The Apparent Universe

Abstract

We exploit the parallel between dynamical black holes and cosmological spacetimes to describe the evolution of Friedmann-Lemaître-Robertson-Walker universes from the point of view of an observer in terms of the dynamics of the apparent horizon. Using the Hayward-Kodama formalism of dynamical black holes, we clarify the role of the Clausius relation to derive the Friedmann equations for a universe, in the spirit of Jacobson's work on the thermodynamics of spacetime. We also show how dynamics at the horizon naturally leads to the quantum-mechanical process of Hawking radiation. We comment on the connection of this work with recent ideas to consider our observable Universe as a Bose-Einstein condensate and on the corresponding role of vacuum energy.

16 pages, 1 figure

References in corpus (5)

• Unified First Law and Thermodynamics of Apparent Horizon in FRW Universe
• Hawking Radiation of Apparent Horizon in a FRW Universe
• Quantum Compositeness of Gravity: Black Holes, AdS and Inflation
• Information Preservation and Weather Forecasting for Black Holes
• Vacuum energy, holography and a quantum portrait of the visible Universe

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