Null Geodesics in Brane World Scenarios

作     者：ZHANGLi-Feng ZHANGYuan-Zhong 

作者机构：InstituteofTheoreticalPhysicstheChineseAcademyofSciencesP.O.Box2735Beijing100080China 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2004年第41卷第1期

页      面：48-50页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：The project supported by National Natural Science Foundation of China under Grant No.10175070 National Basic Research Project of China under Grant No.2003CB716300 

主　　题：brane universe null geodesic 

摘      要：We study the null bulk geodesic motion in the brane world in which the bulk metric has an un-stabilized extra spatial dimension. We find that the null bulk geodesic motion as observed on the 3-brane with Z2 symmetry would be a timelike geodesic motion even though there exists an extra non-gravitational force in contrast with the case of the stabilized extra spatial dimension. In other words the presence of the extra non-gravitational force would not violate the Z2 symmetry.