Irreversible Matter Creation in Inflationary Cosmology

Authors: Harko, T.1; Mak, M.K.2

Source: Astrophysics and Space Science, Volume 253, Number 1, 1997 , pp. 161-175(15)

Publisher: Springer

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Abstract:

Irreversible matter creation is investigated in a two-component (scalar field and ordinary matter) cosmological fluid in a homogeneous spatially flat and isotropic Friedmann-Robertson-Walker (FRW) inflationary Universe during its reheating era. The thermodynamics of open systems as applied together with the gravitational field equations to the two-component cosmological fluid leads to a generalisation of the elementary reheating theory in which the decay (creation) pressures are explicitly considered as parts of the fluid stress-energy tensor. Particular models describing coherently oscillating scalar waves and leading to a high particle production at the beginning of the oscillatory period are considered too.

Document Type: Regular Paper

Affiliations: 1: Oncological Institute, 3400 Cluj-Napoca, Romania 2: Physics Department, University of Hong Kong, Pokfulam, Hong Kong

Publication date: January 1, 1997

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