Light Particles with Spin in Inflation
Light Particles with Spin in Inflation
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DOI：
10.1088/1475-7516/2018/10/013
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发表时间：
2018-06
影响因子：
6.4
通讯作者：
Lorenzo Bordin;P. Creminelli;A. Khmelnitsky;L. Senatore
中科院分区：
文献类型：
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作者：
Lorenzo Bordin;P. Creminelli;A. Khmelnitsky;L. Senatore
在暴胀过程中，具有自旋的轻粒子的存在被Higuchi束缚所禁止。如果考虑与暴胀子叶理有相当大耦合的态，这个结论就可以回避，因为这破坏了德西特等距。这些状态的作用可以在暴胀的有效场论中构造，或者使用CCWZ程序。具有自旋的轻粒子与软暴胀子微扰具有规定的耦合，这些耦合被编码在一致性关系中。我们研究自旋为2的光态的现象学。这些混合与引力子改变张量功率谱，并可能导致相当大的张量非高斯性。它们还产生了一个标量双谱和三谱与特征的角度相关的非高斯。
The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton foliation, since this breaks the de Sitter isometries. The action for these states can be constructed within the Effective Field Theory of Inflation, or using a CCWZ procedure. Light particles with spin have prescribed couplings with soft inflaton perturbations, which are encoded in consistency relations. We study the phenomenology of light states with spin 2. These mix with the graviton changing the tensor power spectrum and can lead to sizeable tensor non-Gaussianities. They also give rise to a scalar bispectrum and trispectrum with a characteristic angle-dependent non-Gaussianity.