17 citations · 40 across the 9 of their papers we have counts for
8 papers · 1 filter
Kinematic Constraints in Generally Covariant Non-Linear Electrodynamics
Rico Berner, Horst-Heino von Borzeszkowski, Thoralf Chrobok
In this paper, we show how the motion of physical fields, in particular the electromagnetic potential, is connected with the choice of a space and time decomposition of the backgro…
Non-perfect-fluid space-times in thermodynamic equilibrium and generalized Friedmann equations
Konrad Schatz, Horst-Heino von Borzeszkowski, Thoralf Chrobok
We determine the energy-momentum tensor of non-perfect fluids in thermodynamic equilibrium. To this end, we derive the constitutive equations for energy density, isotropic and anis…
Are there Thermodynamical Degrees of Freedom of Gravitation?
H. -H. v. Borzeszkowski, T. Chrobok
In discussing fundamentals of general-relativistic irreversible continuum thermodynamics, this theory is shown to be characterized by the feature that no thermodynamical degrees of…
Screening and absorption of gravitation in pre-relativistic and relativistic theories
H. -H. von Borzeszkowski, T. Chrobok
After commenting on the early search for a mechanism explaining the Newtonian action-at-a-distance gravitational law we review non-Newtonian effects occurring in certain ansatzes f…
Rotation in string cosmology
Yuri N. Obukhov, Thoralf Chrobok, Mike Scherfner
We describe exact cosmological solutions with rotation and expansion in the low-energy effective string theory. These models are spatially homogeneous (closed Bianchi type IX) and…
Shear-free rotating inflation
Yuri N. Obukhov, Thoralf Chrobok, Mike Scherfner
We demonstrate the existence of shear-free cosmological models with rotation and expansion which support the inflationary scenarios. The corresponding metrics belong to the family…
On closed rotating worlds
Thoralf Chrobok, Yuri N. Obukhov, Mike Scherfner
A new solution for the stationary closed world with rigid rotation is obtained for the spinning fluid source. It is found that the spin and vorticity are locally balanced. This mod…
Classification of image distortions in terms of Petrov types
Thoralf Chrobok, Volker Perlick
An observer surrounded by sufficiently small spherical light sources at a fixed distance will see a pattern of elliptical images distributed over the sky, owing to the distortion e…