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Gravitational redshift test with the space radio telescope “RadioAstron”

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Abstract

The space radio telescope “RadioAstron” is equipped with a high performance hydrogen maser frequency standard and thus provides a unique opportunity for a gravitational redshift test. We consider various modes of operation of the on-board scientific equipment and their impact on accuracy of the anticipated experiment. We find that the accuracy of the test is limited by ∼10−2 for the hardware configuration routinely used in radio astronomical observations, which is a consequence of using ballistic data to remove the nonrelativistic Doppler frequency shift from the analyzed signal. On the other hand, the so-called “Semi-coherent” mode of the on-board hardware provides for combining the space and ground maser signals in such a way that the resulting signal carries information about the useful effect but is free from the nonrelativistic Doppler and tropospheric frequency shifts. The proposed compensation scheme, which is different from the one used in the Gravity Probe A experiment, allows for testing the gravitational redshift effect with ∼10−6 accuracy.

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Correspondence to D. A. Litvinov.

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Original Russian Text © A.V. Biriukov, V.L. Kauts, V.V. Kulagin, D.A. Litvinov, V.N. Rudenko, 2014, published in Astronomicheskii Zhurnal, 2014, Vol. 91, No. 11, pp. 887–900.

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Biriukov, A.V., Kauts, V.L., Kulagin, V.V. et al. Gravitational redshift test with the space radio telescope “RadioAstron”. Astron. Rep. 58, 783–795 (2014). https://doi.org/10.1134/S1063772914110018

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  • DOI: https://doi.org/10.1134/S1063772914110018

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