New Soft Theorems for Goldstone-Boson Amplitudes
In this Letter we discuss new soft theorems for the Goldstone-boson amplitudes with nonvanishing soft limits. The standard argument is that the nonlinearly realized shift symmetry leads to the vanishing of scattering amplitudes in the soft limit, known as the Adler zero. This statement involves certain assumptions of the absence of cubic vertices and the absence of linear terms in the transformations of fields. For theories which fail to satisfy these conditions, we derive a new soft theorem which involves certain linear combinations of lower point amplitudes, generalizing the Adler zero statement. We provide an explicit example of the SU($$\textit{N}$$)/SU($$\textit{N}$$ – 1) sigma model which was also recently studied in the context of U(1) fibrated models. The soft theorem can be then used as an input into the modified soft recursion relations for the reconstruction of all tree-level amplitudes.
- Research Organization:
- Univ. of California, Davis, CA (United States); Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Czech Science Foundation (GACR); USDOE
- Grant/Contract Number:
- SC0009999; SC0011842
- OSTI ID:
- 1605321
- Alternate ID(s):
- OSTI ID: 1802009; OSTI ID: 1834295
- Journal Information:
- Physical Review Letters, Vol. 124, Issue 11; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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