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.
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ArXiv ePrint: 1904.10940
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Nandan, D., Schreiber, A., Volovich, A. et al. Celestial amplitudes: conformal partial waves and soft limits. J. High Energ. Phys. 2019, 18 (2019). https://doi.org/10.1007/JHEP10(2019)018
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DOI: https://doi.org/10.1007/JHEP10(2019)018