Gravitational clustering of cosmic relic neutrinos in the Milky Way
  The standard model of cosmology predicts the existence of cosmic neutrino
background in the present Universe. To detect cosmic relic neutrinos in the
vicinity of the Earth, it is necessary to evaluate the gravitational clustering
effects on relic neutrinos in the Milky Way. Here we introduce a reweighting
technique in the N-one-body simulation method, so that a single simulation can
yield neutrino density profiles for different neutrino masses and phase space
distributions. In light of current experimental results that favor small
neutrino masses, the neutrino number density contrast around the Earth is found
to be almost proportional to the square of neutrino mass. The density
contrast-mass relation and the reweighting technique are useful for studying
the phenomenology associated with the future detection of the cosmic neutrino
background.
