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

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

2001-02-07

arxiv.org/abs/gr-qc/0102026v1

Phys.Rev. D64 (2001) 088503

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

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

Scientific paper

10.1103/PhysRevD.64.088503

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.

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