Proper Time Experiments in Gravitational Fields with Atomic Clocks, Aircraft, and Laser Light Pulses

  • Carroll O. Alley
Part of the NATO Advanced Science Institutes Series book series (NSSB, volume 94)

Abstract

Quantum Optics is a part of the more general subject of Quantum Electronics which includes atomic clocks as well as lasers. By utilizing our understanding of the quantum mechanical properties of ground state hyperfine transitions at microwave frequencies in certain atoms, very stable clocks have been made which allow highly accurate time measurements. Similar knowledge of optical transitions between electronic energy states in atoms allows lasers to be made with their many marvelous properties. These include the ability to produce very, very short pulses of light which can be used for optical radar and remote time comparison.

Keywords

Quartz Microwave Mercury Platinum Covariance 

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References

  1. 1.
    C. O. Alley, Relativity and clocks, in “Proceedings, 33rd Annual Symposium on Frequency Control,” U. S. Army Electronics Research and Development Command, Fort Monmouth, N.J., pp 4–394 (1979). Copies available from Electronic Industries Association, 2001 Eye Street, N.W., Washington, D.C. 20006. This reference, a review talk given at the time of the Einstein Centennial is similar in approach to the present paper, but contains more detail on some aspects of the technique of the experiments and more biographical material on Einstein. The author’s chief collaborators in the planning and execution of the esqaeriments were Dr. Leonard Cutler of the Hewlett-Packard Company, and Dr. Gemot Winkler of the U. S. Naval Observatory. Two other physicists who contributed much to the experiments are former University of Maryland, graduate research students, Dr. Robert Reisse, now at the University of Arizona and Dr. Ralph Williams, now at the Texas Instruments Company. The work of another University of Maryland graduate student, Dr. John Degnan, now at the Goddard Space Flight Center, on the short pulse laser used in the measurements was very important. The local experiments were performed during the period May 1975 through January, 1976 at the Patuxent Naval Air Test Center in Maryland with the support of the U. S. Navy. The global experiments were performed during the period May through July, 1977 from the Andrews Air Force Base in the Maryland suburbs of Washington, D.C. and were jointly supported by the U.S. Air Force and Navy. Space does not permit the acknowledgment of the esential contributions made by the engineers and technicians at the University of Maryland, the Hewlett- Packard Co., and the U. S. Naval Observatory. These are listed in the reference cited above.Google Scholar
  2. 2.
    Banesh Hoffmann, “Albert Einstein, Creator and Rebel”, The Viking Press, New York (197 2). Paperback edition, New American Library, New York, London, and Scarborough, Ontario (1973). This is an excellent introduction to Einstein’s physics as well as a first-rate biography.Google Scholar
  3. 3.
    Hermann Bondi, “Relativity and Common Sense, A New Approach to Einstein,” Anchor Book Science Study Series, Doubleday and Company, Inc., Garden City, New York (1964). Reprinted by Dover Publications, Inc., New York (1980). The k-calculus is also discussed in another book by Bondi, “Assumption and Myth in Physical Theory,” Cambridge University Press (1967).Google Scholar
  4. 4.
    Hermann Minkowski, address to the 80th Assembly of German Natural Scientists and Physicians, Cologne, Germany, 21 September, 1908.Google Scholar
  5. 5.
    F. J. M. Farley, J. Bailey, and E. Picasso, Experimental verifications of the special theory of relativity,Nature, 217: 17 (1968).ADSCrossRefGoogle Scholar
  6. 6.
    R. V. Pound and G. A. Rebka, Apparent weight of photons,Phys. Rev. Lett., 4: 337 (1960).ADSCrossRefGoogle Scholar
  7. 7.
    A. Einstein, The fundamental idea of general relativity in its original form, excerpts printed inThe New York Times, March 28, 1972, p. 32.Google Scholar
  8. 8.
    P. G. Roll, R. Krotkov, and R. H. Dicke, The equivalence of inertial and passive gravitional mass,Ann. Phys. (U.S.A.) 26: 442 (1964).MathSciNetADSMATHCrossRefGoogle Scholar
  9. 9.
    V. B. Braginsky and V. I. Panov, Verification of the equivalence of inertial and gravitional mass,Zh. Eksp. & Teor. Fiz. 61:873 (1971). English translation inSov. Physics- JETP Lett. 10: 280 (1973).Google Scholar
  10. 10.
    J. G. Williams, R. H. Dicke, P. L. Bender, C.O.Alley, W. E. Carter, D. G. Currie, D. H. Eckhardt, J. E. Faller, W. M. Kaula, J. P. Mulholland, H. H. Plotkin, S. K. Poultney, P. J. Shelus, E. C. Silverberg, W. S. Sinclair, M. A. Slade, and D. T. Wilkinson, A new test of the equivalence principle from lunar laser ranging,Phys. Rev. Lett., 36:551 (1976). See also I. I. Shapiro, C. C. Counselman, III, and R. W. King, Verification of the principle of equivalence for massive bodies,Phys. Rev. Lett. 36:555 (1976). For a description of the lunar ranging experiment, see C. 0. Alley, Story of the development of the Apollo 11 laser ranging retro-reflector experiment,in “Adventures in Experimental Physics, ” Alpha: 128 (1972).Google Scholar
  11. 11.
    R. V. Pound and J. Snider, Effect of gravity on gamma radiation,Phys. Rev., 140:788. See also R. V. Pound, Terrestial measurements of the gravitational red shift,in “Albert Einstein’s Theory of General Relativity,” G. Tauber, ed., Crown Publishers, Inc., New York (1979).Google Scholar
  12. 12.
    J. Brault, The gravitational redshift in the solar spectrum, Ph. D. Thesis, Princeton University (1962). See alsoBull. Am. Phys. Soc., 8: 28 (1963).Google Scholar
  13. J. E. Blamont and F. Roddier, Precise observation of the profile of the Fraunhofer strontium line. Evidence for the gravitational redshift on the sun, Phys. Rev. Lett., 7:437 (1961). See also, F. Roddier, fitude a haute resolution de quelques raies de Fraunhofer par observation de la resonance optique d’un jet atomique, Annales d’ Astrophysique, 28 (3):463 (1965).ADSCrossRefGoogle Scholar
  14. 14.
    J. Snider, New Measurements of the solar gravitational redshift,Phys. Rev. Lett., 28: 853 (1972).ADSCrossRefGoogle Scholar
  15. 15.
    J. C. Hafele and R. E. Keating, Around-the-world atomic clocks: Predicted relativistic time gains,Science, 177:166 (1972); Around-the-world atomic clocks: Observed relativistic time gains,Science, 177; 168 (1972).Google Scholar
  16. 16.
    L. Briatore arid S. Leschiutta, Evidence for the earth gravitational shift by direct atomic-time-scale comparison,II Nuovo Cimento B, 37B (2): 219 (1979).Google Scholar
  17. 17.
    S. Iijima and K. Fujiwara, An experiment for the potential blue shift at the Norikura Corona Station,Annals of the Tokyo Astronomical Observatory, Second Series, Vol. XVII, Number 2: 68 (1978).ADSGoogle Scholar
  18. 18.
    R. F. C. Vessot and M. W. Levine, A test of the equivalence principle using a spaceborne clock,Gen. Relativ. Gray., 10: 181 (1979).ADSCrossRefGoogle Scholar
  19. 19.
    R. A. Reisse, The effect of gravitational potential on atomic clocks as observed with a laser pulse time transfer system, Ph.D. Thesis, University of Maryland (1976).Google Scholar
  20. 20.
    R. E. Williams, A direct measurement of the relativistic effects of gravitational potential on the rates of atomic clocks flown in an aircraft, Ph.D. Thesis, University of Maryland (1976).Google Scholar
  21. 21.
    M. Born, Physics and relativity,in “Physics in My Generation,” Pergamon Press, London and New York (1956). This was a lecture given at the International Relativity Conference in Berne, Switzerland, on 16th July, 1955. The remark about Stern and Gerlach is on p. 202. See also “The Born-Einstein Letters,” Irene Born, Trans., Walker and Company, New York (1971), commentary after Letter 13. Hie Frankfurt lectures by Born are available in English as “Einstein’s Theory of Relativity,” Dover Publications, Inc., New York (1962).Google Scholar
  22. 22.
    J. B. Thomas, Reformulation of the relativistic conversion between coordinate time and atomic time,Astronom. Journ., 80: 405 (1975).ADSCrossRefGoogle Scholar
  23. 23.
    Banesh Hoffmann, Noon-midnight red shift,Phys. Rev. 121: 337 (1961).MathSciNetADSCrossRefGoogle Scholar
  24. 24.
    R. U. Sexl, Seasonal differences between clocks, Phys. Lett., 6lB:65 (1976).Google Scholar
  25. 25.
    W. H. Cannon and O. G. Jensen, Terrestrial Timekeeping and general relativity: A new discovery,Science 188:317 (1975). The errors in this paper were pointed out by many authors in letters toScience which were published: Acceleration and clocks,Science 191: 489 (1976). The authors retracted their claims in a letter published with the others.Google Scholar
  26. 26.
    T. McCaskill, J. White, S. Stebbins, and J. Buisson, NTS-2 frequency stability results, “Proceedings, 32nd Annual Symposium, on Frequency Control,” U. S. Army Electronics Research and Development Command, Fort Monmouth, N.J. (1978). Copies available from Electronic Industries Association, 2001 Eye Street, N.W., Washington, D.C. 20006.Google Scholar
  27. 27.
    L. Brillouin, “Relativity Re-examined,” Academic Press, New York and London (1970). The first excerpt is on pp. 83 and 847 the second is on p. 40.Google Scholar

Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Carroll O. Alley
    • 1
  1. 1.Department of Physics and AstronomyUniversity of MarylandCollege ParkUSA

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