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The Big Bang is a Coordinate Singularity for $$k = -1$$ Inflationary FLRW Spacetimes
We show that the big bang is a coordinate singularity for a large class of $k = -1$ inflationary FLRW spacetimes which we have dubbed 'Milne-like.' By introducing a new set of coordinates, the big bang appears as a past boundary of the universe where the metric is no longer …