Quote:
Originally Posted by renormalised
despite the very large mass of the hole, spacetime gradient for such a large hole is actually rather small (because of its size). If it were a smaller stellar mass hole, the frame dragging effects would be very pronounced (very steep and intense spacetime gradient), but even more localised.
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I read this, and the rationale for this concept, somewhere recently -a Susskind book, I think.
Interesting to note that at sometime in the early days, it probably started off small so, at that time, it must've also had a big effect on everything around it. Perhaps plain old Newtonian momentum has continued the dynamics into the present day and that's what we're seeing.
The question here would seem to be: How big an impact has this original state made, in comparison with other subsequent effects (eg: gravitational attraction between objects trailing & leading in the arms, collisions with other galaxies, etc). Yet another scale question, I think.
Interesting.
Cheers