Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-08-25
Nucl.Phys.B457:375-407,1995
Physics
High Energy Physics
High Energy Physics - Theory
35 pages, latex, no figures, additional references; to be published in Nucl. Phys. B
Scientific paper
10.1016/0550-3213(95)00520-X
Path-integral expressions for one-particle propagators in scalar and fermionic field theories are derived, for arbitrary mass. This establishes a direct connection between field theory and specific classical point-particle models. The role of world-line reparametrization invariance of the classical action and the implementation of the corresponding BRST-symmetry in the quantum theory are discussed. The presence of classical world-line supersymmetry is shown to lead to an unwanted doubling of states for massive spin-1/2 particles. The origin of this phenomenon is traced to a `hidden' topological fermionic excitation. A different formulation of the pseudo-classical mechanics using a bosonic representation of $\gam_5$ is shown to remove these extra states at the expense of losing manifest supersymmetry.
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