Search for variability in Newton’s constant using local gravitational acceleration measurements

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 0264-9381

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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 theory-based methods. © 2021 IOP Publishing Ltd.

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanu
Item Type: Article
Uncontrolled Keywords: data analysis; gravitational acceleration measurements; Newton's gravitational constant
Subjects: Others > Space research
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 15 Jul 2022 11:58
Last Modified: 15 Jul 2022 11:58
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