We propose a paradigm where the QCD axion’s unexplored cosmological evolution, a rotation in the field space, gives rise to dark matter, the baryon asymmetry, and/or gravitational waves. The rotation is initiated by explicit Peccei-Quinn (PQ) symmetry breaking effective in the early Universe. The abundance of axion dark matter is determined by the rotational speed via what we call kinetic...
Parity solutions to the strong CP problem are a compelling alternative to approaches based on Peccei-Quinn symmetry, particularly given the expected violation of global symmetries in a theory of quantum gravity. The most natural of these solutions break parity at a low scale, giving rise to a host of experimentally accessible signals. We assess the status of the simplest parity-based solution...
