How is QM modified in a small universe? Usually we have path integrals that consider every possible path throughout infinity. But what about the early universe that may have been about the size of an atom or smaller? Do we continue to consider all paths throughout infinity? Or are the paths constrained to the size of the universe, which may be quite small?(adsbygoogle = window.adsbygoogle || []).push({});

Thanks.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# QM in a very small universe.

**Physics Forums | Science Articles, Homework Help, Discussion**