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Single-minus graviton amplitudes

The earlier gluon calculation concerns Yang–Mills theory.

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Importance: notable
VerificationAuthor claimAccessible artifact / proof

AI-assisted recursion and formulas for single-minus graviton amplitudes

Guevara, Lupsasca, Skinner, Strominger and Weil report nonzero tree-level single-minus graviton amplitudes at half-collinear kinematics, solving a recursion as a sum over trees and obtaining a product of soft factors in a restricted decay region.

Read original source Original paper v2: single-minus graviton tree amplitudesarxiv.org

Original report: 2026-03-04

Understanding the problem

Read the background

The earlier gluon calculation concerns Yang–Mills theory. This paper derives the corresponding gravity recursion and solution; the generic-kinematics vanishing argument does not cover its special configurations.

Why it matters

Extends a special-kinematics amplitude calculation to gravity with a new recursion and general solution. This is a distinct gravity result related to the gluon paper.

What counts as progress

A sourced analytical result, substantive numerical advance, or useful calculation method with its physical model, approximation, baseline, and AI contribution stated.

What to watch for

  • Compare the same physical model, kinematic region, and approximation.
  • Applies in Klein space or with complexified momenta. The Ward-identity conclusion also needs analyticity assumptions. This is not a proof of quantum gravity or an experimental detection. AIProofWatch has not independently checked the argument.
  • Track independent checks and subsequent corrections separately from importance.

Background review: 2026-10-13. Selected sources:

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