2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98898The conservative model of a black hole is advanced. The model incorporates conservation laws such as those of baryon and lepton numbers, which lifts the information loss paradox. A scenario of black hole evaporation is considered. Keywords: entropy, emission, radiation, universe, chemical potential8 pages, LATEX 2.09General Relativity and Quantum CosmologyHigh Energy Physics - Theorytext