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Similar

M. Pate, A. M. Raclariu, A. Strominger and E. Y. Yuan, “Celestial Operator Products of Gluons and Gravitons,” arXiv:1910.07424 [hep-th]
Original
1910
Cited alongside, same era.
A. J. Macfarlane, “Relativistic Partial Wave Analysis,” Rev. Mod. Phys. 34
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1910
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H. Osborn, “Conformal Blocks for Arbitrary Spins in Two Dimensions,” Phys. Lett. B 718
Original
1941
Cited alongside, same era.
H. Joos, “On the Representation theory of inhomogeneous Lorentz groups as the foundation of quantum mechanical kinematics,” Fortsch. Phys. 10
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Cited alongside, same era.
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2003

Then

D. Kapec, P. Mitra, A. M. Raclariu and A. Strominger, “2D Stress Tensor for 4D Gravity,” Phys. Rev. Lett. 119
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2017
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H. T. Lam and S. H. Shao, “Conformal Basis, Optical Theorem, and the Bulk Point Singularity,” Phys. Rev. D 98
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2018
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N. Banerjee, S. Banerjee, S. Atul Bhatkar and S. Jain, “Conformal Structure of Massless Scalar Amplitudes Beyond Tree level,” JHEP 1804
Original
2018
Later among the works it cites.
A. Schreiber, A. Volovich and M. Zlotnikov, “Tree-level gluon amplitudes on the celestial sphere,” Phys. Lett. B 781
Original
2018
Later among the works it cites.
S. Stieberger and T. R. Taylor, “Strings on Celestial Sphere,” Nucl. Phys. B 935

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2019

Poincar\'e Constraints on Celestial Amplitudes

Law, Y. T. Albert, Zlotnikov, Michael

Understand

The functional structure of celestial amplitudes as constrained by Poincar\'e symmetry is investigated in $2,3,$ and $4$-point cases for massless external particles of various spin, as well as massive external scalars.

Functional constraints and recurrence relations are found (akin to the findings in arXiv:1901.01622) that must be obeyed by the respective permissible correlator structures and function coefficients.
In specific three-point cases involving massive scalars the resulting recurrence relations can be solved, e.g.
reproducing purely from symmetry a three-point function coefficient known in the literature.