Masses of the Goldstone modes in the CFL phase of QCD at finite density
Cristina Manuel, Michel H. G. Tytgat
Abstract
We construct the UL(3) x UR(3) effective lagrangian which encodes the dynamics of the low energy pseudoscalar excitations in the Color-Flavor-Locking superconducting phase of QCD at finite quark density. We include the effects of instanton-induced interactions and study the mass pattern of the pseudoscalar mesons. A tentative comparison with the analytical estimate for the gap suggests that some of these low energy momentum modes are not stable for moderate values of the quark chemical potential.
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