Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Computing numerically the functional derivative of an effective action   The functional derivative of the effective action with respect to an external
field is part of the equation of motion of this field if one-loop effects
induced by quantum fluctuations or thermal fluctuations are included when
minimizing the action of this field. Examples occur in all field theories
displaying classical solutions or - as in the Nambu-Jona-Lasinio model - self
consistent field configurations. We describe here a numerical method for
computing such functional derivatives; we use a fermion field with Yukawa
interaction to an external field as an example which is sufficiently simple and
sufficiently general. We compare the computed functional derivative to
analytical estimates.

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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin