Boundary scattering, symmetric spaces and the principal chiral model on the half-line

Details Boundary scattering, symmetric spaces and the principal chiral model on the half-line Boundary scattering, symmetric spaces and the principal chiral model on the half-line

2001-04-24

arxiv.org/abs/hep-th/0104212v3

Commun.Math.Phys. 233 (2003) 313-354; Erratum-ibid. 245 (2004) 425-428

Physics

High Energy Physics

High Energy Physics - Theory

52 pages; v3 corrects an error in the statement of crossing-unitarity, allowing greater freedom in some reflection matrices

Scientific paper

10.1007/s00220-002-0735-y

We investigate integrable boundary conditions (BCs) for the principal chiral model on the half-line, and rational solutions of the boundary Yang-Baxter equation (BYBE). In each case we find a connection with (type I, Riemannian, globally) symmetric spaces G/H: there is a class of integrable BCs in which the boundary field is restricted to lie in a coset of H; these BCs are parametrized by G/H x G/H; there are rational solutions of the BYBE in the defining representations of all classical G parametrized by G/H; and using these we propose boundary S-matrices for the principal chiral model, parametrized by G/H x G/H, which correspond to our boundary conditions.

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