Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Black Holes Schwarzschild radius

  1. Jul 14, 2011 #1
    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 :<
  2. jcsd
  3. Jul 14, 2011 #2


    User Avatar

    Staff: Mentor

    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.
    Last edited by a moderator: May 5, 2017
  4. Jul 14, 2011 #3
    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?
    Last edited by a moderator: May 5, 2017
  5. Jul 14, 2011 #4


    User Avatar

    Staff: Mentor

    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.
    Last edited by a moderator: May 5, 2017
  6. Jul 14, 2011 #5
    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!
    Last edited by a moderator: May 5, 2017
  7. Jul 14, 2011 #6


    User Avatar
    Science Advisor

    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).
  8. Jul 15, 2011 #7


    User Avatar
    Science Advisor
    Gold Member

    A black hole is a well known consequence of well known physics. The BB 'singularity' is a horse of a different color. It's like comparing apples to pineapples and concluding they must somehow be related. If you start with the premise infinity = 1/0, the error is merely compounded by deducing infinity x 0 = 1.
    Last edited: Jul 15, 2011
  9. Jul 15, 2011 #8
    A well known consequence of well known physics with an eventually "impossibly" predicted outcome of a singularity as eventually well known physics and GR fails? I fail to see the point you are making; I acknowledge they are not the same, but some of the environmental conditions are very similar? After all a banana and pineapple are related - theyre both fruit! I am not being flippant just looking for more understanding.

    Thanks in advance
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Black Holes Schwarzschild radius
  1. Black hole radius (Replies: 2)

  2. Radius of a black hole (Replies: 12)