2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228084In this paper we apply the entropy function formalism to the two-dimensional black hole which come from the compactification of the heterotic string theory with the dilaton coupling function. We find the Bekenstein-Hawking entropy from the value of the entropy function at its saddle point. Also we consider higher derivative terms. After that we apply the entropy function formalism to the Jackiw-Teitelboim (JT) model where we consider the effect of string-loop to this model.6 pages, no figuresHigh Energy Physics - Theorytext