In this review we present a thoroughly comprehensive survey of recent work on modified
theories of gravity and their cosmological consequences. Amongst other things, we cover …

A wealth of astronomical data indicate the presence of mass discrepancies in the Universe.
The motions observed in a variety of classes of extragalactic systems exceed what can be …

Modified gravity theories have received increased attention lately due to combined
motivation coming from high-energy physics, cosmology, and astrophysics. Among …

On August 17, 2017 the LIGO interferometers detected the gravitational wave (GW) signal
(GW170817) from the coalescence of binary neutron stars. This signal was also …

Modified Newtonian dynamics (MOND) is a possible way to explain the flat galaxy rotation
curves without invoking the existence of dark matter. It is, however, quite difficult to predict …

The existence of dark matter in the universe has been solidly established in the last
decades, after the arrival of accurate cosmological and astrophysical observations, and …

Over the last few decades, astronomers and cosmologists have accumulated vast amounts
of data clearly demonstrating that our current theories of fundamental particles and of gravity …

A number of theories of gravity have been proposed as proxies for dark matter in the regime
of galaxies and cosmology. The recent observations of gravitational waves (GW170817) …

I consider an extended version of Bekenstein's Tensor-Vector-Scalar theory where the
action of the vector field is of a general Einstein-Ether form. This work presents the …

While tested to a high level of accuracy in the Solar system, general relativity is under the
spotlight of both theoreticians and observers on larger scales, mainly because of the need to …