Null Geodesics in Brane World Scenarios  

作　　者：ZHANGLi-Feng ZHANGYuan-Zhong 

机构地区：[1]InstituteofTheoreticalPhysics,theChineseAcademyofSciences,P.O.Box2735,Beijing100080,China

出　　处：《Communications in Theoretical Physics》2004年第1期48-50,共3页理论物理通讯（英文版）

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

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 Z<SUB>2</SUB> 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 Z<SUB>2</SUB> symmetry.

关 键 词：brane universe null geodesic 

分 类 号：P159.4[天文地球—天文学]