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Hubbard Stratonovich transformation

  1. May 11, 2015 #1
    Introducing the Hubbard Stratonovich transformation my book uses an expression for completeness that I don't understand (the one indicated on the picture). Can anyone explain why this is indeed unity?
     

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  3. May 11, 2015 #2

    fzero

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    The normalization constant that they refer to being absorbed into the definition of the functional measure is presumably the appropriate power of ##\det V## and other factors that makes that unity. Overall rescalings of the functional measure should drop out of calculations of observables.
     
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