SEMINAR : Interacting Fields at Spatial Infinity

Speaker: Athira P. V. (ICTS Bangalore)

Abstract: In this talk, I discuss the properties of massive fields extrapolated to the blowup of spatial infinity, by extending the program initiated in arXiv:2207.06406. We study interacting Wightman correlators and find that, generically, interacting massive fields decay slower than free fields as one approaches spatial infinity. We propose that meaningful correlators at spatial infinity can be obtained through an LSZ-like prescription that isolates the on-shell part of bulk Wightman correlators before extrapolating them. We show that a natural basis for operators at spatial infinity, defined via this prescription, is given by the average of in and out operators defined at timelike past and future infinities respectively.