2011/02/18 by J. Ambjørn, J. Ambjorn, A. Gorlich +6 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #gr-qc #hep-lat #hep-th
paper · pdf · doi:10.1016/j.nuclphysb.2011.03.019
published as Nucl.Phys.B849:144-165,2011 · 30 pages, 10 figures
arxiv created 2011/02/18 · openalex publication_date 2011/05/02 · arxiv updated 2011/05/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
Previous work has shown that the macroscopic structure of the theory of quantum gravity defined by causal dynamical triangulations (CDT) is compatible with that of a de Sitter universe. After emphasizing the strictly nonperturbative nature of this semiclassical limit we present a detailed study of the three-volume data, which allows us to re-confirm the de Sitter structure, exhibit short-distance discretization effects, and make a first detailed investigation of the presence of higher-order curvature terms in the effective action for the scale factor. Technically, we make use of a novel way of fixing the total four-volume in the simulations.