String-induced density perturbations in hot dark matter

Details String-induced density perturbations in hot dark matter String-induced density perturbations in hot dark matter

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397...14v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 14-25.

Astronomy and Astrophysics

Astrophysics

9

Cosmology, Dark Matter, Galactic Clusters, Galactic Evolution, String Theory, Equations Of Motion, Fourier Transformation, Hubble Constant, Neutrinos, Perturbation Theory

Scientific paper

The density and velocity perturbations produced by cosmic strings in hot dark matter are examined using the Gilbert equation. We use the results from recent numerical simulations which show that the strings have significant small-scale structure. It is shown that the string network can produce structure whose size is comparable to the size of the observed large-scale structure. It is also shown that the large-scale peculiar velocities produced by the string network are coherent over distances which are too small to account for the observed large-scale streaming motions. The role of the small-scale structure in fragmenting the wakes produced by the strings is examined. It is found that small-scale structure below a critical size cannot fragment the wakes, whereas small-scale structure larger than this critical size may be able to fragment the wakes.

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