Abstract
We use tools from conformal representation theory to classify the symmetries associated to conformally soft operators in celestial CFT (CCFT) in general dimensions d. The conformal multiplets in d > 2 take the form of celestial necklaces whose structure is much richer than the celestial diamonds in d = 2, it depends on whether d is even or odd and involves mixed-symmetric tensor representations of SO(d). The existence of primary descendants in CCFT multiplets corresponds to (higher derivative) conservation equations for conformally soft operators. We lay out a unified method for constructing the conserved charges associated to operators with primary descendants. In contrast to the infinite local symmetry enhancement in CCFT2, we find the soft symmetries in CCFTd>2 to be finite-dimensional. The conserved charges that follow directly from soft theorems are trivial in d > 2, while non trivial charges associated to (generalized) currents and stress tensor are obtained from the shadow transform of soft operators which we relate to (an analytic continuation of) a specific type of primary descendants. We aim at a pedagogical discussion synthesizing various results in the literature.
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Acknowledgments
We would like to thank Daniel Kapec, Alok Laddha and Prahar Mitra for useful discussions. AP and ET are supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 852386). The work of YP is supported by the PhD track fellowship of Ecole Polytechnique.
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Pano, Y., Puhm, A. & Trevisani, E. Symmetries in Celestial CFTd. J. High Energ. Phys. 2023, 76 (2023). https://doi.org/10.1007/JHEP07(2023)076
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DOI: https://doi.org/10.1007/JHEP07(2023)076