Why Cold, Dense Quark Matter could be “Quarkyonic”

I give a pedagogical review of how cold, dense quark matter can 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.