http://popups.lib.uliege.be/1373-5411/index.php?id=1729 Index terms fr 0 http://popups.lib.uliege.be/1373-5411/index.php?id=1726 Because a scalar potential of a gravitational field has a unit of a specific energy (J/kg), the problem of unification of potential fields has been transformed into the problem of unification of specific potential energies of a particle in a multi-potential field. Consequently, the parameter α and α' of GLT model become the functions of a unified specific potential energy in a multi-potential field. Since all items like field tensors and Klein, Gordon and Fock equation are functions of parameters α and α', these items can be applied to multi-potential fields. Thus, a field tensor of a unified specific potential energy of a particle in central symmetric electromagnetic and gravitational fields in vacuum is derived. Finally, it has been shown that a momentum equation of photons will remain unchanged even if the photons may have the mass. Tue, 16 Jul 2024 14:18:53 +0200 Tue, 16 Jul 2024 14:19:03 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=1726