26 citations · 72 across the 7 of their papers we have counts for
7 papers
Different representations of the Levi-Civita Bertotti Robinson solution
Oyvind Gron, Steinar Johannesen
The Levi-Civita Bertotti Robinson (LBR) spacetime is investigated in various coordinate systems. By means of a general formalism for constructing coordinates in conformally flat sp…
A solution of the Einstein-Maxwell equations describing conformally flat spacetime outside a charged domain wall
Oyvind Gron, Steinar Johannesen
We derive and discuss the physical interpretation of a conformally flat, static solution of the Einstein-Maxwell equations. It is argued that it describes a conformally flat, stati…
FRW Universe Models in Conformally Flat Spacetime Coordinates. III: Universe models with positive spatial curvature
Oyvind Gron, Steinar Johannesen
We deduce general expressions for the line element of universe models with positive spatial curvature described by conformally flat spacetime coordinates. Models with dust, radiati…
FRW Universe Models in Conformally Flat Spacetime Coordinates. II: Universe models with negative and vanishing spatial curvature
Oyvind Gron, Steinar Johannesen
We deduce general expressions for the line element of universe models with negative and vanishing spatial curvature described by conformally flat spacetime coordinates. The empty M…
FRW Universe Models in Conformally Flat Spacetime Coordinates. I: General Formalism
Oyvind Gron, Steinar Johannesen
The 3-space of a universe model is defined at a certain simultaneity. Hence space depends on which time is used. We find a general formula generating all known and also some new tr…
A spacetime with closed timelike geodesics everywhere
Oyvind Gron, Steinar Johannesen
In the present article we find a new class of solutions of Einstein's field equations. It describes stationary, cylindrically symmetric spacetimes with closed timelike geodesics ev…