Wednesday, October 19, 2016

Existence of Dark Matter Challenged

A recent paper is causing a stir among cosmologists and bloggers because it appears to present evidence that dark matter may not exist. The authors’ observations reveal a strong correlation between the gravitational acceleration observed to be acting on stars in galaxies and the gravitational acceleration inferred from the distribution of luminous (baryonic) matter. If dark matter is a particle, as almost everyone has been assuming, it can’t explain this behavior. Ethan Siegel at Starts with a Bang comments on the situation here and Sabine Hossenfelder at Backreaction discusses it here.