Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The SAGEX Review on Scattering Amplitudes, Chapter 2: An Invitation to
  Color-Kinematics Duality and the Double Copy   Advances in scattering amplitudes have exposed previously-hidden
color-kinematics and double-copy structures in theories ranging from gauge and
gravity theories to effective field theories such as chiral perturbation theory
and the Born-Infeld model. These novel structures both simplify higher-order
calculations and pose tantalizing questions related to a unified framework
underlying relativistic quantum theories. This introductory mini-review article
invites further exploration of these topics. After a brief introduction to
color-kinematics duality and the double copy as they emerges at tree and
loop-level in gauge and gravity theories, we present two distinct examples: 1)
an introduction to the web of double-copy-constructible theories, and 2) a
discussion on the application of the double copy to calculation relevant to
gravitational-wave physics.

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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn