Cosmological parameter estimation with the Planck satellite data : from the construction of a likelihood to neutrino properties

Abstract : The cosmic microwave background (CMB), relic of the hot Big-Bang, carries the traces of both the rich structure formation of the late time epochs and the energetic early phases of the universe.The Planck satellite provided, from 2009 to 2013, high-quality measurements of the anisotropies of the CMB. These are used in this thesis to determine the parameters of the standard cosmological model and of the extension concerning the neutrino sector. The construction of an high-l Planck likelihood is detailed. This involves a masking strategy that deals in particular with the contamination from thermal emission of the Galaxy. The residual foregrounds are treated directly at the power spectrum level relying on physically motivated templates based on Planck studies.The statistical methods needed to extract the cosmological parameters in the comparison between models and data are described, both the Bayesian Monte Carlo Markov Chain techniques and the frequentist profile likelihood. Results on cosmological parameters are presented using Planck data alone and in combination with the small scale data from the ground based CMB experiment ACT and SPT, the Baryon Acoustic Oscillation and the Supernovae. Constraints on the absolute scale of neutrino masses and of the number of effective neutrino are also discussed.
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Submitted on : Thursday, November 12, 2015 - 3:02:20 PM
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Marta Spinelli. Cosmological parameter estimation with the Planck satellite data : from the construction of a likelihood to neutrino properties. Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]. Université Paris Sud - Paris XI, 2015. English. ⟨NNT : 2015PA112241⟩. ⟨tel-01228023⟩

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