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Given, in an arbitrary spacetime (M, g), a 2-dimensional timelike subman-ifold Σ and an observer field n on Σ, we assign gravitational, centrifugal, Coriolis and Euler forces to every particle worldline λ in Σ with respect to n. We prove that centrifugal and Coriolis forces vanish, for all λ in Σ with respect to any n, if and only if Σ is a photon… (More)

In Schwarzschild spacetime the value r = 3m of the radius coordinate is characterized by three different properties: (a) there is a " light sphere " , (b) there is " centrifugal force reversal " , (c) it is the upper limiting radius for a non-transparent Schwarschild source to act as a gravitational lens that produces infinitely many images. In this paper… (More)

We discuss the geometry of timelike surfaces (two-dimensional submanifolds) in a Lorentzian manifold and its interpretation in terms of general relativity. A classification of such surfaces is presented which distinguishes four cases of special algebraic properties of the second fundamental form from the generic case. In the physical interpretation a… (More)

- Oliver Aubel, Eberhard Bugiel, Dietmar Krüger, Wolfgang Hasse, Martina Hommel
- Microelectronics Reliability
- 2006

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