We study the null bulk geodesic motion in the brane world in which the bulk metric has an un-stabilizedextra spatial dimension. We find that the null bulk geodesic motion as observed on the 3-brane with Z2 symmetry wo...We study the null bulk geodesic motion in the brane world in which the bulk metric has an un-stabilizedextra spatial dimension. We find that the null bulk geodesic motion as observed on the 3-brane with Z2 symmetry wouldbe a timelike geodesic motion even though there exists an extra non-gravitational force in contrast with the case of thestabilized extra spatial dimension. In other words the presence of the extra non-gravitational three would not violate the Z2 symmetry.展开更多
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
文摘We study the null bulk geodesic motion in the brane world in which the bulk metric has an un-stabilizedextra spatial dimension. We find that the null bulk geodesic motion as observed on the 3-brane with Z2 symmetry wouldbe a timelike geodesic motion even though there exists an extra non-gravitational force in contrast with the case of thestabilized extra spatial dimension. In other words the presence of the extra non-gravitational three would not violate the Z2 symmetry.
