Phys. Rev. D 63, 103507 (2001) [13 pages]Relativistic theories of interacting fields and fluidsReceived 29 December 2000; published 13 April 2001 We investigate divergence-type theories describing the dissipative interaction between a field and a fluid. We look for theories which, under equilibrium conditions, reduce to the theory of a Klein-Gordon scalar field and a perfect fluid. We show that the requirements of causality and positivity of entropy production put nontrivial constraints to the structure of the interaction terms. These theories provide a basis for the phenomonological study of the reheating period. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.103507
DOI:
10.1103/PhysRevD.63.103507
PACS:
98.80.Cq, 47.75.+f, 95.30.Lz
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