2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/224513We analyze the possibility of inequivalent boundary conditions for a scalar field propagating in the BTZ black hole space-time. We find that for certain ranges of the black hole parameters, the Klein-Gordon operator admits a one-parameter family of self-adjoint extensions. For this range, the BTZ space-time is not quantum mechanically complete. We suggest a physically motivated method for determining the spectra of the Klein-Gordon operator.6 pages, no figure, latexHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext