Renormalization Flow in Lattice QED

An investigation of pure U(1) gauge theory is made based on block-spin transformations for configurations of lattice size ${16}^4$ down to size $8^4$ and $4^4$. Even operators (five types in the first three representations) and ten renormalized couplings are determined on these smaller lattices. This allows the mapping of the renormalization flow. An interesting fixed-point structure and results on the leading critical exponent are found.