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Boundary states for chiral symmetries in two dimensions
Journal of High Energy Physics
We study boundary states for Dirac fermions in d = 1 + 1 dimensions that preserve Abelian chiral symmetries, meaning that the left-and right-moving fermions carry different charges. We derive simple expressions, in terms of the fermion charge assignments, for the boundary central charge and for the ground state degeneracy of the system when two different boundary conditions are imposed at either end of an interval. We show that all such boundary states fall into one of two classes, related todoi:10.1007/jhep09(2020)018 fatcat:gx5ltdf4a5finpv52xftu6okuu