Florencia A. Teppa Pannia, Santiago E. Perez Bergliaffa
By means of a cosmographical approach to the redshift drift, together with a series development of the Hubble parameter for an arbitrary f(R) theory, we obtain a restriction on f and some of its derivatives evaluated at the present epoch. It is show that, when applied to specific forms of f(R), this restriction (which depends on the values of the kinematical parameters today) leads to bounds on the parameters of the theory that are more stringent than those previously obtained.
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http://arxiv.org/abs/1301.6140
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