An Effective Friedmann Equation from Relational Spacetime Dilution

We propose an effective cosmological framework in which spacetime is not fundamentalbut emerges as a collective state of matter–geometry correlations. Cosmic acceleration isnot attributed to a fundamental dark energy component, but to a progressive dilution ofrelational geometric coherence as the matter density decreases. This approach leads to amodified effective Friedmann equation that reproduces standard cosmology at high densitywhile introducing testable deviations at late times. The framework is motivated by andcompatible with approaches such as loop quantum gravity and group field theory cosmology,preserves the primordial perturbation spectrum constrained by Planck, and providesa geometrically motivated explanation for late-time acceleration without introducing exoticdegrees of freedom.