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Masses of the Goldstone modes in the CFL phase of QCD at finite density

Cristina Manuel·Michel H. G. Tytgat
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Abstract

We construct the U_L(3) x U_R(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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Cristina Manuel, Michel H. G. Tytgat. 2000-02-10. Masses of the Goldstone modes in the CFL phase of QCD at finite density. https://doi.org/10.1016/s0370-2693(00)00331-2

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