You mean like the "One-electron universe" postulate [1]? First, I don't think it's really useful beyond being a fun idea to consider. Also there's a lot more ma

You mean like the "One-electron universe" postulate [1]? First, I don't think it's really useful beyond being a fun idea to consider. Also there's a lot more matter than antimatter, which raises some... logistical problems. Also, unlike electrons/positrons, protons are not fundamental particles, they're made up of quarks which throws a whole other wrench in the idea. [1]: https://en.wikipedia.org/wiki/One-electron_universe https://en.wikipedia.org/wiki/One-electron_universe