Primordial fluctuations from nonlinear couplings

Details Primordial fluctuations from nonlinear couplings Primordial fluctuations from nonlinear couplings

1996-08-23

arxiv.org/abs/gr-qc/9608057v2

Phys.Rev. D55 (1997) 1812-1821

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, Revtex, we added an appendix clarifying our assumptions about the initial conditions at the beggining of inflation

Scientific paper

10.1103/PhysRevD.55.1812

We study the spectrum of primordial fluctuations in theories where the inflaton field is coupled to massless fields and/or to itself. Conformally invariant theories generically predict a scale invariant spectrum. Scales entering the theory through infrared divergences cause logarithmic corrections to the spectrum, tiltilng it towards the blue. We discuss in some detail whether these fluctuations are quantum or classical in nature.

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