Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On The Uniqueness of Minimal Coupling in Higher-Spin Gauge Theory   We address the uniqueness of the minimal couplings between higher-spin fields
and gravity. These couplings are cubic vertices built from gauge non-invariant
connections that induce non-abelian deformations of the gauge algebra. We show
that Fradkin-Vasiliev's cubic 2-s-s vertex, which contains up to 2s-2
derivatives dressed by a cosmological constant $\Lambda$, has a limit where:
{(i)} $\Lambda\to 0$; {(ii)} the spin-2 Weyl tensor scales
{\emph{non-uniformly}} with s; and {(iii)} all lower-derivative couplings are
scaled away. For s=3 the limit yields the unique non-abelian spin 2-3-3 vertex
found recently by two of the authors, thereby proving the \emph{uniqueness} of
the corresponding FV vertex. We extend the analysis to s=4 and a class of spin
1-s-s vertices. The non-universality of the flat limit high-lightens not only
the problematic aspects of higher-spin interactions with $\Lambda=0$ but also
the strongly coupled nature of the derivative expansion of the fully nonlinear
higher-spin field equations with $\L\neq 0$, wherein the standard minimal
couplings mediated via the Lorentz connection are \emph{subleading} at energy
scales $\sqrt{|\Lambda|}<< E<< M_{\rm p}$. Finally, combining our results with
those obtained by Metsaev, we give the complete list of \emph{all} the
manifestly covariant cubic couplings of the form 1-s-s and 2-s-s, in Minkowski
background.

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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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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: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: eess