The Einstein’s program permits to conciliate gravitation and
electromagnetism. Besides the standard model, it forms a consistent system for
universe description, founded upon a scalar field propagating at the speed of
light c. Matter corresponds to standing waves. Adiabatic variations of
frequencies lead to electromagnetic interaction constituted by progressive
waves. Classical domain corresponds to geometrical optics approximation, when
frequencies are infinitely high, and then hidden. As interactions for matter,
Gravitation and Electromagnetism derive from variations of its energy E = mc2.
Electromagnetic interaction energy derives from mass variation dE = c2dm,
and gravitation from speed of light variation dE = mdc2. Contrarily
to gravitation, only electromagnetic interaction serves as a bridge between
classical and quantum frames, since it leans directly upon the wave property of
matter: its energy dE = hdν = c2dm derives from variations of matter
energy E = hν = mc2.