Symmetry, Integrability and Geometry: Methods and Applications (SIGMA)

SIGMA 3 (2007), 011, 37 pages      hep-th/0611066      https://doi.org/10.3842/SIGMA.2007.011
Contribution to the Proceedings of the O'Raifeartaigh Symposium

Finite-Temperature Form Factors: a Review

Benjamin Doyon
Rudolf Peierls Centre for Theoretical Physics, Oxford University, 1 Keble Road, Oxford OX1 3NP, U.K.

Received October 09, 2006, in final form December 07, 2006; Published online January 11, 2007

Abstract
We review the concept of finite-temperature form factor that was introduced recently by the author in the context of the Majorana theory. Finite-temperature form factors can be used to obtain spectral decompositions of finite-temperature correlation functions in a way that mimics the form-factor expansion of the zero temperature case. We develop the concept in the general factorised scattering set-up of integrable quantum field theory, list certain expected properties and present the full construction in the case of the massive Majorana theory, including how it can be applied to the calculation of correlation functions in the quantum Ising model. In particular, we include the ''twisted construction'', which was not developed before and which is essential for the application to the quantum Ising model.

Key words: finite temperature; integrable quantum field theory; form factors; Ising model.

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