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报告题目：Specially Embedding a Composite Axion Model

报告嘉宾：Shihwen Hor，上海交通大学 博士后

报告时间：2026年10月12日 10:00

报告地点：女性自慰-女人自慰-女性自慰工具 中心校区物理楼323会议室        

主持人：Takumi Kuwahara

报告摘要

　　We present a novel framework of the post-inflationary composite axion to address the strong CP problem without the cosmological domain wall problem. Conventional composite axion models lead to the domain wall number greater than one, producing stable axion domain walls that overclose the Universe. We show that by considering a special embedding of the confining gauge group responsible for the composite axion as well as QCD into a larger product gauge group, the domain wall number is essentially set to unity in the ultraviolet (UV) theory. In this setup, small instanton effects associated with the UV gauge dynamics induce a controlled explicit breaking of the residual discrete symmetry, providing a bias term in the axion potential. As a result, the domain walls become unstable and decay sufficiently quickly, while the axion solution to the strong CP problem remains intact. We construct an explicit realization of this framework, identify a viable parameter region and analyze the axion dark matter abundance. Decays of exotic hadrons from the composite dynamics are also investigated. Our special-embedding UV completion renders the domain wall problem in composite axion models cosmologically harmless.

嘉宾简介

　　Shihwen Hor is a postdoctoral researcher at Tsung-Dao Lee Institute (TDLI), Shanghai JiaoTong University. She received her Ph.D from University of Tokyo in 2024 and has worked at University of Tokyo as a postdoctoral researcher until joining TDLI in 2025. Her research interests focus on particle phenomenology, in particular grand unification and model building for composite axion. She has published papers in PRD, JHEP, and so on.

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女性自慰-女人自慰-女性自慰工具

女性自慰-女人自慰-女性自慰工具 理论物理中心