Multi-chaotic inflation with and without spectator field

Multi-chaotic inflation with and without spectator field
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有或没有观众场的多混沌膨胀

DOI:
10.1088/1475-7516/2022/07/042
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发表时间:
2022
影响因子:
6.4
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:
Morishita Yukiyoshi;Takahashi Tomo;Yokoyama Shuichiro

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受Planck+ BICEP/Keck最近发表的结果的启发,我们研究了多场暴胀模型在谱指数ns和张量标量比r方面的一致性.在这项研究中,我们专注于双暴胀子模型和没有观众场。我们发现,具有二次势的暴胀子可以成为可行的,当实现三个领域与一个特定的分级质谱,使两个领域作为暴胀子,另一个是观众。我们还讨论了避免微调的条件,通过仔细研究预测如何依赖于暴胀子场空间中的背景轨迹。
Motivated by the result of Planck+ BICEP/Keck recently released, we investigate the consistency of the multi-field inflation models in terms of the spectral index n s and the tensor-to-scalar ratio r. In this study, we focus on double-inflaton models with and without a spectator field. We find that inflaton with a quadratic potential can become viable when three fields with a specific hierarchical mass spectrum are realized such that two fields act as inflatons and the other one is the spectator. We also discuss the conditions to avoid the fine-tuning, by careful study of how the prediction depends on the background trajectory in the inflaton-field space.
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