2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105267It is shown that under the post-Newtonian approximation the Einstein equations can be reduced to the standard Maxwell-type field equations in a medium; in such a context the Cerenkov emission by a neutralparticle gives large energy loss while the particle moves at faster than the phase speed of waves in the medium.submit to GRGPlasma PhysicsFluid Dynamicstext