Momentum space sampling of neutrinos in $N$-body simulations

Understand

Including massive neutrinos in $N$-body simulations is a challenging task due to the large thermal velocities of the neutrinos.

• In particle based codes this leads to problems of shot-noise due to insufficient sampling of the neutrino momentum distribution function.
• In this paper we investigate the benefits and drawbacks of a scheme first suggested in a paper by Banerjee et al.
• in which the initial neutrino distribution is symmetrised in momentum space.