Comment on “Measurements of Newton's gravitational constant and the length of day” by Anderson J. D. et al.
Abstract
There have been recent claims (Anderson et al., EPL, 110, 10002) of a 5.9 year periodicity in measurements of Newton's gravitational constant, $G$, which show a very strong correlation with observed periodic variations in the length of the day. I have used Bayesian model comparison to test this claim compared to other hypotheses that could explain the variation in the $G$ measurements. I have used the data from the initial claim, and from an updated set of compiled $G$ measurements that more accurately reflect the experimental dates, and find that a model containing an additional unknown Gaussian noise component is hugely favoured, by factors of $\gtrsim e^{30}$, over two models allowing for a sinusoidal component.
 Publication:

EPL (Europhysics Letters)
 Pub Date:
 August 2015
 DOI:
 10.1209/02955075/111/30002
 arXiv:
 arXiv:1505.06725
 Bibcode:
 2015EL....11130002P
 Keywords:

 General Relativity and Quantum Cosmology;
 Physics  Classical Physics
 EPrint:
 To be published in EPL. This is an abridged version of the original document to conform the the journal's "Comment" page limit, therefore further figures, tables and explanation of the analysis can be found in v1 arXiv:1505.06725v1. This also contains a response to the comment arXiv:1508.00532. The analysis code and figures can be found at https://github.com/mattpitkin/periodicG