Domain Wall Problem of Axion and Isocurvature Fluctuations in Chaotic Inflation Models

S. Kasuya; M. Kawasaki; T. Yanagida

doi:10.1016/S0370-2693(97)01270-7

paper

Domain Wall Problem of Axion and Isocurvature Fluctuations in Chaotic Inflation Models

arXiv:hep-ph/9709202 · doi:10.1016/S0370-2693(97)01270-7

Abstract

We study the domain wall problem of an axion in chaotic inflation models. We show that the production of domain walls does not occurs if the Peccei-Quinn scalar has a flat potential and its breaking $F_{a}$ is larger than $\sim 1 0^{15}$ GeV. We find that too large isocurvature fluctuations are produced for such high $F_{a}$ . In order for those isocurvature fluctuations to be consistent with observations of the large scale structure of the universe, the self-coupling constant $g$ and the breaking scale of the Peccei-Quinn scalar should be $g ≃ (1 - 2.8) \times 1 0^{- 13}$ and $F_{a} ≃ (0.6 - 1.5) \times 1 0^{15}$ GeV, respectively. In particular the value of self-coupling constant is almost the same as that required for a chaotic inflation, which strongly suggests that the Peccei-Quinn scalar itself is an inflaton.

9pages (LaTeX2e)

Domain Wall Problem of Axion and Isocurvature Fluctuations in Chaotic Inflation Models

Abstract

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