Form factors in finite volume II: Disconnected terms and finite temperature correlators

Sine-Gordon multisoliton form factors in finite volume

“…In this paper we study form factors in finite volume, based on the approach developed in [20,21]. Finite volume form factors have also been studied in other approaches [22,23,24]; in addition, finite temperature form factors [25] are also related to this problem, as finite temperature is equivalent to compactified Euclidean time, and thus to a finite volume setting.…”

“…One of the advantages of the framework developed in [20,21] is that it allows for a direct comparison of solutions of the form factor axioms to field theory dynamics. This program has been successfully pursued in the case of diagonal scattering theories (those without particle mass degeneracies), both in the bulk and with boundary [20,21,26,27].…”

“…This program has been successfully pursued in the case of diagonal scattering theories (those without particle mass degeneracies), both in the bulk and with boundary [20,21,26,27]. However, an extension to theories with non-diagonal scattering is still missing.…”

“…[33]). The finite volume description of form factors can be used to develop a low-temperature and large-distance expansion for finite-temperature correlation functions [21,34,35], which could in turn be used to explain experimental data, e.g. from inelastic neutron scattering [36,34].…”

“…• To continue extending the description of finite volume form factors, initiated in [20,21], to theories with non-diagonal scattering.…”