The Impact of Theoretical Uncertainties in the Halo Mass Function and Halo Bias on Precision Cosmology Export

@article{citeulike:5978899, 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.}, archivePrefix = {arXiv}, author = {Wu, Hao-Yi and Zentner, Andrew R. and Wechsler, Risa H.}, citeulike-article-id = {5978899}, citeulike-linkout-0 = {http://arxiv.org/abs/0910.3668}, citeulike-linkout-1 = {http://arxiv.org/pdf/0910.3668}, day = {20}, eprint = {0910.3668}, keywords = {cluster\_cosmo, halo, mass\_function, power\_spec}, month = {Oct}, posted-at = {2009-10-21 08:35:39}, priority = {2}, title = {The Impact of Theoretical Uncertainties in the Halo Mass Function and Halo Bias on Precision Cosmology}, url = {http://arxiv.org/abs/0910.3668}, year = {2009} }

TY - JOUR ID - citeulike:5978899 L3 - citeulike-article-id:5978899 N2 - 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. TI - The Impact of Theoretical Uncertainties in the Halo Mass Function and Halo Bias on Precision Cosmology KW - cluster_cosmo KW - halo KW - mass_function KW - power_spec AU - Wu, Hao-Yi AU - Zentner, Andrew AU - Wechsler, Risa PY - 2009/Oct/20/ UR - http://arxiv.org/abs/0910.3668 ER -