Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-06
Phys.Lett. B437 (1998) 44-50
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, latex
Scientific paper
10.1016/S0370-2693(98)00887-9
In supersymmetric theories, the Peccei-Quinn symmetry has a complex extension as a symmetry of the superpotential, so that the scalar potential always has an almost flat direction, the dilaton. We discuss how coherent oscillation of the dilaton affects axion cosmology. We stress that the dilaton decay, if its dominant mode is not into axions, releases large entropy at a late epoch of the Universe's evolution to dilute axion energy density and the upperbound of the decay constant is raised up to about $10^{15}$ GeV. The case of the M-theory axion is also discussed.
Hashimoto Makoto
Izawa K.-I.
Yamaguchi Masahide
Yanagida Takayuki
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