https://doi.org/10.1140/epja/s10050-020-00074-3
Regular Article –Theoretical Physics
Viscous coefficients and thermal conductivity of a
gas mixture in the medium
1
Department of Physics, Kazi Nazrul University, Asansol, West Bengal, 713340, India
2
Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Calcutta, 700064, India
3
Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta, 700064, India
4
Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, 400085, India
* e-mail: snigdha.physics@gmail.com
** e-mail: snigdha.ghosh@saha.ac.in
Received:
7
August
2019
Accepted:
15
January
2020
Published online:
9
March
2020
The temperature and density dependence of the relaxation times, thermal conductivity, shear viscosity and bulk viscosity for a hot and dense gas consisting of pions, kaons and nucleons have been evaluated in the kinetic theory approach. The in-medium cross-sections for ,
and
scatterings were obtained by using complete propagators for the exchanged
,
,
and
excitations derived using thermal field theoretic techniques. Notable deviations can be observed in the temperature dependence of
,
and
when compared with corresponding calculations using vacuum cross-sections usually employed in the literature. The value of the specific shear viscosity
is found to be in agreement with available estimates.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020