111 citations · 239 across the 12 of their papers we have counts for
13 papers
The classical limit of the Magnus expansion
Andreas Brandhuber, Graham R. Brown, Sebastien MacDonald +3
We uncover a connection between the classical limit of the Magnus expansion in quantum field theory and the Malvenuto-Reutenauer Hopf algebra of permutations. We study a cubic scal…
The Magnus expansion in relativistic quantum field theory
Andreas Brandhuber, Graham R. Brown, Paolo Pichini +2
We investigate the Magnus expansion of the -operator in relativistic quantum field theory, which is related to the -matrix via . We develop direct methods to comp…
Higher spin fields and the field strength multicopy
Graham R. Brown, Bill Spence
We discuss the generalisation of the Weyl double copy to higher spin "multi-copies", showing how the natural linearised higher spin field strengths can be related to sums of powers…
Unexpected Symmetries of Kerr Black Hole Scattering
Dogan Akpinar, Graham R. Brown, Riccardo Gonzo +1
Motivated by the recent introduction of the Dirac bracket framework to compute spinning observables for the scattering of Kerr black holes, we initiate the study of conserved quant…
Spinning quadrupoles in effective field theories of gravity
Andreas Brandhuber, Graham R. Brown, Gabriele Travaglini +1
We study the effect of the two independent parity-even cubic interactions and …
Spinning waveforms in cubic effective field theories of gravity
Andreas Brandhuber, Graham R. Brown, Gang Chen +2
We derive analytic all-order-in-spin expressions for the leading-order time-domain waveforms generated in the scattering of two Kerr black holes with arbitrary masses and spin vect…
Spinning binary dynamics in cubic effective field theories of gravity
Andreas Brandhuber, Graham R. Brown, Paolo Pichini +2
We study the binary dynamics of two Kerr black holes with arbitrary spin vectors in the presence of parity-even and parity-odd cubic deformations of gravity. We first derive the tr…
Resummed spinning waveforms from five-point amplitudes
Andreas Brandhuber, Graham R. Brown, Gang Chen +2
We compute the classical tree-level five-point amplitude for the two-to-two scattering of spinning celestial objects with the emission of a graviton. Using this five-point amplitud…
Self-Dual Fields on Self-Dual Backgrounds and the Double Copy
Graham R. Brown, Joshua Gowdy, Bill Spence
We explore the double copy for self-dual gauge and gravitational fields on self-dual background spacetimes. We consider backgrounds associated to solutions of the second Plebanski…
One-loop Gravitational Bremsstrahlung and Waveforms from a Heavy-Mass Effective Field Theory
Andreas Brandhuber, Graham R. Brown, Gang Chen +3
Using a heavy-mass effective field theory (HEFT), we study gravitational-wave emission in the scattering of two spinless black holes or neutron stars of arbitrary masses at next-to…
Celestial Twistor Amplitudes
Graham R. Brown, Joshua Gowdy, Bill Spence
We show how to formulate celestial twistor amplitudes in Yang-Mills (YM) and gravity. This is motivated by a refined holographic correspondence between the twistor transform and th…
Amplitudes, Hopf algebras and the colour-kinematics duality
Andreas Brandhuber, Graham R. Brown, Gang Chen +3
It was recently proposed that the kinematic algebra featuring in the colour-kinematics duality for scattering amplitudes in heavy-mass effective field theory (HEFT) and Yang-Mills…
Celestial Superamplitudes
Andreas Brandhuber, Graham R. Brown, Joshua Gowdy +2
We study celestial amplitudes in (super) Yang-Mills theory using a parameterisation of the spinor helicity variables where their overall phase is not fixed by the little group acti…