Abstract
We calculate the phase diagram obtained by varying a chirally invariant four-fermion interaction as well as the usual gauge coupling g in hamiltonian lattice QED. We employ a strong-coupling expansion to fourth order ( 1 g 8 ) and monitor poles in the Padé approximants to find the critical gauge coupling g c. We find that the new phase of QED can be reached even for weak g if the four-fermion coupling is sufficiently strong.
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