On estimating the neutrino mass bound as a dark-matter candidate in galactic halos

Details On estimating the neutrino mass bound as a dark-matter candidate in galactic halos On estimating the neutrino mass bound as a dark-matter candidate in galactic halos

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45....1t&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 1, p. 1-5.

Statistics

Computation

2

Dark Matter, Galactic Halos, Neutrinos, Particle Mass, Computational Astrophysics, Distribution Functions, Gravitational Effects

Scientific paper

We carried out a numerical estimation of the neutrino mass bound for dark matter in galactic halos for an anisotropic distribution function. Contrary to a suggestion that the mass bound can be arbitrarily low, we have shown that the mass bound is reduced at best by a small factor compared to that given for the Maxwellian distribution function. By applying our method to the galaxy DDO 154, the mass bound turns out to be about 40 eV, compared to 94 eV for the Maxwellian case. We argue that this conclusion is rather independent of the shape of the distribution function, since the lower neutrino mass would require an unreasonably extended halo to confine high-velocity neutrinos while maintaining a flat rotation curve.

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