Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-11-28
Phys.Rev. D58 (1998) 083509
Physics
High Energy Physics
High Energy Physics - Phenomenology
A few changes in section IV and V
Scientific paper
10.1103/PhysRevD.58.083509
A generic class of string theories predicts the existence of light moduli fields, and they are expected to have masses $m_\phi$ comparable to the gravitino mass $m_{3/2}$ which is in a range of $10^{-2}$keV--1GeV in gauge-mediated supersymmetry breaking theories. Such light fields with weak interactions suppressed by the Planck scale can not avoid some stringent cosmological constraints, that is, they suffer from `cosmological moduli problems'. We show that all the gravitino mass region $10^{-2}$keV $\lesssim m_{3/2} \lesssim$ 1GeV is excluded by the constraints even if we incorporate a late-time mini-inflation (thermal inflation). However, a modification of the original thermal inflation model enables the region $10^{-2}$keV $\lesssim m_{3/2} \lesssim$ 500keV to survive the constraints. It is also stressed that the moduli can be dark matter in our universe for the mass region $10^{-2}$keV $\lesssim m_\phi \lesssim$ 100keV.
Asaka Takehiko
Hashiba Jiro
Kawasaki Masahiro
Yanagida Takayuki
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