›› 2009, Vol. 28 ›› Issue (11): 24-24.
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Abstract: Solving the geodesic equation in （2＋1） dimensional de-Sitter space-time, we obtain the trace equation of ray. Analysing the solution, we find that there is not closed orbit in this space-time.
Key words: de-Sitter space-time, geodesic, ray trace
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