Decoherence due to the Horizon after Inflation

Details Decoherence due to the Horizon after Inflation Decoherence due to the Horizon after Inflation

2007-08-24

arxiv.org/abs/0708.3353v1

JCAP0711:020,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages

Scientific paper

10.1088/1475-7516/2007/11/020

The fluctuations in the inflaton field at the end of inflation which seed the density perturbations are prepared in a pure quantum state. It is generally assumed that some physics causes this pure state to decohere so that it should be treated probabilistically. We show that the entanglement entropy between the universe inside our observable horizon and that outside our horizon is sufficient to do this. For the modes which are super-Hubble at the end of inflation, this entanglement entropy grows with volume inside the horizon, rather than with the horizon's area, and is proportional to the number of e-folds since Hubble crossing.

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