The method of gap domain wall fermions

I present the gap domain wall fermion (GDWF) method. I show that GDWF induce a substantial gap in the transfer matrix Hamiltonian along the fifth dimension. As a result they significantly improve the chiral properties of domain wall fermions in the large to intermediate lattice spacing regime of QCD, 1 to 2 GeV. Furthermore, I argue that this method should also improve the chiral properties of related lattice fermions.