<b>Observational Signatures: Testing the Photonic Gel Boundary Theory</b>

This paper presents specific observational predictions arising from the photonic gel boundary theory, offering concrete ways to test the model against astronomical data. It details how the boundary's dynamics should produce distinctive signatures in gravitational wave signals, cosmic microwave background polarization patterns, and large-scale structure formation. By outlining these observational tests, the paper provides a roadmap for validating or refuting the boundary theory through current and next-generation astronomical instruments and surveys.