Comments on “SU(2)—A Model Linking Superconductivity and Charge Density Waves—Does It Describe Basic Physics of Cuprate Superconductors?”

Charge density waves have been shown to compete with superconductivity in underdoped cuprate materials, so it is important to understand them. A recent theory links charge density waves and superconductivity via an approximate SU(2) symmetry. We give a simplified discussion of this theory and comment on the relationship of this theory to a few experiments, which suggest that it may give a model that captures the essential physics of high- $T_{{{c}}}$ cuprate superconductivity.