I outline a new hypothetical approach issuing a
second gravitational equation in the scope of a promising model tackling the
gravitational wave problem. This wave equation for graviton is framed in the
endeavour to bridge the puzzling missing link to allow for quantum scale
physics in a unifying gravity theory, through a new coupling constant S: thus wave is regarded as a symmetry
breaking of general covariance of field equations through contraction of
Riemann tensor by a constant tensor. That also allows an inertial mass to be
assigned to the graviton (OE-25 eV/c2). This extension of
General Relativity stems from self-evident considerations on the differential
conditions of compatibility involving the two fundamental tensors on the
curvature of the Space-Time continuum. Some considerations about last detected
events are broached on the gauging of S constant, bringing forth a value that differs of two orders of magnitude with
respect to the fitting of known binary star systems, unless source parameters are
revised.
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