An Effective Complex-Bimetric Negentropic-Sector Model for Dark Matter and Cosmic Acceleration

We propose an effective complex-bimetric framework in which dark matter and cosmic acceleration arise as two distinct real gravitational projections of an orthogonal informational sector. The construction is based on a bimetric complex manifold \(Gμν=gμν+i fμν\), where \(gμν\) denotes the ordinary visible-sector spacetime metric and \(fμν\) denotes a negentropic metric associated with maintained informational order. The factor \(i\) is not interpreted as a literal imaginary spacetime interval, but as a topological index encoding orthogonality between thermodynamic embodiment and informational geometry. The Standard Model is coupled minimally to \(gμν\), while a scalar-order sector and massive informational excitations propagate on \(fμν\). Localized excitations behave as pressureless dark matter, whereas the vacuum energy of the order parameter behaves as an effective negative-pressure component capable of sourcing cosmic acceleration. The effective graviton mass bridging the two metrics is dynamically generated via a Hassan--Rosen-type bimetric interaction, modulated by the negentropic scalar. We further introduce an emergy-inspired interpretation of the real sector and a complex value functional combining thermodynamic memory and informational order. The resulting model is presented as a phenomenological effective field theory, with consistency conditions from ghost freedom, stability, gravitational-wave propagation, and cosmological observables.