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created worldline formalism to go with this Physics.SE answer
added a little more to worldline formalism.
In particular I added mentioning of this old but curious fact, which I only just learned of from looking again at the review Schubert 96:
In (Metsaev-Tseytlin 88) the 1-loop beta function for pure Yang-Mills theory was obtained as the point-particle limit of the partition function of a bosonic open string in a Yang-Mills background field. This provided a theoretical explanation for the observation, made earlier in (Nepomechie 83) that when computed via dimensional regularization then this beta function coefficient of Yang-Mills theory vanishes in spacetime dimension 26. This of course is the critical dimension of the bosonic string.
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