永远存在的埃塔问题：需要所有隐藏部门的知识
The everpresent eta-problem: knowledge of all hidden sectors required
摘要：
我们认为，超重力暴胀中的eta问题不能解决，如果不知道的基态的引力耦合到暴胀的隐藏部门。如果隐藏扇区独立地打破超对称性，那么在暴胀子的宇宙学演化过程中，它的场就不能稳定。我们表明，随后的动态混合部门之间以及隐藏部门的最轻的质量设置的超对称性破缺的隐藏部门的规模。真正的宇宙学η参数来自于隐藏扇区最轻模与暴胀子的线性组合。一般来说，要么真实的eta与暴胀子扇区单独隐含的朴素eta有很大的偏差，要么必须考虑多场模型。只有当隐藏扇区中最轻的质量远大于暴胀子质量，并且暴胀子质量远大于隐藏扇区超对称破缺的尺度时，隐藏扇区对暴胀子慢滚动力学的影响才可以忽略。
英文摘要：
We argue that the eta-problem in supergravity inflation cannot be solved without knowledge of the ground state of hidden sectors that are gravitationally coupled to the inflaton. If the hidden sector breaks supersymmetry independently, its fields cannot be stabilized during cosmological evolution of the inflaton. We show that both the subsequent dynamical mixing between sectors as well as the lightest mass of the hidden sector are set by the scale of supersymmetry breaking in the hidden sector. The true cosmological eta-parameter arises from a linear combination of the lightest mode of the hidden sector with the inflaton. Generically, either the true eta deviates considerably from the naïve eta implied by the inflaton sector alone, or one has to consider a multifield model. Only if the lightest mass in the hidden sector is much larger than the inflaton mass and if the inflaton mass is much larger than the scale of hidden sector supersymmetry breaking, is the effect of the hidden sector on the slow-roll dynamics of the inflaton negligible.
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