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Boubekeur L.,University of Valencia | Boubekeur L.,University Of Constantine Iconstantine | Giusarma E.,University of Rome La Sapienza | Mena O.,University of Valencia | Ramirez H.,University of Valencia
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2015

We examine the impact of a nonminimal coupling of the inflaton to the Ricci scalar, 12ξRξ2, 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∝φ2, using the latest combined 2015 analysis of Planck and the BICEP2/Keck Array. We find that the presence of a coupling ξ is favored at a significance of 99% C.L., assuming that nature has chosen the potential V∝φ2 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 ξ is different from zero at the 2σ 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. © 2015 American Physical Society. Source

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