http://arxiv.org/abs/2003.04532
The phase-space bounds on the mass of dark matter are mostly derived for isothermal galactic halos. In this paper, we study slight deviations from the isothermal condition. We show that if fermionic dark matter in galaxies has a Maxwellian distribution, small variations in the temperature of dark matter are negligible. However, in highly Fermi degenerate halos, diversions from constant temperature are multiplied by the infinite Fermi-Dirac integrals and can be significant. We develop computer software to study non-isothermal effects in the full range of classical to highly degenerate dark matter halos. Using the data of the Fornax dwarf galaxy, we show that with a temperature gradient of not more than 0.002 Kelvin per kiloparsec, it is possible to compress fermionic dark matter with the mass of 2 eV into a radius less than 1 kiloparsec and build a halo with the total mass of $\sim 10^8$ of the mass of the sun.
A. Borzou
Wed, 11 Mar 20
38/65
Comments: 37 pages, 7 figures, comments are welcome
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