We review recent developments and results in testing general relativity (GR) at cosmological
scales. The subject has witnessed rapid growth during the last two decades with the aim of …

After a decade and a half of research motivated by the accelerating universe, theory and
experiment have reached a certain level of maturity. The development of theoretical models …

We review recent progress in the construction of modified gravity models as alternatives to
dark energy as well as the development of cosmological tests of gravity. Einstein's theory of …

We study the structure of scalar-tensor theories of gravity based on derivative couplings
between the scalar and the matter degrees of freedom introduced through an effective …

We propose a minimal description of single field dark energy/modified gravity within the
effective field theory formalism for cosmological perturbations, which encompasses most …

We find spherically symmetric and static black holes in shift-symmetric Horndeski and
beyond Horndeski theories. They are asymptotically flat and sourced by a non trivial static …

We review black hole and star solutions for Horndeski theory. For non-shift symmetric
theories, black holes involve a Kaluza–Klein reduction of higher dimensional Lovelock …

We model the linear and nonlinear growth of large scale structure in the Cubic Galileon
gravity model, by running a suite of N-body cosmological simulations using the ECOSMOG …

The gravitational wave event GW170817 together with its electromagnetic counterparts
constrains the speed of gravity to be extremely close to that of light. We first show, on the …

We discuss the consistency of a recently proposed class of theories described by an
arbitrary function of the Ricci scalar, the trace of the energy-momentum tensor, and the …