Einstein’s description of gravity just got much harder to beat

Einstein's description of gravity just got much harder to beat
Visualization of the new gauge developed to test the predictions of modified gravity theories against the measurement of the size of the M87 shadow. Credit: D. Psaltis, UArizona; EHT Collaboration

Einstein’s theory of general relativity—the idea that gravity is matter warping spacetime—has withstood over 100 years of scrutiny and testing, including the newest test from the Event Horizon Telescope collaboration, published today in the latest issue of Physical Review Letters.

According to the findings, Einstein’s theory just got 500 times harder to beat.

Despite its successes, Einstein’s robust theory remains mathematically irreconcilable with quantum mechanics, the scientific understanding of the subatomic world. Testing general relativity is important because the ultimate theory of the universe must encompass both gravity and quantum mechanics.

“We expect a complete theory of gravity to be different from general relativity, but there are many ways one can modify it. We found that whatever the correct

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