How round is the quantum de Sitter universe?
| العنوان: | How round is the quantum de Sitter universe? |
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| المؤلفون: | N.F. Klitgaard, Renate Loll |
| المصدر: | European Physical Journal C, 80, 10, pp. 1-12 European Physical Journal C: Particles and Fields, Vol 80, Iss 10, Pp 1-12 (2020) European Physical Journal European Physical Journal C, 80, 1-12 |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | High Energy Physics - Theory, Physics, Quantum geometry, Physics and Astronomy (miscellaneous), De Sitter space, Quantum dynamics, FOS: Physical sciences, lcsh:Astrophysics, General Relativity and Quantum Cosmology (gr-qc), General Relativity and Quantum Cosmology, Theoretical physics, High Energy Physics - Theory (hep-th), De Sitter universe, Minisuperspace, Theoretical High Energy Physics, lcsh:QB460-466, Quantum gravity, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, High Energy Physics, Engineering (miscellaneous), Curved space, Scale factor (cosmology) |
| الوصف: | We investigate the quantum Ricci curvature, which was introduced in earlier work, in full, four-dimensional quantum gravity, formulated nonperturbatively in terms of Causal Dynamical Triangulations (CDT). A key finding of the CDT approach is the emergence of a universe of de Sitter-type, as evidenced by the successful matching of Monte Carlo measurements of the quantum dynamics of the global scale factor with a semiclassical minisuperspace model. An important question is whether the quantum universe exhibits semiclassicality also with regard to its more local geometric properties. Using the new quantum curvature observable, we examine whether the (quasi-)local properties of the quantum geometry resemble those of a constantly curved space. We find evidence that on sufficiently large scales the curvature behaviour is compatible with that of a four-sphere, thus strengthening the interpretation of the dynamically generated quantum universe in terms of a de Sitter space. Comment: 24 pages, 8 figures |
| وصف الملف: | application/pdf |
| تدمد: | 1434-6044 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::938ef14d061decbd16042bd2fd4a9f40 https://hdl.handle.net/2066/226854 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....938ef14d061decbd16042bd2fd4a9f40 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14346044 |
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