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Search Results: 1 - 10 of 406593 matches for " T. S. Biro "
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Initial State of Disoriented Chiral Condensate Formation
T. S. Biro
Physics , 1996,
Abstract: It is unlikely to reach at high temperatures the state which is used as the starting point of DCC formation in the quenched approximation. The chiral symmetry is restored in the linear sigma model by Goldstone modes (pions), because such isospin-p-wave states carry more entropy. In this paper we estimate this effect of isospin-angular motion in the mean field approximation assuming equipartition of the energy.
Abstract composition rule for relativistic kinetic energy in the thermodynamical limit
T. S. Biro
Physics , 2008, DOI: 10.1209/0295-5075/84/56003
Abstract: We demonstrate by simple mathematical considerations that a power-law tailed distribution in the kinetic energy of relativistic particles can be a limiting distribution seen in relativistic heavy ion experiments. We prove that the infinite repetition of an arbitrary composition rule on an infinitesimal amount leads to a rule with a formal logarithm. As a consequence the stationary distribution of energy in the thermodynamical limit follows the composed function of the Boltzmann-Gibbs exponential with this formal logarithm. In particular, interactions described as solely functions of the relative four-momentum squared lead to kinetic energy distributions of the Tsallis-Pareto (cut power-law) form in the high energy limit.
Introduction to statistical models and non-extensive statistics
T. S. Biro
Physics , 2005,
Abstract: Quark matter is being expected to be found in heavy ion collisions on the basis of calculations in the framework of traditional, extensive thermodynamics. Recently a non-extensive generalization of the thermodynamics is emerging in the theoretical research. We review here some basic concepts in statistics, kinetic theory and thermodynamics, in particular those encountered in non-extensive thermodynamics. This offers an introduction into the theoretical basis of considering non-extensive parton kinetics for describing the hadronization of quark matter.
Chaotic Dynamics of SU(2) Gauge Fields in the Presence of Static Charges
T. S. Biro
Physics , 1995, DOI: 10.1016/0960-0779(95)00121-2
Abstract: We have found in numerical simulations that the chaoticity of the classical hamiltonian lattice SU(2) gauge theory is reduced in the presence of static charges at the same total energy. The transition from strongly to weakly chaotic behavior is rather sudden at a critical charge strength.
Quark Coalescence and Hadronic Equilibrium
T. S. Biro
Physics , 2000,
Abstract: In a simplified model we study how close can the result of a fast, non-equilibrium hadronization of quark matter in an expanding fireball come to hadronic composition in equilibrium. We present a chemical approach to the simple A+B --> C quark fusion, showing ideal equilibrium constrained by conservation laws, the fugacity parametrization, as well as linear and non-linear quark coalescence models as different approximations to this chemistry. It is shown that color confinement requires a quark density dependent hadronization cross section.
Non-extensive equilibration in relativistic matter
Biro, T. S.;Purcsel, G.
High Energy Physics - Phenomenology , 2008, DOI: 10.2478/s11534-009-0004-1
Abstract: We present a view of the non-extensive thermodynamics based on general composition rules. A formal logarithm maps these rules to the addition, which can be used to generate stationary distributions by standard techniques. We review the most commonly used rules and as an application we discuss the Tsallis-Pareto distribution of transverse momenta of energetic hadrons, which emerge from relativistic heavy-ion collisions.
Pions and kaons from stringy quark matter
Biro, T. S.;Urmossy, K.
High Energy Physics - Phenomenology , 2008, DOI: 10.1088/0954-3899/36/6/064044
Abstract: Different hadron transverse momentum spectra are calculated in a non-extensive statistical, quark-coalescence model. For the low-pT part a gluonic string contribution is conjectured, its length distribution and fractality are fitted to RHIC data.
Microscopic Origin of Non-Gaussian Distributions of Financial Returns
T. S. Biro,R. Rosenfeld
Physics , 2007, DOI: 10.1016/j.physa.2007.10.067
Abstract: In this paper we study the possible microscopic origin of heavy-tailed probability density distributions for the price variation of financial instruments. We extend the standard log-normal process to include another random component in the so-called stochastic volatility models. We study these models under an assumption, akin to the Born-Oppenheimer approximation, in which the volatility has already relaxed to its equilibrium distribution and acts as a background to the evolution of the price process. In this approximation, we show that all models of stochastic volatility should exhibit a scaling relation in the time lag of zero-drift modified log-returns. We verify that the Dow-Jones Industrial Average index indeed follows this scaling. We then focus on two popular stochastic volatility models, the Heston and Hull-White models. In particular, we show that in the Hull-White model the resulting probability distribution of log-returns in this approximation corresponds to the Tsallis (t-Student) distribution. The Tsallis parameters are given in terms of the microscopic stochastic volatility model. Finally, we show that the log-returns for 30 years Dow Jones index data is well fitted by a Tsallis distribution, obtaining the relevant parameters.
A new effective Lagrangian for nuclear matter
T. S. Biro,J. Zimanyi
Physics , 1996, DOI: 10.1016/S0370-2693(96)01433-5
Abstract: The relativistic mean field model, the Zim\'anyi - Moszkowski (ZM) Lagrangian describes nuclear matter and stable finite nuclei even in the non-relativistic limit. It fails, however, to predict the correct non-relativistic spin-orbit (SO) coupling. In this paper we improve on this matter by an additional tensor coupling analogous to the anomalous gyromagnetic ratio. It can be adjusted to describe the SO-term without changing the mean field solution of the ZM-Lagrangian for nuclear matter.
Exotic Heavy Baryons at LHC?
T. S. Biro,J. Zimanyi
Physics , 1993,
Abstract: We speculate about a heavy bottom-charm six-quark baryon. A semiclassical and a gaussian estimate reveal that the octet-octet bbb-ccc configuration can be energetically favored with respect to the singlet-singlet one. This result suggests that a confined bbb-ccc six-quark state may exist. Such objects may be produced in appreciable amount in heavy ion collisions at LHC energies.
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