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.
Описание
A non-linear solution to the $S_8$ tension II: Analysis of DES Year 3 cosmic shear
%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
}