TY  - JOUR
AU  - de Salas, P. F.
AU  - Gariazzo, S.
AU  - Lesgourgues, J.
AU  - Pastor, S.
PY  - 2017
DA  - 2017//
TI  - Calculation of the local density of relic neutrinos
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 034
EP  - 24pp
VL  - 09
IS  - 9
PB  - Iop Publishing Ltd
KW  - cosmological neutrinos
KW  - dark matter simulations
KW  - galaxy clustering
KW  - neutrino experiments
AB  - 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.
SN  - 1475-7516
UR  - http://arxiv.org/abs/1706.09850
UR  - https://doi.org/10.1088/1475-7516/2017/09/034
DO  - 10.1088/1475-7516/2017/09/034
LA  - English
N1  - WOS:000411617000002
ID  - deSalas_etal2017
ER  -