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.
J., Klein, M., & Dolag, K
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Simulation-based priors that depend on cluster morphology allow mock X-ray/SZ cluster samples to recover the input Hubble constant with 4% (100 clusters) and 1.5% (1000 clusters) precision plus a systematic floor of 0.6–0.8 km/s/Mpc.
citing papers explorer
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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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The Three Hundred Project: Validating $H_0$ inference from mock X-ray and millimetre analyses of galaxy clusters
Simulation-based priors that depend on cluster morphology allow mock X-ray/SZ cluster samples to recover the input Hubble constant with 4% (100 clusters) and 1.5% (1000 clusters) precision plus a systematic floor of 0.6–0.8 km/s/Mpc.