The Black Hole Universe (BHU)
Résumé
Observations tell us that cosmic expansion is dominated by an effective cosmological constant. This means that we live inside a trapped surface, which corresponds to a Black Hole (BH) event horizon. We show that such Black Hole Universe (BHU) is a solution to classical GR, where two nested FLRW metrics are connected by a BH event horizon. Observed CMB anomalies are consistent with such BHU. Our Universe is the first BH for which we know what is inside.
The same BHU solution can also be used to model stellar or galactic BH which are not singular and have regular matter and radiation expanding inside their event horizon. Observed BHs (and possibly BHs making the Dark Matter, DM) could just be BHUs. In comoving coordinates the BHU is expanding while in Schwarzschild coordinates it is asymptotically static. Such frame duality can be directly tested with current cosmological and BH observations.
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