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 …

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 …

Gravitational waves emitted from the coalescence of neutron star binaries open a new
window to probe matter and fundamental physics in unexplored, extreme regimes. To extract …

Invertible disformal transformations serve as a useful tool to explore ghost-free scalar-tensor
theories. In this paper, we construct a generalization of invertible disformal transformations …

Scalar fields have played an important role in the development of the fundamental theories
of physics as well as in other branches of physics such as gravitation and cosmology. For a …

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 …

We study the properties of compact objects in a particular 4D Horndeski theory originating
from higher dimensional Einstein-Gauss-Bonnet gravity. Remarkably, an exact vacuum …

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 …