Boundary form factors in finite volume

Details Boundary form factors in finite volume Boundary form factors in finite volume

2007-12-12

arxiv.org/abs/0712.1886v2

Nucl.Phys.B803:277-298,2008

Physics

High Energy Physics

High Energy Physics - Theory

v1: 25 pages, 12 eps figures, LaTex2e file. v2: a new eps figure and some explanatory notes added

Scientific paper

10.1016/j.nuclphysb.2008.05.003

We describe the volume dependence of matrix elements of local boundary fields to all orders in inverse powers of the volume. Using the scaling boundary Lee-Yang model as testing ground, we compare the matrix elements extracted from boundary truncated conformal space approach to exact form factors obtained using the bootstrap method. We obtain solid confirmation for the boundary form factor bootstrap, which is different from all previously available tests in that it is a non-perturbative and direct comparison of exact form factors to multi-particle matrix elements of local operators, computed from the Hamiltonian formulation of the quantum field theory.

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