ACORN: SpaceTime⁺: A Unified Geometry Series — Overview and Index

This document provides the official overview and index of the SpaceTime⁺ Unified Geometry Series. The series develops a complete geometric foundation for physics using five-dimensional curvature and introduces the ACORN Master Operator (Axial Curvature Operator acting on the Radial Normal), a single geometric mechanism from which all known four-dimensional physical laws emerge. Through hypersurface projection, the ACORN operator reproduces gravitation, electromagnetism, inertia, radiation reaction, charge invariance, quantisation, and cosmology without additional postulates. Each volume in the SpaceTime⁺ Series presents a self-contained development of this unified geometric framework. This Overview serves as the parent reference for Volumes 1–4 and forms the basis for future work in the SpaceTime⁺ programme.