  R. P. Feynman was quite fond of inventing new physics. It is shown that some
of his physical ideas can be supported by the mathematical instruments
available from the Lorentz group. As a consequence, it is possible to construct
a Lorentz-covariant picture of the parton model. It is shown first how the
Lorentz group can be used for studying the internal space-time symmetries of
relativistic particles. These symmetries are dictated by Wigner's little
groups, whose transformations leave the energy-momentum four-vector of a given
particle invariant. The symmetry of massive particles is like the
three-dimensional rotation group, while the symmetry of massless particles is
locally isomorphic to the two-dimensional Euclidean group. It is noted that the
E(2)-like symmetry of massless particles can be obtained as an
infinite-momentum and/or zero-mass limit of the O(3)-like little group for
massive particles. It is shown that the formalism can be extended to cover
relativistic particles with space-time extensions, such as heavy ions and
hadrons in the quark model. It is possible to construct representations of the
little group using harmonic oscillators, which Feynman et al. used for studying
relativistic extended hadrons. This oscillator formalism allows us to show that
Feynman's parton model is a Lorentz-boosted quark model. The formalism also
allows us to explain in detail Feynman's rest of the universe which is
contained in his parton picture.
