2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52980We study the Goursat or characteristic problem, i.e. a hyperbolic equation with given data on a surface (the half of the standard Cauchy problem), with some kind of dimensional regularization procedure to deal with the divergences that appear. We will also comment some possible relation with a holographic setup.5 pages. To appear in the proceedings of 27th Spanish Relativity Meeting: Beyond General Relativity (ERES 2004), Madrid, Spain, 23-25 Sep 2004High Energy Physics - Theorytext