19 citations · 33 across the 12 of their papers we have counts for
12 papers
Complexity hierarchies in Euclidean stars
L. Herrera, A. Di Prisco, J. Ospino
We establish a hierarchy of Euclidean stars according to their degree of complexity, as measured by the complexity factor and the complexity of the pattern of evolution. We conside…
The birth of a ghost star
L. Herrera, A. Di Prisco, J. Ospino
We present a model of an evolving spherically symmetric dissipative self-gravitating fluid distribution which tends asymptotically to a ghost star, meaning that the end state of su…
Evolution of self-gravitating fluid spheres involving ghost stars
L. Herrera, A. Di Prisco, J. Ospino
Exact solutions are presented which describe, either the evolution of fluid distributions corresponding to a ghost star (vanishing total mass), or describing the evolution of fluid…
Relativisitic non-pascalian fluid as a density contribution
Justo Ospino, Daniel Suárez-Urango, Laura M. Becerra +2
Understanding the role of pressure anisotropy and dissipation is crucial for modelling compact objects' internal structure and observable properties. In this work, we reinterpret l…
Ghost stars in general relativity
L. Herrera, A. Di Prisco, J. Ospino
We explore an idea put forward many years ago by Zeldovich and Novikov concerning the existence of compact objects endowed with arbitrarily small mass. The energy-density of such o…
The post--quasi-static approximation: An analytical approach to gravitational collapse
L. Herrera, A. Di prisco, J. Ospino
A semi--numerical approach proposed many years ago for describing gravitational collapse in the post--quasi--static approximation, is modified in order to avoid the numerical integ…
Irreversibility and gravitational radiation: A proof of Bondi's conjecture
L. Herrera, A. Di Prisco, J. Ospino
It is shown that the evolution of an axially and reflection symmetric fluid distribution, satisfying the Tolman condition for thermal equilibrium, is not accompanied by the emissio…
Quasi--hyperbolically symmetric -metric
L. Herrera, A. Di Prisco, J. Ospino +1
We carry out a systematic study on the motion of test particles in the region inner to the naked singularity of a quasi--hyperbolically symmetric -metric. The geodesic equations…
The physical acceptability conditions and the strategies to obtain anisotropic compact objects
Daniel Suárez-Urango, Laura M. Becerra, Justo Ospino +1
We studied five methods to include anisotropy, or unequal stress distributions, in general relativistic matter configurations. We used nine acceptability conditions that the metric…
Non-static fluid spheres admitting a conformal Killing vector: Exact solutions
L. Herrera, A. Di Prisco, J. Ospino
We carry on a general study on non--static spherically symmetric fluids admitting a conformal Killing vector (CKV). Several families of exact analytical solutions are found for dif…
Hyperbolically symmetric versions of Lemaitre-Tolman-Bondi spacetimes
L. Herrera, A. Di Prisco, J. Ospino
We study fluid distributions endowed with hyperbolical symmetry, which share many common features with Lemaitre-Tolman-Bondi (LTB) solutions (e.g. they are geodesic, shearing, non-…
Acceptability Conditions and Relativistic Anisotropic Generalized Polytropes
Daniel Suárez-Urango, J. Ospino, Héctor Hernández +1
This paper explored the physical acceptability conditions for anisotropic matter configurations in General Relativity. The study considered a generalized polytropic equation of sta…