Quadrupolar gravitational radiation as a test-bed for f(R)-gravity
  The debate concerning the viability of f(R)-gravity as a natural extension of General Relativity could be realistically addressed by using results coming from binary pulsars like PSR 1913+16. To this end, we develop a quadrupolar approach to the gravitational radiation for a class of ana- lytic f(R)-models. We show that experimental results are compatible with a consistent range of f(R)-models. This means that f(R)-gravity is not ruled out by the observations and gravitational radiation (in strong field regime) could be a test-bed for such theories. 
Mariafelicia De Laurentis, Salvatore Capozziello
gr-qc astro-ph.HE hep-th