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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
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
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
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
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
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
The PBW filtrationFeb 26 2007In this paper we study the PBW filtration on irreducible integrable highest weight representations of affine Kac-Moody algebra $\gh$. The $n$-th space of this filtration is spanned with the vectors $x_1... x_s v$, where $x_i\in\gh$, $s\le n$ and $v$ is ... 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
Effects of Stellar-Mass and the ISM on the Evolving Morphologies of Planetary NebulaeOct 24 2003A significant step forward in the understanding of Planetary Nebula (PN) formation can be achieved by exploring the connection of PN with stellar evolution. In particular, the initial mass of the star plays a crucial role, as it determines the evolutionary ... 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
A Winner-Take-All Approach to Emotional Neural Networks with Universal Approximation PropertyNov 08 2015Here, we propose a brain-inspired winner-take-all emotional neural network (WTAENN) and prove the universal approximation property for the novel architecture. WTAENN is a single layered feedforward neural network that benefits from the excitatory, inhibitory, ... 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
Note on the ring approximation in nuclear matterMay 01 2008The response function to an external prove is evaluated using the ring approximation in nuclear matter. Contrary to what it is usually assumed, it is shown that the summation of the ring series and the solution of the Dyson's equation are two different ... 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
The VLBA 2cm Survey: Kinematics of pc-Scale Structures in Active Galactic NucleiNov 11 2002The kinematics of jets in active galactic nuclei (QSOs, BL Lacs, Radio Galaxies and Empty Field objects) on parsec scales is being studied with Very Long Baseline Array observations at 15 GHz of a sample of more than 170 radio sources. More than 1000 ... 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
Black Holes in Models with Dilaton Field and Electric or Electric and Magnetic ChargesNov 10 2006Exact static spherically symmetric charged black holes in four dimensions are presented. One of them has only electric charge and another electric and magnetic charges. In these solutions the metric is asymptotically flat, has two horizons, irremovable ... 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
Controllability of Time-dependent Neutral Stochastic Functional Differential Equations Driven by a Fractional Brownian MotionMar 31 2015In this paper we consider the controllability of certain class of non-autonomous neutral evolution stochastic functional differential equations, with time varying delays, driven by a fractional Brownian motion in a separable real Hilbert space. Sufficient ... More
Mathematical Aspects of D-branesFeb 03 2004In these notes we review recent work on describing D-branes with nonzero Higgs vevs in terms of sheaves, which gives a physical on-shell D-brane interpretation to more sheaves than previously understood as describing D-branes. The mathematical ansatz ... More
The Laplace-Beltrami operator on surfaces with axial symmetryNov 08 1998A practical solution for the mathematical problem of functional calculus with Laplace-Beltrami operator on surfaces with axial symmetry is found. A quantitative analysis of the spectrum is presented.
Revivals of Zitterbewegung of a bound localized Dirac particleSep 18 2014In this paper a bound localized Dirac particle is shown to exhibit a revival of the zitterbewegung (ZB) oscillation amplitude. These revivals go beyond the known quasiclassical regenerations in which the ZB oscillation amplitude is decreasing from period ... More
$f(α)$ Multifractal spectrum at strong and weak disorderSep 26 2002Jul 14 2003The system size dependence of the multifractal spectrum $f(\alpha)$ and its singularity strength $\alpha$ is investigated numerically. We focus on one-dimensional (1D) and 2D disordered systems with long-range random hopping amplitudes in both the strong ... More
Critical level spacing distribution in long-range hopping HamiltoniansOct 31 2003Jun 29 2004The nearest level spacing distribution $P_c(s)$ of $d$-dimensional disordered models ($d=1$ and 2) with long-range random hopping amplitudes is investigated numerically at criticality. We focus on both the weak ($b^d \gg 1$) and the strong ($b^d \ll 1$) ... More
Multifractality of Hamiltonians with power-law transfer termsJun 02 2003Nov 07 2003Finite-size effects in the generalized fractal dimensions $d_q$ are investigated numerically. We concentrate on a one-dimensional disordered model with long-range random hopping amplitudes in both the strong- and the weak-coupling regime. At the macroscopic ... More
`Conformal Theories - AdS Branes' Transform, or One More Face of AdS/CFTMay 29 2003The AdS/CFT transformation relates two nonlinear realizations of (super)conformal groups: their realization in the appropriate field theories in Minkowski space with a Goldstone dilaton field and their realization as (super)isometry groups of AdS (super)spaces. ... More
Diverse PBGS Patterns and SuperbranesFeb 24 2000This is a brief account of the approach to superbranes based upon the concept of Partial Breaking of Global Supersymmetry (PBGS).
Solitary waves in three-dimensional crystal-like structuresAug 21 2009Nov 04 2009The motion of three-dimensional (3D) solitary waves and solitons in nonlinear crystal-like structures, such as photonic materials, is studied. It is demonstrated that collective excitations in these systems can be tailored to move in particular directions ... More
Metric-tensor flexible-cell algorithm for isothermal-isobaric molecular dynamics simulationsSep 19 2001An extended Hamiltonian approach to conduct isothermal-isobaric molecular dynamics simulations with full cell flexibility is presented. The components of the metric tensor are used as the fictitious degrees of freedom for the cell, thus avoiding the problem ... More
Computing collinear 4-Body Problem central configurations with given massesMar 31 2011An interesting description of a collinear configuration of four particles is found in terms of two spherical coordinates. An algorithm to compute the four coordinates of particles of a collinear Four-Body central configuration is presented by using an ... More
Analog cosmology with spinor Bose-Einstein condensatesDec 03 2007May 16 2008It is well known that both a particle with spin and a quantum field in a Bianchi type IX Universe are both related to the quantum mechanical top. In this paper we will combine these insights to show that the dynamics of a cold gas of noninteracting atoms ... More
Cavity basicsJan 16 2012The fields in rectangular and circular waveguides are derived from Maxwell's equations by superposition of plane waves. Subsequently the results are applied to explain cavity modes. Interaction of the cavity modes with a charged particle beam leads to ... More
The origin of IceCube's neutrinos: Cosmic ray accelerators embedded in star forming calorimetersNov 03 2015The IceCube collaboration reports a detection of extra-terrestrial neutrinos. The isotropy and flavor content of the signal, and the coincidence, within current uncertainties, of the 50 TeV to 2 PeV flux and the spectrum with the Waxman-Bahcall bound, ... More
Some uses of $ζ-$regularization in quantum gravity and cosmologyAug 19 2001This is a short guide to some uses of the zeta-function regularization procedure as a a basic mathematical tool for quantum field theory in curved space-time (as is the case of Nambu-Jona-Lasinio models), in quantum gravity models (in different dimensions), ... More
Explicit Zeta Functions for Bosonic and Fermionic Fields on a Noncommutative Toroidal SpacetimeDec 18 2000May 15 2001Explicit formulas for the zeta functions $\zeta_\alpha (s)$ corresponding to bosonic ($\alpha =2$) and to fermionic ($\alpha =3$) quantum fields living on a noncommutative, partially toroidal spacetime are derived. Formulas for the most general case of ... More
On the concept of determinant for the differential operators of Quantum PhysicsJun 29 1999The concept of determinant for a linear operator in an infinite-dimensional space is addressed, by using the derivative of the operator's zeta-function (following Ray and Singer) and, eventually, through its zeta-function trace. A little play with operators ... More
Complete determination of the singularity structure of zeta functionsAug 09 1996Aug 12 1996Series of extended Epstein type provide examples of non-trivial zeta functions with important physical applications. The regular part of their analytic continuation is seen to be a convergent or an asymptotic series. Their singularity structure is completely ... More
A comment on the theory of turbulence without pressure proposed by PolyakovAug 18 1995Nov 08 1995Owing to its lack of derivability, the dissipative anomaly operator appearing in the theory of turbulence without pressure recently proposed by Polyakov appears to be quite elusive. In particular, we give arguments that seem to lead to the conclusion ... More
The Vacuum Energy Density for Spherical and Cylindrical UniversesAug 10 1993The vacuum energy density (Casimir energy) corresponding to a massless scalar quantum field living in different universes (mainly no-boundary ones), in several dimensions, is calculated. Hawking's zeta function regularization procedure supplemented with ... More
On two complementary approaches aiming at the definition of the determinant of an elliptic partial differential operatorAug 30 1995We bring together two apparently disconnected lines of research (of mathematical and of physical nature, respectively) which aim at the definition, through the corresponding zeta function, of the determinant of a differential operator possessing, in general, ... More
Jet modification and a comparative study of hadron v2 measurements in sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC-PHENIXMay 07 2007In this analysis we measure the azimuthal angle($\phi$) dependence of hadrons with respect to the reaction plane ($\Psi_{RP}$) in events that were triggered by a high-$p_T$ $\pi^0$ of 5-10 GeV. Fitting the distribution of hadrons with a function of the ... More
Dark Matter Searche with GLASTApr 20 2007The Gamma-Ray Large Area Space Telescope (GLAST), scheduled to be launched in fall 2007, is the next generation satellite for high-energy gamma-ray astronomy. The Large Area Telescope (LAT), GLAST main instrument, with a wide field of view (> 2 sr), a ... More
The meaning of 1 in l(l+1)Mar 26 2008May 26 2009The magnitude of the angular momentum ($J^2$) in quantum mechanics is larger than expected from a classical model. We explain this deviation in terms of quantum fluctuations. A standard quantum mechanical calculation gives the correct interpretation of ... More
Optical turbulence forecast: toward a new era of ground-based astronomyDec 21 2009The simulation of the optical turbulence (OT) for astronomical applications obtained with non-hydrostatic atmospherical models at meso-scale presents, with respect to measurements, some advantages. The future of the ground-based astronomy relies upon ... More
On the numerical range of square matrices with coefficients in a degree 2 Galois field extensionNov 07 2016Let $L$ be a degree $2$ Galois extension of the field $K$ and $M$ an $n\times n$ matrix with coefficients in $L$. Let $\langle \ ,\ \rangle : L^n\times L^n\to L$ be the sesquilinear form associated to the involution $L\to L$ fixing $K$. We use $\langle ... More
Comments on the chemical and kinetic equilibration in heavy ion collisionsJan 01 2019I argue that perturbative scattering of quarks and gluons are incompatible with lattice and heavy ion data on QGP properties. The non-perturbative mechanisms for quasiparticle rescattering and quark production are briefly discussed, as well as experiments ... More
Arc spaces and DAHA representationsOct 07 2011Dec 02 2011A theorem of Y. Berest, P. Etingof and V. Ginzburg states that finite dimensional irreducible representations of a type A rational Cherednik algebra are classified by one rational number m/n. Every such representation is a representation of the symmetric ... More
Symmetries of some motivic integralsApr 05 2008We give an explicit formula for the motivic integrals related to the Milnor number over spaces of parametrised arcs on the plane with fixed tangency orders with the axis. These integrals are rational functions of the parameters and the class of the affine ... More
q,t-Catalan numbers and knot homologyMar 03 2010Oct 07 2011We propose an algebraic model of the conjectural triply graded homology of Gukov, Dunfield and Rasmussen for some torus knots. It turns out to be related to the q,t-Catalan numbers of Garsia and Haiman.
On divisorial filtrations on sheavesFeb 17 2005A notion of Poincar\'e series was introduced by A.Campillo et al. It was developed by Delgado and Gusein-Zade for a multi-index filtration corresponding to the sequence of blow-ups. The present paper suggests the way to generalize the notion of Poincar\'e ... More
On global attraction to stationary states for wave equations with concentrated nonlinearitiesNov 10 2016Nov 19 2016The global attraction to stationary states is established for solutions to 3D wave equations with concentrated nonlinearities: each finite energy solution converges as $t\to\pm\infty$ to stationary states. The attraction is caused by nonlinear energy ... More
Charmonium physics with heavy ions: experimental resultsNov 08 2016Thirty years ago, the suppression of charmonium production in heavy-ion collisions was first proposed as an unambiguous signature for the formation of a Quark-Gluon Plasma. Since then, experiments at fixed-target accelerators (SPS) and hadronic colliders ... More
A Massive Dark Object in the S0 galaxy NGC 4350Oct 02 2000We present a new detection of a Massive Dark Object in the S0 Galaxy NGC 4350, obtained applying a new dynamical model on ground-based photometric and kinematic data already present in literature.
Antisymmetric tensor unparticle and the radiative lepton flavor violating decaysDec 05 2011We study the contribution of the tensor unparticle mediation to the branching ratios of the radiative lepton flavor violating decays and predict a restriction region for free parameters of the scenario by using experimental upper limits. We observe that ... More
Lepton flavor conserving Z boson decays and scalar unparticleApr 15 2008Jun 16 2008We predict the contribution of scalar unparticle to the branching ratios of the lepton flavor conserving Z -> l^+ l^- decays and we study the discrepancy between the experimental and the QED corrected standard model branching ratios. We observe that these ... More
Lepton flavor violating Z boson decays induced by scalar unparticleFeb 09 2008We predict the branching ratios of the lepton flavor violating Z boson decays Z\to e^{\pm} \mu^{\pm}, Z\to e^{\pm} \tau^{\pm} and Z\to \mu^{\pm} \tau^{\pm} in the case that the lepton flavor violation is carried by the scalar unparticle mediation. We ... More
The noncommutative effects on the dipole moments of fermions in the standard modelApr 10 2003We study the dipole moments, electric dipole moment, weak electric dipole moment, anomalous magnetic moment, anomalous weak magnetic moment, of fermions in the noncommutative extension of the SM. We observe that the noncommutative effects are among the ... More
Indicatrix geometry clarifies that Finsler length can be larger than relative lengthJul 05 2018I show that Matsumoto conjectured inequality between relative length and Finsler length is false. The incorrectness of the claim is easily inferred from the geometry of the indicatrix.
Future directions in kaonic atom physicsNov 30 2011Recent progress and open problems in kaonic atom physics are presented. A connection between phenomenological deep potentials and the underlying $K^-N$ interaction is established as well as the need for a theory for multinucleon absorption of kaons. $K^-$ ... More
Low-Energy Antinucleon-Nucleus Interaction RevisitedFeb 25 2015Annihilation cross sections of antiprotons and antineutrons on the proton between 50 and 400 MeV/c show Coulomb focusing below 200 MeV/c and almost no charge-dependence above 200 MeV/c. Similar comparisons for heavier targets are not possible for lack ... More
Evidence for partial chiral symmetry restoration from pionic atomsJul 17 2001Aug 01 2001Extensive data on strong interaction effects in pionic atoms are analyzed with a density-dependent isovector scattering amplitude suggested recently by Weise to result from a density dependence of the pion decay constant. Most of the so-called `missing ... More
Medium Effects of Low Energy PionsOct 01 2003Fits of pion-nucleus potentials to large sets of pionic atom data reveal departures of parameter values from the corresponding free $\pi N$ parameters. These medium effects can be quantitatively reproduced by a chiral-motivated model where the pion decay ... More
Random Language Model: a path to principled complexitySep 04 2018Many complex generative systems use languages to create structured objects. We consider a model of random languages, defined by weighted context-free grammars. As the distribution of grammar weights broadens, a transition is found from a random phase, ... More
Light Quark Spin-Flavor Symmetry for Baryons Containing a Heavy Quark in Large N QCDJul 11 1993The couplings and interactions of baryons containing a heavy quark are related by light quark spin-flavor symmetry in the large $N$ limit. The single pion coupling constant which determines all heavy quark baryon-pion couplings is equal to the pion coupling ... More
Baryon Hyperfine Mass Splittings in Large N QCDJul 11 1993The hyperfine mass splittings of baryons in large $N$ QCD are proved to be proportional to ${\bf J}^2$. Hyperfine mass splittings are first allowed at order $1/N$ in the $1/N$ expansion.