The Self-Organized de Sitter Universe

Details The Self-Organized de Sitter Universe The Self-Organized de Sitter Universe

2008-06-02

arxiv.org/abs/0806.0397v2

Int.J.Mod.Phys.D17:2515-2520,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Article unchanged, one line added to acknowledgment

Scientific paper

10.1142/S0218271808014011

We propose a theory of quantum gravity which formulates the quantum theory as a nonperturbative path integral, where each spacetime history appears with a weight given by the exponentiated Einstein-Hilbert action of the corresponding causal geometry. The path integral is diffeomorphism-invariant (only geometries appear) and background-independent. The theory can be investigated by computer simulations, which show that a de Sitter universe emerges on large scales. This emergence is of an entropic, self-organizing nature, with the weight of the Einstein-Hilbert action playing a minor role. Also the quantum fluctuations around this de Sitter universe can be studied quantitatively and remain small until one gets close to the Planck scale. The structures found to describe Planck-scale gravity are reminiscent of certain aspects of condensed-matter systems.

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