Reduction, Proliferation, or Constraint? On competing foundational commitments in cosmology

Description –This paper examines three distinct strategies by which contemporary cosmology accounts for large-scale regularity: dynamical proliferation, ontological reduction, and global constraint. Rather than comparing specific models on the basis of empirical fit, the analysis focuses on the foundational commitments each strategy entails and the explanatory costs those commitments incur. Proliferation secures regularity by retaining a permissive dynamical framework and supplementing it with additional components, parameters, or initial conditions as required. Reduction dissolves the problem by denying an ontological role to time and dynamics, reinterpreting apparent evolution as static correlation within a space of possibilities. Constraint retains time and dynamical evolution, but enforces regularity by restricting the class of admissible cosmological solutions through a fixed global condition. The paper argues that these strategies differ less in empirical ambition than in how they allocate explanatory burden. Proliferation trades necessity for adaptability, distributing cost across an expanding ontology. Reduction trades causal explanation for conceptual economy, insulating itself from empirical risk. Constraint concentrates explanatory cost in a single explicit restriction, accepting vulnerability to decisive failure as the price of explanatory discipline. By placing these strategies on common scales, the paper seeks to recover a standard for cosmological explanation that has become obscured by empirical success alone. It does not endorse a particular framework, but clarifies what is gained, and what is relinquished, when cosmology chooses to elaborate, eliminate, or constrain in order to account for the order it observes. The entire compendium of TSPC research papers is now to be found at https://spacetimeparity.eu/ Revisions and amendments v.2. Minor typographical corrections. v.3 Identifier added.