Quantum Phase Space framework for Relativistic Decoherence

This work addresses how classical-like behavior emerges in a relativistic quantum setting. Decoherence is described as the evolution of general quantum states belonging to a total state bundle toward a classical-like mixture of pointer states. The pointer states are geometrically supported by the relativistic quantum phase space (RQPS), defined as the subspace of the expectation-value space equipped with a ground variance field that saturates the uncertainty relations and satisfies an LCT-compatible de Sitter constraint.