Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-07-28
Phys.Rev.D78:063544,2008
Physics
High Energy Physics
High Energy Physics - Theory
Article unchanged. Line added in acknowledgment
Scientific paper
10.1103/PhysRevD.78.063544
The dynamical generation of a four-dimensional classical universe from nothing but fundamental quantum excitations at the Planck scale is a long-standing challenge to theoretical physicists. A candidate theory of quantum gravity which achieves this goal without invoking exotic ingredients or excessive fine-tuning is based on the nonperturbative and background-independent technique of Causal Dynamical Triangulations. We demonstrate in detail how in this approach a macroscopic de Sitter universe, accompanied by small quantum fluctuations, emerges from the full gravitational path integral, and how the effective action determining its dynamics can be reconstructed uniquely from Monte Carlo data. We also provide evidence that it may be possible to penetrate to the sub-Planckian regime, where the Planck length is large compared to the lattice spacing of the underlying regularization of geometry.
Ambjorn Jan
Goerlich Andrzej
Jurkiewicz Jerzy
Loll Renate
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