136 citations · 459 across the 6 of their papers we have counts for
6 papers
On the Newtonian Limit of the Weyl Tensor
Juergen Ehlers, Thomas Buchert
In this note we wish to complement some recent work in the cosmological literature concerning the Weyl conformal curvature tensor and its parts. In particular, we shall give a clea…
Active Mass Under Pressure
Juergen Ehlers, Istvan Ozsvath, Engelbert Schucking
After a historical introduction to Poisson's equation for Newtonian gravity, its analog for static gravitational fields in Einstein's theory is reviewed. It appears that the pressu…
The Theory of Caustics and Wavefront Singularities with Physical Applications
Juergen Ehlers, Ezra T. Newman
This is intended as an introduction to and review of the work of V, Arnold and his collaborators on the theory of Lagrangian and Legendrian submanifolds and their associated maps.…
Newtonian Cosmology in Lagrangian Formulation: Foundations and Perturbation Theory
Juergen Ehlers, Thomas Buchert
The ``Newtonian'' theory of spatially unbounded, self--gravitating, pressureless continua in Lagrangian form is reconsidered. Following a review of the pertinent kinematics, we pre…
Averaging inhomogeneous Newtonian cosmologies
Thomas Buchert, Juergen Ehlers
Idealizing matter as a pressureless fluid and representing its motion by a peculiar--velocity field superimposed on a homogeneous and isotropic Hubble expansion, we apply (Lagrangi…
Light Propagation in Arbitrary Spacetimes and the Gravitational Lens Approximation
Stella Seitz, Peter Schneider, Juergen Ehlers
We reformulate the transport equation which determines the size, shape and orientation of infinitesimal light beams in arbitrary spacetimes. The behaviour of such light beams near…