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math-ph1998
Separable Four-dimensional Harmonic Oscillators and Representations of the Poincaré Group
Y. S. Kim
It is possible to construct representations of the Lorentz group using four-dimensional harmonic oscillators. This allows us to construct three-dimensional wave functions with the…
hep-ph1998
Lorentz Covariance and Internal Space-time Symmetry of Relativistic Extended Particles
Y. S. Kim
The difference between Lorentz invariance and Lorentz covariance is discussed in detail. A covariant formalism is developed for the internal space-time symmetry of extended particl…
hep-th1998
Wigner's Photons
Y. S. Kim
If Einstein's photon is , Wigner's photon is its helicity which is a Lorentz-invariant concept coming from the E(2)-like little group for massless particles. In ad…