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弯曲空间中来自微型跷跷板机制的轻中微子

Light Neutrinos from a Mini-Seesaw Mechanism in Warped Space

Kristian L. McDonald

摘要:

跷跷板机制为已知中微子的亮度提供了一个简单的解释。在弱尺度狄拉克质量和重无菌马约拉纳尺度的标准假设下,中微子质量自然被抑制在弱尺度以下。然而,自然界可能采用狄拉克和马约拉纳尺度,比通常假设的要小得多,甚至可能远低于弱尺度。在这种情况下,单靠跷跷板机制并不能完全解释中微子的亮度。在这项工作中,我们考虑了一个扭曲的框架,实现这种可能性相结合的自然抑制狄拉克和马约拉纳尺度在一个迷你跷跷板机制,产生轻中微子质量。通过AdS/CFT对应的模型是对偶的4D理论与一个隐藏的强耦合部门包含轻复合右手中微子。

英文摘要:

The seesaw mechanism provides a simple explanation for the lightness of the known neutrinos. Under the standard assumption of a weak scale Dirac mass and a heavy sterile Majorana scale the neutrino mass is naturally suppressed below the weak scale. However, Nature may employ Dirac and Majorana scales that are much less than typically assumed, possibly even far below the weak scale. In this case the seesaw mechanism alone would not completely explain the lightness of the neutrinos. In this work we consider a warped framework that realizes this possibility by combining naturally suppressed Dirac and Majorana scales together in a mini-seesaw mechanism to generate light neutrino masses. Via the AdS/CFT correspondence the model is dual to a 4D theory with a hidden strongly coupled sector containing light composite right-handed neutrinos.

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