Transport coefficients of transient hydrodynamics for the hadron-resonance gas and thermal-mass quasiparticle models
Physical Review D(2024)
摘要
We calculate all transport coefficients of second order transient
hydrodynamics in two effective kinetic theory models: a hadron-resonance gas
and a quasiparticle model with thermal masses tuned to reproduce QCD
thermodynamics. We compare the corresponding results with calculations for an
ultrarelativistic single-component gas, that are widely employed in
hydrodynamic simulations of heavy ion collisions. We find that both of these
effective models display a qualitatively different normalized bulk viscosity,
when compared to the calculation for the single-component gas. Indeed,
ζ/[τ_Π(ε_0 + P_0)] ≃ 16.91(1/3-c_s^2)^2,
for the hadron-resonance gas model, and ζ/[τ_Π(ε_0 +
P_0)] ≃ 5 (1/3-c_s^2) for the quasiparticle model. Differences are
also observed for many second-order transport coefficients, specially those
related to the bulk viscous pressure. The transport coefficients derived are
shown to be consistent with fundamental linear stability and causality
conditions.
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