Mathematics – Logic
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996achph..69..434c&link_type=abstract
Helvetica Physica Acta, Vol. 69, No. 4, p. 434 - 453
Mathematics
Logic
1
Dark Matter: Clusters Of Galaxies, Dark Matter: Galactic Halos, Dark Matter: Cosmology
Scientific paper
The evidence for dark matter from dynamical studies, X-ray observations and gravitational lensing effects is first reviewed. It is argued that one needs a combination of baryonic and non-baryonic solutions. The dark matter in galactic disks (if real) is almost certainly baryonic, in which case white dwarfs or brown dwarfs would be possible candidates. The dark matter in galactic halos could also be partly baryonic and, in this case, it is likely to be contained in the remnants of a first generation of pregalactic or protogalactic stars. The author discusses the various constraints on the nature of such remnants - with particular emphasis on lensing and dynamical limits - and concludes that brown dwarfs are the most plausible candidates. Microlensing searches should either confirm or exclude this possibility very soon. Unless one gives up the standard cosmological nucleosynthesis scenario, the dark matter in clusters or intergalactic space must be non-baryonic. This is probably in the form of cold elementary particle relics or primordial black holes, in which case it should also settle into galactic halos.
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