标题： de Sitter时空中的线性化引力与软引力子定理 显示英文标题

标题： Linearized gravity and soft graviton theorem in de Sitter spacetime

摘要： 我们研究了de Sitter时空视界邻近区域中Newman-Unti规范下的线性化引力理论。 线性化的爱因斯坦方程涉及宇宙学常数。 视界邻近对称性由视界超平移和视界超旋转组成。 我们计算了视界超平移荷，并找到了适当的视界衰减条件，从而从视界超平移的Ward恒等式中揭示了一个软引力子定理。 显示英文摘要

摘要： We study the linearized gravity theory in the Newman-Unti gauge in the near horizon region of the de Sitter spacetime. The linearized Einstein equation involves the cosmological constant. The near horizon symmetry consists of near horizon supertranslation and near horizon superrotation. We compute the near horizon supertranslation charge and find the proper near horizon fall-off conditions which uncover a soft graviton theorem from the Ward identity of the near horizon supertranslation.