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- W4377089788 abstract "Weak galaxy lensing surveys have consistently reported low values of the $S_8$ parameter compared to the $textit{Planck} Lambdarm{CDM}$ cosmology. Amon & Efstathiou (2022) used KiDS-1000 cosmic shear measurements to propose that this tension can be reconciled if the matter fluctuation spectrum is suppressed more strongly on non-linear scales than assumed in state-of-the-art hydrodynamical simulations. In this paper, we investigate cosmic shear data from the Dark Energy Survey (DES) Year 3. The non-linear suppression of the matter power spectrum required to resolve the $S_8$ tension between DES and the $textit{Planck} Lambdarm{CDM}$ model is not as strong as inferred using KiDS data, but is still more extreme than predictions from recent numerical simulations. An alternative possibility is that non-standard dark matter contributes to the required suppression. We investigate the redshift and scale dependence of the suppression of the matter power spectrum. If our proposed explanation of the $S_8$ tension is correct, the required suppression must extend into the mildly non-linear regime to wavenumbers $ksim 0.2 h {rm Mpc}^{-1}$. In addition, all measures of $S_8$ using linear scales should agree with the $textit{Planck} Lambdarm{CDM}$ cosmology, an expectation that will be testable to high precision in the near future." @default.
- W4377089788 created "2023-05-20" @default.
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- W4377089788 date "2023-05-16" @default.
- W4377089788 modified "2023-09-27" @default.
- W4377089788 title "A non-linear solution to the $S_8$ tension II: Analysis of DES Year 3 cosmic shear" @default.
- W4377089788 doi "https://doi.org/10.48550/arxiv.2305.09827" @default.
- W4377089788 hasPublicationYear "2023" @default.
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