@Article{Boubekeur_etal2015,
author="Boubekeur, L.
and Giusarma, E.
and Mena, O.
and Ramirez, H.",
title="Do current data prefer a nonminimally coupled inflaton?",
journal="Physical Review D",
year="2015",
publisher="Amer Physical Soc",
volume="91",
number="10",
pages="103004--6pp",
abstract="We examine the impact of a nonminimal coupling of the inflaton to the Ricci scalar, 1/2 xi R phi(2), on the inflationary predictions. Such a nonminimal coupling is expected to be present in the inflaton Lagrangian on fairly general grounds. As a case study, we focus on the simplest inflationary model governed by the potential V proportional to phi(2), using the latest combined 2015 analysis of Planck and the BICEP2/Keck Array. We find that the presence of a coupling xi is favored at a significance of 99{\%} C.L., assuming that nature has chosen the potential V proportional to phi(2) to generate the primordial perturbations and a number of e-foldings N = 60. Within the context of the same scenario, we find that the value of xi is different from zero at the 2 sigma level. When considering the cross-correlation polarization spectra from the BICEP2/Keck Array and Planck, a value of r = 0.038(-0.030)(+0.039) is predicted in this particular nonminimally coupled scenario. Future cosmological observations may therefore test these values of r and verify or falsify the nonminimally coupled model explored here.",
optnote="WOS:000354979300001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2237), last updated on Thu, 11 Jun 2015 20:26:39 +0000",
issn="1550-7998",
doi="10.1103/PhysRevD.91.103004",
opturl="http://arxiv.org/abs/1502.05193",
opturl="https://doi.org/10.1103/PhysRevD.91.103004",
archivePrefix="arXiv",
eprint="1502.05193",
language="English"
}