Stochastic Inflation and Dimensional Reduction

Details Stochastic Inflation and Dimensional Reduction Stochastic Inflation and Dimensional Reduction

2008-05-14

arxiv.org/abs/0805.1998v3

Phys.Rev.D78:103501,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 1 figure; v2: minor changes; v3: revised and extended

Scientific paper

10.1103/PhysRevD.78.103501

We present a replica field-theoretic approach to stochastic inflation in which a manifestation of dimensional reduction is found. The scale above which the latter dominates grows exponentially fast with time and thus affects largest super-horizon scales. We find inevitable modifications of the spectral index on those scales. An explicit relation between the noise correlator and the non-gaussianity parameter f_NL is found.

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