Gravitino Overproduction in Inflaton Decay
Gravitino Overproduction in Inflaton Decay
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DOI：
10.1016/j.physletb.2006.05.037
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发表时间：
2006-03
期刊：
影响因子：
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通讯作者：
M. Kawasaki;F. Takahashi;T. Yanagida
中科院分区：
文献类型：
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作者：
M. Kawasaki;F. Takahashi;T. Yanagida
大多数暴胀模型最终得到真实真空中暴胀场φ的不消失真空期望值，这通常会导致超重力中暴胀势的不消失辅助场g<e:1>。我们证明了非零重力体的存在会导致膨胀衰变为一对引力子，因此受到宇宙学的严重约束，特别是当引力子不稳定且其质量在0 (100)GeV-O (10) TeV范围内时。对于几种暴胀模型，我们明确地计算了gϕ的值，并发现对于该范围内的引力子质量，它们中的大多数都被排除或处于被排除的边缘。我们得出的结论是，具有消失的ϕ的暴胀模型，通常在混沌暴胀中实现，在某种意义上是有利的，因为它自然地避免了潜在的引力子生产过剩问题。
Most of the inflation models end up with non-vanishing vacuum expectation values of the inflaton fields ϕ in the true vacuum, which induce, in general, non-vanishing auxiliary field Gϕfor the inflaton potential in supergravity. We show that the presence of nonzero Gϕgives rise to inflaton decay into a pair of the gravitinos and are thereby severely constrained by cosmology especially if the gravitino is unstable and its mass is in a range of O(100) GeV–O(10) TeV. For several inflation models, we explicitly calculate the values of Gϕand find that most of them are excluded or on the verge of being excluded for the gravitino mass in that range. We conclude that an inflation model with vanishing Gϕ, typically realized in a chaotic inflation, is favored in a sense that it naturally avoids the potential gravitino overproduction problem.