Large tensor mode, field range bound and consistency in generalized G-inflation
Large tensor mode, field range bound and consistency in generalized G-inflation
复制标题
广义 G 暴胀中的大张量模式、场范围界限和一致性
DOI：
10.1088/1475-7516/2015/08/044
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发表时间：
2015
影响因子：
6.4
通讯作者：
Jun'ichi Yokoyama
中科院分区：
文献类型：
--
作者：
Taro Kunimitsu;Teruaki Suyama;Yuki Watanabe;Jun'ichi Yokoyama
我们系统地证明，在势驱动的广义 G 暴胀模型中，可以避免来自强耦合尺度新物理的量子校正，同时产生可观测的张量模式。有效作用可以通过树级作用来近似，因此，尽管我们引入了低于膨胀能量尺度的新质量尺度，但这些模型内部是一致的。尽管可观测的张量模式是通过亚强耦合尺度场偏移产生的，但这并不是对 Lyth 界限的规避，因为模型包含更高导数的非规范动力学项，并且场的有效重新缩放将导致超普朗克场偏移。我们认为，暴胀子的增强动力学项屏蔽了与其他场的相互作用，使系统在暴胀过程中保持弱耦合。
We systematically show that in potential driven generalized G-inflation models, quantum corrections coming from new physics at the strong coupling scale can be avoided, while producing observable tensor modes. The effective action can be approximated by the tree level action, and as a result, these models are internally consistent, despite the fact that we introduced new mass scales below the energy scale of inflation. Although observable tensor modes are produced with sub-strong coupling scale field excursions, this is not an evasion of the Lyth bound, since the models include higher-derivative non-canonical kinetic terms, and effective rescaling of the field would result in super-Planckian field excursions. We argue that the enhanced kinetic term of the inflaton screens the interactions with other fields, keeping the system weakly coupled during inflation.