We propose a minimal discrete model in which causality, time, spacetime geometry, and quantum measurement emerge from a single primitive concept: the node (boundary). A node is defined as an irreversible completely positive (CP) map representing interaction simultaneity—the fundamental unit where states undergo non-unitary transformation. Conventional causality is reconceptualized as a chain of such nodes connected by reversible propagation. Time is not an external parameter but the cumulative count of nodes; temporal flow velocity is proportional to node density. We demonstrate that Minkowski spacetime emerges as the continuum limit of a node network, with gravitational curvature arising from spatial gradients in node density. The quantum measurement problem dissolves naturally as nodes represent the only loci of irreversibility. We derive testable predictions for gravity-induced decoherence independent of gravitational phase shifts, offering clear falsifiability. This framework unifies gravity, quantum mechanics, thermodynamics, and temporal phenomenology through a single ontological primitive: the event itself.
The notion of time is given a different footing in quantum mechanics and general relativity, treated as a parameter in the former and being an observer-dependent property in the latter. From an operational point of view time is simply the correlation between a system and a clock, where an idealized clock can be modeled as a two-level system. We investigate the dynamics of clocks interacting gravitationally by treating the gravitational interaction as a classical information channel. This model, known as the classical-channel gravity (CCG), postulates that gravity is mediated by a fundamentally classical force carrier and is therefore unable to entangle particles gravitationally. In particular, we focus on the decoherence rates and temporal resolution of arrays of
N clocks, showing how the minimum dephasing rate scales with
N, and the spatial configuration. Furthermore, we consider the gravitational redshift between a clock and a massive particle and show that a classical-channel model of gravity predicts a finite-dephasing rate from the nonlocal interaction. In our model we obtain a fundamental limitation in time accuracy that is intrinsic to each clock.