Speaker: Enrique Gaztanaga (ICE/CSIC, IEEC)
Title: The Black Hole Universe
Abstract: 
Black Hole (BH) and Big Bang (BB) solutions to General Relativity (GR) are singular and should be used with caution to model the real universe. We present a new classical solution to GR, which we call BHU, that avoids these singularities and can be used both as BH or BB. Our universe is accelerating because it is inside a trapped Λ surface. What is outside? Energy conditions prevent regular matter/radiation to be compressed inside a BH event horizon𝑟 𝑆𝑊=2𝐺𝑀, where 𝑀 is the external BH mass.Yet, BH of different 𝑀 have been detected. What is inside? This is key to the BH formation and its possible role in galaxy evolution or as dark matter. Our BHU solution correspond to a false vacuum energy density excess Δ =𝜌Λ=−𝑝Λ=𝜌𝐵𝐻, which also has regular matter/radiation expanding inside. For the inside comoving observer the BHU is an homogeneous and isotropic expanding (FLRW) metric. For the outside observer, the same FLRW metric looks like a static BH with mass𝑀∝Δ−1/2. This frame duality allow us to connect two nested FLRW metrics as new solution to GR. In the comoving frame, matter accreted to the BHU is diluted away. In the outside SW frame this corresponds to BH mass loss, resulting in Gravitational Waves. We discuss BHUs distinct observational features, which already indicate a breakdown of the standard BB picture in favor of the BHU. Our universe is a non singular BHU. May be one of many, older and younger, interconnected island Universes.