Defect Lines in the Ising Model and Boundary States on Orbifolds

Abstract

Critical phenomena in the two-dimensional Ising model with a defect line are studied using boundary conformal field theory on the $c=1$ orbifold. Novel features of the boundary states arising from the orbifold structure, including continuously varying boundary critical exponents, are elucidated. New features of the Ising defect problem are obtained including a novel universality class of defect lines and the universal boundary to bulk crossover of the spin correlation function.

9 pages, 2 figures in EPS and LaTeX attached (References added + Minor corrections)

References in corpus (1)

• Dirichlet-Branes and Ramond-Ramond Charges

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