Jordan-Brans-Dicke引力理论的观测特征
Observational signatures of Jordan-Brans-Dicke theories of gravity
摘要：
我们分析了引力的Jordan Brans Dicke模型（JBD），其中对广义相对论（GR）的偏离由与引力非最小耦合的标量场描述。该理论的特点是由一个恒定的耦合参数，$ω_{\rm JBD}$ ; GR恢复在极限$ω_{\rm JBD} \to \infty$。在这样的理论中，重力修改体现在早期，所以不能依赖于通常的方法，寻找不一致的膨胀历史和扰动增长，以区分JBD和GR。然而，我们表明，类似的技术可以成功地应用于早期和晚期的观测值。只有在使用正确的引力理论的情况下，从早期观测结果外推到现在的宇宙学参数才能与从直接的晚期观测结果中恢复的宇宙学参数相匹配。我们使用的主要CMB，将看到的普朗克卫星，作为早期的可观测的;和即将到来的和计划的超新星，重子声振荡和弱透镜实验作为晚期的可观测的。我们发现，检测值的$ω_{\rm JBD}$大到500和1000是即将到来的（2010年）和下一代（2020年）的实验，分别达到。
英文摘要：
We analyze the Jordan-Brans-Dicke model (JBD) of gravity, where deviations from General Relativity (GR) are described by a scalar field non-minimally coupled to gravity. The theory is characterized by a constant coupling parameter, $ω_{\rm JBD}$; GR is recovered in the limit $ω_{\rm JBD} \to \infty$. In such theories, gravity modifications manifest at early times, so that one cannot rely on the usual approach of looking for inconsistencies in the expansion history and perturbations growth in order to discriminate between JBD and GR. However, we show that a similar technique can be successfully applied to early and late times observables instead. Cosmological parameters inferred extrapolating early-time observations to the present will match those recovered from direct late-time observations only if the correct gravity theory is used. We use the primary CMB, as will be seen by the Planck satellite, as the early-time observable; and forthcoming and planned Supernovæ, Baryonic Acoustic Oscillations and Weak Lensing experiments as late-time observables. We find that detection of values of $ω_{\rm JBD}$ as large as 500 and 1000 is within reach of the upcoming (2010) and next-generation (2020) experiments, respectively.
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