2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34031An example of discontinuity of the energy-momentum tensor moving at superluminal velocity is discussed. It is shown that the gravitational Mach cone is formed. The power spectrum of the corresponding Cherenkov radiation is evaluated.9 pages, 1 figure, LaTeX2eGeneral Relativity and Quantum Cosmologytext