Observational tests of inflation with a field derivative coupling to gravity

Details Observational tests of inflation with a field derivative coupling to gravity Observational tests of inflation with a field derivative coupling to gravity

2012-01-28

arxiv.org/abs/1201.5926v2

Phys.Rev.D85:083518,2012

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages, 5 figures

Scientific paper

A field kinetic coupling with the Einstein tensor leads to a gravitationally enhanced friction during inflation, by which even steep potentials with theoretically natural model parameters can drive cosmic acceleration. In the presence of this non-minimal derivative coupling we place observational constraints on a number of representative inflationary models such as chaotic inflation, inflation with exponential potentials, natural inflation, and hybrid inflation. We show that most of the models can be made compatible with the current observational data mainly due to the suppressed tensor-to-scalar ratio.

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