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arXiv 2005.13433hep-th
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引力中的软$\mathcal{S}$ -矩阵

The Soft $\mathcal{S}$-Matrix in Gravity

Elizabeth Himwich, Sruthi A. Narayanan, Monica Pate, Nisarga Paul, Andrew Strominger

摘要:

引力$\mathcal{S}$ -矩阵定义与红外(IR)截止因子分解成硬和软因素。软因子是普适的,包含了所有的IR发散和共线发散。在这里,我们表明,在动量空间的基础上,复杂的表达的软因素是完全再现的两个边界电流,这是生活在天球。第一个是超平移电流,它产生时空超平移。第二个是它的辛伙伴,自发破缺超平移的戈德斯通流。目前的代数有一个非对角的水平结构,涉及的引力尖点异常维数和对数的IR截止。它进一步表明,引力记忆效应包含作为一个IR安全观察内的软$\mathcal{S}$矩阵。

英文摘要:

The gravitational $\mathcal{S}$-matrix defined with an infrared (IR) cutoff factorizes into hard and soft factors. The soft factor is universal and contains all the IR and collinear divergences. Here we show, in a momentum space basis, that the intricate expression for the soft factor is fully reproduced by two boundary currents, which live on the celestial sphere. The first of these is the supertranslation current, which generates spacetime supertranslations. The second is its symplectic partner, the Goldstone current for spontaneously broken supertranslations. The current algebra has an off-diagonal level structure involving the gravitational cusp anomalous dimension and the logarithm of the IR cutoff. It is further shown that the gravitational memory effect is contained as an IR safe observable within the soft $\mathcal{S}$-matrix.

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