In this Thesis I discuss several recent results obtained using the CMB spectra measured by Planck and several other cosmological probes. Extensions of the ΛCDM model are studied, including the presence of an additional sterile neutrino (motivated by the short-baseline oscillation anomalies) and of a thermal axion. The degeneracies of the cosmological effects of these particles with the power spectrum of primordial perturbations are tested. We also show that the power spectrum of initial scalar perturbations can be degenerate with the presence of primordial non-Gaussianities, thus affecting the constraints on the non-Gaussianity parameter fNL. Finally, an effective interaction between dark energy and dark matter is studied.
@article{arxiv.1603.09102,
title = {New Developments in Cosmology},
author = {Stefano Gariazzo},
journal= {arXiv preprint arXiv:1603.09102},
year = {2016}
}
Comments
Ph.D. Thesis, succesfully defended on 22/03/2016 at University of Torino. Based on arXiv:1309.3192, arXiv:1404.1794, arXiv:1404.6160 (updated results in Ch. 5), arXiv:1412.7405, arXiv:1503.00911, arXiv:1506.05251, arXiv:1507.08204, arXiv:1601.07557, arXiv:1602.01765