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観測的に支持されているインフレーションモデルの宇宙論的帰結

观测支持的暴胀模型的宇宙学后果

基本信息

批准号：
19J21472
负责人：
HE MINXI
金额：
$ 2.18万
依托单位：
High Energy Accelerator Research Organization (2020-2021)The University of Tokyo (2019)
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2019
资助国家：
日本
起止时间：
2019-04-25 至 2022-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19J21472/
关键词：
Reheating Inflation Higgs R^2 Preheating Tachyonic instability

项目摘要

I have finished the investigation of the reheating process after inflation in the mixed Higgs-R^2 model. My study can improve the observational constraint on this theoretically motivated inflation model with minimal setup within the Standard Model and general relativity. I investigated the perturbative reheating in this model where the perturbative decay of inflatons to relativistic particles plays an essential role. Such a process usually dominates the energy transfer from inflaton to radiation at late time. Besides, the perturbative reheating always occurs as long as the preheating process is not fine-tuned enough to reheating the Universe. I calculated the perturbative decay rates of inflatons and found that they differ significantly from the single-field case due to the multi-field structure. I took into account the decay rates as friction terms in the equations of motion of inflatons and solved them numerically together with the Boltzmann equation, finding that the reheating temperature is independent of the detail of preheating while the duration will differ as the efficiency of preheating changes. The reheating temperature is higher for Higgs-like parameters than for R^2-like. This result breaks the degeneracy of inflation predictions among model parameters so that more precise observation in the future can easily constrain the model parameter in this model. Confirming or ruling out this model is decisive for the question whether inflation is realized with physics beyond the Standard Model.

我完成了对混合Higgs-R^2模型中暴胀后再加热过程的研究。我的研究可以在标准模型和广义相对论中以最小的设置改善这个理论驱动的暴胀模型的观测约束。我研究了微扰再加热在这个模型中的暴胀子相对论粒子的微扰衰变起着至关重要的作用。这种过程通常支配着后期暴胀子向辐射的能量转移。此外，只要预热过程没有被微调到足以重新加热宇宙，微扰重新加热总是会发生。我计算了暴胀子的微扰衰变率，发现由于多场结构，它们与单场情况有显著的不同。我考虑到衰变率作为摩擦项的运动方程的暴胀子和解决他们的数值与玻尔兹曼方程，发现再加热温度是独立的预热的细节，而持续时间将不同的预热效率的变化。类Higgs参数的再加热温度高于类R^2参数。这一结果打破了模型参数之间通货膨胀预测的退化，以便将来更精确的观测可以很容易地约束该模型中的模型参数。对于暴胀是否在标准模型之外的物理学中得以实现的问题，证明或排除这个模型是决定性的。