https://en.wikipedia.org/wiki/Functional_determinant … > This path integral is only well defined up to some divergent multiplicative constant. >> divergent multiplicative constant Okeeey. QFT things
Let D be a differential operator and let ψ & ψ̅ be anti-commuting Dirac spinors
∫ d⁴x ψ̅Dψ is called the Classical Action
The functional determinant of D can be written as the Feynman path integral over all field configurations of ψ & ψ̅ weighted by the classical actionpic.twitter.com/yP4FGaIEcF
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