Searching for Kerr in the 2PM amplitude

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

Lense-Thirring effects from on-shell amplitudes

: 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

Conservative Binary Dynamics with a Spinning Black Hole at $\mathcal{O}(G^3)$ from Scattering Amplitudes

We compute the conservative two-body Hamiltonian of a compact binary system with a spinning black hole through O ( G 3 ) to all orders in velocity, including linear and quadratic spin terms. To

Classical spinning soft factors from gauge theory amplitudes

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

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

: 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

: 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

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

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

Scattering of gravitational waves off spinning compact objects with an effective worldline theory

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



From Scattering in Black Hole Backgrounds to Higher-Spin Amplitudes: Part I

The scattering of massless waves of helicity |h| = 0, 12 , 1 in Schwarzschild and Kerr backgrounds is revisited in the long-wavelenght regime. Using a novel description of such backgrounds in terms

Scattering of spinning black holes from exponentiated soft factors

Abstract We provide evidence that the classical scattering of two spinning black holes is controlled by the soft expansion of exchanged gravitons. We show how an exponentiation of

SUSY in the sky with gravitons

Picture yourself in the wave zone of a gravitational scattering event of two massive, spinning compact bodies (black holes, neutron stars or stars). We show that this system of genuine astrophysical

Holomorphic classical limit for spin effects in gravitational and electromagnetic scattering

  • A. Guevara
  • Physics
    Journal of High Energy Physics
  • 2019
A bstractWe provide universal expressions for the classical piece of the amplitude given by the graviton/photon exchange between massive particles of arbitrary spin, at both tree and one loop level.

Classical observables from coherent-spin amplitudes

Abstract The quantum field-theoretic approach to classical observables due to Kosower, Maybee and O’Connell provides a rigorous pathway from on-shell scattering amplitudes to classical perturbation

Compton black-hole scattering for s ≤ 5/2

Abstract Quantum scattering amplitudes for massive matter have received new attention in connection to classical calculations relevant to gravitational-wave physics. Amplitude methods and insights

Spin effects in the effective field theory approach to Post-Minkowskian conservative dynamics

Abstract Building upon the worldline effective field theory (EFT) formalism for spinning bodies developed for the Post-Newtonian regime, we generalize the EFT approach to Post-Minkowskian (PM)

The simplest massive S-matrix: from minimal coupling to black holes

A bstractIn this paper, we explore the physics of electromagnetically and gravitationally coupled massive higher spin states from the on-shell point of view. Starting with the three-point amplitude,

Tidal effects for spinning particles

Abstract Expanding on the recent derivation of tidal actions for scalar particles, we present here the action for a tidally deformed spin-1/2 particle. Focusing on operators containing two powers of

Soft matters, or the recursions with massive spinors

We discuss recursion relations for scattering amplitudes with massive particles of any spin. They are derived via a two-parameter shift of momenta, combining a BCFW-type spinor shift with the soft