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Soft theorems in de Sitter spacetime
In this paper, we derive a soft photon theorem and a soft gluon theorem in
the de Sitter spacetime from the Ward identity of the near cosmological horizon
large gauge transformation. Taking the flat limit of the de Sitter spacetime,
the soft theorems naturally recover the corresponding flat spacetime soft
theorems.Comment: 18 pages, 1 figur
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