2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185518Two different theoretical formulations of the finite temperature effects have been recently proposed for integrable field theories. In order to decide which of them is the correct one, we perform for a particular model an explicit check of their predictions for the one-point function of the trace of the stress-energy tensor, a quantity which can be independently determined by the Thermodynamical Bethe Ansatz.12 pages, corrected some typos and an equationHigh Energy Physics - Theorytext