Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Il Palazzo]

Is it possible for a black hole to NOT be a point source?

It can be a source no bigger than the radius of the black hole itself, so no, you can't magically create a radius where light couldn't escape by placing a lot of objects around one place.

What do you mean? The Schwartzschild radius grows faster than the radius of a uniform sphere as you keep adding mass. Once you get enough mass concentrated in small* enough volume the event horizon is created and (classically, static black holes only!) everything contained within must end up in the singularity.

*If you had a blob of air the size of the Milky Way, it'd form an EH.

The thing to remember here is that singularity is not a physical thing. It's an indication, as clear as any, that you can't use a theory to describe this particular domain.
So there is almost certainly some other physics governing the behaviour of matter inside the event horizon, and the aliens could be very well privy to it.

That still leaves the silliness of using a sonic screwdriver or whatever thingamajigar they've got to stop a stellar core from doing its thing.

[forsaken1111]

Yeah, in the book they had an alien whatsit that allowed them to penetrate the event horizon but once inside they acted as if everything was fine and dandy, they had habitable planets orbiting suns inside the event horizon created by the mass of the stars.

It all felt a bit silly.

Then there was the Kugelblitz 'black hole formed not by matter but by sufficient concentration of energy' weirdness in which godlike energy beings lived.

[Putnam]

The size of the swarzchild radius increases linearly with mass, so yeah, black holes can get pretty wonky.

For example, the observable universe's swarzchild radius given its mass is 13.7 billion light years, which gives us a density of, oh, pretty much exactly the universe's density. Wonky.

[Sergarr]

The size of the swarzchild radius increases linearly with mass, so yeah, black holes can get pretty wonky.

For example, the observable universe's swarzchild radius given its mass is 13.7 billion light years, which gives us a density of, oh, pretty much exactly the universe's density. Wonky.

Wouldn't that mean that we're all in a giant black hole?

Where's the singularity, then?

[Putnam]

I said it was wonky, not that it was indicative of anything

[Gentlefish]

Well, I suppose to put it another way, we're not escaping our observable universe any time soon

[Sergarr]

Well, I suppose to put it another way, we're not escaping our observable universe any time soon

You can always took a plunge into a random black hole

[Descan]

The size of the swarzchild radius increases linearly with mass, so yeah, black holes can get pretty wonky.

For example, the observable universe's swarzchild radius given its mass is 13.7 billion light years, which gives us a density of, oh, pretty much exactly the universe's density. Wonky.

Wouldn't that mean that we're all in a giant black hole?

Where's the singularity, then?

This is nothing scientific, as far as I know, it's a story along the same lines as the Egg story

But there is the idea that black holes are basically universal reproduction. Each black hole has a universe inside it, which has more black holes which have more universes, down the chain.

So we'd be inside a black hole of another universe that was upwards the chain from us.

[Gentlefish]

Actual scientific hypothesis: We exist upon the 3D membrane of a 4D black hole. Black hole membranes in our dimension are 2D.

[hops]

But is the black hole we exist in, exist upon the 4D membrane of a 5D black hole?

We need to go shallower

[Sergarr]

Actual scientific hypothesis: We exist upon the 3D membrane of a 4D black hole. Black hole membranes in our dimension are 2D.

What if something exists in a 1D membrane of a 2D black hole, would they have 0D black holes membranes?

[hops]

Uh, yeah?

I mean, the black hole itself would be a line on the 1st dimension, so the exterior part would be zero-dimensional dots.

[Sergarr]

Uh, yeah?

I mean, the black hole itself would be a line on the 1st dimension, so the exterior part would be zero-dimensional dots.

but then would people on 0D memrane have -1D black hole membranes?

[hops]

I can't even imagine what the surface of a dot look like.

[Frumple]

...

. <----