Abstract
In the present paper we consider f (R) gravity theories in the metric approach and we derive the equations of motion, focusing also on the boundary conditions. In such a way we apply the general equations to a first order perturbation expansion of the Lagrangian. We present a model able to fit supernovae data without introducing dark energy.
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Acknowledgments
The authors would like to thank M. Gasperini for useful discussions. This work is supported by the research grant “Theoretical Astroparticle Physics” No. 2012CPPYP7 under the program PRIN 2012 funded by the Ministero dell’Istruzione, Università e della Ricerca (MIUR). This work is also supported by the italian Istituto Nazionale di Fisica Nucleare (INFN) through the “Theoretical Astroparticle Physics” (TASP) project.
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Cosmai, L., Fanizza, G. & Tedesco, L. Cosmic Acceleration and f (R) Theory: Perturbed Solution in a Matter FLRW Model. Int J Theor Phys 55, 754–765 (2016). https://doi.org/10.1007/s10773-015-2713-0
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DOI: https://doi.org/10.1007/s10773-015-2713-0