Modular flavor symmetry: From fixed points to domain walls

by Dr Xin Wang （王鑫） (University of Southampton/University of Padua)

Wednesday 10 Dec 2025, 10:00 → 11:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N601 - Meeting Room (Tsung-Dao Lee Institute)

Abstract:
Modular invariance offers an appealing solution to the flavor puzzle. In this talk, I will present a unified perspective on modular flavor symmetry, linking flavor phenomenology to early Universe cosmology through the fixed points in the modular space. I will begin by reviewing the application of modular symmetry in flavor physics, demonstrating the importance of fixed points in explaining the flavor mixing patterns. I will then discuss how the modular stabilization mechanism can drive the modulus towards these fixed points, providing a dynamical origin for the observed flavor parameters. Finally, I will focus on the cosmological consequences of this framework, with particular emphasis on modular domain walls. I will discuss their formation and collapse, showing that the resulting gravitational wave spectra offer a unique window to probe the modular flavor paradigm.

Biography:
Dr. Xin Wang received his Ph.D. in Theoretical Physics from the Institute of High Energy Physics (IHEP), Chinese Academy of Sciences in 2022. He subsequently conducted postdoctoral research at Peking University and the University of Southampton, and will join the University of Padua as a postdoctoral researcher in the beginning of 2026. His main research interests lie in particle cosmology and astronomy, with a focus on the origin of neutrino mass, the evolution of the early universe, and astrometry-based detection of gravitational waves and dark matter.

Alternative online link：https://meeting.tencent.com/dm/SnxuBz9m5DF8

ID: 442536331