Median statistics estimates of Hubble and Newton's constants

被引:25
|
作者
Bethapudi, Suryarao [1 ]
Desai, Shantanu [1 ]
机构
[1] IIT Hyderabad, Dept Phys, Kandi 502285, Telangana, India
来源
EUROPEAN PHYSICAL JOURNAL PLUS | 2017年 / 132卷 / 02期
关键词
PLANCK; H-0;
D O I
10.1140/epjp/i2017-11390-3
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Robustness of any statistics depends upon the number of assumptions it makes about the measured data. We point out the advantages of median statistics using toy numerical experiments and demonstrate its robustness, when the number of assumptions we can make about the data are limited. We then apply the median statistics technique to obtain estimates of two constants of nature, Hubble constant (H-0) and Newton's gravitational constant (G), both of which show significant differences between different measurements. For H-0, we update the analyses done by Chen and Ratra (2011) and Gott et al. (2001) using 576 measurements. We find after grouping the different results according to their primary type of measurement, the median estimates are given by H-0 = 72.5(-8)(+2.5) km/sec/Mpc with errors corresponding to 95% c.l. (2 sigma) and G = 6.674702(-0.0009)(+0.0014) x 10(-11) Nm(2)kg(-2) corresponding to 68% c.l. (1 sigma).
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页数:8
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