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On the representation of minimal form factors in integrable quantum field theory
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Modena and Reggio Emilia, Italy.
Number of Authors: 32024 (English)In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 1000, article id 116459Article in journal (Refereed) Published
Abstract [en]

In this paper, we propose a new representation of the minimal form factors in integrable quantum field theories. These are solutions of the two -particle form factor equations, which have no poles on the physical sheet. Their expression constitutes the starting point for deriving higher particle form factors and, from these, the correlation functions of the theory. As such, minimal form factors are essential elements in the analysis of integrable quantum field theories. The proposed new representation arises from our recent study of form factors in TT -perturbed theories, where we showed that the minimal form factors decompose into elementary building blocks. Here, focusing on the paradigmatic sinh-Gordon model, we explicitly express the standard integral representation of the minimal form factor as a combination of infinitely many elementary terms, each representing the minimal form factor of a generalised TT perturbation of the free fermion. Our results can be readily extended to other integrable quantum field theories and open various relevant questions and discussions, from the efficiency of numerical methods in evaluating correlation functions to the foundational question of what constitutes a reasonable choice for the minimal form factor.

Place, publisher, year, edition, pages
2024. Vol. 1000, article id 116459
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-227729DOI: 10.1016/j.nuclphysb.2024.116459ISI: 001181874100001Scopus ID: 2-s2.0-85184015148OAI: oai:DiVA.org:su-227729DiVA, id: diva2:1847147
Available from: 2024-03-26 Created: 2024-03-26 Last updated: 2024-11-13Bibliographically approved

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Szécsényi, István M.

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