Diagonal finite volume matrix elements in the sinh-Gordon model
arXiv:1903.06990 · doi:10.1016/j.nuclphysb.2019.114664
Abstract
Using the fermionic basis we conjecture exact expressions for diagonal finite volume matrix elements of exponential operators and their descendants in the sinh-Gordon theory. Our expressions sum up the LeClair-Mussardo type infinite series generalized by Pozsgay for excited state expectation values. We checked our formulae against the Liouville three-point functions for small, while against Pozsgay's expansion for large volumes and found complete agreement.
19 pages, 1 figure