Effective Tension of a Causal Null-Network

We propose an informational geometrodynamics framework in which macroscopic spacetime emerges from a purely causal network of directionally correlated null-geodesics. We structure physical reality into three ontological layers governed by directional thermodynamic flow. The primary flow of information is directed toward the infrared (IR) sink (Layer III, e. g. , black holes), strictly following the law of entropy increase. The macroscopic spatial metric (Layer II) is dynamically woven as the secondary "thermodynamic exhaust" of this continuous process, generated from the atomic to the quantum scale via causal extrusion from a pre-geometric vacuum (Layer I). To formalize this, we construct a covariant effective field theory. Deviating from the standard photon-gas interpretation, we model active radiation as one-dimensional topological null-links causally extruded from baryonic sources. We demonstrate that the macroscopic equation of state w = -1/3 emerges rigorously from the spatial averaging of these active anisotropic tensions against the decoupled, isotropic relic background. This ubiquitous tension dictates a strictly linear basal expansion, R (t) = ct. Crucially, we retain a highly dynamical Universe: leveraging covariant conservation laws, we prove that the apparent late-time Hubble acceleration is a purely geometric optical effect, driven by the thermodynamic relaxation of global spatial curvature k (t) as sources collapse into Layer III. On galactic scales, the network is generated by active baryonic nodes. By applying strict wave coherence to this locally extruded network (E₍₄ₓ N²) and equating it to the source's mass-energy equivalence, we derive the holographic scaling N M. Bounded by the Unruh-Hawking temperature of the cosmic horizon (a₀ = c H₀ / 2), this coherent boundary layer naturally reproduces deep-MOND phenomenology without collisionless dark matter.