mass/energy conversion (in particular to/from photons, i.e. EM waves) is a kind of huge hint that there is really only energy and spacetime (and with energy bei

mass/energy conversion (in particular to/from photons, i.e. EM waves) is a kind of huge hint that there is really only energy and spacetime (and with energy being just a configuration of spacetime we're left with the spacetime only really). The only issue is the nature of electric charge - what is it really, i.e. can it be reduced to gravity? can it be just an emergent property of energy/spacetime? And in particular the repelling property of the charge which at first seems to not exist for gravity - then where it comes from? I think it is some spin based effect along the lines of the [non-charged] black holes spin-spin interaction based repelling effect, something like this https://arxiv.org/abs/1901.02894 https://arxiv.org/abs/1901.02894 Another commenter https://news.ycombinator.com/item?id=27943428 https://news.ycombinator.com/item?id=27943428 talks what basically looks to me as an emergence of EM field from rotation - "to multiply each point of the universe by a different complex number of modulo 1" - ie. as an artefact emerging by changing the frame to the one where the system is rotating (ie. gets a spin). Kind of similar how magnetic field is just emergent artefact in the frame where charge is linearly moving.