Publications (6)
Ricci Collineations for Non-Degenerate, Diagonal and Spherically Symmetric Ricci Tensors
G. Contreras, L. A. Núñez, U. Percoco
The expression of the vector field generator of a Ricci Collineation for diagonal, spherically symmetric and non-degenerate Ricci tensors is obtained. The resulting expressions sho…
On the Eccentricity Behaviour of Radiating Slowly Rotating Bodies
L. Herrera, H. Hernandez, L. A. Nunez +1
We study different models of radiating slowly rotating bodies up to the first order in the angular velocity. It is shown that up to this order the evolution of the eccentricity is…
Comment on Ricci Collineations of Static Spherically Symmetric Spacetimes
R. Bertolotti, G. Contreras, L. A. Núñez +2
We present a counter example to a theorem given by Amir {\em et al.} J. Math. Phys. {\bf 35}, 3005 (1994). We also comment on a misleading statements of the same reference.
Nonlocal Equation of State in General Relativistic Radiating Spheres
H. Hernandez, L. A. Nunez, U. Percoco
We show that under particular circumstances a general relativistic spherically symmetric bounded distribution of matter could satisfy a nonlocal equation of state. This equation re…
Ricci Collineations for type B warped space-times
J. Carot, L. A. Núnez, U. Percoco
We present the general structure of proper Ricci Collineations (RC) for type B warped space-times. Within this framework, we give a detailed description of the most general proper…
On the general structure of Ricci collineations for type B warped spacetimes
J. L. Flores, Y. Parra, U. Percoco
A complete study of the structure of Ricci collineations for type B warped spacetimes is carried out. This study can be used as a method to obtain these symetries in such spacetime…