From WOIT
" . . . As described in my earlier posting, this was the beginning of the huge area of topological quantum field theory, with early work by Witten following up on Atiyah's speculation. The structure of this TQFT looks very much like that of the Standard Model: it is a 4d theory with Yang-Mills gauge fields and fermions . . . "
https://www.math.columbia.edu/~woit/wordpress/?p=4727
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