The BχF five-dimensional regulator for chiral gauge theories simultaneously solves the strong CP problem and the U(1)_A problem for QCD, via bulk fermion zeromodes that quench nontrivial topological vacuum contributions.
Absence of Neutrinos on a Lattice. 1. Proof by Homotopy Theory,
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Regulated chiral gauge theory and the strong CP problem
The BχF five-dimensional regulator for chiral gauge theories simultaneously solves the strong CP problem and the U(1)_A problem for QCD, via bulk fermion zeromodes that quench nontrivial topological vacuum contributions.