5 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…
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…
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…
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…