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Similar

S. Pasterski, S. H. Shao and A. Strominger, “Gluon Amplitudes as 2d Conformal Correlators,” Phys. Rev. D 96
Original
2017
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J. de Boer and S. N. Solodukhin, “A Holographic reduction of Minkowski space-time,” Nucl. Phys. B 665
Original
2017
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S. Pasterski and S. H. Shao, “Conformal basis for flat space amplitudes,” Phys. Rev. D 96
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2017
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C. Cardona and Y. t. Huang, “S-matrix singularities and CFT correlation functions,” JHEP 1708
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2017
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S. Caron-Huot, “Analyticity in Spin in Conformal Theories,” JHEP 1709
Original

Then

J. Murugan, D. Stanford and E. Witten, “More on Supersymmetric and 2d Analogs of the SYK Model,” JHEP 1708
Original
2017
Later among the works it cites.
M. Hogervorst and B. C. van Rees, “Crossing symmetry in alpha space,” JHEP 1711
Original
2017
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
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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.
L. Donnay, A. Puhm and A. Strominger, “Conformally Soft Photons and Gravitons,” JHEP 1901

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2019

Celestial Amplitudes: Conformal Partial Waves and Soft Limits

Nandan, Dhritiman, Schreiber, Anders, Volovich, Anastasia et al.

Understand

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.