The 4th International BSM Workshop: Building for Tomorrow

Session

Plenary talks (1)

25 Aug 2025, 09:00

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

87. Multi-axion dynamics and a new resolution of the QCD domain wall problem

Prof. Fuminobu Takahashi (Tohoku University)

25/08/2025, 09:00

We study the evolution of topological defects in multi-axion models and propose a novel solution to the domain wall problem of the QCD axion.

Multi-axion dynamics, arising from multiple Peccei–Quinn scalars, can lead to qualitatively different defect evolution compared to single-axion models. In particular, networks of cosmic strings and high-tension domain walls tend to form, posing a...

116. Hunting for axions in rector neutrino experiment

Lei Wu

25/08/2025, 09:30

115. Machine Learning in the Precision Era

Lingfeng Li

25/08/2025, 10:30

114. Axion Magnetic Resonance in Low-Energy Precision Experiments

Chen Sun

25/08/2025, 11:00

It is well-known that axions and photons can coherently convert into each other in a background magnetic field, a phenomenon commonly observed in a mixed two-level quantum system such as neutrino oscillations and nuclear spin processions. Similar to the nuclear magnetic resonance and spin flips in a qubit system, we point out that an periodic (in time or space) background magnetic field can...

120. Light particle emissions from cosmic strings

Naoya Kitajima

25/08/2025, 11:30

Cosmic string is a topological defect associated with the spontaneous symmetry breaking in the early universe. After the formation of cosmic strings, they form a network and evolve following the scaling regime. In this talk, I present light particle emissions from the cosmic string network. In particular, I focus on the procudtion of the axion and other pseudo-Nambu-Goldstone bosons and show...