Enhanced soft limits in de Sitter space

Armstrong, C.; Lipstein, A.; Mei, J.

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.

Citation

Armstrong, C., Lipstein, A., & Mei, J. (2022). Enhanced soft limits in de Sitter space. Journal of High Energy Physics, 2022(12), Article 64. https://doi.org/10.1007/jhep12%282022%29064

• Journal Article Type: Article
• Acceptance Date: Nov 29, 2022
• Online Publication Date: Dec 13, 2022
• Publication Date: 2022-12
• Deposit Date: Dec 14, 2022
• Publicly Available Date: Mar 23, 2023
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2022
• Issue: 12
• Article Number: 64
• DOI: https://doi.org/10.1007/jhep12%282022%29064
• Public URL: https://durham-repository.worktribe.com/output/1185061
• Related Public URLs: https://arxiv.org/abs/2210.02285