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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Analysis of 107 matched strong-lensing and supernova pairs with lens-specific luminosity slopes finds that free stellar anisotropy is statistically required and reveals negative redshift evolution in early-type galaxy density profiles.
Directional tests for H0 anisotropy on Pantheon+ and CSP samples cannot robustly determine anisotropy directions because of intrinsic limits in the SN Ia lightcurve method.
A new two-parameter empirical magnitude-redshift relation for Type Ia supernovae fits observations comparably or better than LambdaCDM and indicates uniform cosmic acceleration.
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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Reassessing the Statistical Necessity of Stellar Velocity Anisotropy in Strong-Lensing Cosmology with Lens-by-Lens Photometric Constraints
Analysis of 107 matched strong-lensing and supernova pairs with lens-specific luminosity slopes finds that free stellar anisotropy is statistically required and reveals negative redshift evolution in early-type galaxy density profiles.
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(An)Isotropy in Pantheon+ and Type Ia supernova samples: intrinsic limits of directional tests
Directional tests for H0 anisotropy on Pantheon+ and CSP samples cannot robustly determine anisotropy directions because of intrinsic limits in the SN Ia lightcurve method.
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A new magnitude--redshift relation based on Type Ia supernovae
A new two-parameter empirical magnitude-redshift relation for Type Ia supernovae fits observations comparably or better than LambdaCDM and indicates uniform cosmic acceleration.