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Axion Radiation from Strings
C. Hagmann, S. Chang, P. Sikivie
This paper revisits the problem of the string decay contribution to the axion cosmological energy density. We show that this contribution is proportional to the average relative in…
The cold axion populations
S. Chang, C. Hagmann, P. Sikivie
We give a systematic discussion of the contributions to the cosmological energy density in axions from vacuum realignment, string decay and wall decay. We call these the cold axion…
Axions from wall decay
S. Chang, C. Hagmann, P. Sikivie
We discuss the decay of axion walls bounded by strings and present numerical simulations of the decay process. In these simulations, the decay happens immediately, in a time scale…
Axions from string decay
C. Hagmann, S. Chang, P. Sikivie
We have studied numerically the evolution and decay of axion strings. These global defects decay mainly by axion emission and thus contribute to the cosmological axion density. The…
Studies of the motion and decay of axion walls bounded by strings
S. Chang, C. Hagmann, P. Sikivie
We discuss the appearance at the QCD phase transition, and the subsequent decay, of axion walls bounded by strings in N=1 axion models. We argue on intuitive grounds that the main…