Can 'warm' particles provide the missing mass in dwarf galaxies?

Details Can 'warm' particles provide the missing mass in dwarf galaxies? Can 'warm' particles provide the missing mass in dwarf galaxies?

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298....1m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 1, 1985, p. 1-7.

Astronomy and Astrophysics

Astrophysics

6

Big Bang Cosmology, Dwarf Galaxies, Missing Mass (Astrophysics), Neutrinos, Galactic Evolution, Mathematical Models, Power Spectra

Scientific paper

Particles which decouple before quark confinement in a hot big bang will have a number density significantly below that of relic neutrinos. Fermions whose mass exceeds about 500 eV may cluster in dwarf galaxies without violating phase space constraints; however, the free-streaming mass scale for such particles is much larger than a dwarf galaxy mass. Results from a numerical simulation show that this free streaming does not mean such particles cannot provide the missing mass in dwarf galaxies, so long as such dwarf galaxy halos constitute a small fraction of the dark matter in the universe. It is shown that the results of the simulation are not affected by two-body scattering.

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