Damping scales of neutralino cold dark matter

Details Damping scales of neutralino cold dark matter Damping scales of neutralino cold dark matter

2001-04-10

arxiv.org/abs/astro-ph/0104173v2

Phys.Rev.D64:083507,2001

Astronomy and Astrophysics

Astrophysics

13 pages, 5 figures; typos corrected; accepted by Physical Review D

Scientific paper

10.1103/PhysRevD.64.083507

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 about 30 MeV (for typical neutralino and sfermion masses) and free streaming after last scattering of neutralinos. The last scattering temperature is lower than the kinetic decoupling temperature by one order of magnitude. 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 to have masses above 10^(-7) solar masses.

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