Il Nuovo Cimento B (1971-1996)

, Volume 111, Issue 11, pp 1299–1313

Four-dimensional symmetry of taiji relativity and coordinate transformations based on a weaker postulate for the speed of light. - I


  • Leonardo Hsu
    • Physics DepartmentUniversity of California at Berkeley
  • Jong-Ping Hsu
    • Physics DepartmentUniversity of Massachusetts Dartmouth
  • Dominik A. Schneble
    • Physics DepartmentUniversity of Massachusetts Dartmouth

DOI: 10.1007/BF02742507

Cite this article as:
Hsu, L., Hsu, J. & Schneble, D.A. Nuov Cim B (1996) 111: 1299. doi:10.1007/BF02742507


The power of the four-dimensional symmetry of taiji relativity is demonstrated through an analysis of Edwards’ transformation based on the weaker postulate that only the two-way speed of light is a universal constant. His transformation, involving Reichenbach’s time, is shown to be inconsistent with Lorentz-group properties and the relativistic energy-momentum expression for particles. However, using the symmetry of taiji relativity as a guiding principle, we can obtain a new four-dimensional transformation which does not have these difficulties. We show that Reichenbach’s concept of time is compatible with the four-dimensional symmetry of physical laws. No known experiments can distinguish physical laws in this four-dimensional formalism («extended relativity») from those in special relativity.


03.30Special relativity


11.30.CpLorentz and Poincare invariance

Copyright information

© Società Italiana di Fisica 1996