Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-17
Phys.Rev.Lett.96:012305,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, one figure, revised version, to appear in PRL (title changed in journal)
Scientific paper
10.1103/PhysRevLett.96.012305
We study the effect of a non-zero strange quark mass on the color-flavor-locked (CFL) phase of high density quark matter. We have previously shown that for a strange quark mass $m_s\sim m_u^{1/3}\Delta^{2/3}$ the CFL state becomes unstable toward the formation of a neutral kaon condensate. Recently, several authors discovered that for $m_s\sim (2\Delta p_F)^{1/2}$ the CFL state contains gapless fermions, and that the gapless modes lead to an instability in current-current correlation functions. Using an effective theory of the CFL state we demonstrate that this instability is resolved by the formation of an inhomogeneous meson condensate, analogous to Migdal's p-wave pion condensate. This state has a non-zero meson current which is canceled by a backflow of gapless fermions.
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