The Opening of Time as a Registration Threshold: Light, Structure, and the Emergence of Temporal Order

Cosmological origin models typically assume that energy, radiation, and temporal order emerge simultaneously at an initial event. In this work, we show that this assumption is structurally unnecessary and physically misleading. Building on prior results that remove heat from a causal role and reinterpret light as a resolution-limited probe rather than a dynamical driver, we demonstrate that time may exist without yet being registrable. The early universe is shown to occupy a non-registrable regime in which admissible futures are available but cannot be resolved into an observable sequence. We identify the transition commonly known as recombination as a registration threshold: the point at which electromagnetic interaction first becomes capable of resolving temporal order due to sufficient structural differentiation. Under this interpretation, the Cosmic Microwave Background marks the earliest registrable temporal surface rather than a visible beginning, and the Big Bang is re-specified as the opening of time itself—a boundary condition enabling observable temporal order rather than an event occurring within time. This reframing preserves all established cosmological observations while clarifying the causal hierarchy underlying time, observation, and structure.