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Amplitudes, Observables, and Classical Scattering

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26 Pith papers citing it
456 external citations · Pith
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abstract

We present a formalism for computing classically measurable quantities directly from on-shell quantum scattering amplitudes. We discuss the ingredients needed for obtaining the classical result, and show how to set up the calculation to derive the result efficiently. We do this without specializing to a specific theory. We study in detail two examples in electrodynamics: the momentum transfer in spinless scattering to next-to-leading order, and the momentum radiated to leading order.

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representative citing papers

Binary black hole scattering with generic spins

gr-qc · 2026-06-23 · unverdicted · novelty 8.0

First NR-PM comparison for generic-spin black hole scattering reveals strong-field precessional turning-point structure with polar-angle sign change absent from perturbative PM.

How traversable is a traversable wormhole?

hep-th · 2026-06-10 · unverdicted · novelty 7.0

Low-frequency scattering calculations show scalar probes through the MMP wormhole are mostly reflected or trapped at early times with late leakage to half the black-hole cross-section, while charged massless fermions transmit with unit probability via a Callan-Rubakov-like channel.

Resumming Scattering Amplitudes for Waveforms

hep-th · 2026-01-13 · unverdicted · novelty 7.0

A new projector-based formalism determines effective potentials from perturbative amplitudes and resums them to compute non-perturbative gravitational waveforms for generic two-body trajectories.

Resummation of Universal Tails in Gravitational Waveforms

hep-th · 2025-04-10 · unverdicted · novelty 7.0

A universal anomalous dimension for multipole moments in GR is derived via two EFT methods and applied to resum short-distance logarithmic tails in binary gravitational waveforms.

The Classical Gravitational Impulse at High Energies

hep-th · 2026-05-18 · unverdicted · novelty 6.0

The gravitational impulse for ultrarelativistic massive scalars is resummed to all orders in G_N at fixed G_N s/mb, recovering post-Minkowski results and predicting the leading high-energy behavior to eleventh post-Minkowski order.

Hawking Radiation meets the Double Copy

hep-th · 2025-10-29 · unverdicted · novelty 6.0

Bogoliubov coefficients from scattering a scalar in a collapsing EM background (single copy of Vaidya) match ray-tracing results and connect to Hawking radiation through the double copy.

Loops Outside a Black Hole

hep-th · 2025-09-03 · conditional · novelty 6.0

Conjecture reducing bulk loop discontinuity integrals in black hole Schwinger-Keldysh geometry to exterior real-time finite-temperature loop integrals, checked at one to three loops for low-point functions.

Unexpected Symmetries of Kerr Black Hole Scattering

hep-th · 2025-08-14 · unverdicted · novelty 6.0

The work establishes conservation of several quantities in Kerr black hole scattering and presents evidence that a spinning probe satisfies asymptotic integrability to quartic spin order at all post-Minkowskian orders.

Positivity in Amplitudes and Quantum Entanglement

hep-th · 2024-02-26 · unverdicted · novelty 6.0

Links amplitude positivity to S-matrix entanglement consistency for flavored states, analyzes disentanglers, and introduces wave-packet regularization for entanglement expressions.

Gravitational multipoles from scattering amplitudes in higher dimensions

hep-th · 2026-05-06 · unverdicted · novelty 6.0

In five dimensions, minimally coupled massive vector and antisymmetric tensor fields produce only mass or stress quadrupoles respectively from scattering amplitudes, failing to match the Myers-Perry black hole and demonstrating breakdown of spin universality.

Weak-field waveforms for generic relativistic orbits

hep-th · 2026-06-09 · unverdicted · novelty 5.0

Outlines a Schwinger-Keldysh path-integral framework that derives worldline equations of motion and computes weak-field gravitational waveforms independently for unspecified relativistic orbits.

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Showing 26 of 26 citing papers.