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Results tagged with field-theory
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user 171182
For questions where the dynamical variables are fields, that is, functions of several variables (typically, one time coordinate and several space coordinates). Comprises both classical field theory and quantum field theory. Use this tag when the question applies to both classical and quantum phenomena. Otherwise, use the specific tag instead.
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Correlation function calculation
From Mehran Kardar's Statistical Physics of Fields page 38 section 3.2
[...] $I_d(x,\xi)$ is the solution to the following differential equation
$ \nabla^2 I_d(x) = \delta^d(x)+ I_d(x)/\xi^2$
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