The Arrow of Records: Structured Boundary Conditions, Receptive Capacity, and Why History Accumulates Toward the Future

This paper is the ninth in a sequence developing an interpretive framework that redescribes physical reality as a causally consistent history of information updates rather than as a collection of objects independently existing within spacetime. It completes a triptych on time. The second paper (Uchida, 2026b) gave order: a relativistically invariant causal partial order that needs no clock. The eighth paper (Uchida, 2026h) gave temporal address: a clock indexes correlations but does not orient them. The present paper takes the third question, deferred by design, the arrow - why physical records are systematically formed, retained, and proliferated along one direction of the causal order only. The paper's…