Level crossing between the QCD axion and an axionlike particle
Level crossing between the QCD axion and an axionlike particle
We study a level crossing between the QCD axion and an axionlike particle, focusing on the recently found phenomenon, the axion roulette, where the axionlike particle runs along the potential, passing through many crests and troughs, until it gets trapped in one of the potential minima. We perform detailed numerical …