Bulk viscosity and the conformal anomaly in the pion gas



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Fernández Fraile, Daniel and Gómez Nicola, Ángel (2009) Bulk viscosity and the conformal anomaly in the pion gas. Physical review letters, 102 (12). ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.102.121601


We calculate the bulk viscosity of the massive pion gas within unitarized chiral perturbation theory. We obtain a low-temperature peak arising from explicit conformal breaking due to the pion mass and another peak near the critical temperature, dominated by the conformal anomaly through gluon condensate terms. The correlation between bulk viscosity and conformal breaking supports a recent QCD proposal. We discuss the role of resonances, heavier states, and large-N(c) counting.

Item Type:Article
Additional Information:

© 2009 The American Physical Soci.
We are grateful to D. Kharzeev, G. D. Moore, and C. Pica for very useful comments. This research was partially funded by research contracts No. FPA2004-02602, No. FPA2005-02327, No. FPA2007-29115-E, No. PR34- 1856-BSCH, No. UCM-CAM 10309, and No. FPI-BES- 2005-6726.

Uncontrolled Keywords:Chiral perturbation-theory; Heavy-ion collisions; Transport-coefficients; Field-theory; Phase-transition; Qcd; Temperature; Matter; Quark; Trace
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Mathematical physics
ID Code:30333
Deposited On:25 May 2015 07:58
Last Modified:10 Dec 2018 15:09

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