Cosmic microwave background and large scale structure constraints on primordial inflation

Abstract

In this work we present preliminary results of cosmological constraints on a class of inflationary models with departures from the nearly-scale-invariant power law spectrum. We combine the Cosmic Microwave Background (CMB) data from the Planck Collaboration with measurements of the galaxy clustering obtained from the eleventh data release of the Sloan Digital Sky Survey (SDSS DR11) to investigate observable signatures of this class of models in the CMB anisotropy and the matter power spectra. In order to discuss the observational viability of such scenarios we also perform a Bayesian comparison with the standard, nearly-scale-invariant power law spectrum model.

Observational assessment of the viability of de Sitter-Gödel-de Sitter phase transition

“…Inflation is the most widely accepted and astonishingly successful scenario to seed the fluctuations which later, through gravitational collapse, form the large-scale structure in the Universe. The observed statistical properties of the inhomogeneities and anisotropies are so far consistent with Gaussian and adiabatic initial conditions with a close to scale-invariant power spectrum, as is predicted by many inflationary scenarios [1,2,3,6,4,5]. However, the rotation of many structures, common to many large scale structures of different sizes, is hardly explained by inflationary initial conditions or by the later growth of structures as prescribed by the standard cosmological perturbation theory [6].…”