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GR: Fachverband Gravitation und Relativitätstheorie
GR 16: Experimental Tests
GR 16.2: Vortrag
Freitag, 24. März 2023, 11:20–11:40, HSZ/0401
A concept for testing the gravitomagnetic clock effect with GNSS satellites — •Jan Scheumann1,2, Dennis Philipp1,2, Eva Hackmann1,2, Sven Herrmann1,2, Benny Rievers1,2, and Claus Lämmerzahl1,2 — 1ZARM, University of Bremen, 28359 Bremen, Germany — 2Gauss-Olbers Space Technology Transfer Center, Bremen, Germany
General Relativity (GR) predicts that the rotation of a central body influences the trajectory of an orbiting mass in a non-Newtonian way. One of the predicted effects was first described by Cohen and Mashhoon, concerning the proper time difference of two counter-revolving clocks in an orbit around a rotating mass, which is yet to be verified experimentally. After the accuracy of the tests of the gravitational redshift could be improved using two Galileo satellites on eccentric orbits, other possibilities to use GNSS satellites for tests of GR are under investigation. This work presents a concept to test the gravitomagnetic clock effect (GMCE) with GNSS satellites and looks into the technical requirements for such a test.
The introduced theoretical framework yields an incrementally defined observable, that is accesible e.g. via orbit and clock products. Some usage of the framework is presented, taking advantage of state-of-the-art orbit simulations as an a-priori data source.
A comparison of a dedicated mission's technical requirements with the state-of-the-art in SLR and modelling of gravitational and non-gravitational perturbations yields that a measurement is highly demanding, but might just be within reach of current technology.