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How accurately has general relativity's prediction of gravitational redshift been measured?

Physics Asked by Zamicol on April 12, 2021

According to Einstein’s general relativity, massive bodies should cause gravitational redshift.

How accurately has this been measured?

2 Answers

A recent test (2018) using atomic clocks aboard two satellites found general relativity's gravitational redshift prediction to be accurate to $(+0.19 pm 2.48)times10^{-5}$.

This was not a planned experiment and the satellites had accidentally been delivered on elliptic rather than circular orbits in 2014. They were useless for their original purpose of navigation. Instead of taking a complete loss, the satellites were repurposed for experimentation.

Previously the most accurate measurement was taken in 1976 by Gravity Probe A which had an accuracy of 70 parts per million. The new test improves the accuracy by a factor of 5.6.

See the paper, "A gravitational redshift test using eccentric Galileo satellites".

Correct answer by Zamicol on April 12, 2021

Fifty years, ago, the Pound-Rebka experiment demonstrated gravitational blue shift on Earth in a tower at Harvard, to an accuracy of 10%.

Answered by m4r35n357 on April 12, 2021

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