BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Edgar Gasperin (CENTRA\, IST) DTSTART:20200917T133000Z DTEND:20200917T143000Z DTSTAMP:20260423T052808Z UID:CENTRA/14 DESCRIPTION:Title: Zero rest-mass fields in Minkowski spacetime close to spatial infinity \nby Edgar Gasperin (CENTRA\, IST) as part of CENTRA Seminar\n\n\nAbstract \nZero rest-mass fields of spin 1 (the electromagnetic field) and spin 2 p ropagating on flat space and their corresponding Newman-Penrose (NP) const ants are studied near spatial infinity. The aim of this analysis is to cla rify the correspondence between data for these fields on a spacelike hyper surface and the value of their corresponding NP constants at future and pa st null infinity. To do so\, the framework of the cylinder at spatial infi nity is employed to show that\, expanding the initial data in terms spheri cal harmonics and powers of the geodesic spatial distance ρ to spatial in finity\, the NP constants correspond to the data for the second highest po ssible spherical harmonic at fixed order in ρ. In addition\, it is shown that for generic initial data within the class considered in this article\ , the NP constants at future and past null infinity\, for both the Maxwell and spin-2 field\, do not correspond to each other. However\, if the init ial data is time-symmetric\, then\, a correspondence between the NP consta nts at future and past null infinity is established.\n LOCATION:https://researchseminars.org/talk/CENTRA/14/ END:VEVENT END:VCALENDAR