JWST Observations of Lensed Quasars Hint at Self-Interacting Dark Matter

Dark matter comprises most of the universe's matter yet remains poorly understood. A post says brightness anomalies in 29 JWST-observed lensed quasars yielded Bayesian evidence favoring self-interacting dark matter models with collapsed halos over cold dark matter by factors of 6 to 24, depending on assumptions about globular clusters and subhalos. Cold dark matter is not ruled out; more systems and better lens modeling are needed.