The Ising partition function is re-expressed as a complex-plane path integral with an auxiliary spin-constraint field, and a diagrammatic expansion is developed.
Mussardo, Statistical Field Theory: An Introduction to Exactly Solved Models in Statistical Physics, Oxford University Press, Oxford (2009)
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On a "continuum" formulation of the Ising model partition function
The Ising partition function is re-expressed as a complex-plane path integral with an auxiliary spin-constraint field, and a diagrammatic expansion is developed.