The Spinning Universe Within a Rotating Black Hole: A Unified Hypothesis of Dark Matter and Dark Energy

“Space — the final frontier”. But what if this well-known phrase is not quite true? What if space is not the final boundary, but instead a portal — an event horizon — hiding a deeper, higher-dimensional cosmos beyond?We explore a speculative cosmological model in which our universe is the interior of a rotating (Kerr) black hole residing in a higher-dimensional “parent” cosmos. In this scenario, the Big Bang is interpreted as a white hole eruption triggered by the formation of a massive black hole in an external space. The inherent angular momentum of this parent black hole is hypothesized to impart a global rotation to our universe, potentially explaining recent observations of a preferred spin direction in distant galaxies. Within this framework, dark matter and dark energy emerge not as mysterious substances but as natural consequences of spacetime geometry: the excess gravitational effects attributed to dark matter are modeled as inertial frame-dragging in the interior Kerr spacetime, while dark energy corresponds to the expansion driven by the black hole’s ongoing mass accretion. We review theoretical underpinnings for a universe-as-black-hole (or “black hole cosmology”) from Schwarzschild to Kerr solutions, and discuss how frame-dragging (Lense–Thirring) effects could mimic dark matter’s influence on galactic rotation curves. We also connect black hole mass growth to an accelerating internal expansion analogous to dark energy. The paper compiles relevant literature, from early proposals by Pathria and Good in the 1970s to recent observational hints of cosmic rotation. While largely speculative, this unified model provides an intriguing narrative tying together black holes, cosmic rotation, dark matter, and dark energy, motivating discussion of its testable implications and outstanding challenges.