Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 370, Issue 1, Pages L66-L70Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2006.00190.x
Keywords
cosmology: theory; dark matter; large-scale structure of Universe
Categories
Funding
- NASA [AISR NAG5-11996, ATP NAG5-12101, ATP NAG5-10763]
- NSF [AST-0206243, AST-0434413, ITR 1120201-128440, AST-0205981]
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Using the halo model, we investigate the cosmological Fisher information in the non-linear dark-matter power spectrum about the initial amplitude of linear power. We find that there is little information on 'translinear' scales (where the one-and two-halo terms are both significant) beyond what is on linear scales, but that additional information is present on small scales, where the one-halo term dominates. This behaviour agrees with the surprising results that Rimes & Hamilton found using N-body simulations. We argue that the translinear plateau in cumulative information arises largely from fluctuations in the numbers of large haloes in a finite volume. This implies that more information could be extracted on non-linear scales if the masses of the largest haloes in a survey are known.
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