古老主序星引力常量宇宙时间变化的星震约束
Asteroseismic constraints on the cosmic-time variation of the gravitational constant from an ancient main-sequence star
摘要：
我们调查的变化的引力常量$G$在宇宙的历史模拟的演化和星震学的低质量恒星KIC 7970740，这是一个最古老的（~11 Gyr）和观测最好的类太阳振荡器在银河系。从这些数据中，我们发现了$\dot{G}/G = (1.2 \pm 2.6) \times 10^{-12}~\text{yr}^{-1}$，即没有证据表明$G$存在任何变异。我们还发现一个贝叶斯asterosephic估计宇宙的年龄以及天体物理的S-因子的五个核反应，通过12维恒星演化马尔可夫链蒙特卡罗模拟。
英文摘要：
We investigate the variation of the gravitational constant $G$ over the history of the Universe by modeling the effects on the evolution and asteroseismology of the low-mass star KIC 7970740, which is one of the oldest (~11 Gyr) and best-observed solar-like oscillators in the Galaxy. From these data we find $\dot{G}/G = (1.2 \pm 2.6) \times 10^{-12}~\text{yr}^{-1}$, that is, no evidence for any variation in $G$. We also find a Bayesian asteroseismic estimate of the age of the Universe as well as astrophysical S-factors for five nuclear reactions obtained through a 12-dimensional stellar evolution Markov chain Monte Carlo simulation.
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