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

2007/06/25 by Balázs Pozsgay, B. Pozsgay, G. Takács +1 · 2 citations
Mathematics · Physics and Astronomy · #Algebraic structures and combinatorial models #Black Holes and Theoretical Physics #Nonlinear Waves and Solitons #cond-mat.other #hep-lat #hep-th

paper · pdf · doi:10.1016/j.nuclphysb.2007.07.008

published as Nucl.Phys.B788:209-251,2008 · 44 pages, 16 eps figures, LaTeX2e file

arxiv created 2007/06/25 · openalex publication_date 2007/07/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Continuing the investigation started in a previous work, we consider form factors of integrable quantum field theories in finite volume, extending our investigation to matrix elements with disconnected pieces. Numerical verification of our results is provided by truncated conformal space approach. Such matrix elements are important in computing finite temperature correlation functions, and we give a new method for generating a low temperature expansion, which we test for the one-point function up to third order.

Citations

• Quantum Inverse Scattering Method and Correlation Functions
• Characterization of resonances using finite size effects
• Asymptotic factorisation of form factors in two-dimensional quantum field theory

Cited by

• Form factor expansion for thermal correlators
• Form factors in finite volume I: Form factor bootstrap and truncated conformal space