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Decoherence due to the Horizon after Inflation · Around

2007

Decoherence due to the Horizon after Inflation

Sharman, Jonathan W., Moore, Guy D.

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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.

Built on

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Similar

M. Srednicki, Phys. Rev. Lett. 71
1993
Cited alongside, same era.
A. Albrecht, P. Ferreira, M. Joyce and T. Prokopec, Phys. Rev. D 50
1994
Cited alongside, same era.
D. Polarski and A. A. Starobinsky, Class. Quant. Grav. 13
1996
Cited alongside, same era.
C. P. Burgess, R. Holman and D. Hoover, arXiv:astro-ph/0601646
Cited in the paper.

Then

J. Lesgourgues, D. Polarski and A. A. Starobinsky, Nucl. Phys. B 497
Original
1997
Later among the works it cites.
R. Bousso, JHEP 9907
1999
Later among the works it cites.
C. Kiefer, I. Lohmar, D. Polarski and A. A. Starobinsky, Class. Quant. Grav. 24
2007
Closest in time.

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