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I am a PhD student in classical gravity; specifically in BH perturbation and GW. I am interested in learning about the double copy and the use of scattering amplitudes in understanding GW physics. I have taken QFT courses before, and I am familiar with path integral methods.

How should I go about learning double copy theory?

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    $\begingroup$ This may get you going: "The double copy was first observed in string theory. In the mid-1980s it was found [2] that closed string tree amplitudes could be written as sums of products of open string amplitudes. This is a non-trivial manifestation, at the level of physical observables, of the factorization of closed string states into products of left- and right- moving open string states. The low-energy limit of the string-theory double copy is the field-theory double copy exemplified in (1.1)." $\endgroup$
    – bolbteppa
    Commented Jun 27 at 15:44
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    $\begingroup$ This review: arxiv.org/abs/1909.01358, is excellent $\endgroup$
    – Akoben
    Commented Jun 27 at 17:03
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    $\begingroup$ Questions about prerequisites are often off-topic because they are opinion-based. I suggest asking only for references instead $\endgroup$
    – Níckolas Alves
    Commented Jun 27 at 17:46

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