RadioAstron gravitational redshift experiment: Status update

D. A. Litvinov*, U. Bach, N. Bartel, K. G. Belousov, M. Bietenholz, A. V. Biriukov, G. Cimó, D. A. Duev, L. I. Gurvits, A. V. Gusev, R. Haas, V. L. Kauts, B. Z. Kanevsky, A. V. Kovalenko, G. Kronschnabl, V. V. Kulagin, M. Lindqvist, G. Molera Calvés, A. Neidhardt, C. PlötzS. V. Pogrebenko, N. K. Porayko, V. N. Rudenko, A. I. Smirnov, K. V. Sokolovsky, V. A. Stepanyants, J. Yang, M. V. Zakhvatkin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

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 × 10−4. We expect to reach 2.5 × 10−5 with additional observations in 2016, an improvement of almost a magnitude over the 40-year old result of the GP-A mission.

Original languageEnglish
Title of host publication14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
EditorsRemo Ruffini, Massimo Bianchi, Remo Ruffini, Robert T Jantzen
PublisherWORLD SCIENTIFIC
Pages3569-3575
Number of pages7
ISBN (Electronic)9789813226593
Publication statusPublished - 1 Jan 2018
MoE publication typeA4 Article in a conference publication
EventMarcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Rome, Italy
Duration: 12 Jul 201518 Jul 2015
Conference number: 14

Conference

ConferenceMarcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
CountryItaly
CityRome
Period12/07/201518/07/2015

Keywords

  • General relativity
  • Gravitational redshift
  • RadioAstron
  • Spacecraft Doppler tracking

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