Departamento de Física y Química Teórica
Facultad de Química
Universidad Nacional Autónoma de México
AP 70-528, 04510, México D.F., México
e-mail: keller@cms.tuwien.ac.at

General Relativity as a Symmetry of a Unified Space--Time--Action Geometrical Space

Abstract:
In order to unify electromagnetism and gravitation we derive the basic principles of both approaches from a common (geometrical) starting formulation we call START, from its geometrical structure as a Space--Time--Action Relativity Theory. Gravitation results from the epistemological approach of defining a test particle which explores  the physical world in such a form that its trajectory indicates the influence of the rest of the system. Electromagnetism defines a collection of test particles, we call carriers, in interaction among themselves and with the rest of the system. Once both approaches have been formally defined we can unify gravitation and electromagnetism either within one or the other formalisms.