This article is intended to review the recent developments in the Horndeski theory and its
generalization, which provide us with a systematic understanding of scalar–tensor theories …

The understanding of stellar structure represents the crossroads of our theories of the
nuclear force and the gravitational interaction under the most extreme conditions observably …

The dawn of the twenty-first century came with very positive prospects for gravity, cosmology,
and astrophysics. Technological progress made it possible for cosmology to enter to its …

The LIGO and VIRGO Collaborations have recently announced the detection of gravitational
waves from a neutron star–neutron star merger (GW170817) and the simultaneous …

A bstract We present all scalar-tensor Lagrangians that are cubic in second derivatives of a
scalar field, and that are degenerate, hence avoiding Ostrogradsky instabilities. Thanks to …

This paper reviews scalar–tensor theories characterized by a Lagrangian that, despite the
presence of second-order derivatives, contains a single scalar degree of freedom. These …

Theories of dark energy and modified gravity can be strongly constrained by astrophysical or
cosmological observations, as illustrated by the recent observation of the gravitational wave …

Long range scalar fields with a coupling to matter appear to violate known bounds on
gravitation in the solar system and the laboratory. This is evaded thanks to screening …

The Novel Probes Project, an initiative to advance the field of astrophysical tests of the dark
sector by creating a forum that connects observers and theorists, is introduced. This review …

Since the discovery of the accelerated expansion of the present universe, significant
theoretical developments have been made in the area of modified gravity. In the meantime …