Relic neutrino clustering in the Milky Way
  The Standard Cosmological Model predicts the existence of relic neutrinos,
which are indirectly probed through the effective number of relativistic
species in the early Universe. In addition, from neutrino flavour oscillations
we know that at least two of the neutrino mass states have a non-zero mass.
Since the expansion of the Universe has diluted the energy of relic neutrinos,
those that are massive are also non relativistic today. This means that they
can be trapped in strong gravitational potentials, such as the one of the Milky
Way. We review the calculation of the local overdensity of relic neutrinos
produced from the gravitational attraction of our Galaxy, Andromeda and the
Virgo cluster, commenting on the implications for an experiment aiming at relic
neutrino detection, such as the PTOLEMY project.
