09/26
2023
Seminar
- Title题目 On the importance of heavy fields in pseudo-scalar inflation
- Speaker报告人 周思益 （重庆大学）
- Date日期 2023年09月26日 14:00
- Venue地点 线下: 南楼6620 线上: https://meeting.tencent.com/dm/poLaIMwuZoWx 腾讯会议： 856-417-532
Abstract摘要
Pseudo-scalar inflation coupled with U(1) gauge fields through the Chern-Simons term has been extensively studied. However, new physics arising from UV theories may still influence the pseudo-scalar field at low-energy scales, potentially impacting predictions of inflation. In the realm of effective field theory (EFT), we investigated axion inflation, where operators from heavy fields are also present, in addition to the axion and gauge fields. The integrated out fields have two significant effects: the non-linear dispersion regime and coupling heavy modes to the Chern-Simons term. The first effect changes the propagation of the curvature fluctuation, while the second one results in additional operators that contribute to curvature fluctuation via inverse decay. We derived the power spectrum and magnitude of equilateral non-Gaussianity in this low-energy EFT. We found that the second effect could become significant as the mass of heavy fields approaches Hubble scale.
报告人简介：
周思益博士，2014年本科毕业于中国科大，同年进入香港科技大学王一组读博士，2019年进入斯德哥尔摩大学Bo Sundborg组做一期博后。2021年进入神户大学Toshifumi Noumi组做二期博后。现在为重庆大学副教授。主要研究引力波以及宇宙对撞机物理。
邀请人：
王少江 副研究员
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