Speaker
Yuki Fujimoto
(Niigata University)
Description
Color superconductivity arises from the Cooper logarithm near the quark Fermi surface. Conventional gap equations organized by total angular momentum can obscure distinct spin-orbital pairing channels; for example, the $J=0$ sector contains both ${}^{1}S_0$ and ${}^{3}P_0$. We revisit this problem using one-gluon-exchange helicity amplitudes and a renormalization-group theory near the Fermi surface. The RG flow resolves independent channels labeled by color, flavor, helicity, and ${}^{2S+1}L_J$, while reproducing the known weak-coupling gap. This framework reveals the competition among pairing patterns, including dominant ${}^{1}S_0$ and ${}^{1}P_1$ channels and medium-induced attraction in color-sextet channels.
Author
Yuki Fujimoto
(Niigata University)