Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effective hyper-K"ahler potential in the N=2 supersymmetric QCD   The effective low-energy hyper-K"ahler potential for a massive N=2 matter in
the N=2 super-QCD is investigated. The N=2 extended supersymmetry severely
restricts that N=2 matter self-couplings so that their exact form can be fixed
by a few parameters, which is apparent in the N=2 harmonic superspace. In the
N=2 QED with a single matter hypermultiplet, the one-loop perturbative
calculations lead to the Taub-NUT hyper-K"ahler metric in the massive case, and
a free metric in the massless case. It is remarkable that the naive
non-renormalization `theorem' does not apply. There exists a manifestly N=2
supersymmetric duality transformation converting the low-energy effective
action for the N=2 QED hypermultiplet into a sum of the quadratic and the
improved (non-polynomial) actions for an N=2 tensor multiplet. The duality
transformation also gives a simple connection between the low-energy effective
action in the N=2 harmonic superspace and the component results.

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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys