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Can spacetime be created ? if yes how if not why ?

  1. Jan 4, 2010 #1
    Can spacetime be created ??? if yes how if not why ???

    I understand that spacetime is not physical and more of geometry.
    Still bec it exist virtualy ,as gravity depends on warping of spacetime.
    So can we ever create this spacetime , does it existing before big bang ??
     
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  3. Jan 5, 2010 #2

    bcrowell

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    Re: Can spacetime be created ??? if yes how if not why ???

    In the current cosmological models, the cosmological constant is small enough that a singularity occurs at the big bang. This singularity represents a point where general relativity breaks down and loses self-consistency. Therefore we don't have any theory that allows us to say whether there was time before the big bang.

    If the universe is spatially closed, then its spatial volume is finite and increasing over time.

    If the universe is spatially open, then its spatial volume is infinite, so we can't really say whether the total volume increases over time. For a discussion of whether space should then be considered as expanding, see section 7.2.3 of http://www.lightandmatter.com/html_books/genrel/ch07/ch07.html#Section7.2 [Broken] , or, for more detail, http://arxiv.org/abs/0808.1081v2 and http://arxiv.org/abs/0707.0380v1 .
     
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  4. Jan 6, 2010 #3
    Re: Can spacetime be created ??? if yes how if not why ???

    newton said that two masses attact each other but no one know why and how..
    decades after A. Einstien said masses curve spacetime and puposed theory of GR.
    though his theory seems to be correct at the moment but again no one knows

    1) why mass curve spacetime ?
    2) can spacetime be created or destroyed ?
    3) how time is created in spacetime and why it changes dependiing on curvature of spacetime ?

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  5. Jan 6, 2010 #4

    Nabeshin

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    Re: Can spacetime be created ??? if yes how if not why ???

    1) This question has the tone of philosophy, not science. You can keep asking "why?" forever, and science will not be able to provide an infinite string of answers. We've got to start somewhere.


    2) This question, to me, is about as meaningful as asking "Can a cartesian coordinate system be created or destroyed?" or "Can the number two be created or destroyed?"

    3) This one confuses me. Time is changed by the curvature of spacetime precisely because spacetime is just that: space AND time. So when spacetime curves, space and time both warp.
     
  6. Jan 7, 2010 #5

    bcrowell

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    Re: Can spacetime be created ??? if yes how if not why ???

    Have you looked at the three links I gave?
     
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