Copula-constructed non-Gaussian likelihoods for weak-lensing correlations match simulations better than Gaussians on large scales, yet produce only negligible shifts in S8 for 10 000 deg² surveys.
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The Non-Gaussian Weak-Lensing Likelihood: A Multivariate Copula Construction and Impact on Cosmological Constraints
Copula-constructed non-Gaussian likelihoods for weak-lensing correlations match simulations better than Gaussians on large scales, yet produce only negligible shifts in S8 for 10 000 deg² surveys.