Delicate f(R) gravity models with a disappearing cosmological constant and observational constraints on the model parameters

Abha Dev, Deepak Jain, S. Jhingan, S. Nojiri, M. Sami, and I. Thongkool
Phys. Rev. D 78, 083515 – Published 10 October 2008

Abstract

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 ΛCDM at high redshift. However, for some parameter values there are variations in the expansion history of the universe at low redshift.

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  • Received 29 July 2008

DOI:https://doi.org/10.1103/PhysRevD.78.083515

©2008 American Physical Society

Authors & Affiliations

Abha Dev1, Deepak Jain2, S. Jhingan3, S. Nojiri4, M. Sami3, and I. Thongkool3

  • 1Miranda House, University of Delhi, Delhi 110 007, India
  • 2Deen Dayal Upadhyaya College, University of Delhi, New Delhi 110 015, India
  • 3Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi, India
  • 4Department of Physics, Nagoya University, Nagoya 464-8602, Japan

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Issue

Vol. 78, Iss. 8 — 15 October 2008

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