Inflationary Tensor Perturbation in Eddington-inspired Born-Infeld   gravity
  We investigate the tensor perturbation in the inflation model driven by a massive-scalar field in Eddington-inspired Born-Infeld gravity. For short wave-length modes, the perturbation feature is very similar to that of the usual chaotic inflation. For long wave-length modes, the perturbation exhibits a peculiar rise in the power spectrum which may leave a signature in the cosmic microwave background radiation. 
Inyong Cho and Hyeong-Chan Kim
gr-qc astro-ph.CO