27. June 2014
I.D. Saltas, I. Sawicki. L. Amendola, M. Kunz, [arXiv:1406.7139]
We demonstrate that in those models extending general relativity, where anisotropic stress
appears in the scalar sector of linear perturbations, the propagation of gravitational waves is also modified.
This is a very general relationship and likely can be used to constrain models of modifications of gravity
in a new way.