A lattice approach to the conformal OSp(2S+2|2S) supercoset sigma model. Part II: The boundary spectrum

We consider the partition function of the boundary OSp(2S+2|2S) coset sigma model on an annulus, based on the lattice regularization introduced in the companion paper. Using results for the action of OSp(2S+2|2S) and BL(2) on the corresponding spin chain, as well as mini-superspace and small gσ2 calculations, we conjecture the full spectrum and set of degeneracies on the entire critical line. Potential relationship with the OSp(2S+2|2S) Gross-Neveu model is also discussed.