Foundations of Physics

, Volume 19, Issue 12, pp 1525–1528 | Cite as

Response to Rodrigues and Rosa on the twin paradox

  • Mendel Sachs


This paper responds briefly to the criticism of Rodrigues and Rosa on my earlier analysis of the twin paradox. The main point that I have emphasized (and that the authors have not refuted, either logically or mathematically) is the error in directly identifying anabstract measure relative to a reference frame [and its transformations to all other possible reference frames in which the laws of nature are to be compared (such as temporal and spatial measures)], with aphysical extension and duration of a material body.


Reference Frame Early Analysis Material Body Spatial Measure Twin Paradox 
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  1. 1.
    W. A. Rodrigues and M. A. F. Rosa,Found. Phys. 19, 705 (1989).Google Scholar
  2. 2.
    M. Sachs,Phys. Today 24, 23 (1971);Einstein Versus Bohr (Open Court, LaSalle, Illinois, 1988), Chap. 9.Google Scholar
  3. 3.
    M. Sachs,Found. Phys. 15, 977 (1985).Google Scholar
  4. 4.
    A. Einstein, “Autobiographical Notes,” inAlbert Einstein—Philosopher-Scientist, P. A. Schilpp, ed. (Open Court, LaSalle, Illinois, 1970), p. 59.Google Scholar
  5. 5.
    A. Einstein,Sidelights of Relativity (E. P. Dutton, New York, 1922; Dover, New York, 1985), p. 35.Google Scholar
  6. 6.
    A. Einstein, Ref. (4). “Google Scholar
  7. 7.
    M. Sachs,General Relativity and Matter (Reidel, Dordrecht, 1982), Chaps. 3 and 6.Google Scholar
  8. 8.
    J. Terrelet al., Phys. Today 25, 9 (1972).Google Scholar

Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • Mendel Sachs
    • 1
  1. 1.Department of Physics and AstronomyState University of New York at BuffaloBuffalo

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