It is proved that in Taub's and Kar's plane-symmetric spacetime,a future directed null geodesic emanating from a point"p"will enter the chronological future of"p".Physically,this implies th...It is proved that in Taub's and Kar's plane-symmetric spacetime,a future directed null geodesic emanating from a point"p"will enter the chronological future of"p".Physically,this implies that the light signal from a movie projector with its back to the screen will finally come back to the screen and form a movie which looks exactly the same as the true one.展开更多
基金supported in part by the Science Fund of the Ministry of Eduction of the People's Republic of China.
文摘It is proved that in Taub's and Kar's plane-symmetric spacetime,a future directed null geodesic emanating from a point"p"will enter the chronological future of"p".Physically,this implies that the light signal from a movie projector with its back to the screen will finally come back to the screen and form a movie which looks exactly the same as the true one.
