Cosmological constraints on scalar-tensor gravity and the variation of the gravitational constant
Cosmological constraints on scalar-tensor gravity and the variation of the gravitational constant
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DOI：
10.1093/ptep/ptx046
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
J. Ooba;K. Ichiki;T. Chiba;N. Sugiyama
中科院分区：
文献类型：
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作者：
J. Ooba;K. Ichiki;T. Chiba;N. Sugiyama
我们通过分析从普朗克2015结果中获得的宇宙微波背景的角功率谱数据以及重子声振荡（BAO）数据，提出了引力标量张量理论的宇宙学约束。我们发现，BAO数据的加入使有效引力常数随时间变化的约束条件提高了10%以上，即有效引力常数在重组时期和现在时期之间的时间变化被约束为G_{\rmrec}/G_0-1 <1.9\times10 ^{-3}\（95. 45\rmC.L.}）而$G_{\rm rec}/G_0-1 <5.5\times10 ^{-3}\（99. 99\% C.L.}）$。我们还讨论了先验选择的约束的依赖性。
We present cosmological constraints on the scalar-tensor theory of gravity by analyzing the angular power spectrum data of the cosmic microwave background obtained from the Planck 2015 results together with the baryon acoustic oscillations (BAO) data. We find that the inclusion of the BAO data improves the constraints on the time variation of the effective gravitational constant by more than $10\%$, that is, the time variation of the effective gravitational constant between the recombination and the present epochs is constrained as $G_{\rm rec}/G_0-1 <1.9\times 10^{-3}\ (95.45\%\ {\rm C.L.})$ and $G_{\rm rec}/G_0-1 <5.5\times 10^{-3}\ (99.99 \%\ {\rm C.L.})$. We also discuss the dependence of the constraints on the choice of the prior.