Field redefinitions, perturbative unitarity and Higgs inflation
Field redefinitions, perturbative unitarity and Higgs inflation
复制标题
场重新定义、微扰酉性和希格斯暴涨
DOI：
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发表时间：
2022
影响因子：
5.4
通讯作者：
S. Zell
中科院分区：
文献类型：
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作者：
Georgios K. Karananas;M. Shaposhnikov;S. Zell
对于由希格斯场驱动的非最小引力耦合的暴胀，我们研究了微扰理论崩溃的截止能量标度。采用度量制定，我们首先给出了一个概述已知的结果，然后提供了一种新的方法来计算下限的截止。我们的方法既不依赖于规范的选择，也不需要任何振幅的计算。相反，它利用了S-矩阵在域重定义下不变的事实。与以前的研究结果一致，我们证明了在通货膨胀期间的截止值显着高于真空，这确保了半经典预测的鲁棒性。沿着的方式，我们推广我们的研究结果的Palatini制定和评论一个有用的参数化的希格斯偶极子在这两种情况下。
For inflation driven by the Higgs field coupled non-minimally to gravity, we study the cutoff energy scale above which perturbation theory breaks down. Employing the metric formulation, we first give an overview of known results and then provide a new way to calculate a lower bound on the cutoff. Our approach neither relies on a gauge choice nor does it require any calculation of amplitudes. Instead, it exploits the fact that the S-matrix is invariant under field redefinitions. In agreement with previous findings, we demonstrate that the cutoff is significantly higher during inflation than in vacuum, which ensures the robustness of semi-classical predictions. Along the way, we generalize our findings to the Palatini formulation and comment on a useful parametrization of the Higgs doublet in both scenarios.