Are We Really in a Black Hole?

The hypothesis that our observable Universe resides within the interior of a black 
hole posits intriguing mathematical analogies between the Schwarzschild 
geometry and Friedmann-Lemaître-Robertson-Walker (FLRW) metrics. This 
paper provides a rigorous evaluation using general relativity, holographic duality, 
loop quantum gravity, and empirical data from Planck, JWST, DESI, 
LIGO/Virgo, and Event Horizon Telescope observations. We derive exact 
coordinate transformations, compute Bayesian evidence ratios (ln B ≈ 28 
favoring ΛCDM), and quantify inconsistencies in cosmic expansion, CMB 
isotropy, and gravitational wave populations. While entropy scalings and horizon 
bounds offer supportive correspondences, the model fails key falsifiability tests, 
including absence of radial infall signatures and torsion effects. We conclude that 
black hole cosmology remains a heuristic analogy without empirical support, with 
probability P(BH|data) ≲ 10⁻¹⁰. Novel tests via pulsar timing arrays and 21 cm 
cosmology are proposed.