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- W4282029222 abstract "Celestial amplitudes, obtained by applying Mellin transform and analytic continuation on ordinary amplitudes, have interesting properties which may provide useful insights on the underlying theory. Their analytic structures are thus of great interest and need to be better understood. In this paper, we critically examine the analytic structure of celestial amplitudes in a massless low-energy effective field theory. We find that, fixed-order loop contributions, which generate multipoles on the negative $beta$-plane, in general do not provide an accurate description of the analytic structure of celestial amplitudes. By resumming over the leading logarithmic contributions using renormalization group equations (RGEs), we observe much richer analytic structures, which generally contain branch cuts. It is also possible to generate multipoles or shifted single poles if the RGEs satisfy certain relations. Including sub-leading logarithmic contributions is expected to introduce additional corrections to the picture. However, without a new approach, it is difficult to make a general statement since the analytic form of the Mellin transform is challenging to obtain." @default.
- W4282029222 created "2022-06-13" @default.
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- W4282029222 date "2022-08-25" @default.
- W4282029222 modified "2023-09-26" @default.
- W4282029222 title "A note on the analytic structure of celestial amplitudes" @default.
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- W4282029222 doi "https://doi.org/10.1007/jhep08(2022)257" @default.
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