Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-48306
Marian, L; Hilbert, S; Smith, R E; Schneider, P; Desjacques, V (2011). Measuring primordial non-Gaussianity through weak lensing peak counts. Astrophysical Journal Letters, 728(1):L13.
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We explore the possibility of detecting primordial non-Gaussianity of the local type using weak-lensing peak counts. We measure the peak abundance in sets of simulated weak-lensing maps corresponding to three models f NL = 0, - 100, and 100. Using survey specifications similar to those of EUCLID and without assuming any knowledge of the lens and source redshifts, we find the peak functions of the non-Gaussian models with f NL = ±100 to differ by up to 15% from the Gaussian peak function at the high-mass end. For the assumed survey parameters, the probability of fitting an f NL = 0 peak function to the f NL = ±100 peak functions is less than 0.1%. Assuming the other cosmological parameters are known, f NL can be measured with an error Δf NL ≈ 13. It is therefore possible that future weak-lensing surveys like EUCLID and LSST may detect primordial non-Gaussianity from the abundance of peak counts, and provide information complementary to that obtained from the cosmic microwave background.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Dewey Decimal Classification:||530 Physics|
|Deposited On:||18 Feb 2012 14:21|
|Last Modified:||05 Apr 2016 14:55|
|Publisher:||Institute of Physics Publishing|
|ISSN:||0004-637X (P) 1538-4357 (E)|
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