Massive neutrinos and cosmology |
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Authors: | Julien Lesgourgues Sergio Pastor |
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Affiliation: | 1. Laboratoire de Physique Théorique LAPTH, CNRS-Université de Savoie, B.P. 110, F-74941 Annecy-le-Vieux Cedex, France;2. Instituto de Física Corpuscular, CSIC-Universitat de València, Ed. Institutos de Investigación, Apdo. 22085, E-46071 Valencia, Spain |
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Abstract: | The present experimental results on neutrino flavour oscillations provide evidence for non-zero neutrino masses, but give no hint on their absolute mass scale, which is the target of beta decay and neutrinoless double-beta decay experiments. Crucial complementary information on neutrino masses can be obtained from the analysis of data on cosmological observables, such as the anisotropies of the cosmic microwave background or the distribution of large-scale structure. In this review we describe in detail how free-streaming massive neutrinos affect the evolution of cosmological perturbations. We summarize the current bounds on the sum of neutrino masses that can be derived from various combinations of cosmological data, including the most recent analysis by the WMAP team. We also discuss how future cosmological experiments are expected to be sensitive to neutrino masses well into the sub-eV range. |
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Keywords: | 14.60.Pq 95.35.+d 98.80.Es |
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