Double Soft Theorems in Gauge and String Theories
arXiv:1504.05559
Abstract
We investigate the tree-level S-matrix in gauge theories and open superstring theory with several soft particles. We show that scattering amplitudes with two or three soft gluons of non-identical helicities behave universally in the limit, with multi-soft factors which are not the product of individual soft gluon factors. The results are obtained from the BCFW recursion relations in four dimensions, and further extended to arbitrary dimensions using the CHY formula. We also find new soft theorems for double soft limits of scalars and fermions in N=4 and pure N=2 SYM. Finally, we show that the double-soft-scalar theorems can be extended to open superstring theory without receiving any alpha' corrections.
22 pages, 5 figures; v2: 23 pages, 5 figures, corrected typos, updated references: matches the journal version
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Cited by in corpus (7)
- BMS, String Theory, and Soft Theorems
- Subsubleading soft theorems of gravitons and dilatons in the bosonic string
- On single and double soft behaviors in NLSM
- Double-soft behavior for scalars and gluons from string theory
- Double Soft Limit of Graviton Amplitude from the Cachazo-He-Yuan Formalism
- Multi-soft theorems in Gauge Theory from MHV Diagrams
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