The SRG-eROSITA All-Sky Survey : Constraints on f(R) Gravity from Cluster Abundance
arxiv(2024)
摘要
The evolution of the cluster mass function traces the growth of the linear
density perturbations and can be utilized for constraining the parameters of
cosmological and alternative gravity models. In this context, we present new
constraints on potential deviations from general relativity by investigating
the Hu-Sawicki parametrization of the f(R) gravity with the first SRG-eROSITA
All-Sky Survey (eRASS1) cluster catalog in the Western Galactic Hemisphere in
combination with the overlapping Dark Energy Survey Year 3, KiloDegree Survey
and Hyper Supreme Camera data for weak lensing mass calibration. For the first
time, we present constraints obtained from cluster abundances only. When we
consider massless neutrinos, we find a strict upper limit of log |fR0| < -4.31
at 95
scales, and thus have the opposite effect of f(R) gravity. We consequently
investigate the joint fit of the mass of the neutrinos with the modified
gravity parameter. We obtain log |fR0| < -4.12 jointly with ∑m_ν< 0.44
e.V. at 95
utilizing cluster counts only. At log |fR0|= - 6, the number of clusters is not
significantly changed by the theory.
Consequently, we do not find any statistical deviation from general
relativity from the study of eRASS1 cluster abundance. Deeper surveys with
eROSITA, increasing the number of detected clusters, will further improve
constraints on log |fR0| and investigate alternative gravity theories.
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