Spin injection into strongly interacting matter as a probe to the topological sector in gauge systems

A rapidly rotating system of strongly interacting matter at high temperature and density has been created and observed in relativistic heavy-ion collision experiments. However, the theoretical framework for describing the dynamical evolution of spin degrees of freedom still requires further development. In this research project, we have formulated a thermodynamic system in which spin is introduced as an external environmental parameter, and we have investigated the thermal properties induced by spin. We have discovered that the spin carried by gauge particles is closely related to the topological current in the gauge sector, opening a novel direction for exploring the nonperturbative nature of hot and dense matter.