[ExI] Time lapse film of exploding star

spike at rainier66.com spike at rainier66.com
Sun Sep 11 14:25:05 UTC 2022

-----Original Message-----
From: extropy-chat <extropy-chat-bounces at lists.extropy.org> On Behalf Of BillK via extropy-chat
>> I am still baffled with regard to how there could still be so many of them.  Where does all the angular momentum go?  Stuart is that blowing your mind too?  I remember spending several weeks pondering that and doing calculations, got nowhere at all, not a cm closer to understanding.
> spike
> _______________________________________________

Wikipedia says angular momentum is radiated away by the gravitational waves.


Energy, momentum, and angular momentum
>...—the angular momentum is radiated away by gravitational waves.



Ja BillK, but if you do the calculations on that it seems like it would take trillions of years in most cases for all the momentum to be radiated away in gravitational waves, unless those black holes somehow formed dang close together to start with (how?) or the angular momentum was canceled up from enormous accretion discs (where did those come from?) as the black holes grew from matter in the disk.  This latter is the only thing I can imagine: our models of how much stuff was available in the old days are wrong.  There must have been a lot more stuff in the old days to make those black holes form close together and grow really big. Heh.  That's an exciting possibility: the standard model is wrong.

None of the models I can imagine fit very well with this many merger events, and none of them which had been proposed before the instrument was turned on suggested there would be this many, even within a coupla orders of magnitude.  As I recall, the most optimistic LIGO promoter agreed  we would be lucky to see an event in any given decade, but felt it was worth building anyway, for a negative result is a result.

Well now.


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