# Searching for Kerr in the 2PM amplitude

@article{Aoude2022SearchingFK, title={Searching for Kerr in the 2PM amplitude}, author={Rafael Aoude and Kays Haddad and Andreas Helset}, journal={Journal of High Energy Physics}, year={2022} }

Abstract
The classical scattering of spinning objects is well described by the spinor-helicity formalism for heavy particles. Using these variables, we derive spurious-pole-free, all-spin opposite-helicity Compton amplitudes (factorizing on physical poles to the minimal, all-spin three-point amplitudes) in the classical limit for QED, QCD, and gravity. The cured amplitudes are subject to deformations by contact terms, the vast majority of whose contributions we can fix by imposing a relation…

## 17 Citations

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- 2022

: Eﬀects of massive object’s spin on massive-massless 2 → 2 classical scattering is studied. Focus is set on the less-considered dimensionless expansion parameter λ/b , where λ is the massless…

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### Classical spinning soft factors from gauge theory amplitudes

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In this short note, we analyse low energy electromagnetic radiation for spinning particles using the KMOC formalism [10] and the quantum soft theorems. In particular, we study low energy…

### NLO deflections for spinning particles and Kerr black holes

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We employ the “KMOC” formalism of [1] to compute classical momentum deflections of spinning bodies with arbitrary spin orientations up to next-to-leading order (one loop). We do this in…

### Classical Limit of Higher-Spin String Amplitudes

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: It has been shown that a special set of three-point amplitudes between two massive spinning states and a graviton reproduces the linearised stress-energy tensor for a Kerr black hole in the…

### Scattering Amplitudes and N-Body Post-Minkowskian Hamiltonians in General Relativity and Beyond

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- 2022

: We present a general framework for calculating post-Minskowskian, classical, conservative Hamiltonians for N non-spinning bodies in general relativity from relativistic scattering amplitudes. Novel…

### The ultrarelativistic limit of Kerr

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- 2022

The massless (or ultrarelativistic) limit of a Schwarzschild black hole with fixed energy was determined long ago in the form of the Aichelburg-Sexl shockwave, but the status of the same limit for a…

### Linear Response, Hamiltonian and Radiative Spinning Two-Body Dynamics

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- 2022

Using the spinning, supersymmetric Worldline Quantum Field Theory formalism we compute the momentum impulse and spin kick from a scattering of two spinning black holes or neutron stars up to…

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We study the process, within classical general relativity, in which an incident gravitational plane wave, of weak amplitude and long wavelength, scatters oﬀ a massive spinning compact object, such as…

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