TY - JOUR
T1 - Level crossing between the QCD axion and an axionlike particle
AU - Daido, Ryuji
AU - Kitajima, Naoya
AU - Takahashi, Fuminobu
PY - 2016/4/19
Y1 - 2016/4/19
N2 - 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 calculations to determine the parameter space where the axion roulette takes place, and as a result domain walls are likely formed. The domain wall network without cosmic strings is practically stable, and it is nothing but a cosmological disaster. In a certain case, one can make domain walls unstable and decay quickly by introducing an energy bias without spoiling the Peccei-Quinn solution to the strong charge parity problem.
AB - 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 calculations to determine the parameter space where the axion roulette takes place, and as a result domain walls are likely formed. The domain wall network without cosmic strings is practically stable, and it is nothing but a cosmological disaster. In a certain case, one can make domain walls unstable and decay quickly by introducing an energy bias without spoiling the Peccei-Quinn solution to the strong charge parity problem.
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U2 - 10.1103/PhysRevD.93.075027
DO - 10.1103/PhysRevD.93.075027
M3 - Article
AN - SCOPUS:84964403078
VL - 93
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 7
M1 - 075027
ER -