中国物理B ›› 1996, Vol. 5 ›› Issue (3): 161-169.doi: 10.1088/1004-423X/5/3/001
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梁灿彬1, 吴月江1, 邝志全2
KUANG ZHI-QUAN (邝志全)a, LIANG CAN-BIN (梁灿彬)b, WU YUE-JIANG (吴月江)b
摘要: The existence and location of conjugate points along null geodesics in Taub's vacuum spacetime is investigated in detail. It is shown that every null geodesic η not confined in a t-z plane contains two pairs of segments (M,M) and (N, N) such that each point p in M(resp.N) has a unique conjugate point p along η that is located in M (resp. N) and vice versa, and what is more interesting, if p and p are conjugate points along η with p∈J+(p), then p∈I+(p). This presents a realistic example illustrating that there do exist null geodesics emanating from p that can get into I+(p) before meeting a point conjugate to p. All results are generalized to a class of spacetimes.
中图分类号: (Classical general relativity)