Decoherence and entropy of primordial fluctuations II. The entropy budget

Details Decoherence and entropy of primordial fluctuations II. The entropy budget Decoherence and entropy of primordial fluctuations II. The entropy budget

2008-05-05

arxiv.org/abs/0805.0424v1

Phys.Rev.D78:065045,2008

Physics

High Energy Physics

High Energy Physics - Theory

28 pages

Scientific paper

10.1103/PhysRevD.78.065045

We calculate the entropy of adiabatic perturbations associated with a truncation of the hierarchy of Green functions at the first non trivial level, i.e. in a self-consistent Gaussian approximation. We give the equation governing the entropy growth and discuss its phenomenology. It is parameterized by two model-dependent kernels. We then examine two particular inflationary models, one with isocurvature perturbations, the other with corrections due to loops of matter fields. In the first model the entropy grows rapidely, while in the second the state remains pure (at one loop).

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