Analytic continuation of QFT observables to non-integer dimensions d develops branch cuts at integer d due to low-rank isomorphisms in the Lorentz group's representation theory.
Supersymmetric dimensional regularization via dimensional reduction
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Does QFT make sense in non-integer dimensions?
Analytic continuation of QFT observables to non-integer dimensions d develops branch cuts at integer d due to low-rank isomorphisms in the Lorentz group's representation theory.