Galaxy cluster counts from eRASS1 plus weak lensing data set the tightest existing upper bounds on ultralight axion relic density Ω_a around 10^{-27} eV (Ω_a < 0.0035) and 10^{-26} eV (Ω_a < 0.0079) at 95% CL.
2024a, arXiv e-prints
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Fixing the covariance at an incorrect cosmology in cluster count analyses leaves Ω_c, σ_8, and w estimates unbiased but distorts their uncertainties, driven by S_8 amplitude effects; a single update at the recovered best-fit cosmology restores correct normalization for LSST-like surveys.
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The SRG/eROSITA all-sky survey: Constraints on Ultra-light Axion Dark Matter through Galaxy Cluster Number Counts
Galaxy cluster counts from eRASS1 plus weak lensing data set the tightest existing upper bounds on ultralight axion relic density Ω_a around 10^{-27} eV (Ω_a < 0.0035) and 10^{-26} eV (Ω_a < 0.0079) at 95% CL.