Speaker
Juan Torres-Rincon
(Universidad Complutense de Madrid)
Description
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)
Co-authors
Dr
Antonio Dobado
(Universidad Complutense de Madrid)
Dr
Felipe Llanes-Estrada
(Universidad Complutense de Madrid)
