Cosmological Moduli Problem in Gauge-mediated Supersymmetry Breaking Theories
Cosmological Moduli Problem in Gauge-mediated Supersymmetry Breaking Theories
复制标题
规范介导的超对称破缺理论中的宇宙模问题
DOI：
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发表时间：
1997
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通讯作者：
T. Yanagida
中科院分区：
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作者：
T. Asaka;J. Hashiba;M. Kawasaki;T. Yanagida
一类一般的弦理论预言了光模场的存在，它们的质量有望与规范介导型超对称破缺理论中的引力子质量${m}_{susuremath{varphi}}$相媲美，在${10}^{susuremath2}$kev到1GeV的范围内。这种被普朗克尺度抑制的弱相互作用的光场无法避免一些严格的宇宙学约束，也就是说，它们受到“宇宙学模数问题”的困扰。我们证明了，即使我们考虑了后期的微膨胀(热膨胀)，总的引力质量区域${10}^{ensuremath2}$keV$ensuremath{lesssim}{m}_{3/2}ensuremath{lesssim}1$GeV也被约束排除在外。然而，对原始热膨胀模型的修改使区域${10}^{EnsureMath{-}2}$keV$ensuremath{lesssim}{m}_{3/2}ensuremath{lesssim}500$kev能够经受住约束。还强调，在质量区域${10}^{susuremath2}$keV$ensuremath{lesssim}{m}_{ensuremath{varphi}}ensuremath{lesssim}100$kev，模数可以是我们宇宙中的暗物质。
A generic class of string theories predicts the existence of light moduli fields, and they are expected to have masses ${m}_{ensuremath{varphi}}$ comparable to the gravitino mass ${m}_{3/2}$ which is in a range of ${10}^{ensuremath{-}2}$ keV to 1 GeV in gauge-mediated supersymmetry breaking theories. Such light fields with weak interactions suppressed by the Planck scale cannot avoid some stringent cosmological constraints; that is, they suffer from ``cosmological moduli problems.' We show that the total gravitino mass region ${10}^{ensuremath{-}2}$ keV$ensuremath{lesssim}{m}_{3/2}ensuremath{lesssim}1$ GeV is excluded by the constraints even if we incorporate late-time mini-inflation (thermal inflation). However, a modification of the original thermal inflation model enables the region ${10}^{ensuremath{-}2}$ keV$ensuremath{lesssim}{m}_{3/2}ensuremath{lesssim}500$ keV to survive the constraints. It is also stressed that the moduli can be dark matter in our universe for the mass region ${10}^{ensuremath{-}2}$ keV$ensuremath{lesssim}{m}_{ensuremath{varphi}}ensuremath{lesssim}100$ keV.