178 citations · 474 across the 34 of their papers we have counts for
34 papers
Motion of a thin spherically symmetric Shell of Dust in the Schwarzschild field
H. -J. Schmidt
The equation of motion announced in the title was already deduced for the cases the inner metric being flat and the shell being negligibly small (test matter), using surface layers…
Exact radial solution in 2+1 gravity with a real scalar field
H. -J. Schmidt, D. Singleton
In this paper we give some general considerations about circularly symmetric, static space-times in 2+1 dimensions, focusing first on the surprising (at the time) existence of the…
The tetralogy of Birkhoff theorems
Hans-Jürgen Schmidt
We classify the existent Birkhoff-type theorems into four classes: First, in field theory, the theorem states the absence of helicity 0- and spin 0-parts of the gravitational field…
Perihelion advance for orbits with large eccentricities in the Schwarzschild black hole
H. -J. Schmidt
We deduce a new formula for the perihelion advance of a test particle in the Schwarzschild black hole by applying a newly developed non-linear transformation within the Schwarzschi…
Gauss-Bonnet lagrangian G ln G and cosmological exact solutions
H. -J. Schmidt
For the lagrangian L = G ln G where G is the Gauss-Bonnet curvature scalar we deduce the field equation and solve it in closed form for 3-flat Friedman models using a statefinder p…
Perihelion precession for modified Newtonian gravity
H. -J. Schmidt
We calculate the perihelion precession delta for nearly circular orbits in a central potential V(r). Differently from other approaches to this problem, we do not assume that the po…