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Originally posted by Hawking
reply to post by XPLodER
When I saw the thread title I was sure you were the author lol
Always enjoy your posts/threads very much
Conjecture #1
That may mean that the birth of our own universe may have been as a bubble inside another, older universe.
A concept known as vacuum instability could result, billions of years from now, in a new universe opening up in the present one and replacing it.
It doesn't bother me that much. If you ask "what is our universe expanding into" which is a commonly asked question, the answer is nobody knows because we can't see beyond our universe. How do we know it's not expanding into the remains of a prior universe, if the energy levels in the prior universe are so low that it's almost like nothing is there? I don't think we understand the properties of space well enough yet to give a reliable answer, since quantum field theory predicts high energy levels in space that are not observed.
Originally posted by angryhulk
reply to post by Chronon
This quote bothers me.
A concept known as vacuum instability could result, billions of years from now, in a new universe opening up in the present one and replacing it.
I thought the expansion of our universe was speeding up? So in principle our universe could never be fully replaced (much like a couple of your examples listed above) given the 'new' universe should adopt the same laws that applied within our universe, as it is within our universe from the beginning.
Originally posted by Chronon
That's a lot of "ifs" but if it did happen we would effectively have a new universe, somewhere inside of our own. Just to make it simple, let's place the bubble in the center of our universe and assume it is expanding in all directions at the speed of light. One would assume that as the boundary of the bubble collided into the stars and galaxies of our own universe there might be some expenditure of energy, a bang or a explosion if you will.
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