Constraining quantum collapse inflationary models with CMB data

BENETTI, MICOL; LANDAU, SUSANA J.; J.S.ALCANIZ

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2016 vol. 12

1475-7516

The hypothesis of the self-induced collapse of the inflaton wavefunction was proposed as responsible for the emergence of inhomogeneityand anisotropy at all scales. This proposal was studied within an almostde Sitter space-time approximation for the background, which led to aperfect scale-invariant power spectrum, and also for a quasi-de Sitterbackground, which allows to distinguish departures from the standardapproach due to the inclusion of the collapse hypothesis. In this workwe perform a Bayesian model comparison for two different choices of theself-induced collapse in a full quasi-de Sitter expansion scenario. Inparticular, we analyze the possibility of detecting the imprint of thesecollapse schemes at low multipoles of the anisotropy temperature powerspectrum of the Cosmic Microwave Background (CMB) using the most recentdata provided by the Planck Collaboration. Our results show that one ofthe two collapse schemes analyzed provides the same Bayesian evidence ofthe minimal standard cosmological model ΛCDM, while the otherscenario is weakly disfavoured with respect to the standard cosmology.