401 citations · 2.9k across the 98 of their papers we have counts for
4 papers · 1 filter
On the viability of the truncated Israel-Stewart theory in cosmology
Dmitry Shogin, Per Amund Amundsen, Sigbjørn Hervik
We apply the causal Israel-Stewart theory of irreversible thermodynamics to model the matter content of the universe as a dissipative fluid with bulk and shear viscosity. Along wit…
-degenerate pseudo-Riemannian metrics
Sigbjorn Hervik, Anders Haarr, Kei Yamamoto
In this paper we study pseudo-Riemannian spaces with a degenerate curvature structure i.e. there exists a continuous family of metrics having identical polynomial curvature invaria…
The late-time behaviour of tilted Bianchi type VIII universes in presence of diffusion
Dmitry Shogin, Sigbjørn Hervik
We apply the dynamical systems approach to ever-expanding Bianchi type VIII cosmologies filled with a tilted -fluid undergoing velocity diffusion on a scalar field. We determine…
Dynamics of tilted Bianchi models of types III, IV, V in presence of diffusion
Dmitry Shogin, Sigbjørn Hervik
We investigate the three types of class B Bianchi cosmologies filled with a tilted perfect fluid undergoing velocity diffusion in a scalar field background. We consider the two mos…