Acceleration of the Universe in f(R) Gravity Models
  A general formalism for the investigation of the late time dynamics of the universe for any analytic f(R) gravity model, along with a cold dark matter, has been discussed in the present work. The formalism is then elucidated with two examples. The values of the parameters of the models are chosen in such a way that they are consistent with the basic observational requirement. 
Ankan Mukherjee and Narayan Banerjee
gr-qc astro-ph.CO