Violation of slow-roll in nonminimal inflation

Violation of slow-roll in nonminimal inflation
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违反非最小通胀中的慢滚动

DOI:
10.1103/physrevd.102.043524
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发表时间:
2020
期刊:
影响因子:
5
通讯作者:
Yokoyama Shuichiro
Yokoyama Shuichiro
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Takahashi Tomo;Tenkanen Tommi;Yokoyama Shuichiro

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我们发现,一个非最小的引力耦合不仅可以使一些膨胀模型与宇宙学数据相一致,类似于希格斯膨胀的情况下,但也可以调用慢滚破坏,实现一个优雅的退出通货膨胀。特别是,当模型与重力的耦合程度最低时,应该假设一个结束暴胀的不稳定机制。作为明确的例子,我们考虑幂律和逆单项膨胀模型与引力的非最小耦合。虽然这些模型被排除在最小耦合的情况下,我们表明,它们可以成为可行的再次在nonminimally耦合的情况下。在我们考虑的大多数情况下,再加热可以通过引力粒子的产生自然实现,但这以非平凡的方式依赖于基础的引力理论。
We show that a nonminimal coupling to gravity can not only make some inflationary models consistent with cosmological data, similar to the case of Higgs inflation, but can also invoke slow-roll violation to realize a graceful exit from inflation. In particular, this is the case in models where a destabilizing mechanism that ends inflation should be assumed when the model is minimally coupled to gravity. As explicit examples, we consider the power-law and inverse monomial inflation models with a nonminimal coupling to gravity. While these models are excluded in the minimally coupled case, we show that they can become viable again in nonminimally coupled scenarios. In most scenario we considered, reheating can be naturally realized via gravitational particle production but this depends on the underlying theory of gravity in a nontrivial way reheating can be naturally realized via gravitational particle production but that this depends on the underlying theory of gravity in a nontrivial way.
场论模型在没有宇宙常数和其他微调问题的情况下产生“典型的暴胀”
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