Electrodynamics with a preferred frame

We introduce a variant of quantum and classical electrodynamics formulated on the grounds of a hypothesis of existence of a preferred frame of reference—a formalism complementary to that regarding the structure of the space of photonic states, presented by us recently [Phys. Rev. A 97, 062106 (2018)]. The present approach makes a unique test theory to search for a preferred frame for photons in experiments, one of which is suggested.