Enhanced Soft Limits in de Sitter Space

Abstract

In flat space, the scattering amplitudes of certain scalar effective field theories exhibit enhanced soft limits due to the presence of hidden symmetries. In this paper, we show that this phenomenon extends to wavefunction coefficients in de Sitter space. Using a representation in terms of boundary conformal generators acting on contact diagrams, we find that imposing enhanced soft limits fixes the masses and four-point couplings (including curvature corrections) in agreement with Lagrangians recently derived from hidden symmetries. Higher-point couplings can then be fixed using a bootstrap procedure which we illustrate at six points. We also discuss implications for the double copy in de Sitter space.

v2. published in JHEP

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• Soft Limits of Gluon and Graviton Correlators in Anti-de Sitter Space
• Soft theorems in de Sitter spacetime
• Perturbative soft graviton theorems in de Sitter spacetime
• New Exceptional EFTs in de Sitter Space from Generalised Energy Conservation
• Soft unification of exceptional effective field theories in de Sitter space