Chromotron t1_j6nqjc7 wrote on January 31, 2023 at 5:08 PM

Reply to comment by RhynoD 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

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.