BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Daniel Kapec (IAS Princeton) DTSTART:20211019T193000Z DTEND:20211019T204500Z DTSTAMP:20260423T024551Z UID:HET/17 DESCRIPTION:Title: Sha dows and Soft Exchange in Celestial CFT\nby Daniel Kapec (IAS Princeto n) as part of Purdue HET\n\n\nAbstract\nI will discuss exponentiated soft exchange in (d+2)-dimensional gauge and gravitational theories using the c elestial CFT formalism. These models exhibit spontaneously broken asymptot ic symmetries generated by gauge transformations with non-compact support\ , and the effective dynamics of the associated Goldstone “edge” mode i s expected to be d-dimensional. The introduction of an infrared regulator also explicitly breaks these symmetries so the edge mode in the regulated theory is really a d-dimensional pseudo-Goldstone boson. Symmetry consider ations determine the leading terms in the effective action\, whose coeffic ients are controlled by the infrared cutoff. Computations in this model re produce the abelian infrared divergences in d=2\, and capture the re-summe d (infrared finite) soft exchange in higher dimensions. The model also rep roduces the leading soft theorems in gauge and gravitational theories in a ll dimensions. Interestingly\, we find that it is the shadow transform of the Goldstone mode that has local d-dimensional dynamics: the effective ac tion expressed in terms of the Goldstone mode is non-local for d>2. The an alysis demonstrates that symmetry principles suffice to calculate soft exc hange in gauge theory and gravity.\n LOCATION:https://researchseminars.org/talk/HET/17/ END:VEVENT END:VCALENDAR