288 citations · 649 across the 13 of their papers we have counts for
13 papers
Viscous Cosmology for Early- and Late-Time Universe
Iver Brevik, Øyvind Grøn, Jaume de Haro +2
From a hydrodynamicist's point of view the inclusion of viscosity concepts in the macroscopic theory of the cosmic fluid would appear most natural, as an ideal fluid is after all a…
Viscous ΛCDM Universe Models
Nouraddin Mostafapoor, Oyvind Gron
We explore flat ΛCDM models with bulk viscosity, and study the role of the bulk viscosity in the evolution of these universe models. The dynamical equations for these models are ob…
The significance of the Schott energy for the conservation of energy of a radiating charge
O. Gron
It is demonstrated that energy is conserved during runaway motion of a radiating charge, and during free fall of a charge in a field of gravity. The decisive role of the Schott ene…
Statefinder analysis of universe models with a viscous cosmic fluid and a fluid with a non-linear equation of state
Oyvind Gron
In the present article we analyze, by means of the statefinder parameter formalism, some universe models introduced by Brevik and co-workers. We determine constants that earlier we…
An electromagnetic perpetuum mobile?
Øyvind Grøn, Sigurd Kirkevold Næss
A charge moving freely in orbit around the Earth radiates according to Larmor's formula. If the path is closed, it would constitute a perpetuum mobile. The solution to this energy…
Perihelion precession in spherically symmetric Kaluza-Klein theories
Oystein Elgaroy, Oyvind Gron, Sigbjorn Hervik
We consider the perihelion precession and bending of light in a class of Kaluza-Klein models and show that the "electric redshift" model, proposed in Zhang (2006) to explain the re…