Title: Classification of color superconductivity revisited
Date: Dec 4, 2025
Time: 14:00 - 15:00
Speaker: Prof. Yuki Fujimoto
Affiliation: Niigata University
Abstract: As interest in the dense region of the QCD phase diagram continues to grow, color superconductivity phenomenon becomes increasingly relevant. However, its phase structure, particularly the diquark pairing pattern below the CFL densities, remains unsettled to date. This uncertainty arises from multiple complications such as stress on the pairing induced by a strange quark mass.
In this talk, by focusing only on the homogeneous pairing, we give a classification of the color superconductivity based on the one-gluon exchange helicity amplitude at weak coupling. This object has been considered in the seminal work by Bailin and Love, but it has since been largely neglected in the community.
I demonstrate that the loss of Lorentz invariance in the dense medium, together with the decoupling of renormalization group equations, enables us to categorize the possible pairing pattern in color superconductivity in a manner analogous to the nonrelativistic case.
The talk is based on my recent papers, arXiv:2508.19222; 2508.19728