Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 728, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2041-8205/728/1/L13
Keywords
early universe; galaxies: clusters: general; gravitational lensing: weak; large-scale structure of universe; methods: numerical
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [MA 4967/1-1, SCHN 342/6, WH 6/3]
- Swiss National Foundation [200021-116696/1]
- WCU [R32-2008- 000-10130-0]
- UZurich [FK UZH 57184001]
- Marie Curie Reintegration Grant
- Alexander von Humboldt Foundation
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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 Delta f(NL) approximate to 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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