401 citations · 2.9k across the 98 of their papers we have counts for
3 papers · 2 filters
Type III and N universal spacetimes
Sigbjørn Hervik, Vojtech Pravda, Alena Pravdova
Universal spacetimes are spacetimes for which all conserved symmetric rank-2 tensors, constructed as contractions of polynomials from the metric, the Riemann tensor and its covaria…
Evolution of a Simple Inhomogeneous Anisotropic Cosmological Model with Diffusion
Dmitry Shogin, Sigbjorn Hervik
We investigate a simple inhomogeneous anisotropic cosmology (plane symmetric model) filled with a tilted perfect fluid undergoing velocity diffusion on a scalar field. Consid…
Electric and magnetic Weyl tensors in higher dimensions
Sigbjørn Hervik, Marcello Ortaggio, Lode Wylleman
Recent results on purely electric (PE) or magnetic (PM) spacetimes in n dimensions are summarized. These include: Weyl types; diagonalizability; conditions under which direct (or w…