Journal
ASTROPHYSICAL JOURNAL
Volume 748, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/748/1/57
Keywords
cosmological parameters; dark energy; gravitational lensing: weak; large-scale structure of Universe; methods: numerical
Categories
Funding
- Berkeley Center for Cosmological Physics
- JSPS World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan [23340061]
- FIRST CSTP, Japan
- US Department of Energy [DE-FG02-95ER40896]
- National Science Foundation [AST-0908072]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908072] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [23340061, 10J02533] Funding Source: KAKEN
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A logarithmic transform of the convergence field improves the information content, i.e., the overall precision associated with the measurement of the amplitude of the convergence power spectrum, by improving the covariance matrix properties. The translation of this improvement in the information content to that in cosmological parameters, such as those associated with dark energy, requires knowing the sensitivity of the log-transformed field to those cosmological parameters. In this paper, we use N-body simulations with ray tracing to generate convergence fields at multiple source redshifts as a function of cosmology. The gain in information associated with the log-transformed field does lead to tighter constraints on dark energy parameters, but only if shape noise is neglected. The presence of shape noise quickly diminishes the advantage of the log-mapping, more quickly than we would expect based on the information content. With or without shape noise, using a larger pixel size allows for a more efficient log-transformation.
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