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Squeezed Limit non-Gaussianity Estimation with Cosmic Shear
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Paper
Squeezed Limit non-Gaussianity Estimation with Cosmic Shear
2025
Overview
We present a new method to constrain local primordial non-Gaussianity using the large-scale modulation of the local lensing power spectrum. Our work extends our recently proposed \\(\\)-field method for primordial non-Gaussianity estimation to spherical coordinates and applies it to galaxy lensing. Our approach is computationally efficient and only requires binned multipole power spectra \\(C_(z_1,z_2)\\) on large scales, as well as their covariance. Our method is simpler to implement than a full bispectrum estimator, but still contains the full squeezed-limit information. We validate our model using a suite of N-body simulations and demonstrate its accuracy in recovering the \\(f_NL\\) values. We then perform a Fisher forecast for an LSST-like weak lensing survey, finding \\(_f_NL 12\\). Our approach readily combines with other \\(f_NL\\)-sensitive fields such as kSZ velocity reconstruction and clustering-based \\(\\)-fields, for a future combined \\(f_NL\\) estimator using various large-scale galaxy and CMB observables.
Publisher
Cornell University Library, arXiv.org
Subject
