RCD Hilltop Dark Energy Series — Overview

This document provides a concise guide to a five-paper series analyzing the cosmolog- ical viability of a scalar field dark energy model within Radial Coherential Dynamics (RCD). The series follows a single question from formulation to perturbative analysis: can the RCD hilltop at C = 1/2 function as a viable dark energy mechanism? The answer is conditionally affirmative. The hilltop is linearly unstable in its bare form (Paper I), cannot be stabilized by kinetic modifications (Paper II), but can be dy- namically stabilized by coupling to a dissipative bath sector (Paper III). This stabiliza- tion is UV-consistent within a Caldeira–Leggett framework (Paper IV) and produces a perturbation spectrum free of pathologies, with observational signatures marginally distinguishable from ΛCDM (Paper V).