Gravity and the Causal Structure of Spacetime in ODTOE — Overview

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Formalization of how gravity affects causal structure. Gravity interpreted as SYNC operation: synchronization of configurations across adjacent recursion levels of the φ-architecture. Causality introduced as reachability relation C_i ⪯_O C_j by finite actualization acts. Limiting speed c=r₀/τ₀ defines local actualization cone. Event horizon as boundary I(C)→∞. Cosmological constant problem: Planck-scale vacuum density suppression by causal-horizon factor (ℓ_Pl/R_H)² yields observed ρ_Λ without 10⁻¹²⁰ fine-tuning.