Statistics – Computation
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367...54r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 54-63. Research supported by the University of Kansa
Statistics
Computation
16
Dark Matter, Elementary Particles, Fermions, Galactic Structure, Halos, Neutrinos, Computational Astrophysics, Dwarf Galaxies
Scientific paper
Fermi statistics and velocity anisotropy give a surprisingly rich structure to massive neutrino dark matter halos. If a spherically symmetric halo has an anisotropic phase space, then hollow halos with a minimum of the mass density at the center are possible. Hollowness of a halo is controlled by a dimensionless constant K0 involving the fermion mass, the Planck mass, and parameters fixing the halo anisotropy. All dependence of a halo on fermion mass and the maximum phase-space density is contained in K0. For small enough fermion mass and effective core size, most halos must be hollow to satisfy Fermi statistics. Thus, existing neutrino lower mass bounds not only are overly restrictive but become inapplicable. It follows that neutrinos or other fermions in the mass range less than about 100 eV are viable candidates for galactic dark matter.
Ralston John P.
Smith Lesley L.
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