arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.2949gr-qc
收藏

膜世界宇宙学与变化的$G$

Brane-world cosmology and varying $G$

Leonardo Amarilla, Hector Vucetich

摘要:

考虑一个耦合到体标量场的膜世界宇宙模型。由于膜张力与牛顿耦合$G$成正比,在这样的模型中,自然会出现$G$的时间变化。通过对$G$的变化范围的有效约束,对模型的参数进行约束。来自核合成和CMB的约束是最重要的约束。

英文摘要:

We consider a brane-world cosmological model coupled to a bulk scalar field. Since the brane tension turns out to be proportional to Newton coupling $G$, in such a model a time variation of $G$ naturally occurs. By resorting to available bounds on the variation of $G$, the parameters of the model are constrained. The constraints coming from nucleosynthesis and CMB result to be the severest ones.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑