BLACK HOLE vs black hole Options

[ustrax]

I would thank if someone indicated studies on this subject...

What if a massive black hole encounters a less massive black hole?
Depending on masses and distances could it be established a relation where the less massive one could influence the more massive one? Like the moon influences tides on earth?...

[odave]

I know from my reading in Sky & Telescope that black hole interaction and mergers have been considered for many phenomena, namely generating gravity waves and possibly gamma ray bursts when they eventually merge. I would assume that you would get the usual tidal effects as black holes of differing masses start to orbit one another. I don't know of any specific sources that are good, other than digging through my old S&Ts, but googling "black hole mergers" or "binary black holes" turns up several links. Here's one on modeling binary black holes.

[ustrax]

I know from my reading in Sky & Telescope that black hole interaction and mergers have been considered for many phenomena, namely generating gravity waves and possibly gamma ray bursts when they eventually merge. I would assume that you would get the usual tidal effects as black holes of differing masses start to orbit one another. I don't know of any specific sources that are good, other than digging through my old S&Ts, but googling "black hole mergers" or "binary black holes" turns up several links. Here's one on modeling binary black holes.

Thanks odave!
I was imagining a binary system where equilibrium could be reached without having the BLACK HOLE devouring the black hole...What could happen in the meeting point?...

[Guest_Myran_*]

To get two black holes in orbit around each other there need to be a method of capture.

These two got into orbit around each other via one galaxy merger.

Many years ago I did see a theoretical graphic for a binary black hole system where the precession made the orbit look like a pretzel.

But yes there would be tidal effects. The ergosphere around each black hole would stretch.
And when orbiting there should be one 'tide' in the ergosphere when the smaller black hole orbits the other.

Then what about the even horizon?
I tried some offhand calculus and came up with the impossible result that the event horizon would shrink somewhat when the other black hole passes overhead.

For a moment I thought I had gotten the numbers wrong and was about not mentioning it at all.

But then realisation struck me, that it might be correct. When gravity decreases, the even horizon would then shrink after all when the other black hole pass overhead.

These objects are so odd they do many things that are counter inituitive!

[dvandorn]

This brings up an interesting possibility in my mind.

If a close binary black hole causes the event horizons to fluctuate, then some mass and energy that has fallen inside the event horizon *ought* to be able to escape again. Could it be possible to fly a probe on a trajectory that intersects the event horizon in such a manner that it then flies *out* of the horizon, intact, as the horizon fluctuates?

I grant you, it's unlikely that we could ever find such a black hole binary pair to which we could ever travel... but it's an intriguing possibility.

-the other Doug

[ustrax]

This brings up an interesting possibility in my mind.

If a close binary black hole causes the event horizons to fluctuate, then some mass and energy that has fallen inside the event horizon *ought* to be able to escape again. Could it be possible to fly a probe on a trajectory that intersects the event horizon in such a manner that it then flies *out* of the horizon, intact, as the horizon fluctuates?

I grant you, it's unlikely that we could ever find such a black hole binary pair to which we could ever travel... but it's an intriguing possibility.

-the other Doug

Unlikely...But not impossible?
I was thinking about this possibility as a path for inverting black hole's non return nature...
So, it would be possible to recover mass and energy from their imprisionement?
And where have they been all that time?...

Myran, thanks for the answer, and for your counter intuitive realisation!
So we would have both black holes influencing each other in spite of their masses?
I return to my previous question appealing to your counter intuition again...
Can a equilibrium be reached where the members of this binary system could feed one another from the "ressuscitated" mass and energy?

EDITED: Wow!...
This is a whole new world for me!

[ustrax]

I have to start from the basics...And the basics is incredible!

[ngunn]

Just some day-dreaming - nothing rigorous:

Medium and small black holes are incredibly violent but BIG BLACK HOLES are a different matter. Their density is very low and you could drift through the event horizon without noticing. Once inside you would be surprised to find no sign of a central singularity in the sense of a point in space located some distance in front of you. By falling in you would have exchanged the radial space dimension for the dimension of time, so the singularity would now seem to be a point in time many aeons in your past. You would notice that your environment was spacially homogeneous over large scales with no apparent boundaries - and call it YOUR UNIVERSE.

[ustrax]

...and call it YOUR UNIVERSE.

It could lead to that conclusion...

Is there some theoretic scenario presenting a black hole like a, pardon me my non-astrophysical terms..., whirlpool-like-stomach?...
Processing some particles and releasing those that are not used (this is not a pleasant thing to imagine...) in one eventual extremity? Or does a black hole consume EVERYTHING? Gravitons can escape...