Soft theorems in de Sitter spacetime
Pujian Mao, Kai-Yu Zhang
TL;DR
This paper derives soft photon and gluon theorems in de Sitter spacetime from gauge symmetries at the horizon, and shows they reduce to flat spacetime results in the flat limit.
Contribution
It introduces a derivation of soft theorems in de Sitter spacetime using horizon gauge transformations, extending flat spacetime soft theorems to curved backgrounds.
Findings
Soft theorems are derived in de Sitter spacetime from horizon gauge symmetries.
The de Sitter soft theorems reduce to flat spacetime theorems in the flat limit.
The approach connects gauge symmetries at the horizon to observable soft theorems.
Abstract
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.
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Taxonomy
TopicsBlack Holes and Theoretical Physics · Cosmology and Gravitation Theories · Particle physics theoretical and experimental studies