Can a single photon make up a universe?

[sgphysics]

If you had a universe that only contained a single photon - would it be valid to call it a universe? If so, what properties would it have, like time, no of dimensions etc? And if you added a second photon,could you say that you then have a universe with 2 photons in it?

 

[Nugatory]

There is no good answer to this question, because we only have the universe that we live in. Thus your question comes down to "If something that doesn't and can't exist existed, what properties would it have?", and that's not a question that can be answered scientifically.

This thread is closed because the question is out of scope for Physics Forums.