Özcan Sert, Muzaffer Adak
In this paper, we investigate the inflation and the late-time acceleration of the universe by using the modified gravity approach which involves the non-minimal $Y(R) F^2$-type couplings of electromagnetic fields to gravity. After we derive field equations by a first order variational principle from the Lagrangian of the non-minimally coupled theory, we look for spatially flat cosmological solutions with the large-scale magnetic fields. At the end we estimate certain values according to observations for three parameters occurring in the solutions.
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http://arxiv.org/abs/1203.1531
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