Why hyperbolic theories of dissipation cannot be ignored: Comments on a paper by Kostadt and Liu

Abstract

Contrary to what is asserted in a recent paper by Kostadt and Liu ("Causality and stability of the relativistic diffusion equation"), experiments can tell apart (and in fact do) hyperbolic theories from parabolic theories of dissipation. It is stressed that the existence of a non--negligible relaxation time does not imply for the system to be out of the hydrodynamic regime.

8 pages Latex, to appear in Phys.Rev.D

References in corpus (2)

• On the Causality and Stability of the Relativistic Diffusion Equation
• Hydrodynamics beyond local equilibrium: application to electron gas

Cited by in corpus (14)

• Causal Theories of Dissipative Relativistic Fluid Dynamics for Nuclear Collisions
• Causality and existence of solutions of relativistic viscous fluid dynamics with gravity
• Relativistic Brownian Motion
• Relativistic diffusion processes and random walk models
• Causality of fluid dynamics for high-energy nuclear collisions
• Bulk Viscosity and Relaxation Time of Causal Dissipative Relativistic Fluid Dynamics
• Unified Extended Irreversible Thermodynamics and the stability of relativistic theories for dissipation
• On Hyperbolic "Theories" of Relativistic Dissipative Fluids
• Relativistic viscous effects on the primordial gravitational waves spectrum
• Shear viscosity, Bulk viscosity and Relaxation Times of Causal Dissipative Relativistic Fluid-Dynamics at Finite Temperature and Chemical Potential
• On Extended Thermodynamics: From Classical to the Relativistic Regime
• Fluctuations in Relativistic Causal Hydrodynamics
• Nonlinear Fluctuations in Relativistic Causal Fluids
• Dissipative type theories for Bjorken and Gubser flows