42 citations · 227 across the 18 of their papers we have counts for
19 papers
Obtaining the multiple Debever null directions
Juan Antonio Sáez, Salvador Mengual, Joan Josep Ferrando
The explicit expression of the multiple Debever null directions of an algebraically special spacetime are obtained in terms of the electric and magnetic parts of the Weyl tensor. A…
Dimension of the isometry group in three-dimensional Riemannian spaces
Joan Josep Ferrando, Juan Antonio Sáez
The necessary and sufficient conditions for a three-dimensional Riemannian metric to admit a group of isometries of dimension acting on s-dimensional orbits are obtained. These…
Homogeneous three-dimensional Riemannian spaces
Joan Josep Ferrando, Juan Antonio Sáez
The necessary and sufficient conditions for a three-dimensional Riemannian metric to admit a transitive group of isometries are obtained. These conditions are Intrinsic, Deductive,…
Relativistic kinematic approach to the classical ideal gas
Joan Josep Ferrando, Juan Antonio Sáez
he necessary and sufficient conditions for a unit time-like vector field to be the unit velocity of a classical ideal gas are obtained. In a recent paper [Coll, Ferrando and Sáez,…
A hydrodynamic approach to the classical ideal gas
Bartolomé Coll, Joan Josep Ferrando, Juan Antonio Sáez
The necessary and sufficient condition for a conservative perfect fluid energy tensor to be the energetic evolution of a classical ideal gas is obtained. This condition forces the…
On the relativistic compressibility conditions
Bartolomé Coll, Joan Josep Ferrando, Juan Antonio Sáez
The constraints imposed by the relativistic compressibility hypothesis on the square of the speed of sound in a medium are obtained. This result allows to obtain purely hydrodynami…