Bulk viscosity of a pion gas and energy-momentum correlations

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Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 10
Poster Global and collective dynamics


Juan Torres-Rincon (Universidad Complutense de Madrid)


We address the bulk viscosity of a pion gas in kinetic theory. Using Unitarized Chiral Perturbation Theory for the pion interaction we show how elastic collisions control the bulk viscosity at low temperature and physical pion masses. The bulk viscosity vanishes in the limit of zero temperature, in agreement with non-relativistic arguments. The collision integral zero modes (corresponding to particle and energy conservation) are properly taken into account, as is the approximate pion chemical potential. We also propose a way of measuring the bulk viscosity in correlations of the fluctuating part of the stress-energy tensor and show how an estimate can be obtained with data in heavy ion collisions at LHC or FAIR.

Primary author

Juan Torres-Rincon (Universidad Complutense de Madrid)


Dr Antonio Dobado (Universidad Complutense de Madrid) Dr Felipe Llanes-Estrada (Universidad Complutense de Madrid)

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