Abstract The Galactic Center (GC) of the Milky Way, thanks to its proximity, allows to perform
astronomical observations that investigate physical phenomena at the edge of astrophysics …

Can a dynamically robust bosonic star (BS) produce an (effective) shadow that mimics that
of a black hole (BH)? We focus on models of spherical BSs with free scalar or vector fields …

While singularities are inevitable in the classical theory of general relativity, it is commonly
believed that they will not be present when quantum gravity effects are taken into account in …

The capability of the Event Horizon Telescope (EHT) to image the nearest supermassive
black hole candidates at horizon-scale resolutions offers a novel means to study gravity in its …

General relativity predicts that black holes are described by the Kerr metric, which has
integrable geodesics. This property is crucial to produce accurate waveforms from extreme …

Unique features of particle orbits produce novel signatures of gravitational observable
phenomena and are quite useful in testing compact astrophysical objects in general …

Abstract We consider a Proca-Higgs model wherein a complex vector field gains mass via
spontaneous symmetry breaking, by coupling to a real scalar field with a Higgs-type …

We study the physical properties of four-dimensional, string-theoretical, horizonless
“fuzzball” geometries by imaging their shadows. Their microstructure traps light rays straying …

Recently, spherical and static flat space solitons (balls) and self-gravitating, everywhere
regular, asymptotically flat solitons (stars) were constructed in an Einstein-Proca-Higgs …

We construct and study rotating axion boson stars (RABSs). These are the spinning
generalisations of the spherical gravitating solitons recently introduced in [1]. RABSs are …