## Linear perturbations in Eddington-inspired Born-Infeld gravity    [PDF]

Ke Yang, Xiao-Long Du, Yu-Xiao Liu
We study the full linear perturbations of a homogeneous and isotropic spacetime in the Eddington-inspired Born-Infeld gravity. The stability of the perturbations are analyzed in the Eddington regime. We find that the scalar and transverse vector modes are stable, and the transverse-traceless tensor mode is unstable for positive $\kappa$. However, these modes are unstable and hence cause the instabilities for negative $\kappa$.
View original: http://arxiv.org/abs/1307.2969