A century ago, Einstein formulated his elegant and elaborate theory of General Relativity,
which has so far withstood a multitude of empirical tests with remarkable success …

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 massive gravity. We start by showing how different theories of
massive gravity emerge from a higher-dimensional theory of general relativity, leading to the …

We introduce the Vainshtein mechanism which plays a crucial role in massive gravities, as
well as in related theories such as Galileons and their extensions. This mechanism, also …

This review is dedicated to recent progress in the field of classical, interacting, massive spin-
2 theories, with a focus on ghost-free bimetric theory. We will outline its history and its …

We study the effects of momentum relaxation on observables in a recently proposed
holographic model in which the conservation of momentum in the field theory is broken by …

Massive gravity provides a holographic model for theories exhibiting momentum
dissipation.<? format?> We provide an analytic expression for the DC conductivity. The …

We investigate the coupling to matter in ghost-free massive (bi-) gravity. When species in the
matter sector couple covariantly to only one metric, we show that at one-loop these …

We present an exact spherical black hole solution in de Rham, Gabadadze, and Tolley
(dRGT) massive gravity for a generic choice of the parameters in the theory, and also …

We show the analysis of a thin accretion disk around a static and spherically symmetric
black hole in dRGT massive gravity. We present the accretion disk analysis in a gravitational …