Scientists are investigating the use of Earth's seismic motions to test alternative models of gravity beyond Einstein's general theory of relativity. By analyzing seismic waves under modified gravity, researchers can constrain these theories and continue the search for a more complete understanding
are physical entities rests on the assumption that our understanding of gravity is correct. Currently, our best understanding of gravity comes from Einstein’s general theory of relativity. This theory tells us that gravity is the manifestation of the bending and warping of space-time itself.
But we know that general relativity is incomplete. We know that it breaks down in the centers of black holes and at the beginning of the universe. So we know we do not yet have the full story of gravity in our hands. Motivated by this, many people over the decades have proposed theories of modified gravity, which constitute a set of extensions and refinements to Einstein’s original model..
The more ways we can develop to probe modified gravity the better. And so a team of researchers has found that weto test various modified theories of gravity. We can instead look down into the Earth. They discovered that under modified gravity, seismic waves travel through the Earth at different rates and in different ways.
Since we know so many properties of the Earth so well, like its mass and its moment of inertia, we can turn this knowledge around to use seismic data to constrain modified gravity theories. So far the data do not suggest any need for a deviation from Einstein’s original work. But the more tools we develop, and the more ways we can search, the better.
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