Perturbative gravity at null infinity
Perturbative gravity at null infinity
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DOI：
10.1088/0264-9381/31/22/225008
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发表时间：
2014-05
影响因子：
3.5
通讯作者：
T. Adamo;Eduardo Casali;David Skinner
中科院分区：
文献类型：
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作者：
T. Adamo;Eduardo Casali;David Skinner
我们描述了一个理论，生活在零共形边界我？>渐近平坦的时空，其状态编码（超）引力的辐射模式。我们研究了BMS群的诱导作用量，证明了在某些BMS超平移情况下的Ward恒等式与体中的温伯格软引力子定理是等价的.软引力子的次引导行为也可以从Barnich和Troessaert提出的扩展BMS代数中某些超旋生成元的Ward恒等式中得到。我们表明，该理论计算完整的经典引力S-矩阵，微扰周围的闵可夫斯基真空。
We describe a theory that lives on the null conformal boundary I ?> of asymptotically flat space-time, and whose states encode the radiative modes of (super)gravity. We study the induced action of the BMS group, verifying that the Ward identity for certain BMS supertranslations is equivalent to Weinbergʼs soft graviton theorem in the bulk. The subleading behaviour of soft gravitons may also be obtained from a Ward identity for certain superrotation generators in the extended BMS algebra proposed by Barnich and Troessaert. We show that the theory computes the complete classical gravitational S-matrix, perturbatively around the Minkowski vacuum.