Results for "Zs. Bognár"

total 19645took 0.10s
White Dwarf Period Tables - I. Pulsators with hydrogen-dominated atmospheresOct 24 2016We aimed at collecting all known white dwarf pulsators with hydrogen-dominated atmospheres and list their main photometric and atmospheric parameters together with their pulsation periods and amplitudes observed at different epochs. For this purpose, ... More
GD 244: asteroseismology of a pulsator in the middle of the ZZ Ceti instability stripJun 23 2015We present our preliminary results on the asteroseismological investigations of the ZZ Ceti star GD 244. We used literature values of the effective temperature and surface gravity and utilized the White Dwarf Evolution Code of Bischoff-Kim, Montgomery ... More
One new variable candidate and six nonvariable stars at the ZZ Ceti instability stripFeb 08 2019We present our results on the continuation of our survey searching for new ZZ Ceti stars, inspired by the recently launched TESS space mission. The seven targets were bright DA-type white dwarfs located close to the empirical ZZ Ceti instability strip. ... More
KIC 2831097 - A 2-year orbital-period RR Lyrae binary candidateSep 21 2016We report the discovery of a new Kepler first-overtone RR Lyrae pulsator, KIC 2831097. The pulsation shows large, 0.1 d amplitude, systematic phase variations that can be interpreted as light travel-time effect caused by orbital motion in a binary system, ... More
Light Curve Patterns and Seismology of a White Dwarf with Complex PulsationSep 01 2009The ZZ Ceti star KUV 02464+3239 was observed over a whole season at the mountain station of Konkoly Observatory. A rigorous frequency analysis revealed 6 certain periods between 619 and 1250 seconds, with no shorter period modes present. We use the observed ... More
GD 99 - an unusual, rarely observed DAV white dwarfAug 01 2007New observations of GD 99 are analysed. The unusual pulsation behaviour, showing both long and short periods, has been confirmed. All the available periods show a grouping of short and long period modes with roughly regular spacing. If we interpret the ... More
Amplitude Modulation in the ZZ Ceti Star GD 244Jun 23 2015Previous studies of GD 244 revealed seven pulsation frequencies (two doublets and three single periods) in the light variations of the star. The data obtained at McDonald Observatory between 2003 and 2006, and our additional measurements in 2006 and 2007 ... More
Binary systems with an RR Lyrae component - progress in 2016Jan 20 2017In this contribution, we summarize the progress made in the investigation of binary candidates with an RR Lyrae component in 2016. We also discuss the actual status of the RRLyrBinCan database.
Characterizing the pulsations of the ZZ Ceti star KUV 02464+3239Sep 01 2009We present the results on period search and modeling of the cool DAV star KUV 02464+3239. Our observations resolved the multiperiodic pulsational behaviour of the star. In agreement with its position near the red edge of the DAV instability strip, it ... More
G 207-9 and LP 133-144: light curve analysis and asteroseismology of two ZZ Ceti starsJun 30 2016G 207-9 and LP 133-144 are two rarely observed ZZ Ceti stars located in the middle and close to the blue edge of the ZZ Ceti instability domain, respectively. We aimed to observe them at least during one observing season at Konkoly Observatory with the ... More
Revealing the pulsational properties of the V777 Her star KUV 05134+2605 by its long-term monitoringAug 15 2014Context: KUV 05134+2605 is one of the 21 pulsating DB white dwarfs (V777 Her or DBV variables) known so far. The detailed investigation of the short-period and low-amplitude pulsations of these relatively faint targets requires considerable observational ... More
Searching for new white dwarf pulsators for TESS observations at Konkoly ObservatoryMay 25 2018We present the results of our survey searching for new white dwarf pulsators for observations by the TESS space telescope. We collected photometric time-series data on 14 white dwarf variable-candidates at Konkoly Observatory, and found two new bright ... More
More frequencies of KUV 02464+3239Aug 01 2007Preliminary results on KUV 02464+3239, a pulsating DA white dwarf are presented. Located near the red edge of the DAV instability strip, KUV 02464+3239 shows large amplitude and long period pulsation modes. Up to now only one mode was known from a 50-minute-long ... More
KIC 9533489: a genuine gamma Doradus-delta Scuti Kepler hybrid pulsator with transit eventsJun 04 2015Context: Several hundred candidate hybrid pulsators of type A-F have been identified from space-based observations. Their large number allows both statistical analyses and detailed investigations of individual stars. This offers the opportunity to study ... More
Multi-technique investigation of the binary fraction among A-F type candidate hybrid variable stars discovered by KeplerSep 11 2017Hundreds of candidate hybrid pulsators of intermediate type A-F were revealed by the recent space missions. Hybrid pulsators allow to study the full stellar interiors, where p- and g-modes are simultaneously excited. The true hybrid stars must be identified ... More
Contactless Thermal Characterization Method of PCB-s Using Different IR Sensor ArraysSep 12 2007In this paper the methodology and the results of a quasi real-time thermal characterization tool and method for the temperature mapping of circuits and boards based on sensing the infrared radiation will be introduced. With the proposed method the IR ... More
Wandering near the red edge: photometric observations of three cool ZZ Ceti starsOct 23 2018We summarize our findings on three cool ZZ Ceti type pulsating white dwarfs. We determined eight independent modes in HS 0733+4119, of which seven are new findings. For GD 154, we detected two new eigenmodes, and the recurrence of the pulsational behaviour ... More
MOST light-curve analysis of the gamma Dor pulsator HR 8799, showing resonances and amplitude variationsJul 01 2014Context: The central star of the HR 8799 system is a gamma Doradus-type pulsator. The system harbours four planetary-mass companions detected by direct imaging, and is a good solar system analogue. The masses of the companions are not known accurately, ... More
Three-jet event-shapes in lepton-proton scattering at next-to-leading order accuracyNov 29 2005Feb 13 2006We compute the differential distributions of two three-jet event-shape observables at the next-to-leading order accuracy at fixed values of the DIS kinematic variables. The observable $\Kout$ measures the out-of-event-plane momentum. The other observable ... More
Energy Cascades in Physical Scales of 3D Incompressible Magnetohydrodynamic TurbulenceNov 08 2012Jul 29 2013The existence of a total energy cascade and the scale-locality of the total energy flux are rigorously established working directly from the 3D MHD equations and under assumptions consistent with physical properties of turbulent plasmas. Secondary results ... More
Limits of the Quantum Monte Carlo methodDec 21 1999We consider the one-dimensional quantum-statistical problem of interacting spin-less particles in an infinite deep potential valley and on a ring. Several limits for the applicability of the Quantum Monte Carlo (QMC) methods were revealed and discussed. ... More
Multijet rates in e+e- annihilation: perturbation theory versus LEP dataAug 19 1998Sep 14 1998We show that the next-to-leading order perturbative prediction, matched with the next-to-leading logarithmic approximation for predicting both two-, three- and four-jet rates using the Durham jet-clustering algorithm, in the 0.001 < ycut < 0.1 range gives ... More
On the transport and concentration of enstrophy in 3D magnetohydrodynamic turbulenceNov 13 2012Jun 27 2013Working directly from the 3D magnetohydrodynamical equations and entirely in physical scales we formulate a scenario wherein the enstrophy flux exhibits cascade-like properties. In particular we show the inertially-driven transport of current and vorticity ... More
Classical and quantum massive stringApr 11 1995The classical and the quantum massive string model based on a modified BDHP action is analyzed in the range of dimensions $1<d<25$. The discussion concerning classical theory includes a formulation of the geometrical variational principle, a phase-space ... More
Analytic self-similar solutions of the Kardar-Parisi-Zhang interface growing equation with various noise termApr 03 2019The one-dimensional Kardar-Parisi-Zhang dynamic interface growth equation with the self-similar Ansatz is analyzed. As a new feature additional analytic terms are added. From the mathematical point of view, these can be considered as various noise distribution ... More
A spatially localized $L \log L$ estimate on the vorticity in the 3D NSESep 10 2013Feb 07 2014The purpose of this note is to present a spatially localized $L \log L$ bound on the vorticity in the 3D Navier-Stokes equations, assuming a very mild, \emph{purely geometric} condition. This yields an extra-log decay of the distribution function of the ... More
Merging Galaxies with Tidal Tails in COSMOS to z=1Aug 15 2016Tidal tails are created in major mergers involving disk galaxies. How the tidal tails trace the assembly history of massive galaxies remains to be explored. We identify a sample of 461 merging galaxies with long tidal tails from 35076 galaxies mass-complete ... More
Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2Jun 03 2019We present the first results from the Transiting Exoplanet Survey Satellite (TESS) on the rotational and pulsational variability of magnetic chemically peculiar A-type stars. We analyse TESS 2-min cadence data from sectors 1 and 2 on a sample of 83 stars. ... More
Classical Field Theory and Analogy Between Newton's and Maxwell's EquationsDec 02 1993A bivertical classical field theory include the Newtonian mechanics and Maxwell's electromagnetic field theory as the special cases. This unification allows to recognize the formal analogies among the notions of Newtonian mechanics and Maxwell's electrodynamics. ... More
Hard Diffractive ScatteringOct 01 1997I discuss hard diffractive scattering in the framework of perturbative QCD and Regge-parametrization.
Theoretical Aspects of Higgs Hunting at LHCApr 08 1997I discuss recent developments in the theoretical study of Higgs search at LHC.
Thermalization Processes in Interacting Anderson InsulatorsJan 06 2015Jan 15 2015This paper describes experiments utilizing a unique property of electron-glasses to gain information on the fundamental nature of the interacting Anderson-localized phase. The methodology is based on measuring the energy absorbed by the electronic system ... More
Suppression of inelastic electron-electron scattering in Anderson InsulatorsMar 03 2012Apr 13 2012We report on measurements of absorption from applied ac fields in Anderson-localized indium-oxide films. The absorption shows a roll-off at a frequency that is much smaller than the electron-electron scattering rate measured at the same temperature in ... More
Relaxation dynamics in quantum electron-glassesOct 14 2007Nov 28 2007It is experimentally shown that, depending on the carrier-concentration of the system $n$, the dynamics of electron-glasses either \textit{slows down }with increasing temperature or it is \textit{independent} of it. This also correlates with the dependence ... More
Temperature and field dependence of Dynamics in the Electron-GlassOct 31 2006We describe several experimental methods to quantify dynamics in electron glasses and illustrate their use in the glassy phase of crystalline indium-oxide films. These methods are applied to study the dependence of dynamics on temperature and on non-ohmic ... More
Relativistic perfect fluid modelsNov 28 1999The various schemes for studying rigidly rotating perfect fluids in general relativity are reviewed. General conclusions one may draw from these are: (i) There is a need to restrict the scope of the possible ansatze, and (ii) the angular behaviour is ... More
Eigenvalue Formulation of Quantum Mechanics Near Closed Timelike CurvesJan 23 2012Einstein's field equations of gravitation are known to admit closed timelike curve (CTC) solutions. Deutsch approached the problem from the quantum information point of view and proposed a self-consistency condition. In this work, the Deutsch equation ... More
Influence of the relict cosmological constant on accretion discsApr 14 2008Surprisingly, the relict cosmological constant has a crucial influence on properties of accretion discs orbiting black holes in quasars and active galactic nuclei. We show it by considering basic properties of both the geometrically thin and thick accretion ... More
Schrodinger Equation cannot Describe Transition ProcessesJan 09 2001In this paper we prove the following: (1) The basic error of time-dependent perturbation theory is using the sum of first finite order of perturbed solutions to substitute the exact solution in the divergent interval of the series for calculating the ... More
On the role of the curvature drift instability in the dynamics of electrons in active galactic nucleiJul 24 2009Aug 06 2013We study the influence of the centrifugally driven curvature drift instability (CDI) on the dynamics of relativistic electrons in the magnetospheres of active galactic nuclei (AGN). We generalize our previous work by considering relativistic particles ... More
Equivalences between spin models induced by defectsJan 16 2006May 21 2006The spectrum of integrable spin chains are shown to be independent of the ordering of their spins. As an application we introduce defects (local spin inhomogeneities in homogenous chains) in two-boundary spin systems and, by changing their locations, ... More
On the topological classification of binary trees using the Horton-Strahler indexAug 27 2001Sep 08 2001The Horton-Strahler (HS) index $r=\max{(i,j)}+\delta_{i,j}$ has been shown to be relevant to a number of physical (such at diffusion limited aggregation) geological (river networks), biological (pulmonary arteries, blood vessels, various species of trees) ... More
Prospects for Testing Lorentz and CPT Invariance in the Top-Quark SectorJul 22 2016We present how to further the search for Lorentz and CPT violation in the top-quark sector after the first measurement in this sector by D0. We compute the Lorentz-violating matrix element for top pair production via gluon fusion, which allows a similar ... More
Transition to exponential relaxation in weakly-disordered electron-glassesMay 18 2018The out-of-equilibrium excess conductance of electron-glasses typically relaxes with a logarithmic time-dependence. Here it is shown that the log(t) relaxation of a weakly-disordered amorphous indium-oxide films crosses-over asymptotically to an exponential ... More
TAUOLA, TAUOLA universal interface PHOTOS and MC-TESTER: Status ReportJan 13 2009The status of Monte Carlo programs for the simulation of tau-lepton production and decay in high-energy accelerator experiments is reviewed. No basic changes in the organization of the programs were necessary since the previous tau-lepton conference in ... More
Trefoil knot and ad-hoc classification of elementary fields in the Standard ModelJul 11 1997We present an arbitrary model based on the trefoil knot to construct objects of the same spectrum as that of elementary particles. It includes `waves' and three identical sets of sources. Due to Lorentz invariance, `waves' group into 3 types of 1, 3 and ... More
A field-theoretical approach to the extended Hubbard modelFeb 01 2010We transform the quartic Hubbard terms in the extended Hubbard model to a quadratic form by making the Hubbard-Stratonovich transformation for the electron operators. This transformation allows us to derive exact results for mass operator and charge-charge ... More
Cavity polaritons in the presence of symmetry-breaking disorder: closed-path time formalismJul 17 2007According to the mean-field theory of Zittartz, when subject to a symmetry-breaking disorder, the order parameter and the energy gap of an excitonic insulator are gradually suppressed up to a critical disorder strength. Recently, Marchetti, Simons, and ... More
Unobstructedness of Calabi-Yau OrbiKleinfoldsAug 31 1993We show that Calabi-Yau spaces with certain types of hypersurface- quotient singularities have unobstructed deformations. This applies in particular to all Calabi-Yau orbifolds nonsingular in codimension 2.
Centeral Armendariz rings relative to a monoidOct 13 2014In this paper, the notion of central Armendariz rings relative to a monoid is introduced which is a generalization of central Armendariz rings and investigate their properties. It is shown that if R is central reduced, then R is M-central Armendariz for ... More
On final states of 2D decaying turbulenceJan 12 2004Numerical and analytical studies of "final states" of two-dimensional (2D) decaying turbulence are reported. The first part of this work is trying to give a definition for final states of 2D decaying turbulence. Although the functional relation of $\omega-\psi$ ... More
Slow-roll versus stochastic slow-rollMay 16 2019We consider the classical wave equation with a thermal and Starobinsky-Vilenkin noise which in a slow-roll approximation describes the quantum fluctuations of the graviton-inflaton system in an expanding metric. We investigate the resulting consistent ... More
New exact analytical results for two quasiparticle excitation in the fractional quantum Hall effectJun 27 2019In this work, two quasiparticle excitation energies per particle are calculated analytically for systems with up to $N = 7$ electrons in both Laughlin and composite fermions (CF) theories by considering the full jellium potential which consists of three ... More
A possible solution for the lack of EHB binaries in globular clustersApr 29 2008May 02 2008The binary fraction among extreme horizontal branch (EHB) stars in Galactic globular clusters (GCs) is an order of magnitude lower than the binary fraction among their counterparts, field hot subdwarfs. This casts serious doubt on their formation channels. ... More
Flavor Symmetries and the Description of Flavor MixingJul 02 1997It is shown that the hierarchical structure of the quark mass terms in the standard model suggests a new description of the flavor mixing. The latter is primarily a heavy quark mixing involving the t and b quarks, followed by a mixing exclusively in the ... More
Core-Polarization and Relativistic Effects in Electron Affinity Calculations for Atoms: A Complex Angular Momentum InvestigationOct 06 2015Core-polarization interactions are investigated in low-energy electron elastic scattering from the atoms In,Sn,Eu,Au and At through the calculation of their electron affinities. The complex angular momentum method wherein is embedded the vital electron-electron ... More
Geometric phase and phase diagram for non-Hermitian quantum XY modelAug 19 2013We study the geometric phase for the ground state of a generalized one-dimensional non-Hermitian quantum XY model, which has transverse-field-dependent intrinsic rotation-time reversal symmetry. Based on the exact solution, this model is shown to have ... More
Non-Hermitian anisotropic XY model with intrinsic rotation-time reversal symmetryOct 20 2012We systematically study the non-Hermitian version of the one-dimensional anisotropic XY model, which in its original form, is a unique exactly solvable quantum spin model for understanding the quantum phase transition. The distinguishing features of this ... More
The Cohomology of Transitive Lie AlgebroidsDec 27 2007For a transitive Lie algebroid A on a connected manifold M and its a representation on a vector bundle F, we study the localization map Y^1: H^1(A,F)-> H^1(L_x,F_x), where L_x is the adjoint algebra at x in M. The main result in this paper is that: Ker ... More
Integrable Extensions of N=2 Supersymmetric KdV Hierarchy Associated with the Nonuniqueness of the Roots of the Lax operatorMay 19 1998We preesent a new supersymmetric integrable extensions of the a=4,N=2 KdV hierarchy. The root of the supersymmetric Lax operator of the KdV equation is generalized, by including additional fields. This generalized root generate new hierarchy of integrable ... More
New Integrable Models from FusionMar 03 1999May 13 1999Integrable multistate or multiflavor/color models were recently introduced. They are generalizations of models corresponding to the defining representations of the U_q(sl(m)) quantum algebras. Here I show that a similar generalization is possible for ... More
The benefits of the orthogonal LSM modelsNov 28 2007In the last few decades both the volume of high-quality observing data on variable stars and common access to them have boomed; however the standard used methods of data processing and interpretation have lagged behind this progress. The most popular ... More
Hubbard Models as Fusion Products of Free FermionsNov 14 1997Dec 23 1997A class of recently introduced su(n) `free-fermion' models has recently been used to construct generalized Hubbard models. I derive an algebra defining the `free-fermion' models and give new classes of solutions. I then introduce a conjugation matrix ... More
Comment on "Discrepancies in the resonance-fluorescence spectrum calculated with two methods"Aug 26 2008There are two alternative methods used in literature to calculate the incoherent part of the spectrum of light scattered by an atomic system. In the first, one calculates the spectrum of the total light scattered by the system and obtains the incoherent ... More
On detection of the free inner core nutation from VLBI dataSep 20 2013Several attempts to discover the FICN signal in VLBI nutation series made during last years failed. In this paper, we present some results of our further steps in this direction, unfortunately not successful either. We investigated several VLBI CPO series ... More
Black hole solution in third order Lovelock gravity has no Gauss-Bonnet limitNov 19 2013We revisit the spherically symmetric third order Lovelock black hole solution in 7-dimensions. We show that the general solution for the metric function does not admit the Gauss-Bonnet (GB) limit. This is not expected due to the linear superposition of ... More
Microwave-Enhanced hopping-conductivity; a non-Ohmic EffectOct 01 2011Hopping conductivity is enhanced when exposed to microwave fields (Phys. Rev. Lett., 102, 206601, 2009). Data taken on a variety of Anderson-localized systems are presented to illustrate the generality of the phenomenon. Specific features of these results ... More
Intrinsic electron-glass effects in strongly-localized thallium-oxide filmsAug 07 2013Transport measurements made on films of thallium-oxide (n-type semiconductor) are presented and discussed. The focus in this work is on the strongly-localized regime where charge transport is by variable-range-hopping. It is demonstrated that, at liquid-helium ... More
First results from the asymmetric O(a) improved Fermilab actionOct 01 1999We present first results from calculations using O(a) improved (FNAL) space-time asymmetric action on a 12^3 x 24 quenched lattice at \beta = 5.7 and c_SW = 1.57. The asymmetry parameter is determined non-perturbatively from the energy-momentum dispersion ... More
THE ELECTROWEAK PHASE TRANSITION ON THE LATTICEMar 14 1995The finite temperature electroweak phase transition is studied on the lattice. The results of the simulations obtained by the 3-dimensional effective theories and the 4-dimensional SU(2)-Higgs model are reviewed.
A brief comment on the chemical formulae of the rare earth iron arsenide oxide superconductorsMay 30 2008Just a brief comment on the chemical formulae of the rare earth iron arsenide oxide superconductors
Is very high energy emission from the BL Lac 1ES 0806+524 centrifugally driven?Jan 09 2009Oct 13 2009We investigate the role of centrifugal acceleration of electrons in producing the very high energy (VHE) radiation from the BL Lac object 1ES 0806+524, recently detected by VERITAS. The efficiency of the inverse Compton scattering (ICS) of the accretion ... More
Relationships among coefficients in deterministic and stochastic transient diffusionSep 01 1997Systems are studied in which transport is possible due to large extension with open boundaries in certain directions but the particles responsible for transport can disappear from it by leaving it in other directions, by chemical reaction or by adsorption. ... More
On the free field realization of $WBC_n$ algebrasFeb 26 1997Jan 01 1997Defining the $WBC_n$ algebras as the commutant of certain screening charges a special form for the classical generators is obtained which does not change under quantisation. This enables us to give explicitly the first few generators in a compact form ... More
Singular vectors of the $WA_2$ algebraMar 06 1994The null vectors of an arbitrary highest weight representation of the $WA_2$ algebra are constructed. Using an extension of the enveloping algebra by allowing complex powers of one of the generators, analysed by Kent for the Virasoro theory, we generate ... More
QCD for collider experimentsAug 08 2016These lectures are intended to provide the theoretical basis of describing high-energy particle collisions at a level appropriate to graduate students in experimental high energy physics. They are supposed to be familiar with quantum electrodynamics, ... More
Strings and Discrete Fluxes of QCDMar 01 1999Dec 04 1999We study discrete fluxes in four dimensional SU(N) gauge theories with a mass gap by using brane compactifications which give ${\cal{N}} = 1$ or ${\cal{N}} = 0$ supersymmetry. We show that when such theories are compactified further on a torus, the t'Hooft ... More
Smooth coalgebrasDec 23 1997A complete mathematical framework for coalgebraic formulation of supergeometry and its infinite-dimensional extension is proposed. Within this approach a supermanifold is defined as a graded coalgebra endowed with a smooth structure. The category of such ... More
Constructing regular self-similar solutions to the 3D Navier-Stokes equations originating at singular and arbitrary large initial dataOct 10 2003Global-in-time smooth self-similar solutions to the 3D Navier-Stokes equations are constructed emanating from homogeneous of degree -1 arbitrary large initial data belonging only to the closure of the test functions in the space of uniformly-locally square-integrable ... More
Solvable models for unitary and non-unitary topological phasesJun 22 2014Aug 12 2014We introduce a broad class of simple models for quantum Hall states based on the expansion of their parent Hamiltonians near the one-dimensional limit of "thin cylinders", i.e. when one dimension $L_y$ of the Hall surface becomes comparable to the magnetic ... More
2/3 Splitting in SUSY GUT -- Higgs as Goldstone BosonMar 26 1997We briefly review the GIFT (Goltstones instead of Fine Tuning) mechanism which provides a promising solution to the doublet-triplet splitting problem and some other puzzles of the supersymmetric grand unification as are the $\mu$-problem, the fermion ... More
Polygon model from first order gravityOct 04 2004Jan 16 2005The gauge fixed polygon model of 2+1 gravity with zero cosmological constant and arbitrary number of spinless point particles is reconstructed from the first order formalism of the theory in terms of the triad and the spin connection. The induced symplectic ... More
Gauge invariance, infrared/collinear singularities and tree level matrix element for e+ e- to nu_e bar nu_e gamma gammaJun 04 2004One of the necessary steps in constructing high precision option of KKMC was to install the double bremsstrahlung matrix element for the process e+ e- to nu_e bar nu_e into the scheme of Coherent Exclusive Exponentiation. The process is also interesting ... More
Light-curve analysis of KOI 2700b: the second extrasolar planet with a comet-like tailDec 20 2017The Kepler object KOI 2700b (KIC 8639908b) was discovered recently as the second exoplanet with a comet-like tail. It exhibits a distinctly asymmetric transit profile, likely indicative of the emission of dusty effluents and reminiscent of KIC 12557548b, ... More
The Coherent Crooks EqualityDec 26 2018This chapter reviews an information theoretic approach to deriving quantum fluctuation theorems. When a thermal system is driven from equilibrium, random quantities of work are required or produced: the Crooks equality is a classical fluctuation theorem ... More
Interaction strengths in cuprates from the inelastic neutron-scattering measurementsJun 07 2010Aug 27 2010The $t-U-V-J$ model is used to describe the positions of the experimental peaks associated with commensurate and incommensurate structure of the magnetic susceptibility probed by neutron scattering in cuprate compounds. Assuming that the tight-binding ... More
Linear Structure on Calabi-Yau Moduli SpacesJun 03 1993Jun 10 1993We show that the formal moduli space of a Calabi-Yau manifold $X^n$ carries a linear structure, as predicted by mirror symmetry. This linear structure is canonically associated to a splitting of the Hodge filtration on $H^n(X)$.
On Classical Solutions to the Mean Field Game System of ControlsApr 25 2019In this paper, we consider a class of mean field games in which the optimal strategy of a representative agent depends on the statistical distribution of the states and controls. We prove some existence results for the forward-backward system of PDEs ... More
Vertical Cohomologies and Their Application to Completely Integrable Hamiltonian SystemsFeb 10 2002Some functorial and topological properties of vertical cohomologies and their application to completely integrable Hamiltonian systems are studied.
Ellipsoid characterization theoremsMay 17 2011Aug 20 2011In this note we prove two ellipsoid characterization theorems. The first one is that if $K$ is a convex body in a normed space with unit ball $M$, and for any point $p \notin K$ and in any 2-dimensional plane $P$ intersecting $\inter K$ and containing ... More
A Scheduling Model of Battery-powered Embedded SystemApr 24 2015Fundamental theory on battery-powered cyber-physical systems (CPS) calls for dynamic models that are able to describe and predict the status of processors and batteries at any given time. We believe that the idealized system of single processor powered ... More
Screening the Coulomb interaction and thermalization of Anderson insulatorsAug 18 2019Long range interactions are relevant for a wide range of phenomena in physics where they often present a challenge to theory. In condensed matter, the interplay of Coulomb interaction and disorder remains largely an unsolved problem. In two dimensional ... More
Partial topological Zak phase and dynamical confinement in non-Hermitian bipartite systemAug 18 2018Unlike a Chern number in $2$D and $3$D topological system, Zak phase takes a subtle role to characterize the topological phase in $1$D. On the one hand, it is not a gauge invariant, on the other hand, the Zak phase difference between two quantum phases ... More
Top and Bottom Squarks Decays under Cosmological BoundsDec 17 2006We investigate the fermionic decays of top squarks tilde t_{1,2} and bottom squarks tilde b_{1,2}$ in the Minimal Supersymmetric Standard Model with complex parameters M_1, mu, A_t and A_b . In the analysis we particularly take into account the cosmological ... More
Microscopic description of triaxiality in Ru isotopes with covariant energy density functional theoryMar 21 2018The triaxiality in nuclear low-lying states has attracted great interests for many years. Recently, the reduced transition probabilities for levels near the ground state in $^{110}$Ru have been measured and provided strong evidences for a triaxial shape ... More
Word Equations I: Pairs and their Makanin-Razborov DiagramsJul 19 2016This paper is the first in a sequence on the structure of sets of solutions to systems of equations over a free semigroup. To describe the structure, we present a Makanin-Razborov diagram that encodes the set of solutions to such system of equations. ... More
The XXC ModelsDec 11 1997A class of recently introduced multi-states XX models is generalized to include a deformation parameter. This corresponds to an additional nearest-neighbor CC interaction in the defining quadratic hamiltonian. Complete integrability of the one-dimensional ... More
The su(N) Hubbard modelSep 23 1997Dec 22 1997The one-dimensional Hubbard model is known to possess an extended su(2) symmetry and to be integrable. I introduce an integrable model with an extended su(n) symmetry. This model contains the usual su(2) Hubbard model and has a set of features that makes ... More
From scattering amplitudes to cross sections in QCDMar 06 1996I describe how to calculate cross sections for hard-scattering processes in high energy collisions at next to leading order in QCD. I consider infrared-safe quantities and I assume that the scattering amplitudes are known in analytic form up to next-to-leading ... More
Coexistence of Electron-Glass Phase and Persistent Photoconductivity in GeSbTe CompoundsJan 06 2015Mar 24 2015It is demonstrated that persistent-photoconductivity (PPC), well-studied in lightly-doped semiconductors, is observable in GeSbTe compounds using infrared excitation at cryogenic temperatures. The low level of energy-flux necessary to induce an appreciable ... More