CMB Tensor Anisotropies in Metric f(R) Gravity
  We present a description of CMB anisotropies generated by tensor perturbations in f(R) theories of gravity. The temperature power spectrum in the special case of $f(R)=R^n$ is computed using a modified version of CAMB package. 
Hassan Bourhrous, \'Alvaro de la Cruz-Dombriz and Peter Dunsby
gr-qc