A spherical-symmetry N-body algorithm, NSphere, quickly evolves dark matter halos, and finds that after sudden tidal stripping a halo relaxes to a density profile falling as r^-10.
Neutrinos in Non-linear Structure Formation - The Effect on Halo Properties
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We use N-body simulations to find the effect of neutrino masses on halo properties, and investigate how the density profiles of both the neutrino and the dark matter components change as a function of the neutrino mass. We compare our neutrino density profiles with results from the N-one-body method and find good agreement. We also show and explain why the Tremaine-Gunn bound for the neutrinos is not saturated. Finally we study how the halo mass function changes as a function of the neutrino mass and compare our results with the Sheth-Tormen semi-analytic formulae. Our results are important for surveys which aim at probing cosmological parameters using clusters, as well as future experiments aiming at measuring the cosmic neutrino background directly.
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Evolution of self-gravitating spherical dark-matter halos with and without new physics
A spherical-symmetry N-body algorithm, NSphere, quickly evolves dark matter halos, and finds that after sudden tidal stripping a halo relaxes to a density profile falling as r^-10.