18 citations · 32 across the 5 of their papers we have counts for
5 papers
Shear-free perfect fluids with a solenoidal electric curvature
Norbert Van den Bergh, John Carminati, Hamid Reza Karimian +1
We prove that the vorticity or the expansion vanishes for any shear-free perfect fluid solution of the Einstein field equations where the pressure satisfies a barotropic equation o…
Purely radiative perfect fluids with degenerate shear tensor
H. R. Karimian, N. Van den Bergh, L. De Groote
We consider non-rotating geodesic perfect fluid spacetimes which are purely radiative in the sense that the gravitational field satisfies the covariant transverse conditions div H…
Shearfree perfect fluids with solenoidal magnetic curvature and a gamma-law equation of state
Norbert Van den Bergh, John Carminati, Hamid Reza Karimian
We show that shearfree perfect fluids obeying an equation of state p=(gamma -1) mu are non-rotating or non-expanding under the assumption that the spatial divergence of the magneti…
Purely radiative perfect fluids
B. Bastiaensen, H. R. Karimian, N. Van den Bergh +1
We study `purely radiative' (div E = div H = 0) and geodesic perfect fluids with non-constant pressure and show that the Bianchi class A perfect fluids can be uniquely characterize…
Purely radiative irrotational dust spacetimes
N Van den Bergh, B Bastiaensen, H R Karimian +1
We consider irrotational dust spacetimes in the full non-linear regime which are "purely radiative" in the sense that the gravitational field satisfies the covariant transverse con…