Interaction between electromagnetism and gravitation from unified geometric framework

An alternative formulation of classical electromagnetism relying on torsion in metrically flat spacetime in four dimensions is presented. Unification with gravitation is then obtained as a direct consequence of the extension to the more general case of metrically curved spacetime. A propagating equation for the electromagnetic potential is derived and discussed. In the same context, it is also shown that a second kind of photon can be predicted (which could be the so-called “Dark Photon”) and how it can be distinguished from the known photon in presence of gravitation. Modeling of binary neutron star and black hole-neutron star mergers, and of their electro-