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Search Results: 1 - 10 of 473798 matches for " Máté Nagy "
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Multi-boson correlations using wave-packets II
M. I. Nagy,T. Csorgo
Physics , 2007, DOI: 10.1140/epjst/e2008-00595-0
Abstract: We investigate the analytically solvable pion-laser model, and its generalization to arbitrary multiplicity distributions. Although this kind of extension of the model is possible, the pion laser model in its original form is unique: it is the only model in its class that has an analytic solution.
New exact solutions of relativistic hydrodynamics
T. Csorgo,M. I. Nagy,M. Csanad
Physics , 2008, DOI: 10.1088/0954-3899/35/10/104128
Abstract: A new class of simple and exact solutions of relativistic hydrodynamics is presented, and the consequences are explored in data analysis. The effects of longitudinal work and acceleration are taken into account in an advanced estimate of the initial energy density and the life-time of the reaction.
Similar final states from different initial states using new exact solutions of relativistic hydrodynamics
M. Csanad,M. I. Nagy,T. Csorgo
Physics , 2007, DOI: 10.1140/epjst/e2008-00585-2
Abstract: We present exact, analytic and simple solutions of relativistic perfect fluid hydrodynamics. The solutions allow us to calculate the rapidity distribution of the particles produced at the freeze-out, and fit them to the measured rapidity distribution data. We also give an advanced estimation of the energy density reached in heavy ion collisions, and an improved estimation of the life-time of the reaction.
Anomalous diffusion of pions at RHIC
M. Csanad,T. Csorgo,M. Nagy
Physics , 2007, DOI: 10.1590/S0103-97332007000600018
Abstract: After pointing out the difference between normal and anomalous diffusion, we consider a hadron resonance cascade (HRC) model simulation for particle emission at RHIC and point out, that rescattering in an expanding hadron resonance gas leads to a heavy tail in the source distribution. The results are compared to recent PHENIX measurements of the tail of the particle emitting source in Au+Au collisions at RHIC. In this context, we show, how can one distinguish experimentally the anomalous diffusion of hadrons from a second order QCD phase transition.
Accelerating Solutions of Perfect Fluid Hydrodynamics for Initial Energy Density and Life-Time Measurements in Heavy Ion Collisions
T. Csorgo,M. I. Nagy,M. Csanad
Physics , 2007, DOI: 10.1590/S0103-97332007000500012
Abstract: A new class of accelerating, exact, explicit and simple solutions of relativistic hydrodynamics is presented. Since these new solutions yield a finite rapidity distribution, they lead to an advanced estimate of the initial energy density and life-time of high energy heavy ion reactions. Accelerating solutions are also given for spherical expansions in arbitrary number of spatial dimensions.
Detailed description of accelerating, simple solutions of relativistic perfect fluid hydrodynamics
M. I. Nagy,T. Csorgo,M. Csanad
Physics , 2007, DOI: 10.1103/PhysRevC.77.024908
Abstract: In this paper we describe in full details a new family of recently found exact solutions of relativistic, perfect fluid dynamics. With an ansatz, which generalizes the well-known Hwa-Bjorken solution, we obtain a wide class of new exact, explicit and simple solutions, which have a remarkable advantage as compared to presently known exact and explicit solutions: they do not lack acceleration. They can be utilized for the description of the evolution of the matter created in high energy heavy ion collisions. Because these solutions are accelerating, they provide a more realistic picture than the well-known Hwa-Bjorken solution, and give more insight into the dynamics of the matter. We exploit this by giving an advanced simple estimation of the initial energy density of the produced matter in high energy collisions, which takes acceleration effects (i.e. the work done by the pressure and the modified change of the volume elements) into account. We also give an advanced estimation of the life-time of the reaction. Our new solutions can also be used to test numerical hydrodynamical codes reliably. In the end, we also give an exact, 1+1 dimensional, relativistic hydrodynamical solution, where the initial pressure and velocity profile is arbitrary, and we show that this general solution is stable for perturbations.
A New Family of Simple Solutions of Perfect Fluid Hydrodynamics
T. Csorgo,M. I. Nagy,M. Csanad
Physics , 2006, DOI: 10.1016/j.physletb.2008.04.038
Abstract: A new class of accelerating, exact and explicit solutions of relativistic hydrodynamics is found - more than 50 years after the previous similar result, the Landau-Khalatnikov solution. Surprisingly, the new solutions have a simple form, that generalizes the renowned, but accelerationless, Hwa-Bjorken solution. These new solutions take into account the work done by the fluid elements on each other, and work not only in one temporal and one spatial dimensions, but also in arbitrary number of spatial dimensions. They are applied here for an advanced estimation of initial energy density and life-time of the reaction in ultra-relativistic heavy ion collisions.
A new family of exact and rotating solutions of fireball hydrodynamics
T. Cs?rg?,M. I. Nagy
Physics , 2013, DOI: 10.1103/PhysRevC.89.044901
Abstract: A new class of analytic, exact, rotating, self-similar and surprisingly simple solutions of non-relativistic hydrodynamics are presented for a three-dimensionally expanding, spheroidally symmetric fireball. These results generalize earlier, non-rotating solutions for ellipsoidally symmetric fireballs with directional, three-dimensional Hubble flows. The solutions are presented for a general class of equations of state that includes the lattice QCD equations of state and may feature inhomogeneous temperature and corresponding density profiles.
Permeability and conductivity of platelet-reinforced membranes and composites
T. F. Nagy,P. M. Duxbury
Physics , 2001, DOI: 10.1103/PhysRevE.66.020802
Abstract: We present large scale simulations of the diffusion constant $D$ of a random composite consisting of aligned platelets with aspect ratio $a/b>>1$ in a matrix (with diffusion constant $D_0$) and find that $D/D_0 = 1/(1+ c_1 x + c_2 x^2)$, where $x= a v_f/b$ and $v_f$ is the platelet volume fraction. We demonstrate that for large aspect ratio platelets the pair term ($x^2$) dominates suggesting large property enhancements for these materials. However a small amount of face-to-face ordering of the platelets markedly degrades the efficiency of platelet reinforcement.
An analytic hydrodynamical model of rotating 3D expansion in heavy-ion collisions
M. I. Nagy,T. Cs?rg?
Physics , 2015,
Abstract: A new exact and analytic solution of non-relativistic fireball hydrodynamics is presented. It describes an expanding triaxial ellipsoid that rotates around one of its principal axes. The observables are calculated using simple analytic formulas. Azimuthal oscillation of the off-diagonal Bertsch-Pratt radii of Bose-Einstein correlations as well as rapidity dependent directed and third flow measurements provide means to determine the magnitude of the rotation of the fireball. Observing this rotation and its dependence on collision energy may lead to new information on the equation of state of the strongly interacting quark gluon plasma produced in high energy heavy ion collisions.
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