Gluon helicity flip in a plane wave background

Self Cite

We consider radiation emitted by colour-charged and massive particles crossing strong plane wave backgrounds in gauge theory and gravity. These backgrounds are treated exactly and non-perturbatively throughout. We compute the back-reaction on these fields from the radiation emitted by the probe particles: classically through background-coupled worldline theories, and at tree-level in the quantum theory through three-point amplitudes. Consistency of these two methods is established explicitly. We show that the gauge theory and gravity amplitudes are related by the double copy for amplitudes on plane wave backgrounds. Finally, we demonstrate that in four-dimensions these calculations can be carried out with a background-dressed version of the massive spinor-helicity formalism.

Section: Four-dimensions and Spinor Helicitymentioning

confidence: 99%

“…Such quantities are universal for three-point amplitudes on plane wave backgrounds (cf., [46,62,63]).…”

Section: Gluon Emission Amplitudementioning

confidence: 99%

“…where e is the charge of the particle with respect to the background. In the massless case (k 2 = 0 = K 2 ), it was shown [63] that 8) with the dressed spinors given by…”

Section: Jhep09(2020)200mentioning

confidence: 99%

Section: D Non-linear Compton Amplitudesmentioning

confidence: 99%

Section: Future Directionsmentioning

confidence: 99%

See 3 more Smart Citations

Classical and quantum double copy of back-reaction

Adamo

Ilderton

2020

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The analytic structure of amplitudes on backgrounds from gauge invariance and the infra-red

Ilderton

MacLeod

2020

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Gauge invariance and soft limits can be enough to determine the analytic structure of scattering amplitudes in certain theories. This prompts the question of how gauge invariance is connected to analytic structure in more general theories. Here we focus on QED in background plane waves. We show that imposing gauge invariance introduces new virtuality poles into internal momenta on which amplitudes factorise into a series of terms. Each term is gauge invariant, has a different analytic structure in external momenta, and exhibits a hard/soft factorisation. The introduced poles are dictated by infra-red behaviour, which allows us to extend our results to scalar Yukawa theory. The background is treated non-perturbatively throughout.in which D is the tensor structure of the photon propagator in some gauge, v is the

The classical double copy in curved spacetimes: perturbative Yang-Mills from the bi-adjoint scalar

Prabhu

2024

We formulate a version of the double copy for classical fields in curved spacetimes. We provide a correspondence between perturbative solutions to the bi-adjoint scalar equations and those of the Yang-Mills equations in position space. At the linear level, we show that there exists a map between these solutions for maximally symmetric spacetime backgrounds, that provides every Yang-Mills solution by the action of an appropriate differential operator on a bi-adjoint scalar solution. Given the existence of a linearized map, we show that it is possible to cast the solutions of the Yang-Mills equations at arbitrary perturbation order in terms of the corresponding bi-adjoint scalar solutions. This all-order map is reminiscent of the flat space BCJ double copy, and works for any curved spacetime where the perturbative expansion holds. We show that these results have the right flat space limit, and that the correspondence is agnostic to the choice of gauge.