RadioAstron gravitational redshift experiment: status update
A test of a cornerstone of general relativity, the gravitational redshift effect, is currently being conducted with the RadioAstron spacecraft, which is on a highly eccentric orbit around Earth. Using ground radio telescopes to record the spacecraft signal, synchronized to its ultra-stable on-board...
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| Veröffentlicht in: | arXiv.org 2016-05 |
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| creator | Litvinov, D A Bach, U Bartel, N Belousov, K G Bietenholz, M Biriukov, A V Cimo, G Duev, D A Gurvits, L I Gusev, A V Haas, R Kauts, V L Kanevsky, B Z Kovalenko, A V Kronschnabl, G Kulagin, V V Lindqvist, M G Molera Calves Neidhardt, A Ploetz, C Pogrebenko, S V Porayko, N K Rudenko, V N Smirnov, A I Sokolovsky, K V Stepanyants, V A Yang, J Zakhvatkin, M V |
| description | A test of a cornerstone of general relativity, the gravitational redshift effect, is currently being conducted with the RadioAstron spacecraft, which is on a highly eccentric orbit around Earth. Using ground radio telescopes to record the spacecraft signal, synchronized to its ultra-stable on-board H-maser, we can probe the varying flow of time on board with unprecedented accuracy. The observations performed so far, currently being analyzed, have already allowed us to measure the effect with a relative accuracy of \(4\times10^{-4}\). We expect to reach \(2.5\times10^{-5}\) with additional observations in 2016, an improvement of almost a magnitude over the 40-year old result of the GP-A mission. |
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| subjects | Eccentric orbits Gravitational effects Neutrons Radio telescopes Red shift Relativity |
| title | RadioAstron gravitational redshift experiment: status update |
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