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.
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Simulations of Euclid cluster data demonstrate that combining number counts and clustering improves the figure of merit by over 300 percent, with photo-z uncertainties broadening posteriors by 20-30 percent and smaller-scale clustering adding useful information.
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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.
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Euclid: Exploring observational systematics in cluster cosmology -- a comprehensive analysis of cluster counts and clustering
Simulations of Euclid cluster data demonstrate that combining number counts and clustering improves the figure of merit by over 300 percent, with photo-z uncertainties broadening posteriors by 20-30 percent and smaller-scale clustering adding useful information.