1810.01781
Constraining neutrino mass with tomographic weak lensing peak counts
Li, et al
Massive cosmic neutrinos change the structure formation history by suppressing perturbations on small scales. WL data from galaxy surveys probe the structure evolution and thereby can be used to construing the total mass of the 3 active neutrinos. However, much of the information is at small scales where the dynamics are nonlinear. Traditional approaches with second order statistics thus fail to fully extract the information in the lensing fields. In this paper, study constraints on the neutrino mass sum using lensing peak counts, a statistic which captures non-Gaussian information beyond the second order. Use the ray-traced WL mocks from the Cosmological Massive Neutrino Simulations (MassiveNuS), and apply LSST-like nose. Discuss the effects of z tomography, multipole cutoff ell_max fo the power spectrum, smoothing scale for the peak counts, and constraints from peaks of different heights. Find that combining peak counts with the traditional lensing power spectrum can improve the constraint on neutrino mass sum, Omega_m, and A_s by 39%, 32%, and 60%, respectively, over that from the power spectrum alone.
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