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arxiv 1712.04551 v1 pith:WKZVJXCP submitted 2017-12-12 hep-th gr-qc

BMS Supertranslation Symmetry Implies Faddeev-Kulish Amplitudes

classification hep-th gr-qc
keywords faddeev-kulishamplitudeschargestatescloudsconstructedhardinfrared
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We show explicitly that, among the scattering amplitudes constructed from eigenstates of the BMS supertranslation charge, the ones that conserve this charge, are equal to those constructed from Faddeev-Kulish states. Thus, Faddeev-Kulish states naturally arise as a consequence of the asymptotic symmetries of perturbative gravity and all charge conserving amplitudes are infrared finite. In the process we show an important feature of the Faddeev-Kulish clouds dressing the external hard particles: these clouds can be moved from the incoming states to the outgoing ones, and vice-versa, without changing the infrared finiteness properties of S matrix elements. We also apply our discussion to the problem of the decoherence of momentum configurations of hard particles due to soft boson effects.

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Cited by 5 Pith papers

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