The Boundary sine-Gordon theory: Classical and semiclassical analysis

Jul, 1994
23 pages
Published in:
  • Nucl.Phys.B 441 (1995) 421-436
e-Print:
Report number:
  • USC-94-013

Citations per year

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Abstract:
We consider the sine-Gordon model on a half-line, with an additional potential term of the form Mcosβ2(φφ0)-M\cos{\beta\over 2}(\varphi-\varphi_0) at the boundary. We compute the classical time delay for general values of MM, β\beta and φ0\varphi_0 using τ\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.
  • sine-Gordon model
  • field theory: conformal
  • dimension: 2
  • field theory: action
  • field equations: soliton
  • S-matrix
  • approximation: semiclassical
  • numerical calculations