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Calculation of the local density of relic neutrinos

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Calculation of the local density of relic neutrinos

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dc.contributor.author	Fernández de Salas, Pablo
dc.contributor.author	Gariazzo, Stefano
dc.contributor.author	Pastor Carpi, Sergio
dc.contributor.author	Lesgourgues, Julien
dc.date.accessioned	2017-11-08T11:39:23Z
dc.date.available	2017-11-08T11:39:23Z
dc.date.issued	2017
dc.identifier.citation	Fernández de Salas, Pablo Gariazzo, Stefano Pastor Carpi, Sergio Lesgourgues, Julien 2017 Calculation of the local density of relic neutrinos Journal Of Cosmology And Astroparticle Physics 09 034-1 034-23
dc.identifier.uri	http://hdl.handle.net/10550/62988
dc.description.abstract	Nonzero neutrino masses are required by the existence of flavour oscillations, with values of the order of at least 50 meV. We consider the gravitational clustering of relic neutrinos within the Milky Way, and used the N - one-body simulation technique to compute their density enhancement factor in the neighbourhood of the Earth with respect to the average cosmic density. Compared to previous similar studies, we pushed the simulation down to smaller neutrino masses, and included an improved treatment of the baryonic and dark matter distributions in the Milky Way. Our results are important for future experiments aiming at detecting the cosmic neutrino background, such as the Princeton Tritium Observatory for Light, Early-universe, Massive-neutrino Yield (PTOLEMY) proposal. We calculate the impact of neutrino clustering in the Milky Way on the expected event rate for a PTOLEMY-like experiment. We find that the effect of clustering remains negligible for the minimal normal hierarchy scenario, while it enhances the event rate by 10 to 20% (resp. a factor 1.7 to 2.5) for the minimal inverted hierarchy scenario (resp. a degenerate scenario with 150 meV masses). Finally we compute the impact on the event rate of a possible fourth sterile neutrino with a mass of 1.3 eV.
dc.language.iso	eng
dc.relation.ispartof	Journal Of Cosmology And Astroparticle Physics, 2017, vol. 09, p. 034-1-034-23
dc.subject	Cosmologia
dc.subject	Astrofísica
dc.title	Calculation of the local density of relic neutrinos
dc.type	journal article	es_ES
dc.date.updated	2017-11-08T11:39:23Z
dc.identifier.doi	10.1088/1475-7516/2017/09/034
dc.identifier.idgrec	120968
dc.rights.accessRights	open access	es_ES