Structured Possibility and Local Actuality: A Self–Fibre Framework for Laws, Probability, and Temporal Asymmetry

This paper develops a new metaphysical framework for fine–tuning, physical probability, and temporal asymmetry. I argue that these phenomena arise not from fundamental physical laws or cosmological mechanisms, but from the global structure of a modal space of possible spacetimes. The Self–Fibre Framework posits that actuality is local—each observer occupies one spacetime—and that possibility is globally structured. Physical constants, probabilistic patterns, and temporal orientations are thus fibre–internal features constrained by modal organisation. This unified metaphysical picture offers explanatory advantages over Lewisian modality, Humean mosaicism, Everettian quantum mechanics, and multiverse cosmology. An appendix sketches a mathematical model, though the argument remains entirely philosophical.