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| QCD axion and small scale inflation |
| 2018-08-06
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| CAS Key Laboratory of Theoretical Physics | | Institute of Theoretical Physics | | Chinese Academy of Sciences | | Seminar | | Title 题目 | QCD axion and small scale inflation | | Speaker 报告人 | Wen Yin (殷文) | | Affiliation 所在单位 | IHEP, Beijing | | Date 日期 | 2018年8月6日（周一）下午3：30 | | Venue 地点 | Conference Room 6420, ITP new building | | Abstract 摘要 | After a brief review on the strong CP and QCD axion, we show that the upper bound of the classical QCD axion window can be significantly relaxed for low-scale inflation. If the Gibbons-Hawking temperature during inflation is lower than the QCD scale, the initial QCD axion misalignment angle follows the Bunch-Davies distribution. The distribution is peaked at the strong CP conserving minimum if there is no other light degree of freedom contributing to the strong CP phase. As a result, the axion over-production problem is significantly relaxed even for an axion decay constant larger than 10^{12} GeV. | | Contact person 所内联系人 | 杨金民 | |
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