Gravitational wave from current-carrying domain walls

by Prof. Yu HAMADA (University of Osaka)

Thursday 14 May 2026, 11:00 → 12:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Abstract:

 

Domain wall (DW) networks may have formed in the early universe following the spontaneous breaking of a discrete symmetry. Several BSM models predict the existence of current-carrying DWs, which can capture and store particles as localized zero modes. In this work, we show that gravitational wave (GW) generated by current-carrying DWs with fermionic zeromodes exhibit an additional peak in the GW spectrum arising from metastable remnants. This signature could be detectable in upcoming GW observatories such as LISA. The results suggest that DW networks could emit GW signals that are significantly stronger and with greater detectability than previously expected.

 

Biography:

 

Yu HAMADA  received his Doctor of Science from Kyoto University in 2021. He was a JSPS Postdoctoral Fellow at KEK from 2021 to 2023 and at DESY from 2023 to 2026. Since 2026, he has been an Assistant Professor at The University of Osaka. His research focuses on particle phenomenology and cosmology, including topological defects, gravitational waves. He has authored 32 research publications to date and has received several awards, including "Particle Physics Medal: Young Scientist Award in Theoretical Particle Physics" in 2023 and "Young Scientist Award of the Physical Society of Japan" in 2025.