I propose a cosmological model in which our observable universe is the expanding remnant of a quantumbounce occurring at the end of Hawking evaporation of a black hole in a parent universe. Singularityis avoided by loop quantum gravity (LQG) effects that replace the classical singularity with a bounce atPlanck density. The bounce expels trapped matter and radiation as a relativistic plasma burst into theparent spacetime, producing the hot Big Bang phase. The cosmic microwave background (CMB) is therecombination surface of this plasma ≈380,000 years after the bounce. Expansion is driven by initial rela-tivistic momentum and thermodynamic entropy, requiring no dark energy. Gravitational time dilation nearthe bounce provides sufficient internal time for structure formation. Black holes forming in our universe laterevaporate and bounce, producing finite sibling universes scattered in the same parent region. The modeleliminates the flatness, horizon, and inflation fine-tuning problems, removes the need for dark energy (95%of the energy budget in ΛCDM), and resolves the Hubble tension without new physics.
Michael Skjothaug (Tue,) studied this question.