Null Geodesics in Brane World Scenarios |
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| Authors: | ZHANG Li-Feng and ZHANG Yuan-Zhong |
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| Affiliation: | Institute of Theoretical Physics, the Chinese Academy of Sciences,P.O. Box 2735, Beijing 100080, China |
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| Abstract: | We study the null bulk geodesic motion in the brane world inwhich the bulk metric has an un-stabilized extra spatial dimension.We find that the null bulk geodesic motion as observed on the3-brane with Z2 symmetry would be a timelike geodesic motioneven though there exists an extra non-gravitational force incontrast with the case of the stabilized extra spatial dimension.In other words the presence of the extra non-gravitational forcewould not violate the Z2 symmetry. |
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| Keywords: | brane universe null geodesic |
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