Folds in 2D String Theories

Details Folds in 2D String Theories Folds in 2D String Theories

1994-04-24

arxiv.org/abs/hep-th/9404149v1

Nucl.Phys. B427 (1994) 203-244

Physics

High Energy Physics

High Energy Physics - Theory

56 pages, latex, followed by epsf, 13 uuencoded epsf figures

Scientific paper

10.1016/0550-3213(94)90275-5

We study maps from a 2D world-sheet to a 2D target space which include folds. The geometry of folds is discussed and a metric on the space of folded maps is written down. We show that the latter is not invariant under area preserving diffeomorphisms of the target space. The contribution to the partition function of maps associated with a given fold configuration is computed. We derive a description of folds in terms of Feynman diagrams. A scheme to sum up the contributions of folds to the partition function in a special case is suggested and is shown to be related to the Baxter-Wu lattice model. An interpretation of folds as trajectories of particles in the adjoint representation of $SU(N)$ gauge group in the large $N$ limit which interact in an unusual way with the gauge fields is discussed.

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