English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We introduce a non-perturbative method to constrain the amplitude oflocal-type primordial non-Gaussianity ($f_{\rm NL}$) using squeezedconfigurations of the CMB lensing convergence and cosmic shear bispectra.First, we use cosmological consistency relations to derive a model for thesqueezed limit of angular auto- and cross-bispectra of lensing convergencefields in the presence of $f_{\rm NL}$. Using this model, we perform a Fisherforecast with specifications expected for upcoming CMB lensing measurementsfrom the Simons Observatory and CMB-S4, as well as cosmic shear measurementsfrom a Rubin LSST/Euclid-like experiment. Assuming a minimum multipole$\ell_{\rm min}=10$ and maximum multipole $\ell_{\rm max}=1400$, we forecast$\sigma_{f_{\rm NL}}=175$ ($95$) for Simons Observatory (CMB-S4). Our forecastsimprove considerably for an LSST/Euclid-like cosmic shear experiment with threetomographic bins and $\ell_{\rm min}=10$ and $\ell_{\rm max}=1400$ ($5000$)with $\sigma_{f_{\rm NL}}=31$ ($16$). A joint analysis of CMB-S4 lensing andLSST/Euclid-like shear yields little gain over the shear-only forecasts;however, we show that a joint analysis could be useful if the CMB lensingconvergence can be reliably reconstructed at larger angular scales than theshear field. The method presented in this work is a novel and robust techniqueto constrain local primordial non-Gaussianity from upcoming large-scalestructure surveys that is completely independent of the galaxy field (andtherefore any nuisance parameters such as $b_\phi$), thus complementingexisting techniques to constrain $f_{\rm NL}$ using the scale-dependent halobias.

Consistently constraining $f_{\rm NL}$ with the squeezed lensing bispectrum using consistency relations