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Is Cold Dark Matter Still a Strong Buy? The Lesson from Galaxy Clusters | | Fabio Governato
; Sebastiano Ghigna
; Ben Moore
; | | Date: |
25 May 2001 | | Subject: | astro-ph | | Affiliation: | Osservatorio Astronomico di Brera, Milano), Sebastiano Ghigna (Univ. of Washington,US), Ben Moore (Univ. of Durham, UK | | Abstract: | For the last few years the Cold Dark Matter model (ticker: CDM), has been the dominant theory of structure formation. We briefly review the recent advancements and predictions of the model in the field of galaxy clusters. A new set of very high resolution simulations of galaxy clusters show that they have (1) density profiles with central slopes very close to -1.6 and (2) abundance of subhalos similar to the ones observed in real clusters. These results show a remarkably small cluster to cluster variation and a weak dependence from the particular CDM cosmology chosen (LCDM having ~40% less substructure than SCDM). While still a speculative theory with a high prediction/evidence ratio, subject to strong challenges from observational data and competition from other hierarchical theories, we give CDM a rating of ``market outperform’’ and of ``long term BUY’’. | | Source: | arXiv, astro-ph/0105443 | | Services: | Forum | Review | PDF | Favorites | |
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