Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-08-22
Phys.Lett. B409 (1997) 94-100
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX2e 19 pages including 5 figures (use epsf.sty), revised version to be published in Physics Letters B
Scientific paper
10.1016/S0370-2693(97)00809-5
We investigate two cosmological axion problems (isocurvature fluctuations and domain-wall formation) in chaotic inflationary universe. It is believed that these problems are solved if potential for the Peccei-Quinn scalar field is very flat. However, we find that too many domain walls are produced through parametric resonance decay of the Peccei-Quinn scalar field. Only the axion model with N=1(N: QCD anomaly factor) is consistent with observations. We also point out that the flat potential is naturally obtained in a supersymmetric extension of the Peccei-Quinn model. If Peccei-Quinn breaking scale $F_a$ is about 10^{12} GeV, this model predicts anisotropies of cosmic microwave background radiation due to the axion isocurvature fluctuations which may be detectable in future observations.
Kasuya Shinta
Kawasaki Masahiro
Yanagida Takayuki
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