# is there any theory or observational evidence that our universe is electrically neutral or not?

It seems our universe is neutral in large scale.

There is CP violation (wiki) problem with respect to matter and antimatter.
Similarly is there any theory about whether our universe is electrically neutral?

Cosmic rays are not neutral. However the atomic nucleus and electrons are just separated. There should be no charge excess in total.

What is the largest scale that is severely non-neutral?

• OK. I find a paper. arxiv.org/abs/1201.6585 This can partly answer my question. Jul 15, 2014 at 11:30
• @RoryAlsop A similar question already exists on Physics: physics.stackexchange.com/questions/83486/… Jul 18, 2014 at 13:44
• Note that the paper by Düren (the one you quoted in your comment) has not appeared in any peer-reviewed journal. That is a serious indication that it didn't make it through the review process for some good reasons, e.g. it violates known observational constraints. Sep 5, 2014 at 9:30
• Do you mean areas of large and stable static charges? Because otherwise anywhere there is a magnetic field there is some imbalance which is generating the current and hence the field - there is good evidence of magnetic fields at galactic scale. But I guess that is not what you mean. Nov 16, 2014 at 14:35
• You mean it could be un-neutral in galactic scale? We do not care about time-scale here. Suppose there is an isolated galaxy which loses many of its electrons and can not get the electrons back for some kind of reason. Nov 16, 2014 at 18:39

By observation, gravity dominates the universe on large scales. If there were a significant disparity in positive and negative charges then we would expect electromagnetism—which is approximately $10^{39}$ times more powerful than gravity—to dominate. So by this observation we can conclude that the universe is approximiately electrically neutral. Exactly why this should be so is not well-understood, and ultimately ties into the matter-antimatter problem, aka the baryon asymmetry.