修改后的重力：没有伯克霍夫的生活。DGP
Modified Gravity: living without Birkhoff I. DGP
摘要：
我们考虑的后果，伯克霍夫定理的修改引力理论的缺席。作为一个例子，我们计算了Dvali-Gabadaze-Porrati模型（DGP）中球质量壳对测试粒子的引力。我们表明，不同于在广义相对论，力取决于质量分布。特别地，球质量壳内的重力取决于块体的几何结构，并且可能是非零的。
英文摘要：
We consider the consequences of the absence of Birkhoff's theorem in theories of modified gravity. As an example, we calculate the gravitational force on a test particle due to a spherical mass shell in the Dvali-Gabadaze-Porrati model (DGP). We show that unlike in General Relativity, the force depends on the mass distribution. In particular, the gravitational force within a spherical mass shell depends on the geometric structure of the bulk, and is likely non-zero.
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