Germani Cristiano, Sopuerta Carlos F
Institute of Cosmology and Gravitation, Portsmouth University, Portsmouth PO1 2EG, United Kingdom.
Phys Rev Lett. 2002 Jun 10;88(23):231101. doi: 10.1103/PhysRevLett.88.231101. Epub 2002 May 21.
We consider brane world scenarios including the leading correction to the Einstein-Hilbert action suggested by superstring theory, the Gauss-Bonnet term. We obtain and study the complete set of equations governing the cosmological dynamics. We find they have the same form as those in Randall-Sundrum scenarios but with time-varying four-dimensional gravitational and cosmological constants. By studying the bulk geometry we show that this variation is produced by bulk curvature terms parametrized by the mass of a black hole. Finally, we show there is a coupling between these curvature terms and matter that can be relevant for early universe cosmology.
我们考虑膜世界情景，其中包括超弦理论所提出的对爱因斯坦 - 希尔伯特作用量的主导修正项，即高斯 - 博内项。我们得到并研究了支配宇宙学动力学的完整方程组。我们发现它们与兰德尔 - 桑德鲁姆情景中的方程具有相同的形式，但具有随时间变化的四维引力常数和宇宙学常数。通过研究体几何结构，我们表明这种变化是由以黑洞质量为参数的体曲率项产生的。最后，我们表明这些曲率项与物质之间存在一种耦合，这可能与早期宇宙宇宙学相关。
