Is Schwarzschild radius trying to state the gravitational field on the event horizon of a black hole?
If not, what is it trying to state?

Can you give me a example using his formula to figure out the gravitational force of a black hole in the event horizon?

Do you have any links I can read about black holes and formulas? I'm very interested in them, tho they're scary :<

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Ryan_m_b
Staff Emeritus
Quoting wikipedia

The Schwarzschild radius (sometimes historically referred to as the gravitational radius) is the distance from the center of an object such that, if all the mass of the object were compressed within that sphere, the escape speed from the surface would equal the speed of light
In other words it tells you the radius of the event horizon. This http://xaonon.dyndns.org/hawking/" [Broken] can give you lot's of different information as well as providing you with formulae.

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Quoting wikipedia

In other words it tells you the radius of the event horizon. This http://xaonon.dyndns.org/hawking/" [Broken] can give you lot's of different information as well as providing you with formulae.
Out of curiosity is the black hole and/or event horizon a sphere (3D)? If we did go into a black hole, would it be insanely hot and bright since it would have been trapping heaps of photons?

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Ryan_m_b
Staff Emeritus
Out of curiosity is the black hole and/or event horizon a sphere (3D)? If we did go into a black hole, would it be insanely hot and bright since it would have been trapping heaps of photons?
It is a sphere yes. The inside of a black hole is a bit of a mystery, current theory predicts a http://en.wikipedia.org/wiki/Gravitational_singularity" [Broken] may tell us what really is going on inside a black hole.

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It is a sphere yes. The inside of a black hole is a bit of a mystery, current theory predicts a http://en.wikipedia.org/wiki/Gravitational_singularity" [Broken] may tell us what really is going on inside a black hole.
My hunch is that gravitational singularities do exist, but not from our frame of reference due to the immense reletavistic time dilation. Mapping of a finite observer time to an infinite coordinate time - there are theoreticals that refute the Event Horizon can ever be crossed.

I genuinely think that Black Holes provide the key to understanding the Big Bang, as theoretically a singularity encompasses many mathematical problems which can be associated with the initial Big Bang event. I am not stating they are the same as this is clearly not the case merely that intuition leads me to believe that Black Holes can be the physical subject we require to truly understand the origins of U.

As always we await grand unification!

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Nabeshin
Out of curiosity is the black hole and/or event horizon a sphere (3D)? If we did go into a black hole, would it be insanely hot and bright since it would have been trapping heaps of photons?
Well if YOU (a freely falling observer) fell past the event horizon of a black hole, you wouldn't notice anything out of the ordinary. In fact, you would have to be quite clever to discover you'd even passed the event horizon at all! (Other than potential tidal forces, but we'll assume that those are small enough so that you can't feel it).

Chronos