Cosmic-string-induced hot dark matter perturbations

Details Cosmic-string-induced hot dark matter perturbations Cosmic-string-induced hot dark matter perturbations

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..356v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 10, 1990, p. 356-363. Research supported by DOE.

Astronomy and Astrophysics

Astrophysics

1

Dark Matter, Galactic Clusters, String Theory, Baryons, Cosmology, Relativistic Particles

Scientific paper

This paper investigates the evolution of initially relativistic matter, radiation, and baryons around cosmic string seed perturbations. A detailed analysis of the linear evolution of spherical perturbations in a universe is carried out, and this formalism is used to study the evolution of perturbations around a sphere of uniform density and fixed radius, approximating a loop of cosmic string. It was found that, on scales less than a few megaparsec, the results agree with the nonrelativistic calculation of previous authors. On greater scales, there is a deviation approaching a factor of 2-3 in the perturbation mass. It is shown that a scenario with cosmic strings, hot dark matter, and a Hubble constant greater than 75 km/sec per Mpc can generally produce structure on the observed mass scales and at the appropriate time: 1 + z = about 4 for galaxies and 1 + z = about 1.5 for Abell clusters.

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