Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299...37b&link_type=abstract
Nature, vol. 299, Sept. 2, 1982, p. 37, 38. Research supported by the U.S. Department of Energy and NSF.
Astronomy and Astrophysics
Astronomy
61
Cosmology, Galactic Evolution, Neutral Particles, Particle Mass, Astronomical Models, Baryons, Particle Interactions, Spiral Galaxies
Scientific paper
The 'gravitino', a spin 3/2 supersymmetric partner of the graviton which has been shown by Pagels and Primack (1982) to have a mass not greater than about 1 keV if stable, is considered as a candidate to be counted among neutral particles interacting more weakly than neutrinos, decoupling earlier, having a smaller number density today, and therefore possessing a mass greater than 50 eV without exceeding the observational mass density limit. The Jeans mass for a 1 keV noninteracting particle is about one billion solar masses, comparable to the mass of a typical spiral galaxy, including the nonluminous halo. It is suggested that a gravitino-dominated universe can produce galaxies by gravitational instability, while avoiding the observational difficulties associated with the neutrino-dominated universe.
Blumenthal George R.
Pagels Heinz
Primack Joel R.
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