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 …

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 …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

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 …

Mimetic gravity is a Weyl‐symmetric extension of General Relativity, related to the latter by a
singular disformal transformation, wherein the appearance of a dust‐like perfect fluid can …

Recent cosmological observations have posed a challenge for traditional theories of gravity:
what is the force driving the accelerated expansion of the universe? What if dark energy or …

Abstract The Event Horizon Telescope (EHT) collaboration recently unveiled the first image
of the supermassive black hole M87*, which exhibited a ring of angular diameter θ d= 42±3 …

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 …

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 progress in theoretical modeling of compact high-mass stars in the context of alternative
gravity has become important in minimizing challenges associated with neutron star (NS) …