2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49707This talk describes some of the consequences for particle phenomenology of the hypothesis that the physical parameters may vary in different domains of the universe.3 pages, talk at European Phsical Society HEP conference, Tampere Finland, July 1999 - to be published in the proceedingsHigh Energy Physics - Phenomenologytext