Finitized Conformal Spectra of the Ising Model on the Klein Bottle and Moebius Strip.pdf

Finitized Conformal Spectra of the Ising Model on the Klein Bottle and Moebius Strip.pdf

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Finitized Conformal Spectra of the Ising Model on the Klein Bottle and Moebius Strip

a r X i v : h e p - t h / 0 1 0 5 2 3 3 v 2 1 3 M a r 2 0 0 2 Finitized Conformal Spectra of the Ising Model on the Klein Bottle and Mo?bius Strip C. H. Otto Chui? and Paul A. Pearce? Department of Mathematics and Statistics University of Melbourne Parkville, Victoria 3010, Australia May, 2001 Abstract We study the conformal spectra of the critical square lattice Ising model on the Klein bottle andMo?bius strip using Yang-Baxter techniques and the solution of functional equations. In particular, we obtain expressions for the finitized conformal partition functions in terms of finitized Virasoro characters. This demonstrates that Yang-Baxter techniques and functional equations can be used to study the conformal spectra of more general exactly solvable lattice models in these topologies. The results rely on certain properties of the eigenvalues which are confirmed numerically. Key Words: Conformal field theory; Ising model; klein bottle; mo?bius strip. 1 Introduction There has been much recent progress on understanding general conformal boundary conditions for rational theories on the cylinder [1] and torus [2] and their relation [3] to integrable boundary conditions on the lattice. It is therefore of some interest to extend this understanding to other topologies such as the Klein bottle and Mo?bius strip. However, while much is known [4, 5, 6] about conformal partition functions in these topologies from the viewpoint of string theory, very little is known about integrable lattice boundary conditions on the Klein bottle and Mo?bius strip. Indeed, ?e-mail: C.Chui@ms.unimelb.edu.au ?e-mail: P.Pearce@ms.unimelb.edu.au 1 ?? ? ? ? ? ? ? u u λ?u λ?u u u λ?u λ?u ? ? ∧ ∧ u u λ?u λ?u u u λ?u λ?u ? ? ? ? ? ? ? ? ? ? Figure 1: Klein bottle (left) Mo?bius strip (right). The boundaries are joined ac- cording to the orientations indicated by the arrows. The arrows at the bottom left corners on each face weight indicate its orientation. the lattice Yang-Baxter techniques which

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