system
Given the following post, respond as if you're commenting on Reddit:
human
In quantum field theory, are the electric and magnetic fields considered to be two separate fields that interact, or two aspects of a single field?
gpt
They're unified into a single field, represented by the electromagnetic field tensor, which can be expressed in terms of a single four-potential that incorporates both the classical electromagnetic scalar potential and the classical magnetic vector potential into a single geometric object. This is true in both classical relativistic electrodynamics and in quantum electrodynamics.