RDCC v46. 0 - Relaxation-Driven Cyclic Cosmology Complete Release of the Core Framework, Numerical Fits, Euclid Interface, and 96 Companion Papers This Zenodo release presents version 46. 0 of the Relaxation-Driven Cyclic Cosmology (RDCC), a fully developed alternative to the ΛCDM model based on a relaxation-driven, CPT-symmetric, cyclic gravitational dynamics. RDCC introduces a scale-dependent relaxation rate I (a) that modifies cosmic expansion, structure formation, perturbation growth, baryonic physics, reionization, and the thermal history of the Universe. RDCC v46. 0 consists of 100 PDF documents: four core papers and ninety-six Companion Papers. Together, they form a complete, modular, and internally consistent scientific ecosystem covering background evolution, perturbation theory, non-linear structure formation, baryonic processes, reionization, observational predictions, and numerical implementation. The four core papers included in this release are: 1. RDCC Flagship Paper - The central theoretical foundation of the Relaxation-Driven Cyclic Cosmology, including the relaxation mechanism, cyclic dynamics, and global CPT structure. 2. RDCC Summary Paper - A concise overview of the RDCC framework, its motivation, key predictions, and observational implications. 3. RDCC Numerical Fits and Observational Constraints (Living Document) - A continuously updated collection of numerical fits, parameter constraints, and observational comparisons across CMB, LSS, BAO, weak lensing, cluster counts, and 21-cm data. 4. RDCC Euclid Interface Paper - A technical bridge between RDCC predictions and Euclid observables, including growth functions, non-linear corrections, weak-lensing kernels, and galaxy clustering predictions. The 96 Companion Papers provide detailed derivations, sector analyses, and modular extensions of the RDCC framework. These include: • sectoral thermodynamics, radiation physics, and early-universe dynamics • linear perturbation theory and the RDCC Boltzmann hierarchy • anisotropic stress, scale-dependent growth, and non-linear structure formation • baryonic physics, feedback processes, and gas redistribution • cosmic reionization, IGM thermal history, and 21-cm predictions • numerical implementation in CLASS and observational pipelines • conceptual, mathematical, and phenomenological extensions of RDCC Companions XIII through XXI have been fully modernized for RDCC v46. 0, ensuring consistent notation, α-parameterization, and compatibility with the updated non-linear, baryonic, and reionization sectors. ----------------------------------------------------------------------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 CPT-symmetric bounce • the resolution of the Tolman low-entropy problem • the emergence of dark matter as the gravitational shadow of the CPT-conjugate sector • the apparent weakness of gravity through sectoral energy distribution • the emergence of the invariant speed of light as an inter-sector coherence boundary • the late-time acceleration and the coincidence problem via freeze-out of the relaxation rate • the horizon and flatness problems through global CPT coherence • baryon asymmetry from asymmetric relaxation or projection effects • the strong CP problem through global CPT symmetry • global information conservation in the bipartite Hilbert space RDCC predicts correlated small deviations from ΛCDM, including: • a specific scalar spectral tilt • a dark-radiation excess • percent-level shifts in growth rates • characteristic oscillations in the stochastic gravitational-wave background • a turnover in the 21-cm power spectrum at the relaxation scale kᵣel • modified halo profiles and baryon fractions • delayed and smoother cosmic reionization 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. RDCC v46. 0 establishes the Relaxation-Driven Cyclic Cosmology as a coherent, testable, and fully documented alternative to ΛCDM, offering new insights into cosmic acceleration, structure formation, baryonic physics, reionization, and the earliest luminous epochs of the Universe. 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 (Fri,) studied this question.