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Measuring primordial non-Gaussianity through weak lensing peak counts

Authors
  • Marian, Laura
  • Hilbert, Stefan
  • Smith, Robert E.
  • Schneider, Peter
  • Desjacques, Vincent
Type
Published Article
Publication Date
Apr 18, 2012
Submission Date
Oct 25, 2010
Identifiers
DOI: 10.1088/2041-8205/728/1/L13
Source
arXiv
License
Yellow
External links

Abstract

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, -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 known, f_NL can be measured with an error \Delta f_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 complementary information to that obtained from the cosmic microwave background.

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