1998/10/26 by Carsten van de Bruck, van de Bruck, Carsten
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9810409
15 pages, latex, 8 embedded figures. To appear in the proceedings of the Second International Workshop on Dark Matter (DARK98), eds. H.V. Klapdor-Kleingrothaus and L. Baudis
arxiv created 1998/10/26 · arxiv updated 2009/12/01
We discuss structure formation in cosmic string theories. Emphasis is laid on the properties of the peculiar velocity field, non-gaussian features and clusters of galaxies. It is found that the predicted peculiar velocity field is quiet (v<150 km/s for L>30 h-1 Mpc) for models with (Ω0 h ≤ 0.2) which is in disagreement with the results from POTENT at large scales (>30h-1 Mpc), consistent, however, with the analysis of the peculiar velocity field of spiral galaxies by Giovannelli et al.. Using the Press-Schechter formalism we calculate the abundances of X-ray clusters. It is found that in CDM models a mass fluctuation σ8 = 0.6...0.7 is needed with Ω0 h =0.1...0.2 in order to explain the current data.