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McLoughlin, Tristan; Puhm, Andrea; Raclariu, Ana-Maria

The SAGEX review on scattering amplitudes chapter 11: soft theorems and celestial amplitudes. (English) Zbl 1520.81143

J. Phys. A, Math. Theor. 55, No. 44, Article ID 443012, 44 p. (2022).
Summary: 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 (CFT) 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 CFT with a focus on the structure and symmetries of the celestial amplitudes and their holographic interpretation.

Cited in 30 Documents

MSC:

81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory
81T60 Supersymmetric field theories in quantum mechanics
81T40 Two-dimensional field theories, conformal field theories, etc. in quantum mechanics
81T13 Yang-Mills and other gauge theories in quantum field theory
81T35 Correspondence, duality, holography (AdS/CFT, gauge/gravity, etc.)

Keywords:

amplitudes; gauge theory; gravity; holography
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References:

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