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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Owing to the mass-sheet degeneracy, cosmic shear maps do not probe directlythe Fourier modes of the underlying mass distribution on scales comparable tothe survey size and larger. To assess the corresponding effect on attainablecosmological parameter constraints, we quantify the information on super-surveymodes in a lognormal model and, when interpreted as nuisance parameters, theirdegeneracies to cosmological parameters. Our analytical and numericalcalculations clarify the central role of super-sample covariance (SSC) inshaping the statistical power of cosmological observables. Reconstructing thebackground modes from their non-Gaussian statistical dependence to small scalesmodes yields the renormalized convergence. This diagonalizes the spectrumcovariance matrix, and the information content of the corresponding powerspectrum is increased by a factor of two over standard methods. Unfortunately,careful calculation of the Cramer-Rao bound shows that the information recoverycan never be made complete, any observable built from shear fields, includingoptimal sufficient statistics, are subject to severe information loss,typically $80\%$ to $90\%$ below $\ell \sim 3000$ for generic cosmologicalparameters. The lost information can only be recovered from additional,non-shear based data. Our predictions hold just as well for a tomographicanalysis, and/or full sky surveys.

The impact of super-survey modes on cosmological constraints from cosmic shear fields