Mathematics – Differential Geometry
Scientific paper
2010-11-22
Mathematics
Differential Geometry
Version accepted by the Trans. of the AMS. Section 5 deleted
Scientific paper
We show that every closed Lorentzian surface contains at least two closed
geodesics. Explicit examples show the optimality of this claim. Refining this
result we relate the least number of closed geodesics to the causal structure
of the surface and the homotopy type of the Lorentzian metric.
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