6 citations · 29 across the 11 of their papers we have counts for
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gr-qc2023★ 2 cited
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…
gr-qc2023★ 1 cited
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…