This work was done by Kip Thorne and his group. Understanding the range of dynamics with black hole coalescence with asymmetric masses and angular momenta as been a long term phenomenological program. Working this complex perturbation theory with GR was something Kip pursued for 30 years This is complication applied math.
It is hard to know whether there are primordial BHs. There must be bounds on them. for if there were a lot of them this would mean the early entropy of the universe would be too large. LC On Wednesday, November 4, 2020 at 2:37:31 PM UTC-6 [email protected] wrote: > In the recent batch of Black Hole mergers that LIGO detected there is one > called GW190412 2.4 billion light years away involving a 8 and a 31 solar > mass Black Hole. This is the greatest difference in mass that LIGO has ever > detected. If the two masses were the same the gravitational wave frequency > would just be twice the orbital frequency because when they change > positions by 180° the system would be the same, but because the masses were > so different this asymmetry produced all sorts of interesting harmonics > that exactly conformed to what Einstein predicted. It's never a good idea > to bet against Einstein. It's worth noting that the smaller of the 2 Black > Holes was spinning rapidly as you would expect if it was made from a > collapsing star, but the larger one was spinning very slowly if at all. > Theory predicts that if Primordial Black Holes exist then when they were > first created, a time before there were atoms or even protons or neutrons, > they would not be spinning at all, although they could pick up some spin > later from infalling material. > > GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric > Masses <https://arxiv.org/abs/2004.08342> > > John K Clark > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/70c8de8e-0145-4b10-bd58-faf6d3e4ad8en%40googlegroups.com.
