Occurrence of tachyonic preheating in the mixed Higgs-R2 model
Occurrence of tachyonic preheating in the mixed Higgs-R2 model
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DOI：
10.1088/1475-7516/2021/01/066
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发表时间：
2020-07
影响因子：
6.4
通讯作者：
Min-Tsung He;Ryusuke Jinno;K. Kamada;A. Starobinsky;J. Yokoyama
中科院分区：
文献类型：
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作者：
Min-Tsung He;Ryusuke Jinno;K. Kamada;A. Starobinsky;J. Yokoyama
最近有人提出，在暴胀混合 Higgs-R2 模型的暴胀后阶段，希格斯场的快子不稳定性可能会产生有效的粒子。如果满足适当的条件，特别是在类希格斯体系中，它可能会完成宇宙的预热。在本文中，我们更深入地研究了这种行为，包括发生的条件、最大效率的分析估计，以及模型参数之间必要的微调程度，以通过这种效应完成预热。我们发现，导致最有效的快子不稳定性的参数集分别在类 Higgs 区域和 R2 类区域中遵循简单的定律。然后我们估计这种不稳定性的效率。特别是，即使在具有小的非最小耦合的深 R2 状态下，尽管需要对模型参数进行严格的微调，但这种效应也足以完成预热。我们还估计需要多少微调才能通过这种效果完成预热。结果表明，在具有大标量质量的深希格斯体系中，为产生足够的粒子而对参数进行微调至少 < 𝒪(0.1)，而在具有较小非最小耦合的类 R2 体系中，其更严重~ 𝒪(10−4)–𝒪(10−5)。
It has recently been suggested that at the post-inflationary stage of the mixed Higgs-R2 model of inflation efficient particle production can arise from the tachyonic instability of the Higgs field. It might complete the preheating of the Universe if appropriate conditions are satisfied, especially in the Higgs-like regime. In this paper, we study this behavior in more depth, including the conditions for occurrence, analytical estimates for the maximal efficiency, and the necessary degree of fine-tuning among the model parameters to complete preheating by this effect. We find that the parameter sets that cause the most efficient tachyonic instabilities obey simple laws in both the Higgs-like regime and the R2-like regime, respectively. We then estimate the efficiency of this instability. In particular, even in the deep R2-like regime with a small non-minimal coupling, this effect is strong enough to complete preheating although a severe fine-tuning is required among the model parameters. We also estimate how much fine-tuning is needed to complete preheating by this effect. It is shown that the fine-tuning of parameters for the sufficient particle production is at least < 𝒪(0.1) in the deep Higgs-like regime with a large scalaron mass, while it is more severe ∼ 𝒪(10−4)–𝒪(10−5) in the R2-like regime with a small non-minimal coupling.