Modular flavour symmetry: From fixed points to domain walls

by Dr Xin Wang

Wednesday 14 Jan 2026, 14:30 → 15:30 Europe/Rome

1/1-2 - Aula "C. Voci" (Dipartimento di Fisica e Astronomia - Edificio Marzolo)

Modular invariance offers an appealing solution to the flavour puzzle. In this talk, I will present a unified perspective on modular flavour symmetry, linking flavour phenomenology to early Universe cosmology through the fixed points in the modular space. I will begin by reviewing the application of modular symmetry in flavour physics, demonstrating the importance of fixed points in explaining the flavour mixing patterns. I will then discuss how the modular stabilisation mechanism can drive the modulus towards these fixed points, providing a dynamical origin for the observed flavour 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 flavour paradigm.

Locandina_Wang_seminario_1.pdf