Spontaneous symmetry breaking with abnormal number of Nambu-Goldstone bosons and kaon condensate.
We describe a class of relativistic models incorporating a finite density of matter in which spontaneous breakdown of continuous symmetries leads to a lesser number of Nambu-Goldstone bosons than that required by the Goldstone theorem. This class, in particular, describes the dynamics of the kaon condensate in the color-flavor locked phase of high density QCD. We describe the spectrum of low energy excitations in this dynamics and show that, despite the presence of a condensate and gapless excitations, this system is not a superfluid.
Miransky
V A
VA
Department of Applied Mathematics, University of Western Ontario, London, Ontario, Canada N6A 5B7.
Shovkovy
I A
IA