'Big Bounce' theory may be testable?

Discussion in 'Astronomy, Exobiology, & Cosmology' started by river-wind, Dec 12, 2008.

  1. river-wind Valued Senior Member

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    So the question is: "If there was no singularity, then how does gravity within the singularity work?"
     
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  3. LogicTech Registered Member

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    A singularity is just a mathematical construct. Any we find in our physical theories just reflects the fact that our current models are inadequate for describing what goes on under those conditions. That's why we are working on a Theory of Everything, to eliminate those nasty singularities in our equations.
     
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  5. TruthSeeker Fancy Virtual Reality Monkey Valued Senior Member

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    Here's a thought.....


    If you compress an accordion, there's a limit to the smallest size the accordion can be compressed to. So what if there's a limit for matter too, to such an extent that gravity could not make it any more compact?

    In the same though, why is gravity always thought of as an internal force pushing everything from within? Why can't gravity be a force outside the universe, pulling the universe? And why can't dark energy follow the same principle?
     
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  7. quantum_wave Contemplating the "as yet" unknown Valued Senior Member

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    Your thought made me think ... I think your Purple elephants flying idea was better. The accordion analogy ... OK, maybe it is better than the elephants thing, but then you go on to say gravity is thought of as an internal force pushing out. I always thought of gravity as a pull force. Not only that, but if you reference General Relativity, gravity is caused by mass bending spacetime so it is neither a push or a pull; it is more of a "fall in the well".

    However, that leaves your last thought, "Why can't gravity be a force outside the universe, pulling the universe?" No, it won't fly. Stick with the purple elephants flying

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  8. kaneda Actual Cynic Registered Senior Member

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    LogicTech. A singularity was the original idea. A naked black hole without the annoying properties of a black hole which would stop it expanding. Infinity is a mathematical construct too and just as impossible.
     
  9. kaneda Actual Cynic Registered Senior Member

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    Truth Seeker. The biggest black hole found so far is a mere 18 billion solar masses and that probably has elementary particles inside it. There is no way of even guessing at what point an electron, quark or something far smaller breaks down completely into energy.

    Gravity is a pulling force and not a pushing force which I think is what you meant. Gravity comes from massive and dense objects. The more massive or dense something is, the more the gravitational pull. As the force of gravity travels at just light speed, it must be a "local force" to work and be detected.

    Dark energy is an anti-gravity force, something that not much more than a decade ago was said to be impossible.
     
  10. TruthSeeker Fancy Virtual Reality Monkey Valued Senior Member

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    Kaneda, how do you know gavity is a pulling force?
     

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