Gravitational Clustering of Cosmic Relic Neutrinos in the Milky Way [CEA]

http://arxiv.org/abs/1712.01153


The standard model of cosmology predicts the existence of cosmic neutrino background in the present Universe. Were we plan to detect relic neutrinos in the vicinity of the Earth, as proposed in the upcoming PTOLEMY experiment, it would be necessary to evaluate the gravitational clustering effects on cosmic relic neutrinos in the Milky Way. In this work we introduce a reweighting technique in the $N$-one-body simulation method, so that a single run of simulation can yield neutrino density profiles for a variety of neutrino masses and different phase space distributions. In light of current experimental results that favor small neutrino masses ($\lesssim 0.1~\mathrm{eV}$), the number density contrast of relic neutrinos around the Earth is found to be almost inversely proportional to the square of neutrino mass. The density contrast–mass relation and the reweighting technique simplify the investigation on the gravitational clustering of relic neutrinos, and thus are useful for the future detection of cosmic neutrino background.

Read this paper on arXiv…

J. Zhang and X. Zhang
Tue, 5 Dec 17
62/96

Comments: 13 pages, 3 figures