Relaxation-Driven Cyclic Cosmology (RDCC) v1.27 Gravitational Wave Spectrum from the CPT-Fixpoint Bounce and Observational Outlook

Relaxation-Driven Cyclic Cosmology (RDCC) v1.27 Gravitational Wave Spectrum from the CPT-Fixpoint Bounce and Observational Outlook Relaxation-Driven Cyclic Cosmology (RDCC) v1.27 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 derives the stochastic gravitational wave background generated at the CPT-fixpoint bounce, illustrating a characteristic peaked spectrum Ω_gw(f) in the mHz range testable with LISA and PTA. Compatibility with current observational constraints (DESI 2025, Planck) is shown illustratively, while maintaining the framework's structural and interpretative nature. The dualistic principle is emphasized, offering space for extensions in quantum entanglement and black hole interiors. No phenomenological fitting or competition with ΛCDM is claimed. 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 (v1.26): https://zenodo.org/records/18181373 Lehmann, Michael (Independent Researcher) E-Mail: [email protected]