Delicate f(R) gravity models with a disappearing cosmological constant and observational constraints on the model parameters
- Miranda House, University of Delhi, Delhi 110 007 (India)
- Deen Dayal Upadhyaya College, University of Delhi, New Delhi 110 015 (India)
- Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi (India)
- Department of Physics, Nagoya University, Nagoya 464-8602 (Japan)
We study the f(R) theory of gravity using the metric approach. In particular we investigate the recently proposed model by Hu and Sawicki; Appleby and Battye; and Starobinsky. In this model, the cosmological constant is zero in flat space time. The model passes both the solar system and the laboratory tests. But the model parameters need to be fine-tuned to avoid the finite time singularity recently pointed to in the literature. We check the concordance of this model with the H(z) and baryon acoustic oscillation data. We find that the model resembles the {lambda}CDM at high redshift. However, for some parameter values there are variations in the expansion history of the universe at low redshift.
- OSTI ID:
- 21254399
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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