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Originally Posted by Nesti
I remember reading somewhere that some models of the Inflatory period just after the Big Bang, include the merging of higher dimensions with spacetime to form a single unit; so as temperatures get hotter, dimensions merge into one singular entity.
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I've never heard of this definition of inflation before.
Inflation is the metric expansion of space-time, except it happened a lot faster when compared to the metric expansion of the Universe.
Metric expansion is defined as the scale of the Universe changing. Each point in space-time is fixed while the scale increases.
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So, if we could run the Big Bang in reverse, wouldn’t everything be Lorentz Contracted, both in direction traveling to the origin and perpendicular because of the convergence of matter, so that all frames of reference ultimately contract into dimensionless points?
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Lorentz contraction is a property of SR for objects travelling
in space-time. Here it is space time itself that is changing.
In the Universe's frame of reference (Robertson-Walker space), an object is being carried along by the Hubble flow, it's not moving in space-time, hence Lorentz contraction doesn't occur.
In the observer's frame of reference for any point in the Universe, lorentz contraction will not be observed either as any object approaching the observer will be in the same direction as the observer's line of sight.
Regards
Steven