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American Physical Society, Physical Review Letters, 16(113), 2014

DOI: 10.1103/physrevlett.113.161303

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Mild Quasilocal Non-Gaussianity as a Signature of Modified Gravity During Inflation

Journal article published in 2014 by Nicola Bartolo, Dario Cannone, Raul Jimenez ORCID, Sabino Matarrese, Licia Verde
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We show that modifications of Einstein gravity during inflation could leave potentially measurable imprints on cosmological observables in the form of non-Gaussian perturbations. This is due to the fact that these modifications appear in the form of an extra field that could have nontrivial interactions with the inflaton. We show it explicitly for the case R + alpha R-2, where nearly scale-invariant non-Gaussianity at the level of f(NL) approximate to -(1 to 30) can be obtained, in a quasilocal configuration.