Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 729, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2041-8205/729/1/L11
Keywords
cosmology: theory; gravitational lensing: weak; large-scale structure of universe
Categories
Funding
- World Premier International Research Center Initiative (WPI Initiative)
- MEXT, Japan [467]
- JSPS
- DOE at Fermilab [DE-FG02-95ER40896]
- NSF [AST-0908072, AST-0607667]
- U.S. Department of Energy (DOE) [DE-FG02-95ER40896] Funding Source: U.S. Department of Energy (DOE)
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0908072] Funding Source: National Science Foundation
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Gravitational lensing of distant galaxies can be exploited to infer the convergence field as a function of angular position on the sky. The statistics of this field, much like that of the cosmic microwave background (CMB), can be studied to extract information about fundamental parameters in cosmology, most notably the dark energy in the universe. Unlike the CMB, the distribution of matter in the universe which determines the convergence field is highly non-Gaussian, reflecting the nonlinear processes that accompanied structure formation. Much of the cosmic information contained in the initial field is therefore unavailable to the standard power spectrum measurements. Here we propose a method for re-capturing cosmic information by using the power spectrum of a simple function of the observed (nonlinear) convergence field. We adapt the approach of Neyrinck et al. to lensing by using a modified logarithmic transform of the convergence field. The Fourier transform of the log-transformed field has modes that are nearly uncorrelated, which allows for additional cosmological information to be extracted from small-scale modes.
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