Nieshtze t1_iua3g98 wrote on October 29, 2022 at 7:06 PM

Reply to comment by exscape in Is dark matter orbiting galaxies with the same speed as normal matter? by taracus

And they haven't found a single piece of direct evidence for a massive particle yet, only neutrinos. Are there good reasons to believe that they have a non-zero interaction with electromagnetic field?

Aseyhe t1_iua4hmd wrote on October 29, 2022 at 7:13 PM

Not necessarily electromagnetic, but we think dark matter should have some nongravitational interaction with ordinary matter in order to be created in the first place. Although, purely gravitational production is also possible...