表題番号：2022C-573
日付：2023/03/28
研究課題非自明な背景古典場を含む場の量子論の研究
| 研究者所属（当時） | 資格 | 氏名 | |
|---|---|---|---|
| （代表者） | 高等研究所 | 講師 | 山田 悠介 |
| （連携研究者） | Stanford University | professor | Andrei Linde |
| （連携研究者） | Stanford University | professor emerita | Renata Kallosh |
| （連携研究者） | Lehigh University | assistant professor | Timm Wrase |
| （連携研究者） | 理化学研究所 数理創造プログラム | 基礎科学特別研究員 | 田屋 英俊 |
- 研究成果概要
- In supergravity inflation models, a supersymmetry breaking fermion called Goldstino plays an important role to realize accelerated expansion of the Universe. It was pointed out by Dall'Agata et al. that Goldstino may form a condensation, which leads to instability to the system and successful expansion of the Universe would not occur. With Kallosh, Linde, Wrase, I showed that such condensation of Goldstino is unphysical and clarified the problem of the analysis the authors took in their paper. We have reported our result in Journal of High Energy Physics.With Taya, I have also discussed the particle scattering process in the very early Universe. In particular, just after inflation, the Universe is filled with scalar field condensate, and particles coupled to the condensate can be produced from "vacuum". We have considered the scattering processes of such particles to other light particles. We have found that due to the absence of energy conservation, parent particle produced from vacuum can decay into very light particles, which is kinematically forbidden in the standard scattering process. Interestingly, it turned out that such a kinematically forbidden process is more efficient than the kinematically allowed decay. We have reported our result at PASCOS 2022, JPS meeting and Journal of High Energy Physics.