Singularity and Anti singularity

thehindmost

What would happen if a singularity collapsed from normal matter collided with one collapsed from antimatter? Or if the collapse into a singularity negated the line between anti/normal matter, what would happen if a stellar sized mass of antimatter collided with a black hole?

Janus

You'd get a larger black hole. Matter and Anti-matter are all the same in terms of mass and gravitational effect.

qwe

i believe he meant to pose this question: what if particles with negative mass can exist in nature, and what if a black singularity of such particles collides with a normal singularity?

of course, you can't have a singularity/black hole of particles that want to get away from eachother. it's the opposite of gravity. so that question is moot as well

bapowell

I don't think so. He asked about antimatter, which is not matter with a negative mass.

Frame Dragger

1.) What is a "Black Singularity"?
2.) His question was pretty clear... where did you read this?
3.) "partcles" don't collide with a singularity, or maybe they do... after the event horizon there is no predictive theory... so... huh?
4.) A BH is not "particles"... it isn't matter.. it's a region of spacetime defined by mass, charge, and spin. PERIOD.

PaulS1950

If you make the assumption that the state of matter was constant (which it cannot be) then you could expect the same result from a "normal black hole" and an "anti-black hole" to generate the same kind of explosion that happens when any antimatter meets an equivalent piece of matter.
The problem is that "matter" as it normally exists cannot exist in the proposed temperatures and pressures of a black hole. There simply isn't enough space for electrons, protons and neutrons to exist as separate particals.

This from the layman at 60 years old and more or less ignorant in cosmology and astrophysics.
Paul

thehindmost

So in other words no charge would exist in the actual singularity, so the merger would work just like 2 normal black holes colliding, not creating a matter/anti-matter explosion?

Frame Dragger

The BH as a whole can have charge, but I don't know that you can make any inference about the singularity. Meanginful understandings of physics END at the Event Horizon. Two BHs with opposite charge will merge into a single BH... there is nothing to annihilate.

typical guy

It seems likely that they would annihilate one another to my layman understanding (other than the fact that no one understands the physics inside of a black hole). That said, isn't it kind of irrelevant since the time distortion caused by the incredible speed relative to the observer would make this type of impact take a nearly infinite amount of time relative to us?

bapowell

Whether or not time dilation prevents an outside observer from ever seeing the merger complete, the black holes do still collide, making the details of this collision important in the frame of the black holes. However, as emphasized by others in this post, it makes no sense to speculate on the collision of singularities -- which most probably don't exist. Frame Dragger...why is your name crossed out all of a sudden? Did you kill someone?