The boundary sine-Gordon theory: classical and semi-classical analysis

Details The boundary sine-Gordon theory: classical and semi-classical analysis The boundary sine-Gordon theory: classical and semi-classical analysis

1994-08-01

arxiv.org/abs/hep-th/9408004v2

Nucl.Phys.B441:421-436,1995

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, 5 figures. Preprint USC-94-013. (Numerical mistake corrected.)

Scientific paper

10.1016/0550-3213(95)00021-J

We consider the sine-Gordon model on a half-line, with an additional potential term of the form $-M\cos{\beta\over 2}(\varphi-\varphi_0)$ at the boundary. We compute the classical time delay for general values of $M$, $\beta$ and $\varphi_0$ using $\tau$-function methods and show that in the classical limit, the method of images still works, despite the non-linearity of the problem. We also perform a semi-classical analysis, and find agreement with the exact quantum S-matrix conjectured by Ghoshal and Zamolodchikov.

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