Symmetries in non-relativistic quantum electrodynamics

We define symmetries in non-relativistic quantum electrodynamics, which have the physical interpretation of rotation, parity and time reversal symmetry. We collect transformation properties related to these symmetries in Fock space representation as well as in the Schrödinger representation. As an application, we generalize and improve theorems about Kramer’s degeneracy in non-relativistic quantum electrodynamics.