Density Fluctuations in the Oscillatory Phase of Nonclassical Inflaton in FRW Universe

Details Density Fluctuations in the Oscillatory Phase of Nonclassical Inflaton in FRW Universe Density Fluctuations in the Oscillatory Phase of Nonclassical Inflaton in FRW Universe

2007-12-19

arxiv.org/abs/0712.3129v1

Int.J.Mod.Phys.D17:1991-2005,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 2 figures, To appear in Int.J.Mod.Phys.D

Scientific paper

10.1142/S0218271808013662

Using coherent and squeezed state formalisms of quantum optics for a minimally coupled non-classical inflaton in the FRW mertic is studied, in semiclassical theory of gravity. The leading order solution for the semiclassical Einstein equations in the coherent, squeezed and squeezed vacuum states are obtained perturbatively and are exhibit powerlaw expansion behaviour. The validity of the semiclassical theory is examined in the squeezed vacuum state in the oscillatory phase of the inflaton. The semiclassical theory in the oscillatory phase of the non-classical inflaton holds only if the associated squeezing parameter is much less compared to unity. Quantum fluctuations of the inflaton is also examined in coherent and squeezed state formalisms.

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