The apparent Universe

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 h...

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Bibliographic Details
Published in:Classical and quantum gravity 2015-10, Vol.32 (20), p.205006-205017
Main Authors: Binétruy, P, Helou, A
Format: Article
Language:English
Subjects:
Astrophysics
black hole
Black holes (astronomy)
Bose-Einstein condensates
Dynamics
expansion
Formalism
Horizon
Mathematical analysis
Physics
Quantum gravity
Universe
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Summary: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.
ISSN:0264-9381
1361-6382
DOI:10.1088/0264-9381/32/20/205006