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Black hole in one universe to generate a big bang

  1. Oct 30, 2009 #1
    I have a few questions and I was hoping you guys could help

    One, would it be theoretically possible for the creation of a black hole in one universe to generate a big bang/white hole creation of another universe, kind of shifting matter and energy from one universe to create another.

    Two, if universes are expanding and there are an infinite number of universes, is it possible for universes or dimensions within the universes to come into contact, and what would occur if two universes happened to come into contact.

    If there are an infinite number of universes, then isn't it possible, that each universe is one instant in time, and that all moments in time, and all possible moments in time exist at once, basically all possible pasts, presents and futures exist at once.
  2. jcsd
  3. Oct 31, 2009 #2
    Always willing, not always helping though.

    White-holes are very tricky to achieve in practice, but are a lot like the Big Bang in some ways. Our Universe might have sprung from one. But there's no evidence that black-hole singularities emit matter from them after crushing it to oblivion. Wormholes might be stabilised by the insides of black-holes allowing stuff to pass through, but there's no guarantees it does.

    It is possible and stuff would spill from one into the other. Such a zone of contact between Universes would probably appear as patch in the Cosmic Microwave Background that's different to the average even temperature.

    Yes. If there are an infinite number then some fraction (very small) will all be starting with the same initial conditions and the same physical laws, thus evolving - probably - in parallel, albeit at different starting times (hyper-times?) It's also possible that - if our Universe is infinite - then there are an infinite number of duplicates of our present Earth, all past Earths, all future Earths and all possible Earths. They're also very, very far away. Like double exponential numbers away. Max Tegmark has written extensively on this idea, so look for his papers on the arXiv.org site.
  4. Oct 31, 2009 #3
    thanks, these were some questions I had rolling around in my head, but didn't have the educational background to answer (the social sciences are more my bag)
  5. Nov 1, 2009 #4


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    Lee Smolin thinks black holes can form new universes in the manner you suggest. See his cosmic natural selection hypothesis. I doubt this is viable, but, he is the theoretical physicist, not I.

    2. Im not sure how bubble universes could come into contact. If they exist in different bubbles, I think the bubbles must exist in different dimensions in some kind of hyperspace. There is no evidence of other universes encroaching into our space in WMAP, as qraal noted.

    3. You cannot inject universal time into this equation, they must each 'live' in their own time-space. A universe without an exclusive time-space continuum is unviable, imo.

    I think this is a failed hypothesis because there are no apparent observables that allow us to test it. It might be true, but, without observables, it is meaningless in our universe.
    Last edited: Nov 1, 2009
  6. Nov 1, 2009 #5
    Why do you think it is inviable?

    Why would they exist within different dimensions, wouldn't all the universes have the same number of dimensions? (what is it now 11, 26?)

    But if there are an infinite number of universes, wouldn't each possible state of existence be present at all times in some universe? Therefore wouldn't every possible moment in time also be present, since every moment in time is a possible state?

    Isn't all of this stuff untestable anyways? I mean no one has proven that the multiverse exists, as far as I am aware.
  7. Nov 2, 2009 #6


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    The unprovable part is my objection. Other universes existing in our spacetime would surely exhibit traces in WMAP, unless they conspire to blend into the CMB of 'our' universe. That seems either highly improbable or irrelevant to me.
  8. Nov 2, 2009 #7
    Well that just may mean we haven't come into contact with another one, not that we cannot
  9. Nov 3, 2009 #8
    Indeed. But it does provide a lower bound of zero for nearby universes. It might remain that way.
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