摘要
类光测地线γ0 (λ)与二维类空超曲面 φ正交 ,λ为其仿射参量 .假如在类光测地线γ0 (λ)上存在一点r(r=γ0(λr) )共轭于类空超曲面 φ ,则对于γ0 (λ)上任一点q(q =γ0 (λq) )满足λq>λr,一定能把γ0 连续变形成一条从 φ到q的类时曲线 .当产生类时曲线的变分矢量场不是类光测地线上的广义Jacobi场时 ,这些类时曲线在趋于类光测地线时 。
When a null geodesic γ 0 ,orthogonal to a space_like two_surface φ ,is from φ to q with a point r∈(φ,q) conjugate to φ along γ 0(λ) ,there will be a variation of γ 0(λ) which will give time_like curves from φ to q .This is a well_known theory in the famous bood.When the variation vector is not a generalized Jacobi field on the null geodesic γ 0 ,the acceleration of these time_like curves approaches infinity as the time_like curves approach the null geodesic.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第6期1662-1664,共3页
Acta Physica Sinica
基金
国家自然科学基金 (批准号 :10 0 73 0 0 2
10 3 73 0 0 3
10 3 4715 1
10 3 75 0 0 8)资助的课题~~