Constraint propagation equations of the 3+1 decomposition of ƒ(R) gravity
Theories of gravity other than general relativity (GR) can explain the observed cosmic acceleration without a cosmological constant. One such class of theories of gravity is f(R). Metric f(R) theories have been proven to be equivalent to Brans-Dicke (BD) scalar-tensor gravity without a kinetic term...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
17 March 2011
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| In: |
Classical and quantum gravity
Year: 2011, Jahrgang: 28, Heft: 8, Pages: 1-19 |
| ISSN: | 1361-6382 |
| DOI: | 10.1088/0264-9381/28/8/085006 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/0264-9381/28/8/085006
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| Verfasserangaben: | Vasileios Paschalidis, Seyyed M.H. Halataei, Stuart L. Shapiro and Ignacy Sawicki |
| Zusammenfassung: | Theories of gravity other than general relativity (GR) can explain the observed cosmic acceleration without a cosmological constant. One such class of theories of gravity is f(R). Metric f(R) theories have been proven to be equivalent to Brans-Dicke (BD) scalar-tensor gravity without a kinetic term (ω = 0). Using this equivalence and a 3+1 decomposition of the theory, it has been shown that metric f(R) gravity admits a well-posed initial value problem. However, it has not been proven that the 3+1 evolution equations of metric f(R) gravity preserve the (Hamiltonian and momentum) constraints. In this paper, we show that this is indeed the case. In addition, we show that the mathematical form of the constraint propagation equations in BD-equilavent f(R) gravity and in f(R) gravity in both the Jordan and Einstein frames is exactly the same as in the standard ADM 3+1 decomposition of GR. Finally, we point out that current numerical relativity codes can incorporate the 3+1 evolution equations of metric f(R) gravity by modifying the stress-energy tensor and adding an additional scalar field evolution equation. We hope that this work will serve as a starting point for relativists to develop fully dynamical codes for valid f(R) models. |
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| Beschreibung: | Im Titel ist "function" als mathematisches Zeichen dargestellt Gesehen am 22.09.2022 |
| Beschreibung: | Online Resource |
| ISSN: | 1361-6382 |
| DOI: | 10.1088/0264-9381/28/8/085006 |