We investigate general frameworks for calculating transport coefficients for quasiparticle theories at finite temperature. Hadronic transport coefficients are then computed using the linear $\sigma$ model (LSM). The bulk viscosity over entropy density ($\zeta /s$) is evaluated in the relaxation time approximation (RTA) and the specific shear viscosity ($\eta /s$) and static electrical conductivity (${\sigma }_{\mathrm{el}}/T$) are both obtained in the RTA and using a functional variational approach. Results are shown for different values of the scalar-isoscalar hadron vacuum mass with in-medium masses for the interacting fields. The advantages and limitations of the LSM for studies of strongly interacting matter out of equilibrium are discussed and results are compared with others in the literature.

• Received 15 June 2020
• Accepted 28 August 2020

DOI:https://doi.org/10.1103/PhysRevC.102.034906

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Published by the American Physical Society