BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Andrea Campoleoni (U. Mons) DTSTART:20231108T150000Z DTEND:20231108T160000Z DTSTAMP:20260423T021126Z UID:AnLy/31 DESCRIPTION:Title: Fl at from anti-de Sitter\nby Andrea Campoleoni (U. Mons) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\nThe space of solutions of Einstein's equations is severely altered by the presence of a cosmologi cal constant. This is manifest when solving the equations of motion close to the boundary of spacetime. In AdS all information about the solutions i n encoded a metric and an energy-momentum tensor defined on the time-like boundary. On the other hand\, at null infinity the information about the s olutions is encoded in an infinite number of functions\, satisfying suitab le flux-balance laws. In spite of these striking differences\, we show how the space of Ricci-flat manifolds can be recovered from that of Einstein spaces by expanding the AdS boundary energy-momentum in powers of the cosm ological constant. In this process\, the flux-balance laws are also recove red by demanding that the line element remains finite in the limit of vani shing cosmological constant. The analysis is performed in a modified versi on of the Newman-Unti gauge\, that has the additional advantage of natural ly disclosing the Carrollian structures emerging at null infinity.\n LOCATION:https://researchseminars.org/talk/AnLy/31/ END:VEVENT END:VCALENDAR