Recently, much attention has been focused on the false vacuum islands that are flooded by
an expanding ocean of true-vacuum bubbles slightly later than most of the other parts of the …

We describe a realistic mechanism whereby black holes with significant QCD color charge
could have formed during the early Universe. Primordial black holes (PBHs) could make up …

We perform the numerical simulation of primordial black hole (PBH) formation from a
nonspherical profile of the initial curvature perturbation ζ. We consider the background …

Explaining the origin of supermassive black holes via a primordial origin is severely
challenged by the tight spectral distortion constraints on the amplitude of the primordial …

Various mechanisms have been suggested for the formation of Primordial Black Holes
(PBHs), and this thesis focuses on the standard mechanism based on the critical collapse of …

This review is an up-to-date account of the use of numerical relativity to study dynamical,
strong-gravity environments in a cosmological context. First, we provide a gentle introduction …

Primordial black holes (PBHs) may have formed through the gravitational collapse of
cosmological perturbations that were generated and stretched during the inflationary era …

Neutron stars provide a unique opportunity to study strongly interacting matter under
extreme density conditions. The intricacies of matter inside neutron stars and their equation …