Bhagvati, Srinikitha and Desai, Shantanu
(2022)
Search for variability in Newton’s constant using local gravitational acceleration measurements.
Classical and Quantum Gravity, 39 (1).
017001.
ISSN 02649381
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Abstract
In a recent work, Dai (2021 Phys. Rev. D 103 064059) searched for a variability in Newton's constant G using the International Geodynamics and Earth Tide Service based gravitational acceleration measurements. However, this analysis, obtained from χ 2 minimization, did not incorporate the errors in the gravitational acceleration measurements. We carry out a similar search with one major improvement, wherein we incorporate these aforementioned errors. To model any possible variation in the gravitational acceleration, we fit the data to four models: a constant value, two sinusoidal models, and finally, a linear model for the variation of gravitational acceleration. We find that none of the four models provides a good fit to the data, showing that there is no evidence for a periodicity or a linear temporal variation in the acceleration measurements. We then redid these analyses after accounting for an unknown intrinsic scatter. After this, we find that although a constant model is still favored over the sinusoidal models, the linear variation for G is marginally preferred over a constant value, using information theorybased methods. © 2021 IOP Publishing Ltd.
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