Rotational Dynamics and Phase Reversal within the HRDCC Framework

The Holographic Rotation-Driven Cyclic Cosmology (HRDCC) framework interprets cosmological evolution as the cumulative consequence of effective physical processes inherited across successive cosmological cycles. Earlier papers of the HRDCC publication program established the effective cosmological framework, developed phenomenological interpretations of its principal physical sectors, and examined their potential observational signatures. However, one essential phenomenological component has remained only qualitatively described: the effective dynamical connection between the rotational properties of the parent black hole and the large-scale evolution of the embedded cosmological spacetime. The present work develops this missing macroscopic dynamical layer. Within the phenomenological HRDCC framework, the conserved parent-black-hole parameters are assigned distinct physical roles, with particular emphasis on the rotational degree of freedom as the macroscopic energy reservoir governing long-term cosmological evolution. An effective sequence is proposed in which the inherited rotational energy is represented through an effective rotational coupling, contributes to the effective cosmological background, and gradually modifies the conditions supporting cosmic expansion. As the available rotational support evolves, the framework naturally admits a transition from expansion to contraction through an effective phase-reversal criterion, providing a phenomenological interpretation of the transition toward the Crounches phase without invoking additional microscopic assumptions. The resulting description closes an important conceptual gap within the HRDCC publication program by connecting previously introduced effective cosmological components into a coherent macroscopic dynamical framework. The analysis remains intentionally phenomenological: no microscopic quantum-gravitational derivation is assumed, and the proposed relations are interpreted as effective descriptions whose detailed physical origin is deferred to future microscopic investigations. Within these limitations, the framework offers a consistent rotation-driven phenomenological interpretation of cosmological phase evolution while preserving compatibility with the broader effective architecture developed throughout the HRDCC publication program. This manuscript constitutes the first paper of the HRDCC publication program. It is distributed as a preprint and has not undergone formal peer review.