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Current cosmological bounds on neutrino masses and relativistic relics

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Current cosmological bounds on neutrino masses and relativistic relics

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dc.contributor.author Crotty, Patrick
dc.contributor.author Lesgourgues, Julien
dc.contributor.author Pastor Carpi, Sergio
dc.date.accessioned 2014-07-31T11:11:21Z
dc.date.available 2014-07-31T11:11:21Z
dc.date.issued 2004
dc.identifier.citation Crotty, Patrick Lesgourgues, Julien Pastor Carpi, Sergio 2004 Current cosmological bounds on neutrino masses and relativistic relics Physical Review D 69 123007-1 123007-10
dc.identifier.uri http://hdl.handle.net/10550/37344
dc.description.abstract We combine the most recent observations of large-scale structure (2dF and SDSS galaxy surveys) and cosmic microwave anisotropies (WMAP and ACBAR) to put constraints on flat cosmological models where the number of massive neutrinos and of massless relativistic relics are both left arbitrary. We discuss the impact of each dataset and of various priors on our bounds. For the standard case of three thermalized neutrinos, we find an upper bound on the total neutrino mass sum mnu < 1.0 (resp. 0.6) eV (at 2-sigma), using only CMB and LSS data (resp. including priors from supernovae data and the HST Key Project), a bound that is quite insensitive to the splitting of the total mass between the three species. When the total number of neutrinos or relativistic relics Neff is left free, the upper bound on sum mnu (at 2-sigma, including all priors) ranges from 1.0 to 1.5 eV depending on the mass splitting. We provide an explanation of the parameter degeneracy that allows larger values of the masses when Neff increases. Finally, we show that the limit on the total neutrino mass is not significantly modified in the presence of primordial gravitational waves, because current data provide a clear distinction between the corresponding effects.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2004, vol. 69, p. 123007-1-123007-10
dc.subject Física
dc.title Current cosmological bounds on neutrino masses and relativistic relics
dc.type journal article es_ES
dc.date.updated 2014-07-31T11:11:22Z
dc.identifier.doi 10.1103/PhysRevD.69.123007
dc.identifier.idgrec 018316
dc.rights.accessRights open access es_ES

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