Planetary seismology as a test of modified gravity proposals

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.

arXiv comment11 pages, 3 figures

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