New theory

[eswit12344]

I have been thinking what would happen if two black holes collided? Well I've been thinking about It what if it could have so much gravity that it could rip the space-time? So you measure both black holes gravity then you can add them then measure the effect on the space-time.

[swansont]

I have been thinking what would happen if two black holes collided?

 

You'd get a bigger black hole.

[Strange]

I have been thinking what would happen if two black holes collided?

 

There has been a huge amount of research on this (and there are some great simulations out there). Here is the first result I found:

http://www.astro.cardiff.ac.uk/research/gravity/tutorial/?page=4blackholecollisions

[Andrew A]

If u where to get a bigger black hole, when a normal black hole is hypothesized to be the gateway to a white hole would you get two white holes in two universes combined into one? I'm basing this off Steven Hawking's Theory on black holes being gateways to a new universe.

[ajb]

If u where to get a bigger black hole, when a normal black hole is hypothesized to be the gateway to a white hole would you get two white holes in two universes combined into one? I'm basing this off Steven Hawking's Theory on black holes being gateways to a new universe.

Mathematically, it looks like white holes are a viable solution to the field equations, however we know they cannot form from gravitational collapse and no physical mechanisms for their formation is known. Moreover, no white hole has ever been observed in our Universe. Right now they are hypothetical and seem unphysical.

 

Anyway, as others have already mentioned, the merger of black holes is numerically well studied.

[Nicholas Kang]

I don`t really understand why nobody mentioned "gravitational wave". As far as I know, there are 2 possible outcomes.

 

First, if the black holes are of similar sizes and are spinning, they may not merge at all but violently recoil, sending one of the pair hurtling away. If, however, the black holes do indeed coalesce, enormous amounts of energy would be released and massive ripples, called gravitational waves, would be sent through space-time. So far, however, no instrument has yet detected these tell-tale gravitational waves. Famous one includes LIGO.

 

If I recalled correctly, there is a similar question being asked before in BBC Knowledge Asia Edition. I knew the above information from there.

[MigL]

I don't understand why they would recoil, Nicholas.

There is no way for them to undergo a classical collision.

Once any part of their event horizons merge, there is no escape.

 

I'm thinking it has to do with the spin and the properties that it gives to the dual event horizons.

Do you have anymore information on the subject ?

[eswit12344]

I see what the theoretical astrophysics are saying but if we look at a black holes gravity if it combined wouldn't we see large affects on reality.

[ACG52]

Two stellar Black Holes, each with a mass of 10 solar masses will combine to create a Black Hole of 20 solar masses.

 

Black holes gravity is no greater than that of the mass which created the Black Hole. If the sun were to suddenly become a BH (which can't happen as the sun's mass is too low) there would be no change in the gravity that we could notice on earth. It's only as you approach the event horizon that gravity becomes stronger, and that's due to the decreased distance from the center of mass.

[ajb]

I see what the theoretical astrophysics are saying but if we look at a black holes gravity if it combined wouldn't we see large affects on reality.

Maybe large effects if you are near by. However, for us the 'large effects' would be gravitational waves, which in fact are very hard to detect directly.