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We express the two-massless-flavor Gell-Mann-Oakes-Renner ratio in terms of low-energy ππ observables including the O(p 6 ) double chiral logarithms of generalized chiral perturbation theory. Their contribution is sizeable and tends to compensate the one from the single chiral logarithms. However it is not large enough to spoil the convergence of the chiral expansion. As a signal of reduced...
We consider QCD at a nonzero chemical potential for strangeness. At a critical value of the chemical potential equal to the kaon mass, kaon condensation occurs through a continuous phase transition. We show that in the limit of exact isospin symmetry a Goldstone boson with the dispersion relation E∼p 2 appears in the kaon condensed phase. At the same time, the number of the Goldstone bosons...
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