RDCC v45.0 is an extended release of the Relaxation Driven Cyclic Cosmology research program. This version adds one new Companion, bringing the total number of documents to 100 individual PDFs. The new addition, Companion CI, develops the RDCC interpretation of black holes and white holes as CPT-conjugate inter-sector horizons and extends the framework into the strong-gravity regime. All other documents from v44.0 remain unchanged. The RDCC ecosystem now consists of the Flagship Paper, the Summary Paper, 96 Companions, the Numerical Fits and Observational Constraints Paper, and the Speculative Extensions and Conceptual Companions II Paper. The Companion Series spans the full theoretical, geometric, numerical, and conceptual structure of RDCC and is organized into functional blocks: Block A: Foundations and Core Dynamics Companions I to X develop the mathematical structure of relaxation-driven cosmology, the cyclic mechanism, the relaxation kernel, and the global dynamical picture. Block B: Geometry, Phase Space, and Stability Companions XI to XX analyze the geometric formulation, the phase-space structure, the bounce stability, and the behavior of the relaxation parameter. These papers form the bridge between the theoretical core and the inference framework. Block C: Inference, Observables, and Probes Companions XXI to XL introduce the inference architecture, the construction of observables, the role of geometric, morphological, and topological probes, and the scale-dependent signatures of the relaxation dynamics. Block D: Numerical Structures and Data Pipelines Companions XLI to LX cover numerical methods, simulation strategies, response functions, Fisher information, and the construction of compressed statistics. These papers define the operational tools used in the Numerical Fits Paper. Block E: Topology, Morphology, and Nonlinear Structure Companions LXI to LXXX explore persistent homology, Betti curves, Minkowski functionals, peak and void statistics, and transport-based topology. These probes capture the nonlinear relaxation signatures that distinguish RDCC from standard cosmology. Block F: Degeneracies, Null Directions, and Optimal Probes Companions LXXXI to XCIX analyze degeneracy structure, null directions in observable space, cross-probe alignment, and the identification of optimal probes. Three merged Companions unify earlier multi-part documents and provide a streamlined presentation. Companion CI extends the RDCC framework into the domain of black-hole physics. It shows that a black hole in the visible (+) sector and its CPT-conjugate white hole in the (-) sector form a single global configuration whose apparent separation arises only from sectoral projection. The horizon acts as an inter-sector information interface, providing a globally unitary resolution of the black-hole information paradox and linking strong-gravity phenomena to the same CPT-symmetric and relaxation-driven mechanisms that govern the cosmological bounce and the thermodynamic arrow of time. Version v45.0 integrates this new Companion while preserving the stable ecosystem layout introduced in v44.0. With 100 documents, this release represents the complete and up-to-date state of the RDCC program. All documents are provided as individual PDFs to ensure clarity, accessibility, and long-term archival stability.--------------Key theoretical outcomes of RDCC RDCC addresses several long-standing cosmological puzzles within a single structural framework based on global CPT symmetry and a bipartite quantum state. The approach provides natural mechanisms for the thermodynamic arrow of time, the replacement of the cosmological singularity by a nonsingular bounce, and the resolution of the Tolman low-entropy problem. Dark matter arises as the gravitational shadow of the CPT-conjugate sector, and the apparent weakness of gravity follows from the sectoral distribution of energy densities. The framework predicts correlated small deviations from the standard cosmological model, including a specific scalar spectral tilt, a dark-radiation excess, a percent-level shift in growth rates, and characteristic oscillations in the stochastic gravitational-wave background. The invariant speed of light emerges as a coherence boundary between the sectors. The late-time acceleration and the coincidence problem follow from the freeze-out behavior of the relaxation parameter. Horizon and flatness problems are resolved through global coherence across the CPT boundary, and baryon asymmetry can arise from asymmetric relaxation or projection effects. The strong CP problem is avoided by global CPT symmetry, and information is conserved globally in the bipartite Hilbert space, offering a natural perspective on the black-hole information paradox.A further structural outcome arises from the RDCC interpretation of black holes and white holes. In a bipartite, CPT-symmetric Hilbert space a black hole in the visible (+) sector and its CPT-conjugate white hole in the (-) sector form a single global configuration rather than two independent objects. The horizon acts as an inter-sector information interface: what appears as irreversible infall in the (+) sector corresponds to time-reversed outflow in the (-) sector. This structure provides a globally unitary resolution of the black-hole information paradox and links strong-gravity phenomena to the same CPT-symmetric and relaxation-driven mechanisms that govern the cosmological bounce and the thermodynamic arrow of time. Related documents and the development history of the RDCC framework are available on Zenodo:https://zenodo.org/records/18204087 Michael Lehmannmi.lehmann@gmx.de
Michael Lehmann (Wed,) studied this question.