Calculation of the local density of relic neutrinos
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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.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.rights.uri info:eu-repo/semantics/openAccess
dc.source 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.subject Cosmologia
dc.subject Astrofísica
dc.title Calculation of the local density of relic neutrinos
dc.type info:eu-repo/semantics/article
dc.date.updated 2017-11-08T11:39:23Z
dc.identifier.doi https://doi.org/10.1088/1475-7516/2017/09/034
dc.identifier.idgrec 120968

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