The latest scientific paper proposes that the Universe did not originate from the Big Bang but rather 'bounced' out of a massive black hole within a larger 'parent' universe. Professor Enrique Gaztanaga from the University of Portsmouth’s Institute of Cosmology and Gravitation introduced this alternative theory, highlighting the challenges faced by the current Big Bang model in terms of the breakdown of physics laws. The new explanation, detailed in the journal Physical Review D, indicates that a gravitational collapse in a larger universe led to the formation of a massive black hole, triggering a rebound or 'bounce' that brought our universe into existence.

According to Prof Gaztanaga, the conventional Big Bang model commences with a point of infinite density where the laws of physics become unreliable. This theoretical issue prompted the exploration of a different approach, focusing on the internal dynamics rather than external factors. By examining what occurs when an over-density of matter collapses under gravity, the research team developed a theory grounded in quantum mechanics principles, offering a testable model.

The study reveals that gravitational collapse does not inevitably result in a singularity, demonstrating that a collapsing mass cloud can reach a high-density state and rebound outward, resembling our universe. The rebound phase, driven by the physics of the bounce itself rather than a hypothetical field, naturally leads to accelerated expansion. The model predicts a slightly curved universe akin to Earth's surface and could potentially address various enigmas concerning supermassive black holes, dark matter, and galaxy formation.

Prof Gaztanaga, also involved in the ARRAKIHS ESA space mission, proposed that the mission's telescopes could validate the theory by detecting ultra-low surface brightness structures in galaxy outskirts. These observations are crucial for understanding the growth and evolution of galaxies.