期刊
CLASSICAL AND QUANTUM GRAVITY
卷 36, 期 20, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6382/ab42ce
关键词
scattering amplitudes; asymptotic symmetries; ambitwistor strings; soft theorems
类别
资金
- Imperial College Junior Research Fellowship
- Mathematical Institute Studentship, Oxford
- EPSRC [EP/M018911/1, EP/F016654/1] Funding Source: UKRI
Scattering amplitudes in d + 2 dimensions can be expressed in terms of a conformal basis, for which the S-matrix behaves as a CPT correlation function on the celestial d-sphere. We explain how compact expressions for the full tree-level S-matrix of gauge theory, gravity and other QFTs extend to this conformal basis, and arc easily derived from ambitwistor strings. Using these formulae and their worldsheet origins, we prove various tree-level 'conformal soft theorems' in gauge theory and gravity in any dimension; these arise from limits where the scaling dimension of an external state in the scattering process takes special values. These conformally soft limits are obscure from standard methods, but they are easily derived with ambitwistor strings. Additionally, we make an identification between the residues of confonnally soft vertex operator insertions in ambitwistor strings and charges generating asymptotic symmetries.
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