Information content in the halo-model dark-matter power spectrum II: Multiple cosmological parameters

Details Information content in the halo-model dark-matter power spectrum II: Multiple cosmological parameters Information content in the halo-model dark-matter power spectrum II: Multiple cosmological parameters

2006-10-06

arxiv.org/abs/astro-ph/0610211v2

Mon.Not.Roy.Astron.Soc.375:L51-L55,2007

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures (1 clarified), MNRAS Letters, in press. Minor changes, suggested by referee

Scientific paper

10.1111/j.1745-3933.2006.00275.x

We investigate the cosmological Fisher information in the non-linear dark-matter power spectrum in the context of the halo model. We find that there is a plateau in information content on translinear scales which is generic to all cosmological parameters we tried. There is a rise in information on smaller scales, but we find that it is quite degenerate among different cosmological parameters (except, perhaps, the tilt). This suggests that it could be difficult to constrain cosmological parameters using the non-linear regime of the dark-matter power spectrum. We suggest ways to get around this problem, such as removing the largest haloes from consideration in survey analysis.

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