It is now known that when a massive star collapses under the force of its own gravity, the
final fate of such a continual gravitational collapse will be either a black hole or a naked …

We provide a systematic study for the accretion of a collisionless, relativistic kinetic gas into
a nonrotating black hole. To this end, we first solve the relativistic Liouville equation on a …

In the case of unhindered gravitational collapse of a matter cloud governed by the Lemaître-
Tolman-Bondi (LTB) spacetime, the end-state singularity is either locally visible, globally …

We analyze the redshift suffered by photons originating from an external source, traversing a
collapsing dust cloud, and finally being received by an asymptotic observer. In addition, we …

Abstract Conformal Carter–Penrose diagrams are used for the visualization of hyperboloidal
slices, which are smooth spacelike slices reaching null infinity. The focus is on the …

We present a new covariant, gauge-invariant formalism describing linear metric perturbation
fields on any spherically symmetric background in general relativity. The advantage of this …

In general relativity, gravitational collapse of matter fields ends with the formation of a
spacetime singularity, where the matter density becomes infinite and standard physics …

We suggest that the redshift of photons traveling from past to future null infinity through a
collapsing object could provide an observational signature capable of differentiating …

We analyze the behavior of causal geodesics on a Kerr-de Sitter spacetime with particular
emphasis on their completeness property. We set up an initial value problem of which the …

Motivated by the goal for high accuracy modeling of gravitational radiation emitted by
isolated systems, recently, there has been renewed interest in the numerical solution of the …