Nonperturbative quantum de Sitter universe
By J. Ambjørn, A. Goerlich, J. Jurkiewicz, R. Loll. 2008
162 citations recorded by the source corpus.
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.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/ad91dd5508f0c0ac1d05cda9857fd29c6a175feb
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Citations in the corpus
- Nonperturbative quantum gravity (2012, background): “26 and can be succinctly summarized by the formula [83, 84]”
- Cosmology of the Lifshitz universe (2009, background): “ z = 3 critical theory on one hand and CDT and QEG on the other. In CDT, at large-enough scales the Euclidean universe can be described by a de Sitter geometry perturbed by semi-classical fluctuations [41, 42, 43]. The characteristic size of the universe is roughly between ℓPl and O(10)ℓPl, indicatin”
- Quantum gravity from causal dynamical triangulations: a review (2019, background): “The next important finding came in 2007, when it was shown that the expectation value of the global shape of the dynamically generated universe behaves like the shape of a classical de Sitter universe [13, 14].”