The Kerr-Salpeter Cosmological Model: Geometric Dark Energy, Holographic Unification, and the Dynamical Spacetime Engine

We propose a cosmological framework in which the observable universe resides within the interior of a hyper-massive Kerr black hole existing in a higher-dimensional parent universe. In this model, the phenomenon currently attributed to dark energy is identified as the mechanical manifestation of centrifugal pressure resulting from the macroscopic frame-dragging of the parent black hole. By spatially averaging the interior Kerr metric using covariant macroscopic gravity, we derive a regularized background that mimics a Friedmann-Lemaître-Robertson-Walker spacetime while retaining an irreducible chiral signature. This geometric approach replaces the standard inflationary paradigm with a pre-bounce contracting phase, analytically deriving a primordial scalar spectral index that matches current cosmic microwave background observations as a direct consequence of the parent's rotational kinetic energy. The framework resolves the Big Bang singularity via a non-singular Einstein-Cartan bounce, providing the necessary CP-violating torsion for gravitational baryogenesis. Furthermore, we address the Hubble tension through a kinematic elongation factor derived from the topological variance of the macroscopic rotational shear, and ensure internal Cauchy stability against mass inflation via fractal boundary conditions. The model also accounts for the cosmic birefringence angle, explains large-scale multipole alignments as a frozen primordial ringdown mode, and naturally aligns the local macroscopic entropy with the covariant Bousso bound. Finally, we propose a direct experimental path to falsify this framework using spin-squeezed atom interferometry to detect the global cosmological frame-dragging.