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<p>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 <a href="https://link.springer.com/article/10.1007/JHEP10(2023)055"><i>JHEP</i> <b>10</b> (2023) 055</a> for the soft photons.</p>

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Perturbative soft graviton theorems in de Sitter spacetime

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  • 发表日期：

    2025年12月1日

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  • Divyesh N. Solanki,
  • Pratik Chattopadhyay,
  • Srijit Bhattacharjee

摘要

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 JHEP 10 (2023) 055 for the soft photons.