On the high-scale instanton interference effect: axion models without domain wall problem

Abstract

We show that a new chiral, confining interaction can be used to break Peccei-Quinn symmetry dynamically and solve the domain wall problem, simultaneously. The resulting theory is an invisible QCD axion model without domain walls. No dangerous heavy relics appear.

Comments: 7 pages, 2 figures. v2: references added, minor correction, conclusions unchanged. v3: discussion extended, title changed according to published version