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Do observations prove that cosmological neutrinos are thermally distributed?

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Do observations prove that cosmological neutrinos are thermally distributed?

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dc.contributor.author Cuoco, Alessandro
dc.contributor.author Lesgourgues, Julien
dc.contributor.author Mangano, Gianpiero
dc.contributor.author Pastor Carpi, Sergio
dc.date.accessioned 2014-07-31T11:21:25Z
dc.date.available 2014-07-31T11:21:25Z
dc.date.issued 2005
dc.identifier.citation Cuoco, Alessandro Lesgourgues, Julien Mangano, Gianpiero Pastor Carpi, Sergio 2005 Do observations prove that cosmological neutrinos are thermally distributed? Physical Review D 71 123501-1 123501-12
dc.identifier.uri http://hdl.handle.net/10550/37346
dc.description.abstract It is usually assumed that relic neutrinos possess a Fermi-Dirac distribution, acquired during thermal equilibrium in the Early Universe. However, various mechanisms could introduce strong distortions in this distribution. We perform a Bayesian likelihood analysis including the first moments of the three active neutrino distributions as free parameters, and show that current cosmological observations of light element abundances, Cosmic Microwave Background (CMB) anisotropies and Large Scale Structures (LSS) are compatible with very large deviations from the standard picture. We also calculate the bounds on non-thermal distortions which can be expected from future observations, and stress that CMB and LSS data alone will not be sensitive enough in order to distinguish between non-thermal distortions in the neutrino sector and extra relativistic degrees of freedom. This degeneracy could be removed by additional constraints from primordial nucleosynthesis or independent neutrino mass scale measurements.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2005, vol. 71, p. 123501-1-123501-12
dc.subject Física
dc.title Do observations prove that cosmological neutrinos are thermally distributed?
dc.type journal article es_ES
dc.date.updated 2014-07-31T11:21:25Z
dc.identifier.doi 10.1103/PhysRevD.71.123501
dc.identifier.idgrec 025744
dc.rights.accessRights open access es_ES

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