Quantum gravity and the cosmological constant: lessons from two-dimensional dilaton gravity
| Autor: | Govaerts, Jan, Zonetti, Simone |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 87, 084016 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.87.084016 |
| Popis: | In the investigation and resolution of the cosmological constant problem the inclusion of the dynamics of quantum gravity can be a crucial step. In this work we suggest that the quantum constraints in a canonical theory of gravity can provide a way of addressing the issue: we consider the case of two-dimensional quantum dilaton gravity non-minimally coupled to a U(1) gauge field, in the presence of an arbitrary number of massless scalar matter fields, intended also as an effective description of highly symmetrical higher-dimensional models. We are able to quantize the system non-perturbatively and obtain an expression for the cosmological constant \Lambda in terms of the quantum physical states, in a generalization of the usual QFT approach. We discuss the role of the classical and quantum gravitational contributions to \Lambda and present a partial spectrum of values for it. Comment: 20 pages, 1 figure |
| Databáze: | arXiv |
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