Nick M V Salmon wrote after HOW MANY WHISKEYS 'N' RUM? (;-)):

Hi all

Been thinking about this for some time since seeing the weird looking
 Siefert galaxies in Hubble's 'Deepfield' pic...

[...]

I read somewhere that it is possible for a black hole to rotate so
fast that the singularity and it's associated event horizon become
doughnut shaped. ie. There is a hole right through the middle that is
exterior to the 'no way out' event horizon limit..?

The central body and associated event horizon may be more a fat disk
rather than a donut-with-central-empty-hole.

I could well imagine a black hole _surrounded_ by a gyroscope-like
rotating ('orbiting') toroid of material. There would still be the
singularity in the middle holding it all together.


[...]

What would a Siefert doing that look like in the radio spectrum if
aligned exactly with the earth so that you could see into the exact
centre of the black hole doughnut

It would show some spectacularly wierd doppler effects!


[...]

Dunno, elastic reaction like the 'ouch' if you pull a rubber band
into two halves..? <LOL>

Mmmmm... What games do you play?!



[...]

A little more fun before I head for bed - stream of thought;   Hmmnn,
I've often wondered about what happens at the very heart of a black
hole - matter squeezed to the point that forces we can't even
speculate upon appear to stop it shrinking yet further..?  Does
matter continue shrinking by the force of it's own gravity until it
becomes a singularity..?

There's a huge amount of 'space' in and between atoms. When the various
atomic forces are squashed enough, then everything coelesces into
nutrons (very dense)... After that... I'd like to know!!


[...]

Arrrgghh, I'm now laughing so hard it's difficult to type, so I'd
better stop..............

Hey... This was getting good!

Laterz: Bugger, another thought I just have to put on 'paper' - if
that point at the centre of a toroidal black hole is under sufficient
 decompressive stress, could it open a 'portal' to another 'where'
...

The stuff of many a film of fiction.

Getting a black hole to be truely torroidal is the first problem. The
next is how to go where you want to go rather than just to the same
(gravitational) potential energy level on the opposite side.

(Assuming that you don't get ripped apart leaving just the filament of
material that went through the EXACT centre as you whizzed through. Ouch.)

Sometimes my head hurts... <LOL>

The black hole would barely feel a thing.


Keep crunchin'
(:-))
Martin