Observational Signatures of Gravitational Couplings in DBI Inflation

Details Observational Signatures of Gravitational Couplings in DBI Inflation Observational Signatures of Gravitational Couplings in DBI Inflation

2009-10-07

arxiv.org/abs/0910.1353v2

Phys.Rev.D81:023512,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Minor revisions and references added. Version to appear in PRD

Scientific paper

10.1103/PhysRevD.81.023512

In scalar-tensor theories the scalar fields generically couple nontrivially to gravity. We study the observable properties of inflationary models with non-minimally coupled inflaton and Dirac-Born-Infeld (DBI) kinetic term. Within the assumptions of the priors of our Monte-Carlo simulations we find these models can generate new interesting observable signatures. Our discussion focuses on string theory inspired phenomenological models of relativistic D-brane inflation. While successful string theory constructions of ultra-violet DBI brane inflation remain elusive, we show that in suitable regions of the parameter space it is possible to use cosmological observables to probe the non-minimial coupling. Fortunately, the most observationally promising range of parameters include models yielding intermediate levels of non-gaussianity in the range consistent with WMAP 5-year data, and to be constrained further by the Planck satellite.

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