31 July 2018 to 6 August 2018
Maynooth University
Europe/Dublin timezone

Nonequilibrium viscous correction to the phase space density and bulk viscosity in the relaxation time approximation

3 Aug 2018, 14:30
30m
Hall F (Arts Bldg.)

Hall F

Arts Bldg.

Talk D: Deconfinement Deconfinement

Speaker

Alina Czajka (McGill University/Jan Kochanowski University)

Description

We present the correct form of the nonequilibrium viscous correction to the phase space density in the relaxation time approximation that properly takes into account the space-time dependence of the thermal mass. We also investigate the impact the correction has on the bulk viscosity. This correction automatically satisfies the Landau matching condition and energy-momentum conservation. It also makes the appearance of the Callan-Symanzyk $\beta_\lambda$-function natural in the bulk viscosity calculation. The bulk viscosity has the expected parametric form for the Boltzmann gas, while for the Bose-Einstein case, it is affected by the cut-off of infrared divergences. This may be an indication that the relaxation time approximation is too crude to obtain the correct form of the bulk viscosity for quantum gases.

Primary author

Alina Czajka (McGill University/Jan Kochanowski University)

Co-authors

Sigtryggur Hauksson (McGill University) Dr Chun Shen (Brookhaven National Laboratory) Sangyong Jeon (McGill University) Prof. Charles Gale (McGill University)

Presentation Materials