Einstein, Dirac, Wigner, Feynman

One hudred years ago, Einstein was interested in how things look to moving observers, while Bohr was worrying about why the hydogen energy levels are discrete. They are discrete because the electron orits are standing waves. Thus, there is a well-defined problem.

How would the standing waves look to moving observers?

Click here for the definition of the problem.


Many distinguished physicists worried about this problem. Among them were Dirac, Wigner, and Feynman.
Let us review their works and integrate them.


Three Wise Men from the 20th Century ?
Click here for a story

Three papers

Click here
for detailed references.
Dirac
  1. 1927. c-number time-energy uncertainty relation.
  2. 1945. Harmonic oscillators for the Lorentz group.
  3. 1949. Light-cone coordinate system.
Combine all three.
Wigner
  1. 1932. Wigner functions.
  2. 1939. Little group for internal space-time symmetries.
  3. 1953. Group contractions.
Combine 1. and 2. Combine 2. and 3.
Feynman
  1. 1969. Parton model.
  2. 1971. Harmonic oscillators.
  3. 1972. Rest of the universe.
Combine all three.


Major Contributions c-number time-energy uncertainty, harmonic oscillators, light-cone coordinate system. Little groups defining internal space-time symmetries. Parton model, oscillator model for Regge trajectories, in addition to Feynman diagrams.


Favorite language Poems. Dirac's writings are like poems. Two-by-two matrices. Diagrams and pictures.


Soft spots Lack of figures and illustrations. Lack of physical examples. Lack of concrete physical examples. His 1939 paper could not explain Maxwell's equations. Sloppy mathematics.


One Mathematics The mathematics of two coupled oscillators is well known. All of the above papers can be understood in terms of this mathematical instrument.



If we assemble these nine paper, we then end up with

Further Contents of Einstein's

E = mc2

  1. Click here for a story. Another story.

  2. Click here for the detailed references for the papers mentioned above.

Lorentz-covariant World
Massive/Slow between Massless/Fast
Energy Momentum E=p2/2m Einstein's
E=(m2 + p2)1/2
E=p
Spin,
Gauge, Helicity
S3
S1 S2
Wigner's
Little Group
S3
Gauge Trans.
Gell-Mann, Feynman Quark Model Lorentz-covariant
Oscillators
Partons


copyright@2012 by Y. S. Kim, unless otherwise specified. The Photo of Dirac by Bulent Atalay, and photo of Wigner by Y. S. Kim (1988). Feynman's photo is from the main lobby of the Feynman Computing Center at the Fermi National Accelerator Laboratory, Batavia, Illinois, USA.