报告人：孙冠豪（重庆大学）

报告时间：２０２５年１１月７日（周五）下午２：１５，

地点：物理楼１０６

 摘要： 

   Equal-time in-in correlation functions are important observables for cosmological models and quantum field theories. In this talk, I will explore how the Wilsonian renormalization group and effective field theory (EFT) apply to these observables in both flat and de Sitter space. Specifically, matching the UV and IR requires additional terms not captured by conventional EFT. These terms are localized at the time of the measurement, and (semi-)local in space. In flat spacetime, an explicit matching calculation is given for in-in correlators of light scalars interacting with a heavy field. I will then show how these additional terms arise generically via exact RG. Finally, I will check the corresponding theory in de Sitter and show that the local terms typically redshift away. Some ongoing and potential future follow works will be briefly discussed at the end.