Publication: On the stability of the cosmological solutions in f(R, G) gravity
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2012-12-21
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Institute of Physics
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Abstract
Modified gravity is one of the most promising candidates for explaining the current accelerating expansion of the Universe, and even its unification with the inflationary epoch. Nevertheless, the wide range of models capable of explaining the phenomena of dark energy imposes that current research focuses on a more precise study of the possible effects of modified gravity on both cosmological and local levels. In this paper, we focus on the analysis of a type of modified gravity, the so-called f(R, G) gravity, and we perform a deep analysis on the stability of important cosmological solutions. This not only can help to constrain the form of the gravitational action, but also facilitate a better understanding of the behavior of the perturbations in this class of higher order theories of gravity, which will lead to a more precise analysis of the full spectrum of cosmological perturbations in future.
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© 2012 IOP Publishing Ltd. We would like to thank Sergei D. Odintsov and Antonio López Maroto for useful discussions on the topic. AdlCD acknowledges financial support from URC (South Africa) and MICINN (Spain) projects numbers FIS2011-23000, FPA2011-27853-C02-01 and Consolider-Ingenio MULTIDARK CSD2009-00064. DSG acknowledges support from a postdoctoral contract from the University of the Basque Country (UPV/EHU)under the program “Specialization of research staff”. DSG is also supported by the research project FIS2010-15640, and also by the Basque Government through the special research action KATEA and UPV/EHU under program UFI 11/55.
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