引力子从膜发射到体再返回到膜
Bouncing of gravitons emitted from the brane to the bulk back to the brane
摘要：
在一个额外一维的宇宙学模型中研究了描述引力子在体中传播的测地线方程的解。膜与物质嵌在主体中。结果表明，在宇宙学早期，从膜发射到体的引力子在一定条件下可以返回到膜。该模型被讨论在两个可选的方法：（i）膜与静态度规在AdS空间中移动，和（ii）膜位于一个固定的位置在额外的维与非静态度规。执行从一个图片到另一个图片的坐标变换。在这两种方法的条件下，引力子发射到散装回来的膜被发现。
英文摘要：
Solutions of geodesic equations describing propagation of gravitons in the bulk are studied in a cosmological model with one extra dimension. Brane with matter is embedded in the bulk. It is shown that in the period of early cosmology gravitons emitted from the brane to the bulk under certain conditions can return back to the brane. The model is discussed in two alternative approaches: (i) brane with static metric moving in the AdS space, and (ii) brane located at a fixed position in extra dimension with non-static metric. Transformation of coordinates from the one picture to another is performed. In both approaches conditions for gravitons emitted to the bulk to come back to the brane are found.
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