Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A String Motivated Approach to the Relativistic Point Particle   Using concepts developed in string theory, Cohen, Moore, Nelson and
Polchinski calculated the propagator for a relativistic point particle.
Following these authors we extend the technique to include the case of closed
world lines. The partition function found corresponds to the Feynmann and
Schwinger proper time formalism. We also explicitly verify that the partition
function is equivalent to the usual path length action partition function. As
an example of a sum over closed world lines, we compute the Euler-Heisenberg
effective Lagrangian in a novel way.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ