We discuss the correspondence between the DGP brane cosmology and 5DRicci-flat cosmology by letting their metrics equal each other. By thiscorrespondence, a specific geometrical property of the arbitrary integralconstant I in DGP metric is given and it is related to the curvature of 5Dbulk. At the same time, the relation of arbitrary functions $\mu$ and $\nu$ ina class of Ricci-flat solutions is obtained from DGP brane metric.
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机译：通过让它们的度量彼此相等，我们讨论了DGP麸皮宇宙学和5DRicci-扁平宇宙学之间的对应关系。通过这种对应，给出了DGP度量中任意整数常数I的特定几何特性，并且与5Dbulk的曲率有关。同时，从DGP brane度量中获得一类Ricci-flat解中任意函数$ \ mu $和$ \ nu $的关系。
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