Perturbative soft graviton theorems in de Sitter spacetime

Abstract

We consider soft graviton scattering for a theory where Einstein's gravity is minimally coupled to a scalar field in the presence of a cosmological constant, i.e. in a background de Sitter space. Employing a perturbative expansion in a small cosmological constant, we compute leading, subleading and sub-subleading corrections to Weinberg's soft graviton amplitude for the tree-level scatterings in the static patch of de Sitter space. We observe similar universal features of the soft graviton amplitude as found in [JHEP10(2023)055] for the soft photons.

Affiliation corrected, published version in JHEP

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Cited by in corpus (1)

• de Sitter corrections to supertranslation Ward identity and soft graviton theorem