title: Mild quasilocal non-Gaussianity as a signature of modified gravity during inflation.
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+αR(2), where nearly scale-invariant non-Gaussianity at the level of f(NL) ≈ - (1 to 30) can be obtained, in a quasilocal configuration.
authors.affiliation: Dipartimento di Fisica e Astronomia G. Galilei, Università degli Studi di Padova, I-35131 Padova, Italy and INFN, Sezione di Padova, I-35131 Padova, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Bartolo
authors.affiliation: Dipartimento di Fisica e Astronomia G. Galilei, Università degli Studi di Padova, I-35131 Padova, Italy and INFN, Sezione di Padova, I-35131 Padova, Italy.
authors.forename: Dario
authors.initials: D
authors.lastname: Cannone
authors.affiliation: ICREA & ICC, University of Barcelona, Marti i Franques 1, Barcelona 08028, Spain and Institute for Applied Computational Science, Harvard University, Massachusetts 02138, USA.
authors.forename: Raul
authors.initials: R
authors.lastname: Jimenez
authors.affiliation: Dipartimento di Fisica e Astronomia G. Galilei, Università degli Studi di Padova, I-35131 Padova, Italy and INFN, Sezione di Padova, I-35131 Padova, Italy and Gran Sasso Science Institute (INFN), viale F. Crispi 7, 67100 L'Aquila, Italy.
authors.forename: Sabino
authors.initials: S
authors.lastname: Matarrese
authors.affiliation: ICREA & ICC, University of Barcelona, Marti i Franques 1, Barcelona 08028, Spain and Institute of Theoretical Astrophysics, University of Oslo, 0315 Oslo, Norway.
authors.forename: Licia
authors.initials: L
authors.lastname: Verde