2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/187923The combination of the Lorentz symmetry and the strong subadditive property of the entropy leads to a c-theorem for the entanglement entropy in 1+1 dimensions. We present a simple derivation of this theorem and compare the associated c-functions with the Zamolodchikov's ones for the case of free fields. We discuss the various difficulties which obstacle the naive generalizations of the entropic c-theorem to higher dimensions.6 pages, 2 figures. Talk given at the conference IRGAC 2006: 2nd. Intern. Conf. on Quantum Theories and Renormalization Group in Gravity and Cosmology (Barcelona, jun. 2006). Reference addedStatistical MechanicsHigh Energy Physics - Theorytext