A University of California, Riverside-led team of physicists has found a simple and viable explanation for the diversity observed in galactic rotations. Hai-Bo Yu and colleagues report that diverse galactic-rotation curves, a graph of rotation speeds at different distances from the center, can be naturally explained if dark matter particles are assumed to strongly collide with one another in the inner halo, close to the galaxy’s center–a process called dark matter self-nteraction.
Full story at https://ucrtoday.ucr.edu/48870
University of California, Riverside
This is an NSF News From the Field item.