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Relativistic second-order dissipative and anisotropic fluid dynamics in the relaxation-time approximation for an ideal gas of massive particles
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In this paper, we study all transport coefficients of second-order dissipative fluid dynamics derived by V. E. Ambrus et al. [Phys. Rev. D 106, 076005 (2022)] from the relativistic Boltzmann equation in the relaxation-time approximation for the collision integral. These transport coefficients are computed for a classical ideal gas of massive particles, with and without taking into account the conservation of intrinsic quantum numbers. Through rigorous comparison between kinetic theory, second-order dissipative fluid dynamics, and leading-order anisotropic fluid dynamics for a (0+1)--dimensional boost-invariant flow scenario, we show that both fluid-dynamical theories describe the early far-from-equilibrium stage of the expansion reasonably well.
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Cited by 2 Pith papers
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Relaxation for massive particles: transport and causality
The paper derives closed-form mass-dependent transport coefficients for massive RTA gases and proposes that the discontinuity across the correlator cut defines an effective lightcone velocity.
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Relativistic dissipative hydrodynamics for particles of arbitrary mass
For a classical gas with constant cross-sections, all first- and second-order dissipative transport coefficients are computed for arbitrary mass, and the non-relativistic limit reproduces Grad's equations.
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