Space Clocks to Test Relativity: ACES and Beyond

Details Space Clocks to Test Relativity: ACES and Beyond Space Clocks to Test Relativity: ACES and Beyond

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.1803w&link_type=abstract

American Astronomical Society, IAU Symposium #261. Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Ana

Astronomy and Astrophysics

Astronomy

Scientific paper

Atomic clocks are an outstanding tool for the experimental verification of general relativity and more generally for fundamental astronomy (VLBI, pulsar timing, navigation, etc). Recent years have seen a rapid improvement in the performance of such clocks, promising new improved tests of relativity, in particular onboard terrestrial and interplanetary space missions. However, the use of such high accuracy clocks onboard spacecraft also requires detailed modelling and data analysis within the frame of general relativity and/or alternative theoretical frameworks.
In this talk I present the Atomic Clock Ensemble in Space (ACES) mission, a joint ESA/CNES project to be launched in 2012, with particular emphasis on relativistic aspects and the corresponding data analysis. The mission consists of two high accuracy atomic clocks (a hydrogen maser and a laser cooled Cs atomic clock) to be installed onboard the International Space Station (ISS) and a high performance microwave link (MWL) allowing the comparison between ground and space clocks.
The second part of the talk will be devoted to future missions making use of the more recent development of optical clocks and optical comparison methods, in particular the SAGAS project (Search for Anomalous Gravitation using Atomic Sensors), that aims to fly an optical atomic clock on a solar system escape trajectory with science objectives in fundamental physics and solar system science (arXiv: 0711.0304).

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