Celestial Amplitudes: Conformal Partial Waves and Soft Limits
High Energy Physics - Theory
2019-10-23 v1
Abstract
Massless scattering amplitudes in four-dimensional Minkowski spacetime can be Mellin transformed to correlation functions on the celestial sphere at null infinity called celestial amplitudes. We study various properties of massless four-point scalar and gluon celestial amplitudes such as conformal partial wave decomposition, crossing relations and optical theorem. As a byproduct, we derive the analog of the single and double soft limits for all gluon celestial amplitudes.
Cite
@article{arxiv.1904.10940,
title = {Celestial Amplitudes: Conformal Partial Waves and Soft Limits},
author = {Dhritiman Nandan and Anders Schreiber and Anastasia Volovich and Michael Zlotnikov},
journal= {arXiv preprint arXiv:1904.10940},
year = {2019}
}
Comments
13 pages, 1 figure