Mass, Proper Time, and Gravity — Part LIII: Frozen-Frame Superposition and Geometric Decoherence

This record is part of the Mass, Proper Time, and Gravity series.

Full series community:
https://zenodo.org/communities/mass-proper-time-gravity/

This part gives the synthesis of the frozen-frame route developed after the effective causal-history partition function of Part LII. The claim is not that ADM constraints, gravitational decoherence, or quantum measure theory are new. The contribution is the operational causal-set chain that places them in one sequence: causal order -> proper time -> frozen screen -> energy density -> spatial 3-geometry -> gravitational self-energy of the geometric difference -> decoherence functional. A causal order supplies a proper-time slicing; on a frozen screen the ADM Hamiltonian constraint ties energy to spatial geometry; a matter superposition therefore becomes a superposition of screen geometries; and classicality is read as decoherence between gravitationally distinguishable geometry branches (Diosi-Penrose), not as objective collapse. Each link is graded explicitly as established, prototype-level, conjectural, or open. This is a continuation of Parts I-LII of the same program.