In theoretical physics, background field method is a useful procedure to calculate the effective action of a quantum field theory by expanding a quantum field around a classical "background" value B: ϕ ( x ) = B ( x ) + η ( x ) {\displaystyle \phi (x)=B(x)+\eta (x)} . After this is done, the Green's functions are evaluated as a function of the background.
In theoretical physics, background field method is a useful procedure to calculate the effective action of a quantum field theory by expanding a quantum field around a classical "background" value B: ϕ ( x ) = B ( x ) + η ( x ) {\displaystyle \phi (x)=B(x)+\eta (x)} . After this is done, the Green's functions are evaluated as a function of the background.
Source: Wikipedia "Background field method" · CC BY-SA 4.0
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