Why Cold, Dense Quark Matter could be "Quarkyonic"

I give a pedagogical review of how cold, dense quark matter call be viewed as "Quarkyonic", at least when the number of colors is large (and the number of flavors, small). This provides a different way of viewing the excitation spectrum of dense quarks. while the free energy is, up to power law corrections; close to that of free quarks, the excitation spectrum is very different, dominated by confined, collective excitations near the Fermi surface.