Burden, C. J.2026-01-022026-01-020370-2693ORCID:/0000-0003-0015-319X/work/167650887https://hdl.handle.net/1885/733802807We calculate hamiltonian strong coupling expansions to order g-16 of the vacuum energy and chiral condensate for massless QED with two fermion flavours and a chirally invariant four-fermion interaction. An estimate of the chiral symmetry restoring phase diagram and critical exponents are given, assuming a continuous phase transition.6enThe phase diagram of hamiltonian lattice QED with a 4-fermion coupling1989-10-1210.1016/0370-2693(89)91170-245349111069