198 citations · 3.3k across the 147 of their papers we have counts for
147 papers
Big Bang revisited
Frans R. Klinkhamer
The Friedmann cosmological solution of the standard Einstein gravitational field equation has a curvature singularity at a moment in time known as the Big Bang. It has been suggest…
Big Bang as spacetime defect
F. R. Klinkhamer
We review the suggestion that it is possible to eliminate the Big Bang curvature singularity of the Friedmann cosmological solution by considering a particular type of degenerate s…
Higher-dimensional extension of a vacuum-defect wormhole
F. R. Klinkhamer
We present a 5D metric which interpolates between the standard 4D Schwarzschild metric with mass parameter and a new 4D -deformed vacuum-defect-wormhole metric. The 5D space…
New Type of Traversable Wormhole
Frans R. Klinkhamer
We review a new traversable-wormhole solution of the gravitational field equation of general relativity without exotic matter. Instead of having exotic matter to keep the wormhole…
Vacuum-defect wormholes and a mirror world
F. R. Klinkhamer
We have recently discovered a smooth vacuum-wormhole solution of the first-order equations of general relativity. Here, we obtain the corresponding multiple-vacuum-wormhole solutio…
Defect wormhole: A traversable wormhole without exotic matter
F. R. Klinkhamer
We present a traversable-wormhole solution of the gravitational field equation of General Relativity without need of exotic matter (exotic matter can, for example, have negative en…