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RhynoD t1_j6nia1p wrote

Reply to comment by Chromotron in ELI5: If the universe is flat, and therefore infinite in size, how could it have been condensed to a single point in the past? by joeyo1423

Conversely, I have heard arguments that the misconception was that any part of the universe, infinite or otherwise, was a single point. Rather, all points were infinitesimally close, but not occupying the same space and not truly one point. In that case, the universe would continue to be infinitely large and infinitesimally small.

But I don't know enough about math or physics to know or argue one way or another.

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Chromotron t1_j6nqjc7 wrote

There are ways to work with infinitesimal numbers just as with real numbers, but that does not really do the trick, as physics is not based on that. To my understanding (not an expert in cosmology or that deep into physics) the energies/fields of back then can cause infinite densities.

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