Measuring primordial non-Gaussianity through weak lensing peak counts
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.
Cite
@article{arxiv.1010.5242,
title = {Measuring primordial non-Gaussianity through weak lensing peak counts},
author = {Laura Marian and Stefan Hilbert and Robert E. Smith and Peter Schneider and Vincent Desjacques},
journal= {arXiv preprint arXiv:1010.5242},
year = {2012}
}
Comments
4 pages, 1 figure