Gravitational Dyonic Amplitude at One-Loop and its Inconsistency with the Classical Impulse

TL;DR

This paper investigates the one-loop gravitational scattering amplitudes involving NUT charge, revealing inconsistencies with classical geodesic predictions and exploring the quantum field theory implications of NUT-charged objects.

Contribution

It extends the analysis of gravitational amplitude duality to one-loop order and uncovers discrepancies with classical motion, linking tidal responses to resonance phenomena.

Findings

Disagreement between geodesic motion and amplitude-based impulse calculations.

Identification of a relation between tidal response and resonance excitation parameters.

Extension of duality concepts to one-loop gravitational scattering amplitudes.

Abstract

The recent proposal [1911.06318, 2010.07861] of implementing electric-magnetic duality rotation at the level of perturbative scattering amplitudes and its generalisation to gravitational context where usual gravitational mass is rotated to the NUT parameter of the Taub-NUT spacetime opens up an interesting avenue for studying NUT-charged objects as dynamical entities, in contrast to the usual approach where NUT-charged objects are considered as a static background. We extend the tree-order analysis to one-loop order and find a disagreement between geodesic motion on Taub-NUT background and impulse computation of scattering amplitudes. As a by-product of our analysis, we find a relation between tidal response parameters and resonance excitation parameters in the language of quantum field theory scattering amplitudes.