Open AccessInformation content in the halo‐model dark‐matter power spectrum – II. Multiple cosmological parameters
Author(s) -
Neyrinck Mark C.,
Szapudi István
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2006.00275.x
Subject(s) - physics , astrophysics , halo , spectral density , matter power spectrum , dark matter , content (measure theory) , context (archaeology) , lambda cdm model , dark energy , theoretical physics , cosmology , galaxy , statistics , mathematical analysis , paleontology , mathematics , biology
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.