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**CurtisTH** · 08-11-2009, 05:26 AM

Its theorized that this repulsive force might even eventually reach the point when the remaining Stars and Planets and in fact anything material are torn apart as atoms themselves became repulsed from one another.....

It would need to become immensely strong to do that though - so much so that your query ("Would there be any black holes remaining in that far distant time?") would essentially become moot, as the forces that bind electron and nucleons together utterly overwhelm the estimated expansion "force" and gravity now; thus, if it did somehow change to become significantly larger, all known nuclear and electromagnetic processes would cease....

What happens to the event horizons (specifically their radii) when those of 2 blackholes cross one another?

Given that the event horizons are simply arbitary (well, somewhat arbitrary) boundaries in heavily curved spacetime, each black hole will influence the other's spacetime curvature, so the event horizons will become modified accordingly. A bit of net scouring found this simple animation to demonstrate the point:

(Source)

How does a black hole manage to eject material when it becomes a Quasar?

As InsaneChild pointed out, the ejection occurs some distance away from the event horizon in the accretion disc around the hole - just as with all black holes. It's worth noting that black holes don't become quasars: the latter are thought to be galaxies with a highly active nucleus. So it would be a case of: matter condenses to form stars, which condense to form a galaxy; black holes form within that galaxy which eventually (the exact mechanism is still open to conjecture) results in a supermassive black hole at the centre of the galaxy. Some additional mechanism results in either a huge accretion disc forming around the SBH or a large quantity of mass is "absorbed" by the SBH very rapidly: either way, it releases immensely powerful matter/radiation jets, making the galaxy visible today, despite the large redshift present.

08-11-2009, 05:26 AM	#43
CurtisTH Join Date Nov 2005 Posts 391 Senior Member	Its theorized that this repulsive force might even eventually reach the point when the remaining Stars and Planets and in fact anything material are torn apart as atoms themselves became repulsed from one another..... It would need to become immensely strong to do that though - so much so that your query ("Would there be any black holes remaining in that far distant time?") would essentially become moot, as the forces that bind electron and nucleons together utterly overwhelm the estimated expansion "force" and gravity now; thus, if it did somehow change to become significantly larger, all known nuclear and electromagnetic processes would cease.... What happens to the event horizons (specifically their radii) when those of 2 blackholes cross one another? Given that the event horizons are simply arbitary (well, somewhat arbitrary) boundaries in heavily curved spacetime, each black hole will influence the other's spacetime curvature, so the event horizons will become modified accordingly. A bit of net scouring found this simple animation to demonstrate the point: (Source) How does a black hole manage to eject material when it becomes a Quasar? As InsaneChild pointed out, the ejection occurs some distance away from the event horizon in the accretion disc around the hole - just as with all black holes. It's worth noting that black holes don't become quasars: the latter are thought to be galaxies with a highly active nucleus. So it would be a case of: matter condenses to form stars, which condense to form a galaxy; black holes form within that galaxy which eventually (the exact mechanism is still open to conjecture) results in a supermassive black hole at the centre of the galaxy. Some additional mechanism results in either a huge accretion disc forming around the SBH or a large quantity of mass is "absorbed" by the SBH very rapidly: either way, it releases immensely powerful matter/radiation jets, making the galaxy visible today, despite the large redshift present.
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