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

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dc.creatorDev, Abha
dc.creatorJain, D.
dc.creatorJhingan, S.
dc.creatorNojiri, S.
dc.creatorSami, M.
dc.creatorThongkool, I.
dc.date2008-07-22
dc.date2008-09-07
dc.date.accessioned2026-07-07T12:44:42Z
dc.date.available2026-07-07T12:44:42Z
dc.descriptionWe study the $f(R)$ theory of gravity using metric approach. In particular we investigate the recently proposed model by Hu-Sawicki, Appleby $-$ 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 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 $Λ$CDM at high redshift. However, for some parameter values there are variations in the expansion history of the universe at low redshift.
dc.description16 pages and 9 figures, typos corrected, few references and minor clarifications added, revised version to appera in PRD
dc.identifierhttps://arxiv.org/abs/0807.3445
dc.identifierhttp://arxiv.org/abs/0807.3445
dc.identifierPhys.Rev.D78:083515,2008
dc.identifierdoi:10.1103/PhysRevD.78.083515
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220863
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDelicate f(R) gravity models with disappearing cosmological constant and observational constraints on the model parameters
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