Damping of inhomogeneities in neutralino dark matter

Details Damping of inhomogeneities in neutralino dark matter Damping of inhomogeneities in neutralino dark matter

2001-10-29

arxiv.org/abs/astro-ph/0110601v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures; contribution to the HEP2001 proceedings

Scientific paper

The lightest supersymmetric particle, most likely the neutralino, might account for a large fraction of dark matter in the Universe. We show that the primordial spectrum of density fluctuations in neutralino cold dark matter (CDM) has a sharp cut-off due to two damping mechanisms: collisional damping during the kinetic decoupling of the neutralinos at O(10 MeV) and free streaming after last scattering of neutralinos. The cut-off in the primordial spectrum defines a minimal mass for CDM objects in hierarchical structure formation. For typical neutralino and sfermion masses the first gravitationally bound neutralino clouds have masses above 10^(-6) M_\odot.

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