Fermionic Dark Matter Profiles

Abstract: We discuss the problem of dark matter halos, by assuming a quantum fermionic particle as the building block for the DM component, each of which self-gravitates in a quasi-virialized system of collisionless fermions. We show that DM fermions accounting for the Pauli-principle and particle escape effects in the coarse-grained phase-space distribution at relaxation, can lead to a more general density profile which developes a degenerate-core surrounded by a diluted-halo able to reproduce the galaxy rotation curves. Interestingly, such very dense nucleus of dark matter at the center of the DM halo, can mimic the effects of a central black hole, or eventually collapse to form one. In the case of our Galaxy, we show that the dense DM core can produce similar gravitational effects than the putative massive BH centered in SgrA*, for particle masses m ~ 10 -100 keV. The formation mechanism, stability, and other astrophysical and cosmological consequences of such novel fermionic profiles will be discussed as well.

astrophysicshigh energy physics

Audience: researchers in the topic

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