%0 Generic %1 preston2023nonlinear %A Preston, Calvin %A Amon, Alexandra %A Efstathiou, George %D 2023 %K tifr %T A non-linear solution to the $S_8$ tension II: Analysis of DES Year 3 cosmic shear %U http://arxiv.org/abs/2305.09827 %X Weak galaxy lensing surveys have consistently reported low values of the $S_8$ parameter compared to the $Planck\ ŁambdaCDM$ 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 $Planck\ ŁambdaCDM$ 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 $k0.2 h \rm Mpc^-1$. In addition, all measures of $S_8$ using linear scales should agree with the $Planck\ ŁambdaCDM$ cosmology, an expectation that will be testable to high precision in the near future.

@misc{preston2023nonlinear, abstract = {Weak galaxy lensing surveys have consistently reported low values of the $S_8$ parameter compared to the $\textit{Planck}\ \Lambda\rm{CDM}$ 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 $\textit{Planck}\ \Lambda\rm{CDM}$ 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 $k\sim 0.2 h {\rm Mpc}^{-1}$. In addition, all measures of $S_8$ using linear scales should agree with the $\textit{Planck}\ \Lambda\rm{CDM}$ cosmology, an expectation that will be testable to high precision in the near future.}, added-at = {2023-05-18T06:59:43.000+0200}, author = {Preston, Calvin and Amon, Alexandra and Efstathiou, George}, biburl = {https://www.bibsonomy.org/bibtex/2e937eb6141de6258060ccaba9d9c7544/citekhatri}, description = {A non-linear solution to the $S_8$ tension II: Analysis of DES Year 3 cosmic shear}, interhash = {2a4d4cc9950e63880c40623cd5c7e40b}, intrahash = {e937eb6141de6258060ccaba9d9c7544}, keywords = {tifr}, note = {cite arxiv:2305.09827Comment: 12 pages, 9 figures}, timestamp = {2023-05-18T06:59:43.000+0200}, title = {A non-linear solution to the $S_8$ tension II: Analysis of DES Year 3 cosmic shear}, url = {http://arxiv.org/abs/2305.09827}, year = 2023 }