2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200456In a recent note Ellis criticizes varying speed of light theories on the grounds of a number of foundational issues. His reflections provide us with an opportunity to clarify some fundamental matters pertaining to these theories.General Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Phenomenologytext