Nonminimal Inflation and the Running Spectral Index

Details Nonminimal Inflation and the Running Spectral Index Nonminimal Inflation and the Running Spectral Index

2006-07-24

arxiv.org/abs/astro-ph/0607525v1

JCAP 0610 (2006) 003

Astronomy and Astrophysics

Astrophysics

9 pages, harvmac

Scientific paper

10.1088/1475-7516/2006/10/003

We study a class of models in which the inflaton is minimally coupled to gravity with a term $f(R)\vp^2$. We focus in particular on the case when $f\sim R^2$, the expansion of the scale factor is driven by the usual potential energy, while the rolling of the inflaton is driven by the nonminial coupling. We show that the power spectrum is in general blue, and the problem of getting a running spectral index is eased. However, the inflaton potential must have a large second derivative in order to get a large running.

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