Thongkool, I. ; Sami, M. ; Gannouji, R. ; Jhingan, S. (2009) Constraining f(R) gravity models with disappearing cosmological constant Physical Review D - Particles, Fields, Gravitation and Cosmology, 80 (4). 043523_1-043523_7. ISSN 1550-7998
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Official URL: http://prd.aps.org/abstract/PRD/v80/i4/e043523
Related URL: http://dx.doi.org/10.1103/PhysRevD.80.043523
Abstract
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
Item Type: | Article |
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Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 70498 |
Deposited On: | 21 Nov 2011 05:44 |
Last Modified: | 21 Nov 2011 05:44 |
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