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Three Important Questions (about black holes and the Big Bang)

  1. Dec 11, 2014 #1
    I have always wondered various questions, out of which these 3 below are on the priority list including a previous topic I questioned here ofcourse without any answer to it. I am no science guy by the way, just curious!

    So the questions are:
    1. Can a blackhole contain a wormhole inside of it?
    2. This is probably absurd, but do dimentions like 1D(point), 2D(line), 3D(sphere, cone) and so on has something to do with the single point (1D) from which the Big Bang happened, to the space expansion (3D), to time (4D) and so on...??
    3. Please Explain if this Picture , that I made yesterday makes any sense.

    Thanks for your time and bearing through all this stupid questions that I make!
    Last edited: Dec 11, 2014
  2. jcsd
  3. Dec 11, 2014 #2

    Doug Huffman

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    We cannot know. A wormhole is only hypothesized.
    A point is 0D, et cetera.
  4. Dec 11, 2014 #3
    It is point,line,plane,space,time 0-4 dimensions. (you left out plane)
  5. Dec 11, 2014 #4
    It would be more accurate in the picture for hot bang/ cold crunch at the intersection in infinite vector spaces.
  6. Dec 11, 2014 #5


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    I don't believe so, but I"m not sure.

    No, if nothing else because the big bang was not a single 0d point (points are 0d, lines are 1d). It happened throughout all of space at the same time.

    There is no relation between the symbol for infinity and your picture. None at all. Our symbol for infinity could have been nothing like a sideways figure 8 had things been different.
  7. Dec 11, 2014 #6


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    It's not a correct statement (even apart from the dimensionality of lines and points). BB did not happen as a 0D point. The dimensionality of the universe did not change throughout its history. If it's an infinite (possibly) 4D space-time now, it was so always, and BB happened in all of its 3D volume at some time in the past.
    The picture {2} seems to be aiming to show a "big crunch"* evolution, yet it is labeled heat death. Heat death is what you get if you let the universe expand forever until all the energy is evenly spread out as heat, and there is no more left to do any work - so, no more stars, radioactivity etc.
    And no, I wouldn't get hung on the shape of the infinity symbol. The "etymology" of the infinity symbol is unclear, but possibly relates to the shape of the number 1000 in roman numerals (http://en.wikipedia.org/wiki/Roman_numerals#Large_numbers) or the lower case Greek omega letter. Both having been often used to mean "many" "a whole lot" "a gazillion" etc. As such, it is completely arbitrary a choice, and to look for physical meaning it is a bit too much on the numerological side.

    *big crunch was a hypothesis that is by now thought to not represent reality, as recent observations of universe geometry by PLANCK and WMAP satellites point strongly to a flat universe.
  8. Dec 12, 2014 #7
    To get a deep answer to this question you should learn about Hawking's information paradox and entanglement, and look up the work of Leonard Susskind, Juan Maldecena, Joe Polchinsky, et al. First thing to notice is that the current understanding of a wormhole is that it could only be formed by two entangled black holes. Such an event is almost inconceivably unlikely but can't be ruled out. It is a special "two sided" black hole. You have a spacetime-like geometry connecting two regions of space whose boundaries on either side are event horizons out from which not even light can escape. The wormhole is a macroscopic Einstein-Rosen bringe. This means that if Alice jumps in one end and Bob the other, assuming they can survive the fall, they can meet in the center - but in no accepted models can anyone, not even light, go beyond any event horizon once they've past it.

    Thus one answer to your question is that a wormhole can *only* exist inside a black hole. Another answer might depend on your meaning, whether you're asking for instance if another entangled black hole pair can form within the event horizon of a larger black hole. I wouldn't be surprised if there were formal answers but 'm not sure what work has been done on the question. Alternately, there are speculations that this universe is indeed already on the inside of an event horizon or "other side" of a singularity, which if true, and there are indeed wormholes in this universe, then the answer to your question would be yes.
    Last edited: Dec 12, 2014
  9. Dec 12, 2014 #8

    Doug Huffman

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    165+ Susskind lectures streamed. He is a wonderful lecturer!

  10. Dec 12, 2014 #9
    Hey, thanks for all the replies. For the first question, I think we may never find a definite answer as we will not be able to research on a blackhole!
    The second question was indeed a wrong type of question. As for the third, thanks for explaining it. I will definitely read about the Hawking's paradox and entanglement.
    Hey thanks Doug, I will watch that video rightaway.
    I have further more questions about the birth of quarks, negative energy etc, but I shall only do so if you guys at PF permit me to ask all these overwhelming questions.
    For now, I have just these two questions I need to get some clue about!
    1. Someone once told me that we can find pores, crevices and holes on every surface, if we observe it microscopically. So, If time was a physical dimension would we find pores and holes on it too, could they represent wormholes or portals to different places?
    2. Does any one believe on the Paleocontact Hypothesis?
    Sorry for all these questions on a serious science forum, but I didn't know whom to ask!
    Thanks for all the replies!
  11. Dec 12, 2014 #10

    Doug Huffman

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    Time is NOT space-like.
    I do not.
  12. Dec 14, 2014 #11
    The ring singularity in a rotating black hole can be described as a throat to a wormhole (see attached image) with r=0 at the edge of the ring singularity and r being negative within (i.e. new space) but this is within the inner (Cauchy) horizon which is in itself hypothetical. You would also probably need a white hole to exit of which there is no evidence of existing. See also 'The Kerr Antiverse' on this page.

    Image from 'The Large Scale Structure of Spacetime' by Hawking and Ellis

    Attached Files:

  13. Dec 22, 2014 #12
    What occurred before big bang...big crunch ? May be in fact a cyclic condensing and expansion...It seems logical ...however quantum mechanics shows how wrong our common sense of logic actually is...lol
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