Classically integrable boundary conditions for symmetric-space sigma models

Details Classically integrable boundary conditions for symmetric-space sigma models Classically integrable boundary conditions for symmetric-space sigma models

2004-02-23

arxiv.org/abs/hep-th/0402182v2

Phys.Lett. B588 (2004) 221-227

Physics

High Energy Physics

High Energy Physics - Theory

8 pages. v2 has an introduction added and a few minor corrections

Scientific paper

10.1016/j.physletb.2004.03.037

We investigate boundary conditions for the nonlinear sigma model on the compact symmetric space $G/H$, where $H \subset G$ is the subgroup fixed by an involution $\sigma$ of $G$. The Poisson brackets and the classical local conserved charges necessary for integrability are preserved by boundary conditions in correspondence with involutions which commute with $\sigma$. Applied to $SO(3)/SO(2)$, the nonlinear sigma model on $S^2$, these yield the great circles as boundary submanifolds. Applied to $G \times G/G$, they reproduce known results for the principal chiral model.

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