BlackHoles

[GeneralVeers]

Well ive done some research and have studied this topic a little bit, but ive always wondered what happens when matter gets sucked into a black hole.

I did a complete read-through of the thread just to be sure--and as I suspected, everybody in this thread was wrong.

The surprising answer, Mokie--is that the matter NEVER ACTUALLY GETS SUCKED IN! In fact, from our reference frame, that's impossible.

As an object falls deeper into a gravity well, time slows down; a clock sitting on the surface of Earth runs slower than one in orbit. As you watch a chunk of matter falling towards the event horizon of a black hole, you see it fall more and more slowly--and stop just before reaching the event horizon (that's assuming you could see it, but the intense gravity would red-shift the light from the object into the infrared range). From your viewpoint, anything falling towards a black hole would take an infinite amount of time to cross the event horizon.

So the real truth is: nothing that has ever been captured by any black hole, anywhere in the Universe, has actually fallen in. All matter and energy captured by all black holes is forever frozen in spacetime, just above the event horizon of whatever black hole captured it. And there's no actual singularity, of infinite density, at the center of any black hole--such a thing would take an infinite amount of time to form.

People always say that its gone and it doesn't exist anymore.

It does exist, we just can't ever get to it any more. All information about what kind of matter it was, what planet it might have been, who might have lived on that doomed planet--is lost forever. Only three items of information remain: its mass, its electrical charge, and its angular momentum.

There has also been some speculation that black holes are like wormholes and can transport you to alternate dimensions or other universes.

This is more than mere speculation; it may actually be possible. If a black hole is rotating (as most of them probably are, due to conservation of angular momentum) or carries an electrical charge (same deal), there are mathematical solutions which allow you to avoid the center, orbit around it, and exit at a different point in spacetime--and some of these solutions DO lead to the past! But this is all theoretical; the math says its possible, but the laws of physics say it would be one hell of a job to create the technology to survive the trip.....

[K^2]

This is more than mere speculation; it may actually be possible. If a black hole is rotating (as most of them probably are, due to conservation of angular momentum) or carries an electrical charge (same deal), there are mathematical solutions which allow you to avoid the center, orbit around it, and exit at a different point in spacetime--and some of these solutions DO lead to the past! But this is all theoretical; the math says its possible, but the laws of physics say it would be one hell of a job to create the technology to survive the trip.....

These solutions have been shown to be unstable. Nobody really knows what an interior of a Kerr black hole is like.

[GeneralVeers]

Yup. Unstable. But then, "unstable" doesn't mean "impossible".

Actually, it doesn't mean "possible" either......

You know what, I need to go take a nap, I'm getting a headache.

[YNM]

It's clear that the main problem is lack of observational datas to support them, those heavy to understand, heavily protected, highly on fire, theories. As Murphy (film) says, "out there ? A black hole. But stuck down here on Earth ?"

[NeatCrown]

A black hole is a mass that has a surface gravity greater than c (roughly 300,000,000m/s). You're right about wormholes, but they'd be around the black hole itself, causing Hawking radiation. Any black bole will lost mass over time if not continuously replenished.

Beyond that, all we can do is speculate until we have a better mathematic model of gravity. There's no way to observe what happens inside a black hole. We can see its effects on other energy though. It bends light, and outright captures it; hence the name "black hole"

Also, think of gravity as a blanket/sheet. When you put a ball on it, it'll create a ditch. Place another object, and both masses will be "attracted" to each other, even though they're just falling into the well the other mass creates. It's a gravity well.

[Rakaydos]

in theory, a wormhole might connect two points in space via a significantly shortier distance. However, if a wormhole has an event horizon, it's useless- you can go in, but you cant come out the other side- it's effetively just two black holes with anomalus mass growth.

My headcanon for darkmatter is that since gravitons are theorized (in string theory) to be unbound to our 4 dimentional slice (membrane) of a larger set of dimentions, Dark Matter is actually the gravity of mass in another nearby 4 dimentional membrane. It doesnt exist in our 4d universe, interacting only through gravity.

[K^2]

gravitons are theorized (in string theory)

And that's already a problem, since string theory has made a whole bunch of predictions that haven't panned out.^*

By the way, what you're looking for is called a traversable wormhole. No known stable traversable wormhole configurations are known that do not require exotic matter.

^* Although, pretty much any theory with more than 4D, be it branes, holography, or what have you, would have gravitational interactions that go beyond 4D as well. Problem is, we've found no indication of this on microscopic level, and it's very difficult to imagine a system where this would have macroscopic effect equivalent to dark matter without detectable microscopic consequences.

Edited August 1, 2015 by K^2

[AngelLestat]

By the way, what you're looking for is called a traversable wormhole. No known stable traversable wormhole configurations are known that do not require exotic matter.

.

From what I read, wormhole are only possible with exotic matter, and none of those configurations are stable.

Maybe is the same thing that you wanna said.

[K^2]

From what I read, wormhole are only possible with exotic matter, and none of those configurations are stable.

You've misread. Wormhole is a topological feature. You either have one or you don't. You don't need any special conditions to have a stable, non-traversable wormhole. Likewise, there are known, unstable traversable wormhole configurations that do not require exotic matter. It's only if you want stable and traversable that there are no known configurations that do not require exotic matter. However, there is no general proof showing that exotic matter is a necessary condition even for these. Just conjectures based on known configurations.

[AngelLestat]

ok. I will take your word. Thanks for the clarification.

[PB666]

You've misread. Wormhole is a topological feature. You either have one or you don't. You don't need any special conditions to have a stable, non-traversable wormhole. Likewise, there are known, unstable traversable wormhole configurations that do not require exotic matter. It's only if you want stable and traversable that there are no known configurations that do not require exotic matter. However, there is no general proof showing that exotic matter is a necessary condition even for these. Just conjectures based on known configurations.

At the quantum scales there are infinite possibilities, accumulating these effects is where fantasy gives way to reality.

[ZetaX]

At the quantum scales there are infinite possibilities, accumulating these effects is where fantasy gives way to reality.

Umm... that is not even technobabble but pure "I dream that all my wishes can become real"...

Definitely not a reasonable scientific claim.

[PB666]

Well I guess this video half answers the OP's question.