Scalarization is a mechanism that endows strongly self-gravitating bodies, such as neutron
stars and black holes, with a scalar-field configuration. It resembles a phase transition in that …

In this paper, we first consider null geodesics of a class of charged, spherical and
asymptotically flat hairy black holes in an Einstein-Maxwell-scalar theory with a nonminimal …

Recently, the image of a Schwarzschild black hole with an accretion disk has been revisited,
and it showed that the “photon ring,” defined as highly bent light rays that intersect the disk …

A bstract For a static and spherically symmetric black hole, a photon sphere is composed of
circular null geodesics of fixed radius, and plays an important role in observing the black …

Black holes in scalar-Gauss-Bonnet gravity are prone to scalarization, that is a spontaneous
development of scalar hair for strong enough spacetime curvature. Since large spacetime …

A bstract In this paper, we construct scalarized rotating black holes within the framework of
Einstein-Maxwell-scalar models. These models incorporate non-minimal couplings that can …

It was recently found that, in certain flavors of scalar-Gauss-Bonnet gravity, linearly stable
bald black holes can coexist with stable scalarized solutions. The transition between both …

In this paper, we study spontaneous scalarization of asymptotically anti-de Sitter charged
black holes in an Einstein–Maxwell-scalar model with a non-minimal coupling between the …

We study gravitational lensing of light by hairy black holes, which, in a certain parameter
regime, can possess two photon spheres of different size outside the event horizon. In …

In the present paper, we show the existence of a fully nonlinear mechanism for the formation
of scalarized black holes, which is different from the spontaneous scalarization, and …