D. Daniel, A. Gonzalez-Arroyo, C.P. Korthals-Altes and B. Söderberg
Energy Spectrum of SU(2) Yang-Mills Fields with Space-Like Symmetric Twist
Physics Letters B 221:2, 136-142 (1989)

We compute the energy levels of an SU(2) Yang-Mills field in perturbation theory to order g2, for a box of finite size and symmetric twist m = (1,1,1). A cubic-invariant spectrum results, with almost degenerate E++ and T2++. Various suggestions for further MC measurements are made.