18 citations · 36 across the 4 of their papers we have counts for
4 papers
Non-aligned Einstein-Maxwell Robinson-Trautman fields of Petrov type D
Norbert Van den Bergh, John Carminati
We discuss Petrov type D Einstein-Maxwell fields in which both double null eigenvectors of the Weyl tensor are non-aligned with the eigenvectors of a non-null electromagnetic field…
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…
Performance of Buchberger's Improved Algorithm using Prime Based Ordering
Peter Horan, John Carminati
Prime-based ordering which is proved to be admissible, is the encoding of indeterminates in power-products with prime numbers and ordering them by using the natural number order. U…
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…