I know in classical field theory we have the electromagnetic field. And Maxwell's equations show how electromagnetic radiation can propagate through empty space.
I also have been reading about QED and I gather the electric repulsion between two electrons is mediated by a virtual photon.
Also, as I understand it, in quantum field theory we speak of particles as manifestation of an underling field. For instance, a photon is a manifestation of a photon field.
Are quantum fields like electron fields or photon fields one big field (like we assume gravity to be one field) or are there separate ones? Meaning, can I have several electron fields?
I often here the term electromagnetism and people say they are the same force. Are electron fields and photons fields part of the same underlying field or are they separate fields that just interact?