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Did an explosion of a Black Hole make the Big Bang

  1. Jan 28, 2016 #1
    I'm not talking about white holes. Indeed, the big bang as the explosion of a black hole are an explosion of singularity.
     
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  3. Jan 28, 2016 #2

    Chronos

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    An 'exploding' singularity? How might that happen? This is the kind of confusion Fred Hoyle probably envisioned when he coined the term 'big bang'?
     
  4. Jan 28, 2016 #3
    There is no known mechanism which would cause a black hole to explode, and no reason to expect that there could be one.
    Even colliding black holes will only produce a bigger back hole.
     
  5. Jan 28, 2016 #4
    At the beggining there was a singularity, then, the singulary expanded. So it can't be an explosion?
     
  6. Jan 28, 2016 #5

    Drakkith

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    A singularity is not an object that can expand. It's not really an object at all.
     
  7. Jan 28, 2016 #6
  8. Jan 28, 2016 #7
    At the first there was singularity, then,from that, there is the universe. Then, singularity may experiment some change,don't?
     
  9. Jan 28, 2016 #8

    PeterDonis

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    Yes, you are. A white hole is the time reverse of a black hole; that means an "exploding black hole"--with a singularity in the past instead of the future--is a white hole. And white holes are agreed by physicists to be unphysical, because there's no way for them to form.

    No, there wasn't. The initial singularity is an artifact of a particular model; it's not something that cosmologists believe actually happened.
     
  10. Jan 28, 2016 #9

    Drakkith

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    Here's the deal. We have essentially no idea how the universe was created (if it was created at all) or what started the initial expansion. There are a few theories out there, but they are very, very speculative. Also note that the Big Bang isn't even a well defined event. Some use it to mean the birth of the universe, while others use it to refer to the rapid expansion of the very early universe.

    Also, a black hole, as the term commonly means, does not describe the state of the very early universe. If a singularity did exist at the beginning of the universe, it would not be inside a black hole because a black hole is a finite volume of space, inside of which all paths through spacetime lead to the center. The singularity in a black hole is, typically, a single point, not an extended object (though sometimes it can be). In contrast, the singularity at the beginning of the universe would have been everywhere. Every point in space (if space even existed) would have been a singularity.

    So the answer to the question in the thread title, can the big bang come from an explosion of a black hole, is simply, "No, it cannot."
    Now, whether or not the universe came from a singularity is a different question and one that is impossible to answer at this time.
     
  11. Jan 28, 2016 #10
    "A singularity is not an object that can expand. It's not really an object at all."
    Thanks! Now I have greater understanding of singularities.

    "So the answer to the question in the thread title, can the big bang come from an explosion of a black hole, is simply, "No, it cannot.""
    That depends on what you mean by an explosion and what you mean by a black hole. Doesn't the "big bang" look like someone opened a big can of ultra-relativistic matter? (A lot like opening a bottle of warm soda.)

    "Now, whether or not the universe came from a singularity is a different question and one that is impossible to answer at this time."
    Thats a hard question to answer especially for those who don't clearly understand what a singularity is. Reading more GR should help them.
     
  12. Jan 28, 2016 #11

    PeterDonis

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    The meaning of "black hole" is unambiguous, and that meaning does not apply to the Big Bang.

    Sort of; but it does not look like a black hole.
     
  13. Jan 28, 2016 #12

    Drakkith

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    Nope. It looks like bread rising more than it looks like opening a can of ultra-relativistic matter.
     
  14. Feb 11, 2016 #13
    Its relative. If you're an armchair distant observer it looks like bread rising but if you're up close its like opening a bottle of warm soda.
     
  15. Feb 11, 2016 #14

    Drakkith

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    There is no "up close". The big bang (the rapid expansion of space) took place everywhere and smoothly transitioned over time into the expansion we see/experience now.
     
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