Constraining f(R) gravity models with disappearing cosmological constant

Journal Article · Sat Aug 15 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.043523· OSTI ID:21322451

Thongkool, I; Sami, M; Jhingan, S ^[1]; Gannouji, R ^[2]

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1. Centre of Theoretical Physics, Jamia Millia Islamia, New Delhi 110025 (India)
2. IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007 (India)

The f(R) gravity models proposed by Hu-Sawicki and Starobinsky are generic for local gravity constraints to be evaded. The large deviations from these models result in either violation of local gravity constraints or the modifications indistinguishable from cosmological constant. The curvature singularity in these models is generic but can be avoided, provided that proper fine-tuning is imposed on the evolution of scalaron in the high curvature regime. In principle, the problem can be circumvented by incorporating quadratic curvature correction in the Lagrangian, though it might be quite challenging to probe the relevant region numerically.

• OSTI ID: 21322451
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 4; Other Information: DOI: 10.1103/PhysRevD.80.043523; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CORRECTIONS
COSMOLOGICAL CONSTANT
EVOLUTION
GRAVITATION
LAGRANGIAN FUNCTION
SIMULATION
SINGULARITY