Very compact objects probe extreme gravitational fields and may be the key to understand
outstanding puzzles in fundamental physics. These include the nature of dark matter, the …

The existence of black holes and spacetime singularities is a fundamental issue in science.
Despite this, observations supporting their existence are scarce, and their interpretation is …

Abstract In Cardoso et al.[6] it was claimed that quasinormal modes which any stationary,
spherically symmetric and asymptotically flat black hole emits in the eikonal regime are …

Structure at the horizon scale of black holes would give rise to echoes of the gravitational
wave signal associated with the postmerger ringdown phase in binary coalescences. We …

We study the stability of quasinormal modes (QNM) in asymptotically flat black hole
spacetimes by means of a pseudospectrum analysis. The construction of the Schwarzschild …

Wormholes are hypothetical topologically-non-trivial structures of spacetime. From the
theoretical point of view, the possibility of their existence is challenging but cannot be ruled …

Originally proposed as a tool for teaching the general theory of relativity, wormholes are
today approached in many different ways and are seeing as an efficient alternative for …

An analytical solution representing traversable asymptotically flat and symmetric wormholes
was obtained without adding exotic matter in two different theories independently: in the …

Static and spherically symmetric wormhole solutions can be reconstructed in the framework
of curvature based Extended Theories of Gravity. In particular, extensions of the General …

The recent observation of the shadow of the supermassive compact object M87* by the
Event Horizon Telescope (EHT) collaboration has opened up a new window to probe the …