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Big Bang question

  1. Aug 31, 2009 #1
    Is this a true statement regarding the Big Bang?

    "The BB is not that matter and energy ’exploded’ It is that matter and energy came into existence, along with time and space."

    I'm in the middle of a discussion, and someone said that, and it struck me as wrong, but I thought "what the **** do I know?" so I came here.

    BTW, i'm not really knowledgeable about physics, but I love you guys and what you do. I'm so sorry the physicist always dies in the science fiction films!
     
  2. jcsd
  3. Aug 31, 2009 #2

    mathman

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    The big bang theory is on pretty firm ground about what happened a small fraction of a second after it happened. The origin of the bb is still an open question.
     
  4. Sep 1, 2009 #3

    Chronos

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    The statement is correct, no 'explosion'.
     
  5. Sep 2, 2009 #4
    But to say that "matter and energy came into existence [with the Big Bang]"? That seems like an unsupportable claim to me, essentially because of the situation mathman described.
     
  6. Sep 2, 2009 #5
    I think that most people simply get confused when they hear that the early universe experienced explosive, i.e. rapid or exponential, growth and then infer an actual explosion occurred. The phrase "Big Bang" also contributes to this confusion.
     
  7. Sep 3, 2009 #6
    Ya, ignore the 'explosion' part. I understand that it wasn't a literal explosion.

    I'm more wondering about time and space coming into existence with the big bang.
     
  8. Sep 17, 2009 #7
    I am confident that while some of the largest minds allow it as a possible reality that something could come from nothing (i.e. time and space could 'come into existence'), that that would involve us in definitions of the words 'something' and 'nothing' which would break down and actually point out the fallacy of believing that 'something can come from nothing'.

    Not to become philosophical, but as many of us on this forum know, physics becomes math in the final analysis, yet math is not the final frontier.

    Entertain for a moment that science is not the explanation of things, it is the description of things. Only some nearly-unthought-of-yet philosophy can explain how and why the universe exists. Science/math can then learn to describe (and predict) everything else from there.

    To say that the universe is, remands the discussion to an admittance that it has always been. Otherwise, the definitions of the words involved become folly.
     
  9. Sep 18, 2009 #8

    Chronos

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    Something from nothing remains a viable explanation, semantics aside. The apparent fact the universe had a 'beginning' suggests an 'a priori' state. Whatever state that may have been is unknown. It might be more palatable to portray it as a universe from the 'unknown'. I agree with that characterization for now.
     
  10. Sep 20, 2009 #9
    Hey there guys. Yeah I pretty agree with what you are saying mathman. tha was the planck's time 9 approximately 10^-43 seconds after the big bang. i think I will gpo with the creation of matter and energy. The energies were probably created from vacuum fluctuations. The energy density wich is a good source of matter gave rise to the particles. Infact, this is a very good time to postulate that all the forces existed as the same since the energy was large enough to keep the symmetry between the forces.
     
  11. Sep 20, 2009 #10
    Well, Laser physicists never die - they just become incoherent!
     
  12. Sep 23, 2009 #11
    I am kind of confused by this myself. A site called big bang theory.com says:

    http://www.big-bang-theory.com/" [Broken]
     
    Last edited by a moderator: May 4, 2017
  13. Sep 23, 2009 #12
    big bang wasnt an explosion, however it was the expansion of time and space into existance.
     
  14. Feb 25, 2010 #13
    That's a nice statement by Hawking and crew, but it is intuitively obvious that if "nothing" existed prior to the singularity, then the word 'prior' has no useable meaning. That is a conundrum. Therefore something is wrong with the nice statement.
     
    Last edited by a moderator: May 4, 2017
  15. Feb 25, 2010 #14
    But you can't PUT sematics aside. That's a bugaboo. If 'something' and 'nothing' have real meanings, then something cannot come from nothing. If they cannot be ascribed real meanings which can be used to deduce, then mathematics has the same problem.
     
  16. Feb 25, 2010 #15
    very confusing :)
     
  17. Feb 25, 2010 #16
    That's correct. In other words, the big bang was a metaphor for what really happened (is happening).
     
  18. Feb 25, 2010 #17
    then what is the correct statement to make about the big bang?
     
  19. Feb 25, 2010 #18
    Hopefully it is obvious that math (and physics) can never tell us about how "things came about", but rather can only be used to describe and predict.

    The origin of things, if deducible at all (which it is), is only apprehended conceptually.
    Let's call it mental-physics.

    For understandability and believability, let's remember the important gist of what the quantumists are learning- #1 that things aren't what they seem from here and #2 the nature of events/matter seems somehow to be influenced by the observation/observer.

    The correct statement to make about the big bang is not so much that it is a 'creation', but that it is the original observation of matter.

    What was the original observation of matter? Mental.

    There is more to it than that. :)
     
  20. Feb 25, 2010 #19
    I got a question for you guys. If the BB wasn't an explosion then what is the MBR(microwave backround radiation) all about?
     
  21. Feb 25, 2010 #20
    yes, big-bang was not an explosion it's an initial point where the universe began to expand, and created some sort of energy to build this universe
     
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