Complex eigenvalue instantons and the Fredholm determinant expansion in the Gross-Witten-Wadia model

Dan Stefan Eniceicu, Raghu Mahajan, Chitraang Murdia

We study the leading nonperturbative corrections to the strong-coupling (ungapped) phase of the Gross-Witten-Wadia (GWW) integral over unitary matrices, to one-loop order. We compu…