# Bonn 2020 – wissenschaftliches Programm

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# GR: Fachverband Gravitation und Relativitätstheorie

## GR 6: Poster

### GR 6.5: Poster

### Dienstag, 31. März 2020, 17:00–18:30, Zelt

**Best Test of the Gravitational Redshift with the Satellites Galileo 5 and 6** — Sven Herrmann^{1}, Felix Finke^{1}, Meike List^{2}, Benny Rievers^{1}, and •Claus Lämmerzashl^{1, 2} — ^{1}ZARM, University of Bremen, Bremen, Germany — ^{2}DLR Institute for Satellite Geodesy and Inertial Sensing, Bremen, Germany

The gravitational redshift, i.e. the decrease in the frequency of light with altitude or the increase in the ticking rate of clocks with altitude, is one of the prominent predictions of Einstein's General Relativity. It is a particular important aspect of our understanding of space and time. This redshift has practical applications in positioning and geodesy. With increasingly accurate clocks (the most accurate clocks today would only go wrong by about 1 second after 30 billion years) it is important to know whether the influence of gravity on clocks is really as Einstein predicted. The best test so far was determined with a hydrogen maser in a rocket in a single parabolic flight. Since in 2014 the Galileo satellites 5 and 6 were put into a wrong, eccentric orbit due to a malfunction of the Fregat upper stage of the Soyuz rocket, the possibility arose to measure the periodic change in the rate of the atomic clocks on the Galileo satellites. A laborious data analysis showed an improvement of this test by a factor 5.