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2020

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

Himwich, Elizabeth, Narayanan, Sruthi A., Pate, Monica et al.

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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 Soft $\mathcal{S}$-Matrix in Gravity · Around

Built on

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