Relaxation-Driven Cyclic Cosmology (RDCC) v1.26

Sectoral Perturbations and Gravitational Wave Signatures in Relaxation-Driven Cyclic Cosmology (RDCC) v1.26 Relaxation-Driven Cyclic Cosmology (RDCC) v1.26 extends the minimalist eternal framework based on standard Einstein gravity and a single effective complex scalar field Φ in a softly tilted double-well potential. This version focuses on sectoral linear perturbation theory using the Mukhanov–Sasaki formalism and derives illustrative gravitational wave signatures from the CPT-fixpoint bounce. It discusses observational windows for testing (e.g., LISA, PTA) while emphasizing the dualistic principle as a unifying vision for cosmic structure. RDCC clarifies structural conditions for time, entropy, and dark phenomena without inflation or additional fields. All results are presented illustratively, maintaining the framework's interpretative nature. Compatible with current DESI and Planck data uncertainties. The framework remains strictly minimalist and structurally motivated, distinguishing illustrative reconstructions from fundamental observables. For a broader meta-theoretical perspective on structural limits, see the companion work Perspective–Dual Cosmology (PDK): https://zenodo.org/records/18159786 Previous version (v1.25): https://zenodo.org/records/18169825 Relaxation-Driven Cyclic Cosmology (RDCC) -> Core Framework v1.1 RDCC - A Structural Manifest