Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Progress on Holographic Three-Point Functions   The recently developed gauge-invariant formalism for the treatment of
fluctuations in holographic renormalization group (RG) flows overcomes most of
the previously encountered technical difficulties. I summarize the formalism
and present its application to the GPPZ flow, where scattering amplitudes
between glueball states have been calculated and a set of selection rules been
found.

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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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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: cs
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph