9 citations · 12 across the 3 of their papers we have counts for
3 papers
Dimension of the isometry group in spacetimes with an invariant frame
Juan Antonio Sáez, Salvador Mengual, Joan Josep Ferrando
The necessary and sufficient conditions for a spacetime with an invariant frame to admit a group of isometries of dimension are given in terms of the connection tensor asso…
On the flow of perfect energy tensors
Juan Antonio Sáez, Salvador Mengual, Joan Josep Ferrando
The necessary and sufficient conditions are obtained for a unit time-like vector field to be the unit velocity of a divergence-free perfect fluid energy tensor. This plainly ki…
Labeling spherically symmetric spacetimes with the Ricci tensor
Joan Josep Ferrando, Juan Antonio Sáez
We complete the intrinsic characterization of spherically symmetric solutions partially accomplished in a previous paper [Class.Quant.Grav. (2010) 27 205024]. In this approach we c…