The SAGEX Review on Scattering Amplitudes, Chapter 11: Soft Theorems and Celestial Amplitudes
arXiv:2203.13022 · doi:10.1088/1751-8121/ac9a40
Abstract
The soft limits of scattering amplitudes have been extensively studied due to their essential role in the computation of physical observables in collider physics. The universal factorisation that occurs in these kinematic limits has been shown to be related to conservation laws associated with asymptotic, or large, gauge symmetries. This connection has led to a deeper understanding of the symmetries of gauge and gravitational theories and to a reformulation of scattering amplitudes in a basis of boost eigenstates which makes manifest the two-dimensional global conformal symmetry of the celestial sphere. The recast, or celestial, amplitudes possess many of the properties of conformal field theory correlation functions which has suggested a path towards a holographic description of asymptotically flat spacetimes. In this review we consider these interconnected developments in our understanding of soft theorems, asymptotic symmetries and conformal field theory with a focus on the structure and symmetries of the celestial amplitudes and their holographic interpretation.
49 pages, 3 figures, see also the overview article arXiv:2203.13011
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Cited by in corpus (26)
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- From Celestial Correlators to AdS, and back
- Charge and Antipodal Matching across Spatial Infinity
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- Towards higher-spin holography in flat space
- Infinite -like symmetries of compactified LST
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- Constraining higher-spin S-matrices
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- A Carroll Limit of AdS/CFT: A Triality with Flat Space Holography?
- Diamond of Infrared Equivalences in Abelian Gauge Theories
- A Celestial Route to AdS Bulk Locality
- Celestial algebra in Einstein-Yang-Mills theory
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- Soft Theorems and Memory Effects at Finite Temperatures
- Entanglement Rényi entropies in celestial holography
- Celestial Eikonal Amplitudes in the Near-Horizon Region
- Flat Holography & Holographic Renormalization: Scalar Field
- Null infinity as a Killing horizon
- Double soft graviton factors from the gravitational Wilson line
- Residual Symmetries and Their Algebras in the Kerr-Schild Double Copy
- CFT reconstruction of local bulk operators in half-Minkowski space