2024-03-29T08:13:25Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00009496
2023-01-16T03:55:04Z
336:695:696
Delicate f(R) gravity models with a disappearing cosmological constant and observational constraints on the model parameters
Dev, Abha
Jain, Deepak
Jhingan, S.
Nojiri, S.
Sami, M.
Thongkool, I.
open access
American Physical Society, All rights reserved.
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 cosmologicalconstant 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.
American Physical Society
2008-10
eng
journal article
VoR
http://hdl.handle.net/2237/11278
https://nagoya.repo.nii.ac.jp/records/9496
https://doi.org/10.1103/PhysRevD.78.083515
1550-7998
PHYSICAL REVIEW D
78
8
083515
083515
https://nagoya.repo.nii.ac.jp/record/9496/files/PhysRevD_78_083515.pdf
application/pdf
364.8 kB
2018-02-20