Design
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Key result
Soft theorems for on-shell scattering amplitudes depend solely on on-shell data and hold to all orders in perturbation theory, without dependence on unconstrained off-shell interactions.
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May streamline inflationary amplitude calculations; leaves open empirical tests beyond on-shell assumptions.
Key points are not available for this paper at this time.
Zong-Zhe Du (2025) studied this question. Soft theorems for on-shell scattering amplitudes depend solely on on-shell data and hold to all orders in perturbation theory, without dependence on unconstrained off-shell interactions.