Inflation and squeezed quantum states

Details Inflation and squeezed quantum states Inflation and squeezed quantum states

1993-03-01

arxiv.org/abs/astro-ph/9303001v2

Phys.Rev.D50:4807-4820,1994

Astronomy and Astrophysics

Astrophysics

33 pages, one section added, significant revisions, 6 figures (in uuencoded file), Imperial/TP/92-93/21

Scientific paper

10.1103/PhysRevD.50.4807

The inflationary cosmology is analyzed from the point of view of squeezed quantum states. As noted by Grishchuk and Sidorov, the amplification of quantum fluctuations into macroscopic perturbations which occurs during cosmic inflation is a process of quantum squeezing. We carefully develop the squeezed state formalism and derive the equations that govern the evolution of a gaussian initial state. We derive the power spectrum of density perturbations for a simple inflationary model and discuss its features. We conclude that the squeezed state formalism provides an interesting framework within which to study the amplification process, but,in disagreement with the claims of Grishchuk and Sidorov, that it does {\em not} provide us with any new physical results.

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