https://www.youtube.com/watch?v=6akmv1bsz1M
Fascinating video that mapped the multiverse very accurately in a physics model. My comment in response to it would be too lengthy for YouTube and could be a thesis so to keep it from being tl;dr a summary.
Why do white holes exist in relativistic models yet we cannot observe any can be easily explained by our universe being inside one. Imagine a cosmos not born from a singular explosion of energy but as the aftermath of a grand causal inversion. A universe birthed from the throat of a white hole in a mirrored "anti-verse." This hypothesis, firmly grounded in modern physics, suggests our observable reality is not the beginning but the progeny of a higher-dimensional parent universe governed by reversed physical laws. In this framework, the anti-verse operates under strict CPT symmetry, where time flows backward, antimatter dominates, and entropy decreases. Within such a realm, white holes(time-reversed counterparts to black holes) exist as stable structures, their event horizons acting as cosmic portals through which spacetime and energy/matter are eternally expelled.
This key insight reinterprets the Big Bang as a white hole eruption. Rather than a singularity emerging from nothing, our universe's rapid inflation can represent explosive ejection from an anti-verse white hole's horizon. In this model, the horizon becomes a causal boundary. Our entire cosmos exists "within" the white hole's interior, forever shielded from direct observation of the parent anti-verse. This explains our universe's apparent fine-tuning; its initial conditions inherit the thermodynamic and geometric imprint of the anti-verse's laws, filtered through the white hole's horizon.
Time's arrow in our universe arises from this asymmetry. The anti-verse's reversed temporal flow manifests as a high-entropy "past" state funneled through the white hole, resolving the paradox of the Big Bang's low-entropy origin. Quantum gravitational effects at the horizon stabilize the white hole's lifespan, allowing it to generate our universe's expanding geometry. Intriguingly, this framework aligns with black hole cosmology. If black holes in our universe spawn daughter universes in their singularities, a thermodynamic cycle emerges, linking cosmic evolution across nested spacetime geometries.
Critically, this theory avoids a true singularity by replacing classical Big Bang infinities with the white hole's horizon. Observational signatures can include subtle anisotropies in the cosmic microwave background(echoes of the anti-verse’s structure imprinted during ejection) or deviations in quantum gravity near relic white hole remnants. While novel, my hypothesis bridges relativity, quantum mechanics, and thermodynamics, offering a testable alternative to cosmic inflation and challenging our understanding of causality itself.
https://www.youtube.com/watch?v=6akmv1bsz1M