In this paper we construct a charged thin-shell gravastar model within the context of
noncommutative geometry. To do so, we choose the interior of the nonsingular de Sitter …

A bstract The emergence of a four-dimensional de Sitter (dS 4) universe on an expanding
bubble in the five-dimensional anti-de Sitter (AdS 5) background has been suggested as a …

It was investigated recently, with the aim of testing the weak cosmic censorship conjecture,
whether an extremal Kerr black hole can be converted into a naked singularity by interaction …

We investigate the thermodynamic equilibrium states of a rotating thin shell, ie, a ring, in a
(2+ 1)-dimensional spacetime with a negative cosmological constant. The inner and outer …

We consider a particle collision with a high center-of-mass energy near a Bañados-
Teitelboim-Zanelli (BTZ) black hole. We obtain the center-of-mass energy of two general …

Hawking radiation acts as a cosmic censor since it carries away the angular momentum of
the black hole, proportionally more than its mass. In this work we first show that an extremal …

A bstract We investigate time-dependent spherically symmetric solutions of the four-
dimensional Einstein-Maxwell-axion-dilaton system, with the dilaton coupling that occurs in …

Spherical gravitational collapse towards a black hole with non-zero tangential pressure is
studied. Exact solutions corresponding to different equations of state are given. We find that …

We study the gravitational collapse of two thin shells of matter, in asymptotically flat
spacetime or constrained to move within a spherical box. We show that this simple two-body …

It was one of the greatest acivements of the first decades of the last century to find a
mathematical description of gravitational appearances that explains several observations in …