SpaceTime Mission: Clock Test of Relativityat Four Solar Radii

  • Lute Maleki
  • John Prestage
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 562)

Abstract

SpaceTime is a mission concept developed to test the Equivalence Principle. The mission is based on a clock experiment that will search for a violation of the Equivalence Principle through the observation of a variation of the fine structure constant, α. A spatio-temporal variation of α is expected in some string theories aimed at unifying gravity with other forces in nature. SpaceTime uses a special tri- clock instrument on a spacecraft which approaches the sun to within four solar radii. The instrument consists of three trapped ion clocks based on mercury, cadmium, and ytterbium ions, in the same environment. This configuration allows for a differential measurement of the frequency of the clocks and the cancellation of perturbations common to the three. The observation of any frequency drift between each of the clocks, as the tri-clock instrument approaches the sun, signals the existence of a scalar partner to the tensor gravity. Some relevant details of the mission design are discussed in the paper.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    C.M. Will: Theory and Experiment in Gravitational Physics (Cambridge University press, Cambridge 1981; Revised edition 1993).Google Scholar
  2. 2.
    T. Damour: in L. Maleki (Ed.) Proceedings of the Workshop on the Scientific Applications of Clocks in Space (JPL Publication 97–15, 1996), p. 13.Google Scholar
  3. 3.
    Y. Fujii: Prog. Theor. Phys. 99, 599 (1988).CrossRefADSGoogle Scholar
  4. 4.
    J.D. Prestage, R.L. Tjoelker, and L. Maleki: Phys. Rev. Lett. 74, 3511 (1995).CrossRefADSGoogle Scholar
  5. 5.
    T. Damour and A. M. Polyakov: Nuc. Phys. B 423, 542(1994).ADSCrossRefMathSciNetGoogle Scholar
  6. 6.
    T. Damour and F. Dyson: Nucl. Phys. B 480, 37 (1996).CrossRefADSGoogle Scholar
  7. 7.
    J.K. Webb, V.V. Flambaum, C.W. Churchill, M.J. Drinkwater, and J.D. Barrow: Phys. Rev. Lett. 82, 888 (1999).CrossRefADSGoogle Scholar
  8. 8.
    R.L. Tjoelker et al.: in J. Vig (ed.): Proceedings of 1996 IEEE International Frequency Control Symposium, 1996, p. 1073.Google Scholar
  9. 9.
    J.D. Prestage, R.L. Tjoelker, G.J. Dick, and L. Maleki: J. Mod. Optics 39, 232 (1992).CrossRefGoogle Scholar
  10. 10.
    L. Maleki: Proc. Europ. Freq. and Time Forum, Beconson, France, March 1995.Google Scholar
  11. 11.
    P.T.H. Fisk: Rep. Prog. Phys. 60, 761 (1997).CrossRefADSGoogle Scholar
  12. 12.
    G.J. Dick and C.A. Greenhall: Proc. 1998 IEEE International Freq. Control Symp., 99 (1998).Google Scholar
  13. 13.
    J.D. Prestage, R.L. Tjoelker, G.J. Dick, and L. Maleki: Proc. 1993 IEEE International Frequ. Control Symp. (Salt Lake City, USA 1993), p. 144.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Lute Maleki
    • 1
  • John Prestage
    • 1
  1. 1.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA

Personalised recommendations