The Reductive Zero Hypothesis: A Phenomenological Framework for Cosmic Succession

This preprint presents the Reductive Zero Hypothesis (RZH), a phenomenological cosmological framework proposing that cosmic evolution can be interpreted as a succession of reductive transitions toward lower effective energy-density states. The work explores the conceptual implications of this hypothesis for cosmological expansion, large-scale structure formation, and the long-term evolution of the Universe. The paper is intended as an exploratory theoretical investigation and does not claim to replace the standard cosmological model. Instead, it provides a falsifiable conceptual framework that may serve as a basis for future observational and theoretical studies.