On 12/23/2018 4:47 PM, [email protected] wrote:
*If by "flat", you mean mathematically flat, like a plane extending infinitely in all directions, as opposed to asymptotically flat like a huge and expanding sphere, you have to reconcile an infinitesimally tiny universe at the time of the BB, and simultaneously an infinitely large universe extending infinitely in all directions. AG*
All that's "infinitesimally tiny" is the visible universe. You must know that the Friedmann equation just defines the dynamics of a scale factor, not a size.
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