Bulk viscosity of low-temperature strongly interacting matter



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Dobado González, Antonio and Llanes Estrada, Felipe José and Torres Rincón, Juan M. (2011) Bulk viscosity of low-temperature strongly interacting matter. Physics Letters B, 72 (1). pp. 43-48. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/S0370269311007143 y http://arxiv.org/abs/1103.0735


We study the bulk viscosity of a pion gas in unitarized Chiral Perturbation Theory at low and moderate temperatures, below any phase transition to a quark-gluon plasma phase. We argue that inelastic processes are irrelevant and exponentially suppressed at low temperatures. Since the system falls out of chemical equilibrium upon expansion, a pion chemical potential must be introduced, so we extend the existing theories that include it. We control the zero modes of the collision operator and Landau's conditions of fit when solving the Boltzmann equation with the elastic collision kernel. The dependence of the bulk viscosity with temperature is reminiscent of the findings of Fernández-Fraile and Gómez Nicola (2009) [1], while the numerical value is closer to that of Davesne (1996) [2]. In the zero-temperature limit we correctly recover the vanishing viscosity associated to a non-relativistic monoatomic gas.

Item Type:Article
Additional Information:

© 2011 Elsevier B.V. Work supported by grants FPA 2008-00592, FIS2008-01323,
FPA2007-29115-E, PR34-1856-BSCH, UCM-BSCH GR58/08 910309,
PR34/07-15875 (Spain). J.M.T.-R. is a recipient of an FPU scholarship.

Uncontrolled Keywords:Bulk Viscosity, Pion Gas, Inverse Amplitude Method, Heavy Ion Collisions, Elastic Pion Scattering
Subjects:Sciences > Physics
ID Code:20446
Deposited On:05 Apr 2013 12:17
Last Modified:07 Jul 2015 08:34

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