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Thread: the big bang cycle

  1. #1 the big bang cycle 
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    I am new to this site and I will be the first to admit that my maths and physics are not at all strong, so I am fully prepared to be 'shot down'.
    My observations of nature are that just about everthing has a cycle, yes I appreciate that countless extinctions of individual species are ongoing all the time, but never the less cycles are always present in all aspects of nature.
    I find 'the beginning of time' a difficult concept to understand, how did we move from the moment before time started (of course if it was before time started then there was no moment) to the beginning of time itself? I am exploring the possibility that the universe itself has a cycle and that a big bang happening is a regular event. I have more than one idea of how this could work, but I will leave that for later discussion.


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  3. #2  
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    Nobody knows enough to answer your questions. An oscillating universe is one of several models that have been postulated.

    http://en.wikipedia.org/wiki/Oscillatory_universe


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  4. #3  
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    rmz450. The idea has been around a long time. A problem with the big bang is that it will produce mostly hydrogen and as the universe is rapidly expanding, this stands little chance of combining sufficiently to form stars. However if there is a rebound before the universe fully collapses, then there is plenty of material around which the new universe can quickly form, so form stars, etc early in it's life.

    A slant on the idea:


    http://www.newscientist.com/article/...sref=cosmology


    The idea has a major fault in it in that as soon as the universe starts to rebound, it goes below a certain density again and gravity starts functioning again, causing the universe to collapse again. This little dance goes on forever.
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  5. #4  
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    Thank you for the link Cyberia. Although I must admit that I don't understand most of the technical content, it's good to see that something that I have felt is much more plausable than the popular thinking of the big bang coming from nothing, and before which time did not exist, is being taken seriously by others. As I mentioned in my original post my maths, and physics are very basic (I also believe that it's possible that both maths and physics may only work 99.99............% of the time, and that the remaining infinitely small percentage they break down and cannot be relied upon). Crazy perhaps, but one thing is for sure, the universe is a strange and wonderful place, where I don't think anything can be ruled impossible.
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  6. #5  
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    Cyberia, what you're talking about at the end is called Loop Quantum Gravity, or LQG. Basically what LQG says is that as you pack more and more energy into an area, eventually space runs out of room. As you pack even more energy in, space will push it back out. Thus, the gravity in that region has turned from an attractive force, to a repulsive on. LQG also states that space is like a mesh of tiny 'atoms' instead of a continuum, like what the relativity theory assumes. I just posted a thread called The Big Bounce which is a new theory based on the principles of LQG.
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  7. #6  
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    In nature straight lines do not exist, my understanding is that even the strongest laser beam will eventually fragment with distance.
    Is it not possible that following a big bang type event, that all the matter will be flung out on a massive arc? Early on in the cycle (now) objects would be moving away from each other, but eventually towards the end of the cycle they would return to the point from which they begun. This then leads me to think that there could be two points at which the death/rebirth takes place as everthing would collide again at a point halfway through one orbit.
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  8. #7  
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    Quote Originally Posted by rmz450
    In nature straight lines do not exist
    That's the space-time view, that the universal "fabric" is fundamentally wonky and the wonkiness itself causes curves, as opposed to the old view that things only curve because other things act on them.
    a massive arc?
    Sure if you wanna put some inherent spin on spacetime. But I think common sense would like a concurrent and material manifestation of that, so now your "everything" just got a lot larger and more complex than singularity. Otherwise we could just call space-time hokus-pokus.
    A pong by any other name is still a pong. -williampinn
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  9. #8  
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    It may help to explain my thinking by using hypothetical reference points:-
    'north pole'/'equator'/'south pole'.
    Imagine the universe is at it's most dense state in it's cycle and is situated above the 'north pole', it's still vast and has not reached the point of collapse, but a percentage of the bodies within it collide giving birth to new stars and distributing the building blocks for life. All the matter within the universe is now travelling towards the 'equator' and therefore is expanding. On reaching the 'equator' maximum expansion has been reached and the universe now goes into contraction mode as it heads toward the 'south pole'. On reaching the 'south pole' the situation is the same as it was at the 'north pole' and so the cycle continues. Please do not think of the reference points as structures, they are just locations. I am sorry if I'm just reapeating ideas that have been put forward before, I really don't know.
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