326 citations · 2.3k across the 40 of their papers we have counts for
40 papers
The imprints of the instantaneous appearance of a conformal Killing vector field on the evolution of self-gravitating fluid spheres
L. Herrera, A. Di Prisco, J. Ospino
We study the influence of the instantaneous appearance of a conformal Killing vector (CKV) in self-gravitating fluid spheres during their evolution. For doing that we introduce a t…
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…
Cracking and complexity of self-gravitating dissipative compact objects
L. Herrera, A. Di Prisco
The concept of cracking refers to the tendency of a fluid distribution to "split'', once it abandons the equilibrium. In this manuscript we develop a general formalism to describe…
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…
Expansion-free dissipative fluid spheres: Analytical models
L. Herrera, A. Di Prisco, J. Ospino
We search exact analytical solutions of spherically symmetric dissipative fluid distributions satisfying the vanishing expansion condition (vanishing expansion scalar ). To do s…
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…
The transition of a gravitationally radiating, dissipative fluid, to equilibrium
L. Herrera, A. Di Prisco, J. Ospino
We describe the transition of a graviationally radiating, axially and reflection symmetric dissipative fluid, to a non--radiating state. It is shown that very shortly after the end…
Earliest stages of the non-equilibrium in axially symmetric, self-gravitating, dissipative fluids
L. Herrera, A. Di Prisco, J. Ospino +1
We report a study on axially and reflection symmetric dissipative fluids, just after its departure from hydrostatic and thermal equilibrium, at the smallest time scale at which the…
The spacetime outside a source of gravitational radiation: The axially symmetric null fluid
L. Herrera, A. Di Prisco, J. Ospino
We carry out a study of the exterior of an axially and reflection symmetric source of gravitational radiation. The exterior of such a source is filled with a null fluid produced by…
Axially symmetric dissipative fluids in the quasi--static approximation
L. Herrera, A. Di Prisco, J. Ospino +1
Using a framework based on the formalism we carry out a study on axially and reflection symmetric dissipative fluids, in the quasi--static regime. We first derive a set of in…
Shearing and geodesic axially symmetric perfect fluids that do not produce gravitational radiation
L. Herrera, A. Di Prisco, J. Ospino +1
Using a framework based on the 1+3 formalism we carry out a study on axially and reflection symmetric perfect and geodesic fluids, looking for possible models of sources radiating…
Conformally flat polytropes for anisotropic matter
L. Herrera, A. Di Prisco, W. Barreto +1
We analyze in detail conformally flat spherically symmetric fluid distributions, satisfying a polytropic equation of state. Among the two possible families of relativistic polytrop…
Shear-free axially symmetric dissipative fluids
L. Herrera, A. Di Prisco, J. Ospino
We study the general properties of axially symmetric dissipative configurations under the shear-free condition. The link between the magnetic part of the Weyl tensor and the vortic…
Dissipative collapse of axially symmetric, general relativistic, sources: A general framework and some applications
L. Herrera, A. Di Prisco, J. Ibañez +1
We carry out a general study on the collapse of axially (and reflection) symmetric sources in the context of general relativity. All basic equations and concepts required to perfor…
Nature of the vorticity in the Gödel spacetime
L. Herrera, J. Ibáñez, A. Di Prisco
The physical meaning of the vorticity of the matter content in Gödel spacetime is analyzed in some detail. As we shall see, unlike the situation in general stationnary axially symm…
Axially symmetric static sources: A general framework and some analytical solutions
L. Herrera, A. Di Prisco, J. Ibañez +1
We provide all basic equations and concepts required to carry out a general study on axially symmetric static sources. The Einstein equations and the conservation equations are wri…
Vorticity and entropy production in tilted Szekeres spacetimes
L. Herrera, A. Di Prisco, J. Ibañez +1
We analyze the properties of the tilted Szekeres spacetime, i.e. the version of such spacetime as seen by a congruence of observers with respect to which the fluid is moving. The i…
Reversible Dissipative Processes, Conformal Motions and Landau Damping
L. Herrera, A. Di Prisco, J. Ibañez
The existence of a dissipative flux vector is known to be compatible with reversible processes, provided a timelike conformal Killing vector (CKV) (where …
Cylindrically Symmetric Relativistic Fluids: A Study Based on Structure Scalars
L. Herrera, A. Di Prisco J. Ospino
The full set of equations governing the structure and the evolution of self--gravitating cylindrically symmetric dissipative fluids with anisotropic stresses, is written down in te…
On the Role of Electric Charge and Cosmological Constant in Structure Scalars
L. Herrera, A. Di Prisco, J. Ibañez
The physical meaning of structure scalars is analyzed for charged dissipative spherical fluids and for neutral dust in the presence of cosmological constant. The role played by suc…
Tilted Lemaitre-Tolman-Bondi Spacetimes: Hydrodynamic and Thermodynamic Properties
L. Herrera, A. Di Prisco, J. Ibañez
We consider Lemaitre-Tolman-Bondi spacetimes from the point of view of a tilted observer, i.e. one with respect to which the fluid is radially moving. The imperfect fluid and the c…
Expansion-Free Cavity Evolution: Some exact Analytical Models
A. Di Prisco, L. Herrera, J. Ospino +2
We consider spherically symmetric distributions of anisotropic fluids with a central vacuum cavity, evolving under the condition of vanishing expansion scalar. Some analytical solu…