Testing the possibility of models of gravity different from general relativity may be closer to home than we think.
appears to be the dominant form of matter in the Universe, with each galaxy containing up to 80 percent of this invisible form of matter. Meanwhile, dark energy is some source of energy that suffuses all of space-time and is responsible for the accelerated expansion of the cosmos.
But we know the general theory of relativity is incomplete. We know that it breaks down in the centers ofand at the beginning of the universe. So we know we do not yet have the full story of gravity in our hands. The more ways we can develop to probe modified gravity the better. And so a team of researchers have 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.
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