Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2012-01-09
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
24 pages, 9 figures, Submitted as a contribution to the proceedings of the "VI International Meeting on Lorentzian Geometry, G
Scientific paper
In 1993 A. Ori \cite{Ori93} presented spacetimes violating the chronology condition in order to answer the question whether a time machine construction has to violate the weak energy condition or not. Later, in 2005 \cite{Ori05}, he constructed a class of time machine solutions with compact vacuum core. Both classes include an interesting global structure and it is possible to obtain closed timelike curves. Besides we focus on the geometric structure, in particular symmetries and geodesics, if feasible, and visualize several aspects.
Dietz Jürgen
Dirmeier Alexander
Scherfner Mike
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