12 citations · 24 across the 3 of their papers we have counts for
4 papers
Existence and Stability of Circular Orbits in Time-Dependent Spherically Symmetric Spacetimes
Wolfgang Graf
For a general spherically four--dimensional metric the notion of "circularity" of a family of equatorial geodesic trajectories is defined in geometrical terms. The main object turn…
Ricci Flow Gravity
Wolfgang Graf
A theory of gravitation is proposed, modeled after the notion of a Ricci flow. In addition to the metric an independent volume enters as a fundamental geometric structure. Einstein…
Geometric Dilaton Coupling and Smooth Charged Wormholes
Wolfgang Graf
A particular type of coupling of the dilaton field to the metric is shown to admit a simple geometric interpretation in terms of a volume element density independent from the metri…
Nonanalytic extensions of the extreme Reissner-Nordstroem metric in terms of weak solutions
Wolfgang Graf
A basic extension of the exterior part of the extreme Reissner-Nordstroem solution in terms of a continuous metric and gauge potential is constructed. This extension is not smooth…