Isocurvature Fluctuations of the M-theory Axion in a Hybrid Inflation Model
Abstract
The M-theory which is the strong-coupling heterotic string theory brings various interesting new phenomenologies to us. The M-theory bulk axion is one of them, whose decay constant is estimated as $F_a\simeq 10^{16}$GeV. Direct searches for the M-theory axion seem impossible because of the large decay constant. However, we point out that large isocurvature fluctuations of the M-theory axion are obtained in a hybrid inflation model, which will most likely be detectable in future satellite experiments on anisotropies of the cosmic microwave background radiation.Keywords
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