Asteroseismic Constraints on the Cosmic-time Variation of the Gravitational Constant from an Ancient Main-sequence Star

被引：29
作者：
Bellinger, Earl Patrick [1 ]
Christensen-Dalsgaard, Jorgen [1 ]
机构：
[1] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 887卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
SOLAR; VARIABILITY; TESTS;
D O I：
10.3847/2041-8213/ab43e7
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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 (similar to 11 Gyr) and best-observed solar-like oscillators in the Galaxy. From these data we find (G)over dot/G = (1.2 +/- 2.6) x 10(-12) 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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页数：4
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