On the Phase-Space Volume of Primordial Cosmological Perturbations

Details On the Phase-Space Volume of Primordial Cosmological Perturbations On the Phase-Space Volume of Primordial Cosmological Perturbations

1998-06-15

arxiv.org/abs/gr-qc/9806067v1

Class.Quant.Grav. 14 (1997) 881-888

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX (10 pages)

Scientific paper

10.1088/0264-9381/14/4/006

We show how to determine the typical phase space volume $\Gamma$ for primordial gravitational waves produced during an inflationary stage, which is invariant under squeezing. An expression for $\Gamma$ is found in the long wavelength regime. The quasi-classical entropy of a pure vacuum initial state defined as the logarithm of $\Gamma$ modulo a constant remains zero in spite of the generation of fluctuations (creation of real gravitons).

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