Singularity Structure of the Four Point Celestial Leaf Amplitudes

Raju Mandal; Sagnik Misra; Partha Paul; Baishali Roy

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arXiv · 2410.13969

Singularity Structure of the Four Point Celestial Leaf Amplitudes

Raju Mandal·Sagnik Misra·Partha Paul·Baishali Roy

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Abstract

In this paper, we study the four-point celestial leaf amplitudes of massless scalar and MHV gluon scattering. These leaf amplitudes are non-distributional decompositions of the celestial amplitudes associated with a hyperbolic foliation of the Klein spacetime. Bulk scale invariance imposes constraints on the total conformal weights of the massless scalars or gluons. Using this constraint we show that the four-point leaf amplitudes have a \textit {simple pole singularity at $ z = \bar z $}, where, $ z,\bar z $ are two real independent conformal cross ratios. The distributional nature of the four-point celestial amplitudes is recovered by adding the leaf amplitudes in the timelike and spacelike wedges of the spacetime. We also verify that the MHV gluon leaf amplitudes satisfy a set of differential equations previously obtained for celestial MHV gluon amplitudes by considering the soft gluon theorems and the subleading terms in the OPE expansion between two positive helicity gluons.

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Raju Mandal, Sagnik Misra, Partha Paul, Baishali Roy. 2024-10-17. Singularity Structure of the Four Point Celestial Leaf Amplitudes. https://arxiv.org/abs/2410.13969

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