One-point functions in massive integrable QFT with boundaries

Details One-point functions in massive integrable QFT with boundaries One-point functions in massive integrable QFT with boundaries

2010-02-15

arxiv.org/abs/1002.2783v2

JHEP04(2010)112

Physics

High Energy Physics

High Energy Physics - Theory

43 pages, 20 figures, v2: typos corrected

Scientific paper

10.1007/JHEP04(2010)112

We consider the expectation value of a local operator on a strip with non-trivial boundaries in 1+1 dimensional massive integrable QFT. Using finite volume regularisation in the crossed channel and extending the boundary state formalism to the finite volume case we give a series expansion for the one-point function in terms of the exact form factors of the theory. The truncated series is compared with the numerical results of the truncated conformal space approach in the scaling Lee-Yang model. We discuss the relevance of our results to quantum quench problems.

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