The Dark Matter Distribution Paradox: A Cosmic Curveball

Astrophysicists have found a discrepancy between the value of the "clumpiness" of the Universe's dark matter, known as S8, derived from the Cosmic Microwave Background and the value found by the Hyper Suprime-Cam Subaru Strategic Program data. The difference could indicate errors or an incomplete cosmological model. The team measured the distortion of light from 25 million faint galaxies billions of light-years away to determine the clumpiness of the Universe today. The discrepancy is small but statistically significant, and the team will further investigate using the full HSC-SSP data set and refined methods.