a1 LNE-SYRTE, Observatoire de Paris, CNRS, UPMC 61, avenue de l'Observatoire, 75014 Paris, France
a2 Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Département de Physique de l'Ecole Normale Supérieure, 75231 Paris, France
a3 Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Case 74, Campus Jussieu, 75252 Paris, France
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. We present the scientific motivations of such tests taking the ACES Salomon et al. and SAGAS Wolf et al. (2009) projects as particular examples.
Note: This material is in part based upon work supported by the National Science Foundation under Grant No. 0843236. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.