Work

Log soft constraints on the Kosower-Maybee-O’Connell formalism

Year: 2026

Type: article

Abstract: The Kosower-Maybee-O’Connell (KMOC) formalism provides a systematic framework for extracting classical observables perturbatively from on-shell scattering amplitudes. In this work, we use this formalism to analyze electromagnetic infrared observables in four dimensions, focusing in particular on the linear memory and its tail contributions. Building on previous analysis of such observables using soft-photon theorems, we study the constraints implied by the logarithmic soft photon theorem on the corresponding soft radiation kernel. We show that demanding the expected nonperturbative properties of memory and tail effects imposes a nontrivial set of consistency conditions on the underlying S-matrix. We interpret these constraints as necessary consistency conditions, motivated by macroscopic causality, on the classical limit of the S-matrix as probed by inclusive observables.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/3p3j-rw7y

Authors: Siddhartha Paul, Adarsh Vishwakarma

Institutions: Homi Bhabha National Institute, Institute of Mathematical Sciences, Institute of Mathematical Sciences

Language: English

Topic: Black Holes and Theoretical Physics

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W7118310310

FWCI:

Cites: 57

Cited by:

Related to: