Constraining Dvali-Gabadadze-Porrati gravity from observational data
- Scuola Internazionale Superiore di Studi Avanzati, Via Beirut 2-4, I-34014 Trieste (Italy)
The accelerating expansion of our Universe at present could be driven by an unknown energy component (dark energy) or a modification of general relativity (modified gravity). In this paper we revisit the constraints on a phenomenological model which interpolates between the pure {lambda}CDM model and the Dvali-Gabadadze-Porrati braneworld model with an additional parameter {alpha}. Combining the cosmic microwave background , baryon acoustic oscillations, and type Ia supernovae, as well as some high-redshift observations, such as the gamma-ray bursts and the measurements of linear growth factors, we obtain the tight constraint on the parameter {alpha}=0.254{+-}0.153 (68% C.L.), which implies that the flat Dvali-Gabadadze-Porrati model is incompatible with the current observations, while the pure {lambda}CDM model still fits the data very well. Finally, we simulate the future measurements with higher precisions and find that the constraint on {alpha} can be improved by a factor of 2 when compared to the present constraints.
- OSTI ID:
- 21296331
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 10; Other Information: DOI: 10.1103/PhysRevD.79.103527; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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