THE MIGHTY AND THE TINY. “But the physicists have found that two previously detected black holes are spinning too fast to have been affected by any ultralight bosons. Because of their large spins, the black holes’ existence rules out the existence of ultralight bosons with masses between 1.3×10(-13) electronvolts and 2.7×10(-13) electronvolts — around a quintillionth the mass of an electron.”
https://lnkd.in/dRWpnua