We review the topic of 4D Einstein–Gauss–Bonnet (4DEGB) gravity, which has been the
subject of considerable interest over the past two years. Our review begins with a general …

We consider the status of black hole (BH) solutions with nontrivial scalar fields but no gauge
fields, in four-dimensional asymptotically flat spacetimes, reviewing both classical results …

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 …

We consider a general Einstein-scalar-Gauss-Bonnet theory with a coupling function f (ϕ).
We demonstrate that black-hole solutions appear as a generic feature of this theory since a …

Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and
more generally fundamental physics, particularly with regards to the existence of additional …

This review summarizes the current status of the energy conditions in general relativity and
quantum field theory. We provide a historical review and a summary of technical results and …

Beyond Einstein's Gravity is a graduate level introduction to extended theories of gravity and
cosmology, including variational principles, the weak-field limit, gravitational waves …

In Einstein's gravitational theory, the spacetime is Riemannian, that is, it has vanishing
torsion and vanishing nonmetricity (covariant derivative of the metric). In the gauging of the …

In the context of the Einstein-scalar-Gauss-Bonnet theory, with a general coupling function
between the scalar field and the quadratic Gauss-Bonnet term, we investigate the existence …

A bstract We present a class of exact scalar-tensor black holes for a shift-symmetric part of
the Horndeski action. The action includes a higher order scalar tensor interaction term. We …