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19 April 2024 |
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The Impact of Theoretical Uncertainties in the Halo Mass Function and Halo Bias on Precision Cosmology | | Hao-Yi Wu
; Andrew R. Zentner
; Risa H. Wechsler
; | | Date: |
20 Oct 2009 | | Abstract: | We study the impact of the theoretical uncertainty in the dark matter halo
mass function and halo bias on the dark energy constraints from imminent galaxy
cluster surveys. We find that for an optical cluster survey like the Dark
Energy Survey, the accuracy required on the predicted halo mass function to
make it an insignificant source of error on dark energy parameters is ~ 1 %.
The analogous requirement on the predicted halo bias is less stringent ~ 5 %,
particularly if the observable--mass distribution can be well constrained by
other means. These requirements depend upon survey area but are relatively
insensitive to survey depth. The most stringent requirements are likely to come
from a survey over a significant fraction of the sky that aims to observe
clusters down to relatively low mass, 10^13.7 Msun/h; for such a survey, the
mass function and halo bias must be predicted to accuracies of ~ 0.5 % and ~ 1
% respectively. These accuracies represent a limit on the practical need to
calibrate ever more accurate halo mass and bias functions. We find that
improving predictions for the mass function in the low-redshift and low-mass
regimes is the most effective way to improve dark energy constraints. | | Source: | arXiv, 0910.3668 | | Services: | Forum | Review | PDF | Favorites | |
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