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Author Topic: Could we calculate the diameter of the universe at the moment of the big bang?  (Read 7563 times)

Offline QuantumClue

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Quote from: QuantumClue
physics necesserily breaks down at the singularity
Obviously a singularity can exist in theory, but has anyone established that it is a physical possibility? 

Yes.
 

Offline Pikaia

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Surely, by its very nature, an infinity must be everywhere, and include everything; unless you are talking about a Cantor type mathematical infinity, which is a very different "creature".

The centre of a black hole is a singularity which has infinite density and zero size (to a first approximation). So a singularity need not occur everywhere, but the BB singularity did.
 

Offline Olympus

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Quote from: Bill S on 15/11/2010 22:36:47
Quote from: QuantumClue
physics necessarily breaks down at the singularity
Obviously a singularity can exist in theory, but has anyone established that it is a physical possibility? 
Yes.
Is that yes a singularity is proven possible. I don't think so.
Current opinion on the universe creation is speculative. However i will accept a big bang event occured from the decay of an ancient universes dark matter collapse. When a universe eventually disperses far enough into (space*) it is reduced to dark matter ( dark matter is made up of base sub atomic elements fragments of atoms ) clusters with minimal gravitational forces. All matter whatever it is will eventually decay to sub atomic components. When the (dark) matter attractive forces exceed the expansion gravitational forces the universe collapse begins. However not all matter is consumed. This is not unlike a black hole however a black hole occurs in an active galaxy in our universe. The collapse event consumes a different type of matter which in theory creates this singularity event. When the explosion occurs (big bang) the energy release is unimaginable in size and triggers development of galaxies from the remnants of a much older universe. The varieties of these remnants gives us today the many different galaxy types which if you think about it explains a lot.  These remnants form galaxies of all different types and shapes and would give evidence that the contents of our universe is older then the singularity event itself. One day to be proven. My interest is more on the period prior to the universe creation.
 
 

Offline QuantumClue

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Quote from: Bill S on 15/11/2010 22:36:47
Quote from: QuantumClue
physics necessarily breaks down at the singularity
Obviously a singularity can exist in theory, but has anyone established that it is a physical possibility? 
Yes.
Is that yes a singularity is proven possible. I don't think so.
Current opinion on the universe creation is speculative. However i will accept a big bang event occured from the decay of an ancient universes dark matter collapse. When a universe eventually disperses far enough into (space*) it is reduced to dark matter ( dark matter is made up of base sub atomic elements fragments of atoms ) clusters with minimal gravitational forces. All matter whatever it is will eventually decay to sub atomic components. When the (dark) matter attractive forces exceed the expansion gravitational forces the universe collapse begins. However not all matter is consumed. This is not unlike a black hole however a black hole occurs in an active galaxy in our universe. The collapse event consumes a different type of matter which in theory creates this singularity event. When the explosion occurs (big bang) the energy release is unimaginable in size and triggers development of galaxies from the remnants of a much older universe. The varieties of these remnants gives us today the many different galaxy types which if you think about it explains a lot.  These remnants form galaxies of all different types and shapes and would give evidence that the contents of our universe is older then the singularity event itself. One day to be proven. My interest is more on the period prior to the universe creation.
 

No the yes is in reference to ''is it possible the singularity is infinitely dense'' so it would have a physical reference - GR also permits a proof if you like that the theories will end up using singularities.
 

Offline Bill S

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If a specific singularity is infinitely dense, can there ever have been a time when that singularity was not infinitely dense?
 

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