Probing the gravitational redshift with an Earth-orbiting satellite
D.A. Litvinov, V.N. Rudenko, A.V. Alakoz, U. Bach, N. Bartel, A.V., Belonenko, K.G. Belousov, M. Bietenholz, A.V. Biriukov, R. Carman, G. Cim\'o,, C. Courde, D. Dirkx, D.A. Duev, A.I. Filetkin, G. Granato, L.I. Gurvits, A.V., Gusev, R. Haas, G. Herold, A. Kahlon, B.Z. Kanevsky
TL;DR
This paper proposes a novel method using the RadioAstron satellite to test the gravitational redshift effect with higher accuracy than previous experiments, supporting Einstein's Equivalence Principle.
Contribution
It introduces a modified Doppler compensation scheme leveraging RadioAstron's orbit and atomic clock to improve gravitational redshift measurement precision.
Findings
Preliminary results align with Einstein Equivalence Principle
Expected accuracy of 10^{-5} in gravitational redshift testing
Method benefits from RadioAstron's eccentric orbit and stable atomic clock
Abstract
We present an approach to testing the gravitational redshift effect using the RadioAstron satellite. The experiment is based on a modification of the Gravity Probe A scheme of nonrelativistic Doppler compensation and benefits from the highly eccentric orbit and ultra-stable atomic hydrogen maser frequency standard of the RadioAstron satellite. Using the presented techniques we expect to reach an accuracy of the gravitational redshift test of order , a magnitude better than that of Gravity Probe A. Data processing is ongoing, our preliminary results agree with the validity of the Einstein Equivalence Principle.
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