3 papers
gr-qc2026
Thermodynamic Interpretation of the Kompanneets-Chernov-Kantowski-Sachs Solutions
Salvador Mengual, Joan Josep Ferrando
The spatially homogeneous perfect fluid solutions by Kompanneets-Chernov-Kantowski-Sachs are interpreted as a thermodynamic perfect fluid in isentropic evolution, namely, the isent…
gr-qc2026
Dimension of the isometry group in type N vacuum solutions: an IDEAL approach
Juan Antonio Sáez, Salvador Mengual, Joan Josep Ferrando
The necessary and sufficient conditions for a type N vacuum solution (with cosmological constant) to admit a group of isometries of dimension are given in terms of the invarian…
gr-qc2024
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…