Structured Relativity: Entropy–Causal-Horizon Bound Closure of Cosmic Expansion

Structured Relativity v6.1 is a bounded-response cosmological framework in which the ef-

fective expansion field is not treated as a freely adjustable background degree of freedom, but

as a causal, entropy-limited geometric response to structure. The theory begins from the Sec-

ond Law of Thermodynamics and Penrose’s gravitational entropy direction. It then locks the

admissible response space through the Planck-scale minimum causal-information cell and the

Bekenstein–Hawking maximum horizon-information bound. Only after these thermodynamic,

informational, and causal limits are established are Einstein geometry, Raychaudhuri dynamics,

and Buchert averaging introduced.

The author reports that the master equation, amplitude closure, and upper corridor value

near 73.5 km s−1 Mpc−1 were formulated and timestamped before the public April 10, 2026

H0 Distance Network announcement of H0 = 73.50 ± 0.81 km s−1 Mpc−1

. Timestamped PDF

and email receipts are held for provenance. The prediction is therefore presented as a prior

formulation, not a retrospective curve fit