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Using concepts developed in string theory, Cohen, Moore, Nelson andPolchinski calculated the propagator for a relativistic point particle.Following these authors we extend the technique to include the case of closedworld lines. The partition function found corresponds to the Feynmann andSchwinger proper time formalism. We also explicitly verify that the partitionfunction is equivalent to the usual path length action partition function. Asan example of a sum over closed world lines, we compute the Euler-Heisenbergeffective Lagrangian in a novel way.Comment: Talk at Balfest, Salerno 200

A String Motivated Approach to the Relativistic Point Particle