2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36074Through dimensional analysis, eliminating the physical time, we identify the speed of light as a dilaton field. This leads to a restmass zero, spin zero gauge field which we call the speedon field. The complete Lagrangian for gravitational, electromagnetic and speedon field interactions with a charged scalar field, representing matter, is given. We then find solutions for the gravitational-electromagnetic-speedon field equations. This then gives an expression for the speed of light.21 pages, TeX, corrected some typosGeneral Relativity and Quantum Cosmologytext