Coordinate Separation
Two states may carry different temporal labels without a physically available path between them.
Temporal State Topology asks whether coordinate separation fully describes which physical states can become causally accessible—or whether deeper connectivity matters.

The familiar time-highway metaphor assumes a traveler moves along a preexisting temporal road. TST instead asks whether engineering could alter which states count as adjacent under the complete physical architecture.
Two states may carry different temporal labels without a physically available path between them.
A path exists only when geometry, topology, causal order, boundary conditions, and physical resources permit influence or transit.
Past access must be distinguished from reconstruction, simulation, replay, branch counterpart, or postselected inference.
Define states, adjacency, path classes, metrics, topology, and allowed transformations.
Recover relativity, proper time, ordinary causality, quantum probability, and no-signaling in validated regimes.
Predict a measurable result not already produced by general relativity, quantum theory, topology, or ordinary information channels.
Specify a sensitivity range in which a null result rules out the proposed coupling or realization.