2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200684In this paper I show how the second law of thermodynamics, generalized to include event horizon area, places interesting constraints on the value of the fine structure constant. A simple analysis leads to the conclusion that classical Dirac and point-like magnetic monopoles could be used to violate the second law, and that GUT monopoles are inconsistent with minicharged particles.6 pages, no figures, journal publicationGeneral Relativity and Quantum Cosmologytext