7-Gravitational Consequences of a Conjugated Vacuum Structure

Recent structural analyses of vacuum energy have shown that finite and stable vacuum residues cannot arise from a single spectral contribution, but require the comparison of at least two conjugated sectors sharing the same asymptotic behavior. A minimal physical realization of this requirement was recently proposed in the form of a two-sector vacuum structure, referred to as the Janus vacuum.In this work, we investigate the gravitational consequences of such a conjugated vacuum structure.We show that coupling a two-sector vacuum to gravity fundamentally constrains the gravitational response itself. In particular, a purely monometric description is generically inconsistent with the structural cancellation of vacuum energy and leads to instabilities under geometric perturbations.Consistency instead points toward a conjugated gravitational structure, in which the geometricresponse mirrors the two-sector organization of the vacuum. Within this framework, dominant vacuum energy contributions cancel naturally, eliminating the need for fine-tuning, dynamical screening, or anthropic mechanisms. Residual gravitational effects arise only from subleading structuralasymmetries and are therefore finite and stable.These results provide the minimal gravitational completion of a conjugated vacuum structure andestablish a consistent foundation for further investigations of its cosmological implications.