Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-12-20
Phys.Rev.D54:2442-2446,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, uudecoded postscript file with figures
Scientific paper
10.1103/PhysRevD.54.2442
In the chaotic inflation models, quantum fluctuations for axion fields lead to the overproduction of domain walls and too large isocurvature fluctuations which is inconsistent with the observations of cosmic microwave background anisotropies. These problems are solved by assuming a very flat potential for the Peccei-Quinn scalar. As the simplest possibility, we consider a model where the Peccei-Quinn scalar is an inflaton itself and show that the isocurvature fluctuations can be comparable with the adiabatic ones. We investigate cosmological implications in the case that both adiabatic and isocurvature fluctuations exist and find that the amplitude of the matter spectrum becomes smaller than that for the pure adiabatic case. This leads to relatively high bias parameter ($b \simeq 2$) which is favoured by the current observations.
Kawasaki Masahiro
Sugiyama Naoshi
Yanagida Takayuki
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