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Auxiliary field : ウィキペディア英語版
Auxiliary field

In physics, and especially quantum field theory, an auxiliary field is one whose equations of motion admit a single solution. Therefore, the Lagrangian describing such a field A contains an algebraic quadratic term and an arbitrary linear term, while it contains no kinetic terms (derivatives of the field):
\mathcal_=\frac(A,A)+(f(\varphi),A).
The equation of motion for A is: A(\varphi)=-f(\varphi) and the Lagrangian becomes:
\mathcal_=-\frac(f(\varphi),f(\varphi)). Auxiliary fields do not propagate and hence the content of any theory remains unchanged by adding such fields by hand.
If we have an initial Lagrangian \mathcal_ describing a field \varphi then the Lagrangian describing both fields is:
\mathcal=\mathcal_(\varphi)+\mathcal_=\mathcal_(\varphi)-\frac(f(\varphi),f(\varphi)).
Therefore, auxiliary fields can be employed to cancel quadratic terms in \varphi in \mathcal_ and linearize the action \mathcal = \int.
Examples of auxiliary fields are the complex scalar field F in a chiral superfield, the real scalar field D in a vector superfield, the scalar field B in BRST and the field in the Hubbard-Stratonovich transformation.
The quantum mechanical effect of adding an auxiliary field is the same as the classical, since the path integral over such a field is Gaussian. To wit:
:\int_^\infty\!dA\, e^ A^2 + A f} = \sqrte^}.
== References ==

* Superspace, or One thousand and one lessons in supersymmetry (arXiv:hep-th/0108200 )


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