A bstract We study certain bi-scalar-tensor theories emanating from conformal symmetry
requirements of Horndeski's four-dimensional action. The former scalar is a Galileon with …

abstract In this chapter, we will discuss a particular higher order gravity theory, Lovelock
theory, that generalises in higher dimensions than 4, general relativity. After briefly …

The coupling of the electromagnetic field to gravity is an age-old problem. Presently, there is
a resurgence of interest in it, mainly for two reasons:(i) Experimental investigations are …

We investigate weak and strong deflection gravitational lensings of the regular black hole
predicted by a non-minimal Einstein–Yang–Mills theory. We find that its weak deflection …

We consider new regular exact spherically symmetric solutions of a nonminimal Einstein–
Yang-Mills theory with a cosmological constant and a gauge field of magnetic Wu-Yang …

A bstract We study the renormalization of a particular sector of Horndeski theory. In
particular, we focus on the nonminimal coupling of a scalar field to the Gauss-Bonnet term …

We investigate the non-minimal couplings between the electromagnetic fields and gravity
through the natural logarithm of the curvature scalar. After we give the Lagrangian …

In this paper, we study the dynamics of a test particle around a regular black hole (BH) in a
non-minimal Einstein-Yang-Mills (EYM) theory and examine the BH shadow. The EYM …

We discuss new exact spherically symmetric static solutions to non-minimally extended
Einstein–Yang–Mills equations. The obtained solution to the Yang–Mills subsystem is …

It was recently pointed out that some precise Photon-Galileon couplings in four dimensions
(4D)--inspired by a higher dimensional reduction--are enough to obtain a Horndeski theory …