An Abelian Ward identity and the vertex corrections to the color superconducting gap

Abstract

We derive an Abelian-like Ward identity in color superconducting phase and calculate vertex corrections to the color superconducting gap. Making use of the Ward identity, we show that subleading order contributions to the gap from vertices are absent for gapped excitations.

Comments: RevTex 4, 11 pages, 4 figures