Publications (38)

 [Show abstract] [Hide abstract] ABSTRACT: In Denicol et al., Phys. Rev. D 85, 114047 (2012), the equations of motion of relativistic dissipative fluid dynamics were derived from the relativistic Boltzmann equation. These equations contain a multitude of terms of second order in Knudsen number, in inverse Reynolds number, or their product. Terms of second order in Knudsen number give rise to nonhyperbolic (and thus acausal) behavior and must be neglected in (numerical) solutions of relativistic dissipative fluid dynamics. The coefficients of the terms which are of the order of the product of Knudsen and inverse Reynolds numbers have been explicitly computed in the above reference, in the limit of a massless Boltzmann gas. Terms of second order in inverse Reynolds number arise from the collision term in the Boltzmann equation, upon expansion to second order in deviations from the singleparticle distribution function in local thermodynamical equilibrium. In this work, we compute these secondorder terms for a massless Boltzmann gas with constant scattering cross section. Consequently, we assess their relative importance in comparison to the terms which are of the order of the product of Knudsen and inverse Reynolds numbers.
 [Show abstract] [Hide abstract] ABSTRACT: IsraelStewart theory is a causal, stable formulation of relativistic dissipative fluid dynamics. This theory has been shown to give a decent description of the dynamical behavior of a relativistic fluid in cases where shear stress becomes important. In principle, it should also be applicable to situations where heat flow becomes important. However, it has been shown that there are cases where IsraelStewart theory cannot reproduce phenomena associated with heat flow. In this paper, we derive a relativistic dissipative fluiddynamical theory from kinetic theory which provides a good description of all dissipative phenomena, including heat flow. We explicitly demonstrate this by comparing this theory with numerical solutions of the relativistic Boltzmann equation.
 [Show abstract] [Hide abstract] ABSTRACT: We review the traditional derivation of the fluiddynamical equations from kinetic theory according to Israel and Stewart. We show that their procedure to close the fluiddynamical equations of motion is not unique. Their approach contains two approximations, the first being the socalled 14moment approximation to truncate the singleparticle distribution function. The second consists in the choice of equations of motion for the dissipative currents. Israel and Stewart used the second moment of the Boltzmann equation, but this is not the only possible choice. In fact, there are infinitely many moments of the Boltzmann equation which can serve as equations of motion for the dissipative currents. All resulting equations of motion have the same form, but the transport coefficients are different in each case.
 [Show abstract] [Hide abstract] ABSTRACT: Experimental particle spectra can be successfully described by powerlaw tailed energy distributions characteristic to canonical equilibrium distributions associated to R\'enyi's or Tsallis' entropy formula  over a wide range of energies, colliding system sizes, and produced hadron sorts. In order to derive its evolution one needs a corresponding dynamical description of the system which results in such final state observables. The equations of relativistic fluid dynamics are obtained from a nonextensive Boltzmann equation consistent with Tsallis' nonextensive $q$entropy formula. The transport coefficients like shear viscosity, bulk viscosity, and heat conductivity are evaluate based on a linearized collision integral.
 [Show abstract] [Hide abstract] ABSTRACT: The freeze out of the expanding systems, created in relativistic heavy ion collisions, will be discussed. We combine kinetic freeze out equations with Bjorken type system expansion into a unified model. Such a model is a more physical generalization of the earlier simplified nonexpanding freeze out models. We shall see that the basic freeze out features, pointed out in the earlier works, are not smeared out by the expansion.
 [Show abstract] [Hide abstract] ABSTRACT: We study the influence of a temperaturedependent shear viscosity over entropy density ratio $\eta/s$, different shear relaxation times $\tau_\pi$, as well as different initial conditions on the transverse momentum spectra of charged hadrons and identified particles. We investigate the azimuthal flow asymmetries as a function of both collision energy and centrality. The elliptic flow coefficient turns out to be dominated by the hadronic viscosity at RHIC energies. Only at higher collision energies the impact of the viscosity in the QGP phase is visible in the flow asymmetries. Nevertheless, the shear viscosity near the QCD transition region has the largest impact on the collective flow of the system. We also find that the centrality dependence of the elliptic flow is sensitive to the temperature dependence of $\eta/s$.
 [Show abstract] [Hide abstract] ABSTRACT: In this work we present a general derivation of relativistic fluid dynamics from the Boltzmann equation using the method of moments. The main difference between our approach and the traditional 14moment approximation is that we will not close the fluiddynamical equations of motion by truncating the expansion of the distribution function. Instead, we keep all terms in the moment expansion. The reduction of the degrees of freedom is done by identifying the microscopic time scales of the Boltzmann equation and considering only the slowest ones. In addition, the equations of motion for the dissipative quantities are truncated according to a systematic powercounting scheme in Knudsen and inverse Reynolds number. We conclude that the equations of motion can be closed in terms of only 14 dynamical variables, as long as we only keep terms of second order in Knudsen and/or inverse Reynolds number. We show that, even though the equations of motion are closed in terms of these 14 fields, the transport coefficients carry information about all the moments of the distribution function. In this way, we can show that the particlediffusion and shearviscosity coefficients agree with the values given by the ChapmanEnskog expansion.

Article: Sensitivity of the elliptic flow to a temperaturedependent shear viscositytoentropy density ratio
[Show abstract] [Hide abstract] ABSTRACT: We investigate the effects of a temperaturedependent shear viscosity over entropy density ratio η/s, with a minimum near the phase transition, on the elliptic flow of hadrons in ultrarelativistic heavyion collisions at the RHIC and the LHC. We find that the suppression of the elliptic flow in Au+Au collisions at the RHIC is dominated by the viscosity in hadronic matter and in the phase transition region, but insensitive to the viscosity of the quark–gluon plasma (QGP). However, at the highest LHC energy, the elliptic flow becomes sensitive to the shear viscosity of the QGP and insensitive to the hadronic viscosity.  [Show abstract] [Hide abstract] ABSTRACT: We derive equations for fluid dynamics from a nonextensive Boltzmann transport equation consistent with Tsallis' nonextensive entropy formula. We evaluate transport coefficients employing the relaxation time approximation and investigate nonextensive effects in leading order dissipative phenomena at relativistic energies, like heat conductivity, shear and bulk viscosity.
 [Show abstract] [Hide abstract] ABSTRACT: We investigate the influence of a temperaturedependent shear viscosity over entropy density ratio η/s on the transverse momentum spectra and elliptic flow of hadrons in ultrarelativistic heavyion collisions. We find that the elliptic flow in √S(NN)=200 GeV Au+Au collisions at RHIC is dominated by the viscosity in the hadronic phase and in the phase transition region, but largely insensitive to the viscosity of the quarkgluon plasma (QGP). At the highest LHC energy, the elliptic flow becomes sensitive to the QGP viscosity and insensitive to the hadronic viscosity.
 [Show abstract] [Hide abstract] ABSTRACT: We derive the equations of second order dissipative fluid dynamics from the relativistic Boltzmann equation following the method of W. Israel and J. M. Stewart. We present a frame independent calculation of all first and secondorder terms and their coefficients using a linearised collision integral. Therefore, we restore all terms that were previously neglected in the original papers of W. Israel and J. M. Stewart.

Article: Mach Cones in Viscous Matter
[Show abstract] [Hide abstract] ABSTRACT: Employing a microscopic transport model we investigate the evolution of high energetic jets moving through a viscous medium. For the scenario of an unstoppable jet we observe a clearly strong collective behavior for a low dissipative system $\eta/s \approx 0.005$, leading to the observation of conelike structures. Increasing the dissipation of the system to $\eta/s \approx 0.32$ the Mach Cone structure vanishes. Furthermore, we investigate jetassociated particle correlations. A doublepeak structure, as observed in experimental data, is even for lowdissipative systems not supported, because of the large influence of the head shock.  [Show abstract] [Hide abstract] ABSTRACT: We solve the relativistic Riemann problem in viscous matter using the relativistic Boltzmann equation and the relativistic causal dissipative fluiddynamical approach of Israel and Stewart. Comparisons between these two approaches clarify and point out the regime of validity of secondorder fluid dynamics in relativistic shock phenomena. The transition from ideal to viscous shocks is demonstrated by varying the shear viscosity to entropy density ratio $\eta/s$. We also find that a good agreement between these two approaches requires a Knudsen number $Kn < 1/2$. Comment: Version as published in PRC 82, 024910 (2010); 16 pages, 16 figures, typos corrected
 [Show abstract] [Hide abstract] ABSTRACT: To investigate the formation and the propagation of relativistic shock waves in viscous gluon matter we solve the relativistic Riemann problem using a microscopic parton cascade. We demonstrate the transition from ideal to viscous shock waves by varying the shear viscosity to entropy density ratio η/s. We show that an η/s ratio larger than 0.2 prevents the development of welldefined shock waves on time scales typical for ultrarelativistic heavyion collisions. These findings are confirmed by viscous hydrodynamic calculations.
 [Show abstract] [Hide abstract] ABSTRACT: We solve the relativistic Riemann problem in viscous gluon matter employing a microscopic parton cascade. We demonstrate the transition from ideal to viscous shock waves by varying the shear viscosity to entropy density ratio $$\eta${}/s$ from zero to infinity. We show that an $$\eta${}/s$ ratio larger than 0.2 prevents the development of welldefined shock waves on time scales typical for ultrarelativistic heavyion collisions. Comparisons with viscous hydrodynamic calculations confirm our findings.

 [Show abstract] [Hide abstract] ABSTRACT: We present numerical methods to solve the IsraelStewart (IS) equations of causal relativistic dissipative fluid dynamics with bulk and shear viscosities. We then test these methods studying the Riemann problem in (1+1) and (2+1)dimensional geometry. The numerical schemes investigated here are applicable to realistic (3+1)dimensional modeling of a relativistic dissipative fluid. Comment: 21 pages, 4 figures
 [Show abstract] [Hide abstract] ABSTRACT: Quarkyonic matter is a predicted phase between deconfined ideal QGP and Hadronic matter where the dominant degrees of freedom are quarks. Collective flow measurements indicate that the flow developed in QGP, as flow measurements scale with the constituent quark numbers. The possible reasons for the observed constituent quark number scaling were analyzed, arriving to the conclusion that collective flow must have frozen out early when quarks were the dominant constituents of matter.
 [Show abstract] [Hide abstract] ABSTRACT: A novel higher order theory of relaxation of heat and viscosity is proposed based on corrections to the traditional treatment of the relativistic energy density. In the framework of generalized Bjorken scaling solution to accelerating longitudinal flow we point out that the energy flux can be consequently set to zero in the stationary case, independently of the choice of a specific local rest frame, like the LandauLifshitz or Eckart one. We investigate and compare several cooling and reheating scenarios for the Quark Gluon Plasma (QGP) within this approach.
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Institutions

2012

Magyar Tudományos Akadémia Wigner Fizikai Kutatóközpont
Budapeŝto, Budapest, Hungary


20082009

GoetheUniversität Frankfurt am Main
 Frankfurt Institute for Advanced Studies
Frankfurt am Main, Hesse, Germany
