Bulk viscosity of a gas of massless pions
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Chen-2009-Bulk viscosity of a.pdf
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Author(s)
Chen, Jiunn-Wei
Wang, Juven
Date Issued
April 2009
Journal
Physical Review C
Publisher
American Physical Society
Citation
Chen, Jiunn-Wei, and Juven Wang. “Bulk Viscosity of a Gas of Massless Pions.” Physical Review C 79.4 (2009) : 044913. © 2009 The American Physical Society
Version
Final published version
Abstract
In the hadronic phase, the dominant configuration of quantum chromodynamics (QCD) with two flavors of massless quarks is a gas of massless pions. We calculate the bulk viscosity (ζ) using the Boltzmann equation with the kinetic theory generalized to incorporate the trace anomaly. We find that the dimensionless ratio ζ/s, s being the entropy density, is monotonic increasing below T=120 MeV, where chiral perturbation theory is applicable. This, combined with previous results, shows that ζ/s reaches its maximum near the phase-transition temperature Tc, while η/s, η being the shear viscosity, reaches its minimum near Tc in QCD with massless quarks.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.79.044913
