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arXiv · 2303.17213

Planetary seismology as a test of modified gravity proposals

Aleksander Kozak·Aneta Wojnar
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Abstract

We demonstrate that it is possible to test models of gravity, such as Palatini $f(R)$ and Eddington-inspired Born-Infeld models, using seismic data from Earth. By incorporating additional limitations on Earth's moment of inertia and mass given from observational data, the models' parameters can be restricted to a $2\sigma$ level of accuracy. Our novel tool provides that the parameter $\beta$ parametrizing the quadratic curvature term in the gravitational Lagrangian of Palatini $f(R)$ gravity is constrained to $\beta\lesssim 10^9 \text{m}^2$ while the Eddington-inspired Born-Infeld gravity parameter $\epsilon$ is restricted to $\epsilon\lesssim 4\cdot 10^9 \text{m}^2$. We also discuss further enhancements to the proposed method, aimed at imposing even more stringent constraints on modified gravity proposals.

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Aleksander Kozak, Aneta Wojnar. 2023-03-30. Planetary seismology as a test of modified gravity proposals. https://doi.org/10.1103/physrevd.108.044055

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