles over blown-up surfaces. We study the moduli spaces M_j of bundles on the blown-up plane splitting over the exceptional divisor as O(j)+O(-j). We use the numerical ... More
Can there be a general nonlinear PDE theory for the existence of solutions ?Jul 02 2004Contrary to widespread perception, there is ever since 1994 a unified, general type independent theory for the existence of solutions for very large classes of nonlinear systems of PDEs. This solution method is based on the Dedekind order completion of ... More
Short introduction to Nonstandard AnalysisJul 10 2004These lecture notes, to be completed in a later version, offer a short and rigorous introduction to Nostandard Analysis, mainly aimed to reach to a presentation of the basics of Loeb integration, and in particular, Loeb measures. The Abraham Robinson ... More
Two problems in Classical MechanicsJul 09 2004A problem about the present structure of dimensional analysis, and another one about the differences between solids and fluids are suggested. Both problems appear to have certain foundational aspects.
Playing with the enveloping algebra of supersymmetryJul 20 2016Oct 17 2016In this paper we show how to obtain from a scalar superfield its first component via a similarity transformation. We prove that in D=4 the generators of this similarity transformation live in the enveloping algebra of supersymmetry while for D=1 they ... More
The Average Temporal and Spectral Evolution of Gamma-Ray BurstsDec 26 1997We have averaged bright BATSE bursts to uncover the average overall temporal and spectral evolution of gamma-ray bursts (GRBs). We align the temporal structure of each burst by setting its duration to a standard duration, which we call T_<Dur>. The observed ... More
A Note on `Hot Spot' Hunting in Deep-Inelastic ScatteringMay 27 1993We consider the inclusive cross section for jet production with large transverse momentum in deep-inelastic scattering. This process has been proposed as a probe of small-x physics, particularly the measurement of `hot spots' inside the proton. We present ... More
Adiabatic quantum pumping in graphene with magnetic barriersMar 21 2013We study an adiabatic quantum pump effect in a two terminal graphene device with two oscillating square electric barriers and a stationary magnetic barrier using the scattering matrix approach. The model employs the low-energy Dirac approximation and ... More
Thermal radiation and inclusive production in the KLN model for ion-ion collisionsMay 13 2019We show that in order to obtain a successful description of the transverse momenta distribution for charged particles in ion-ion collisions, one must include a thermal emission term. The temperature of this emission $T_{\rm th}$ turns out to be proportional ... More
On the Shafarevich conjecture for surfaces of general type over function fieldsApr 22 1999Apr 30 1999For a non-isotrivial family of surfaces of general type over a complex projective curve, we give upper bounds for the degree of the direct images of powers of the relative dualizing sheaf. They imply that, fixing the curve and the possible degeneration ... More
Top Quarks at Photon CollidersSep 08 2000A review of results on top quark physics expected at the Photon Linear Colliders is presented.
The circumnuclear environment of IRAS 20551-4250 a case study of AGN/Starburst connection for JWSTDec 21 2011We present a general review of the current knowledge of IRAS 20551-4250 and its circumnuclear environment. This Ultraluminous Infrared Galaxy is one of the most puzzling sources of its class in the nearby Universe: the near-IR spectrum is typical of a ... More
Type-I superconductivity in ScGa3 and LuGa3 single crystalsMay 30 2012We present evidence of type-I superconductivity in single crystals of ScGa3 and LuGa3, from magnetization, specific heat, and resistivity measurements: low critical temperatures Tc = 2.1-2.2 K; field-induced secondto first-order phase transition in the ... More
Thermal radiation and inclusive production in the CGC/saturation approach at high energiesFeb 21 2019May 06 2019In this paper, we discuss the inclusive production of hadrons in the framework of CGC/saturation approach. We argue, that the gluon jet inclusive production stems from the vicinity of the saturation momentum, even for small values of the transverse momenta ... More
Azimuthal angle correlations at large rapidities: revisiting density variation mechanismSep 26 2017In the paper we discuss the angular correlation present in hadron-hadron collisions at large rapidity difference ($\bas\,y_{12}\,\gg\,1$). We find that in the CGC/saturation approach the largest contribution stems from the density variation mechanism. ... More
A new evolution equationMar 20 1995We propose a new evolution equation for the gluon density relevant for the region of small $x_B$. It generalizes the GLR equation and allows deeper penetration in dense parton systems than the GLR equation does. This generalization consists of taking ... More
Self-Dual Supergravity Theories in 2+2 DimensionsJun 26 1992Starting from the new minimal multiplet of supergravity in $2+2$ dimensions, we construct two types of self-dual supergravity theories. One of them involves a self-duality condition on the Riemann curvature and implies the equations of motion following ... More
Twistor-like Formulation of Super p-BranesDec 21 1993Closed super (p+2)-forms in target superspace are relevant for the construction of the usual super p-brane actions. Here we construct closed super (p+1)-forms on a {\it worldvolume superspace}. They are built out of the pull-backs of the Kalb-Ramond super ... More
Intergalactic Gas in Groups of Galaxies: Implications for Dwarf Spheroidal Formation and The Missing Baryons ProblemJul 05 2011Radio galaxies with bent jets are predominantly located in groups and clusters of galaxies. We use bent-double radio sources, under the assumption that their jets are bent by ram-pressure, to probe intragroup medium (IGM) gas densities in galaxy groups. ... More
Bent-Double Radio Sources as Probes of the Intragroup MediumJul 25 2007Galaxy groups likely contain a significant fraction of the total baryonic mass in the local universe within their intragroup medium (IGM). However, aside from a handful of UV absorption line and X-ray observations, almost nothing is known about the IGM. ... More
Bogoliubov sound speed in periodically modulated Bose-Einstein condensatesAug 11 2003We study the Bogoliubov excitations of a Bose-condensed gas in an optical lattice. Of primary interest is the long wavelength phonon dispersion for both current-free and current-carrying condensates. We obtain the dispersion relation by carrying out a ... More
Exact exponential bounds for the random field maximum distribution via the majoring measures (generic chaining)Feb 04 2008In this paper non-asymptotic exact exponential estimates are derived for the tail of maximum distribution of random field in the terms of majoring measures or, equally, generic chaining.
On the stationarity of linearly forced turbulence in finite domainsApr 28 2011May 08 2011A simple scheme of forcing turbulence away from decay was introduced by Lundgren some time ago, the `linear forcing', which amounts to a force term linear in the velocity field with a constant coefficient. The evolution of linearly forced turbulence towards ... More
Limits on Expanding Relativistic Shells from Gamma-Ray Burst Temporal StructureMay 06 1997We calculate the expected envelope of emission for relativistic shells under the assumption of local spherical symmetry. Gamma-Ray Burst envelopes rarely conform to the expected shape, which is similar to a FRED; a fast rise and exponential decay. The ... More
Super p-Brane Theories and New Spacetime SuperalgebrasApr 26 1995We present a geometric formulation of super $p$--brane theories in which the Wess--Zumino term is $(p+1)$--th order in the supersymmetric currents, and hence is manifestly supersymmetric. The currents are constructed using a supergroup manifold corresponding ... More
Thermal radiation and inclusive production in the CGC/saturation approach at high energiesFeb 21 2019In this paper, we discuss the inclusive production of hadrons in the framework of CGC/saturation approach. We argue, that the gluon jet inclusive production stems from the vicinity of the saturation momentum, even for small values of the transverse momenta ... More
Proximity effect and self-consistent field in a normal metal-superconductor structureMar 12 2019The concept of a self-consistent field in the theory of superconductivity based on the diagram method of the time-dependent perturbation theory is presented. It is shown that the well-known Bardeen-Cooper-Schrieffer equation for the order parameter of ... More
Energy evolution and the Bose-Einstein enhancement for double parton densitiesAug 15 2018Mar 12 2019In this paper we found that the Bose-Einstein enhancement generates the strong correlations, which increase with energy in the BFKL evolution. This increase leads to the double parton densities ( $\Phi$), that are much larger than the product of the single ... More
Quantum pumping in graphene nanoribbons at resonant transmissionDec 10 2010Adiabatic quantum charge pumping in graphene nanoribbon double barrier structures with armchair and zigzag edges in the resonant transmission regime is analyzed. Using recursive Green's function method we numerically calculate the pumped charge for pumping ... More
An integral representation of divisor function. An equation for prime numbersSep 16 2011A representation of divisor function $\tau(n)\equiv \sigma_{0}(n)$ by means of logarithmic residue of a function of complex variable is suggested. This representation may be useful theoretical instrument for further investigations of properties of natural ... More
Mesonic and Binding Contributions to the Nuclear Drell-Yan ProcessDec 01 1997We have evaluated the Drell-Yan cross section in nuclei paying special attention to the meson cloud contribution from pion and rho-meson, for which an accurate calculation using the meson nuclear spectral functions is used. Similarly, the nucleonic contribution ... More
On non-linear superfield versions of the vector-tensor multipletNov 06 1997Jan 30 1998We propose a harmonic superspace description of the non-linear vector-tensor N=2 multiplet. We show that there exist two inequivalent version: the old one in which one of the vectors is the field-strength of a gauge two-form, and a new one in which this ... More
Chiral fermion action with (8,0) worldsheet supersymmetryJun 13 1994We propose an action describing chiral fermions with an arbitrary gauge group and with manifest $(8,0)$ worldsheet supersymmetry. The form of the action is inspired by and adapted for completing the twistor-like formulation of the $D=10$ heterotic superstring. ... More
A Subjective Approach to Quantum ProbabilityMar 06 2005A likelihood order is defined over linear subspaces of a finite dimensional Hilbert space. It is shown that such an order that satisfies some plausible axioms can be represented by a quantum probability in two cases: pure state and uniform measure.
Gauge Invariant Classes of Feynman Diagrams and Applications for CalculationsJan 24 2001In theories like SM or MSSM with a complex gauge group structure the complete set of Feynman diagrams contributed to a particular physics process can be splited to exact gauge invariant subsets. Arguments and examples given in the review demonstrate that ... More
A question in the axiomatic approach to Quantum MechanicsJul 09 2004The classical Hilbert space formulation of the axioms of Quantum Mechanics appears to leave open the question whether the Hermitian operators which are associated with the observables of a finite non-relativistic quantum system are uniquely determined. ... More
Asymptotic exponential bounds for MLE deviation under minimal conditions via classical and generic chaining methodsMar 24 2009In this paper non-asymptotic exact exponential estimates are derived (under minimal conditions) for the tail of deviation of the MLE distribution in the so-called natural terms: natural function, natural distance, metric entropy, Banach spaces of random ... More
Maximal Inequalities in Bilateral Grand Lebesque Spaces Over Unbounded MeasureAug 24 2008In this paper non-asymptotic exact rearrangement invariant norm estimates are derived for the maximum distribution of the family elements of some rearrangement invariant (r.i.) space over unbounded measure in the entropy terms and in the terms of generic ... More
Bose-Einstein enhancement in the evolution of the double parton densities at high energyNov 07 2017Feb 01 2018In the paper we include Bose-Einsten correlations for identical gluons, in the evolution of the double parton densities at low $x$ (high energies). We show that these correlations result in a faster increase of the double densities, in comparison with ... More
Bose-Einstein correlations in perturbative QCD: $v_n$ dependence on multiplicityMay 21 2017May 26 2017In this paper we study the dependence of Bose-Einstein correlations on the multiplicity of an event. We found that events with large multiplicity, stem from the production of several parton showers, while the additional production of small multiplicity ... More
Off shell pi N amplitude and the p p->p p pi0 reactionMar 21 1995We have used a conventional model for the $pp \rightarrow pp \pi^{0}$ reaction consisting of the Born term plus the $s$-wave rescattering term. As a novelty we have introduced the off shell dependence of the $\pi N$ $s$-wave isoscalar amplitude. This ... More
Topologies and all that -- A TutorialMar 03 2015This is a brief introduction to the basic concepts of topology. It includes the basic constructions, discusses separation properties, metric and pseudometric spaces, and gives some applications arising from the use of topology in computing.
Jupiter and Super-Earth embedded in a gaseous discDec 19 2007In this paper we investigate the evolution of a pair of interacting planets - a Jupiter mass planet and a Super-Earth with the 5.5 Earth masses - orbiting a Solar type star and embedded in a gaseous protoplanetary disc. We focus on the effects of type ... More
Tame division algebras of prime period over function fields of $p$-adic curvesMar 09 2010Mar 30 2012Let F be a field of transcendence degree one over a p-adic field, and let l be a prime not equal to p. Results of Merkurjev and Saltman show that H^2(F,\mu_l) is generated by Z/l-cyclic classes. We prove the "Z/l-length" in H^2(F,\mu_l) equals the l-Brauer ... More
Functional limit theorems for Levy processes and their almost-sure versionsAug 07 2009In this paper we prove a criterion of convergence in distribution in Skorokhod space. We apply this criterion to some special Levy processes and obtain almost-sure versions of limit theorems for these processes.
Static and dynamic critical exponents in elastoplastic models of amorphous solidsMay 14 2019We analyze the behavior or different elastoplastic models approaching the yielding transition. We establish a family of static universal critical exponents which do not seem to depend on the dynamic details of the model rules. On the other hand, we discuss ... More
On certain definite integrals and infinite seriesSep 23 2013A translation of Kummer`s paper On certain definite integrals and infinite series
Basics of Quantum Computation (Part 1)Jul 08 2004The aim of this textbook is to bridge in regard of quantum computation what proves to be a considerable threshold even to the usual science trained readership between the level of science popularization, and on the other hand, the presently available ... More
Gamma-Ray Burst Spectra and Time Histories from 2 to 400 keVFeb 12 1998The Gamma-Ray burst detector on Ginga consisted of a proportional counter to observe the x-rays and a scintillation counter to observe the gamma-rays. It was ideally suited to study the x-rays associated with gamma-ray bursts (GRBs). Ginga detected 120 ... More
Strichartz type Inequalities for Parabolic and Schrödinger Equations in rearrangement invariant SpacesJan 18 2009In this paper we generalize the classical Strichartz estimation for solutions of initial problem for linear parabolic and Schr\"odinger PDE on many popular classes {\it pairs} of rearrangement invariant(r.i.) spaces and construct some examples in order ... More
Energy evolution of J/$\mathbfψ$ production in DIS on nucleiApr 07 2018In this paper we show, that the $J/\psi$ production in DIS, is the main source of information about the events with two parton shower production. We attempt to develop our theoretical acumen of this process, to a level compatible with the theoretical ... More
Perturbative QCD and beyond: azimuthal angle correlations in deuteron-deuteron scattering from Bose-Einstein correlationsNov 05 2016In this paper, we found within the framework of perturbative QCD, that in deuteron-deuteron scattering the Bose-Einstein correlations due to two parton showers production, induce azimuthal angle correlations, with three correlation lengths: the size of ... More
CGC/saturation approach: re-visiting the problem of odd harmonics in angular correlationsJul 08 2018In this paper we demonstrate that the selection of events with different multiplicities of produced particles, leads to the violation of the azimuthal angular symmetry, $\phi \to \pi - \phi$. We find for LHC and lower energies, that this violation can ... More
Quasielastic Versus Inelastic and Deep Inelastic Lepton Scattering in Nuclei at x > 1Dec 12 1996Feb 14 1997We have made a thorough investigation of the nuclear structure function W_2A in the region of 0.8 < x < 1.5 and Q^2 < 20 GeV^2, separating the quasielastic and inelastic plus deep inelastic contributions. The agreement with present experimental data is ... More
Isocalar Roper excitation in the pp --> pp pi0 reaction close to thresholdAug 07 1998A new mechanism for the pp --> pp pi0 reaction close to threshold is suggested coming from the isoscalar excitation of the Roper and its decay into N(pi pi)S-wave, with one of the pi0 emitted and the other one reabsorbed on the second nucleon. The mechanism ... More
How to solve smooth nonlinear PDEs in algebras of generalized functions with dense singularitiesJun 29 2004As a significant strengthening of properties of earlier algebras of generalized functions, here are presented classes of such algebras which can deal with dense singularities. In fact, the cardinal of the set of singular points can be larger than that ... More
A set-indexed fractional Brownian motionMar 11 2005Feb 06 2006We define and prove the existence of a fractional Brownian motion indexed by a collection of closed subsets of a measure space. This process is a generalization of the set-indexed Brownian motion, when the condition of independance is relaxed. Relations ... More
A continuous analogue of the invariance principle and its almost sure versionAug 07 2009We deal with random processes obtained from a homogeneous random process with independent increments by replacement of the time scale and by multiplication by a norming constant. We prove the convergence in distribution of these processes to Wiener process ... More
Temporal Evolution of the Pulse Width in GRBsDec 23 1998Many cosmological models of GRBs envision the energy source to be a cataclysmic stellar event leading to a relativistically expanding fireball. Particles are thought to be accelerated at shocks and produce nonthermal radiation. The highly variable temporal ... More
The Observational Basis for Central Engines in Gamma Ray BurstsJun 08 1999We review the observational differences between gamma-ray bursts occurring on a single shell (such as in the external shock model) and multiple shells (such as in the internal shock model). We do not argue against external shocks or for internal shocks, ... More
Couplings of self-dual tensor multiplet in six dimensionsMay 13 1996The (1,0) supersymmetry in six dimensions admits a tensor multiplet which contains a second-rank antisymmetric tensor field with a self-dual field strength and a dilaton. We describe the fully supersymmetric coupling of this multiplet to Yang-Mills multiplet, ... More
Elastic interfaces on disordered substrates: From mean-field depinning to yieldingMay 21 2019We consider a model of an elastic manifold driven on a disordered energy landscape, with generalized long range elasticity. Varying the form of the elastic kernel by progressively allowing for the existence of zero-modes, the model interpolates smoothly ... More
Quantum statistical modified entropic gravity as a theoretical basis for MONDFeb 18 2013May 10 2013Considering the quantum statistics of the degrees of freedom on the holographic screen it is shown that the ratio of the number of excited bulk degrees of freedom to the number of excited surface degrees of freedom, is given by the MOND interpolating ... More
Strings and CausalityNov 22 1993Notes of the author's talk at Cargese, May 19,1993. The calculation of the string field commutator is simplified by relating it to the short proper time, semiclassical string path integral.
Chiral dynamics of few-nucleon systemsOct 23 2007I discuss some recent developments in chiral effective field theory for few-nucleon systems.
Four-nucleon force using the method of unitary transformationOct 23 2007We discuss in detail the derivation of the leading four-nucleon force in chiral effective field theory using the method of unitary transformation. The resulting four-nucleon force is given in both momentum and configuration space. It does not contain ... More
Beam screen issuesAug 08 2011In the High Energy LHC (HE-LHC), a beam energy of about 16.5 TeV is currently contemplated. The beam screen issues linked to the use of 20 T dipole magnets instead of 8.33 T are discussed, with a particular emphasis on two mechanisms, the magneto-resistance ... More
RKKY Interaction in Graphene Calculated Following Ruderman and KittelJun 25 2011Aug 30 2011This paper has been withdrawn because it has been by far superseded by the Author's post arXiv:1108.1306v6, which was published on 30/08/2011.
Quasi-localization and quasi-mobility edge for light atoms mixed with heavy onesJun 05 2007Jan 17 2008A mixture of light and heavy atoms is considered. We study the kinetics of the light atoms, scattered by the heavy ones, the latter undergoing slow diffusive motion. In three-dimensional space we claim the existence of a crossover region (in energy), ... More
Lift force due to odd (Hall) viscosityJun 16 2016Oct 06 2016We study the problem of flow of a neutral gas past an infinite cylinder at right angle to its axis at low Reynolds number when the fluid is characterized by broken time-reversal invariance, and hence by odd viscosity in addition to the normal even one. ... More
While calculating RKKY interaction in graphene no theorist should do a cut-off without causeNov 14 2012Nov 19 2012In our previous work (E. Kogan, Phys. Rev. B 84, 115119 (2011)) we presented calculation of RKKY interaction between two magnetic impurities in graphene based on Matsubara Green's functions (MGF) in the coordinate -- imaginary time representation. Now ... More
On the symmetry of RKKY interaction on a bipartite latticeJul 25 2011Aug 30 2011This paper has been withdrawn because it has been by far superseded by the Author's post arXiv:1108.1306v6, which was published on 30/08/2011.
The Myth of the Twin ParadoxAug 01 2010One of the most discussed peculiarities of Einstein's theory of relativity is the twin paradox, the fact that the time between two events in space-time appears to depend on the path between these events. We show that this time discrepancy results only ... More
QCD Saturation and Soft ProcessesSep 11 2003We show that an approximate solution to the amended non-linear Balitsky-Kovchegov evolution equation which was formulated for hard QCD processes, can be extended to provide a good description of photoproduction and soft hadronic (non perturbative) reactions. ... More
Berry's phase for compact Lie groupsNov 30 2000The Lie group adiabatic evolution determined by a Lie algebra parameter dependent Hamiltonian is considered. It is demonstrated that in the case when the parameter space of the Hamiltonian is a homogeneous K\"ahler manifold its fundamental K\"ahler potentials ... More
Thermodynamics using Wilson and Staggered QuarksFeb 20 1998Recent developements in QCD at finite temperature are reviewed. Particular emphasis is laid on results stemming from simulations which involve quarks.
Numerical Evidence for Continuity of Mean Field and Finite Dimensional Spin GlassesJul 17 1998We study numerically a disordered model that interpolates among the Sherrington-Kirkpatrick mean field model and the three dimensional Edwards-Anderson spin glass. We find that averages over the disorder of powers of the overlap and of the full $P(q)$ ... More
Subalgebras and Discriminants of Anticommutative AlgebrasDec 05 1999The paper deals with the configuration of subalgebras in generic $n$-dimensional $k$-argument anticommutative algebras and ``regular'' anticommutative algebras.
On ambiguities of sign determination of the S-matrix from energy levels in a finite boxNov 16 2012In a recent paper the authors make a study on the determination of the S-matrix elements for scattering of particles in the infinite volume from the energy levels in the finite box for the case of multiple channels. The study is done with a toy model ... More
The lambda Bootis starsMay 06 1998In this article the current knowledge of the group of lambda Bootis stars is reviewed. These metal poor objects are quite outstanding compared to other chemically peculiar stars of the upper main sequence. Up to now no theory has been developed which ... More
Noncommutative Tachyons And String Field TheoryJun 10 2000It has been shown recently that by turning on a large noncommutativity parameter, the description of tachyon condensation in string theory can be drastically simplified. We reconsider these issues from the standpoint of string field theory, showing that, ... More
A Comment on The A/4 Black Hole EntropyOct 15 1996Using a simple analysis based on the measurement procedure for a quantized area we explain the 1/4 factor in the Bekenstein-Hawking black hole formula A/4 for the entropy.
Invariant Kinematics on a One-Dimensional Lattice in Noncommutative GeometryApr 16 1996Jul 04 1997In a one-dimensional lattice, the induced metric (from a noncommutative geometry calculation) breaks translation invariance. This leads to some inconsistencies among different spectator frames, in the observation of the hoppings of a test particle between ... More
A note of spaces of test and generalized functions of Poisson white noiseAug 15 2006The paper is devoted to construction and investigation of some riggings of the $L^2$-space of Poisson white noise. A particular attention is paid to the existence of a continuous version of a function from a test space, and to the property of an algebraic ... More
Orthogonal decompositions for Lévy processes with an application to the gamma, Pacsal, and Meixner processesApr 08 2002May 27 2002It is well known that between all processes with independent increments, essentially only the Brownian motion and the Poisson process possess the chaotic representation property (CRP). Thus, a natural question appears: What is an appropriate analog of ... More
Twisted Yangians and folded W-algebrasDec 19 2000We show that the truncation of twisted Yangians are isomorphic to finite W-algebras based on orthogonal or symplectic algebras. This isomorphism allows us to classify all the finite dimensional irreducible representations of the quoted W-algebras. We ... More
Anomalous Levy decoherenceJul 16 2001We investigate the decoherence of a small quantum system weakly coupled to a complex, chaotic environment when the dynamics is not Gaussian but Levy anomalous. By studying the time dependence of the linear entropy and the damping of the interference of ... More
Positive Energy for Asymptotically Anti-de Sitter Schwarzschild SpacetimesApr 11 1994Within the general class of Asymptotically Anti-de Sitter spacetimes that are asymptotic to the A-de-S Schwarzschild metric, we give a simple positive mass theorem based on arguments from causal structure. A general result for all asymptotically A-de-S ... More
J/$ψ$ production in In-In and p-A collisionsMar 20 2007The NA60 experiment studies dimuon production in In-In and p-A collisions at the CERN SPS. We report recent results on \jpsi production, measured through its muon pair decay. As a function of centrality, we show that in In-In the \jpsi yield is suppressed ... More
On quasar host galaxies as tests of non-cosmological redshiftsJun 06 2005Despite a general consensus in the astronomical community that all quasars are located at the distances implied by their redshifts, a number of observations still challenge this interpretation, possibly indicating that some subpopulation of quasars may ... More
Measuring Leptonic CP Violation with a Water CerenkovJul 01 2006In this talk, we present the physics case for a megaton Water Cerenkov detector in addressing some of the still pending questions in neutrino oscillations physics, particularly the measurement of leptonic CP violation. We compare different future beams ... More
Hadron-Gluon Interactions and the PomeronJun 21 2001Sep 17 2001An interaction term is added to the QCD Lagrangian involving hadron and gluon fields. An effective vertex is calculated for such interactions through exchanges of reggeized gluons. This gives rise to an effective coupling for hadron-gluon elastic scattering ... More
The Host Galaxies of Short-Duration Gamma-Ray Bursts: Luminosities, Metallicities, and Star Formation RatesMay 04 2008The association of some short-duration gamma-ray bursts (GRBs) with elliptical galaxies established that their progenitors, unlike those of long GRBs, belong to an old stellar population. However, the majority of short GRBs appear to occur in star forming ... More
Braneworld Cosmological ModelsOct 07 2004The main cosmological models on the brane are presented. A generic equation is given, from which the Friedmann equations of the Randall-Sundrum, induced gravity, Gauss-Bonnet and the combined induced gravity and Gauss-Bonnet cosmological models are obtained. ... More
p-Branes, D-Branes and M-BranesNov 13 1996We consider solutions to the string effective action corresponding to p-Branes, D-Branes and M-Branes and discuss some of their properties.
Quantum correlations in (1+1)-dimensional systemsSep 06 2005Contents: 1.- Introduction 2.- Scaling of entanglement in (1+1)-dimensional systems 3.- Entanglement and RG-flows 4.- Matrix Product States Appendix A.- Entanglement and order relations B.- Hilbert space in a conformal theory
Extended Hodge Theory for Fibred Cusp ManifoldsAug 14 2014For a particular class of pseudo manifolds, we show that the intersection cohomology groups for any perversity may be naturally represented by extended weighted $L^2$ harmonic forms for a complete metric on the regular stratum with respect to some weight ... More