COSMOLOGICAL CONSTRAINT ON THE STRING DILATON IN GAUGE-MEDIATED SUPERSYMMETRY BREAKING THEORIES
COSMOLOGICAL CONSTRAINT ON THE STRING DILATON IN GAUGE-MEDIATED SUPERSYMMETRY BREAKING THEORIES
复制标题
规范介导的超对称破缺理论中弦膨胀的宇宙学约束
DOI：
10.1103/physrevlett.79.4525
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发表时间：
1997
影响因子：
8.6
通讯作者：
T. Yanagida
中科院分区：
文献类型：
--
作者：
J. Hashiba;M. Kawasaki;T. Yanagida
弦理论中的伸缩子场(如果存在的话)的质量应该是引力子质量m{sub3/2}的数量级，而在规范介导型超对称破缺模型中，这个质量在10{sup{-}2}kev{endash}1GeV的范围内。如果是这样的话，相干膨胀子振荡的宇宙能量密度很容易超过现在宇宙的临界密度。我们表明，即使这个问题是通过后期的熵产生(热膨胀)来解决的，从宇宙x({Gamma})射线背景的实验上限也可以得到对伸缩子振荡的能量密度的严格约束。这排除了规范介导型超对称破缺模型中一个有趣的质量区域，500keV{近似lt}m{sub3/2}{近似lt}1GeV。{版权所有}{ITAL 1997}{ITAL The American Physitive Society}
The dilaton field in string theories (if it exists) is expected to have a mass of the order of the gravitino mass m{sub 3/2} which is in a range of 10{sup {minus}2} keV{endash} 1 GeV in gauge-mediated supersymmetry breaking models. If this is the case, the cosmic energy density of coherent dilaton oscillation easily exceeds the critical density of the present Universe. We show that even if this problem is solved by a late-time entropy production (thermal inflation) a stringent constraint on the energy density of the dilaton oscillation is derived from experimental upper bounds on the cosmic x({gamma} )-ray backgrounds. This excludes an interesting mass region, 500 keV{approx_lt}m{sub 3/2}{approx_lt} 1 GeV , in gauge-mediated supersymmetry breaking models. {copyright} {ital 1997} {ital The American Physical Society}