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Modified celestial amplitude in Einstein gravity
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DOI：10.1007/JHEP03(2020)125.png)
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Abstract
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In this paper we evaluate the modified celestial amplitude for gravitons and gluons, as defined in [4]. We find that the modified (tree) amplitude is finite for gravitons in Einstein gravity. The modified amplitude behaves like correlation function of operators inserted at various points of null-infinity in the Minkowski space-time. Therefore, unlike the standard celestial amplitudes, these are three dimensional objects. We also show that this amplitude admits conformal soft factorization recently studied in the literature.
Keywords:
Conformal Field Theory
Scattering Amplitudes
Space-Time Symmetries
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