Fermionic Dark Matter Profiles

April 22, 2021
4:00pm to 5:30pm

IFT Seminar Room/Red Room

Specialist level
Carlos Arguelles
UNLP (La Plata)

IFT Seminar Room/Red Room


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.