BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Marc Geiller DTSTART:20220315T130000Z DTEND:20220315T134000Z DTSTAMP:20260423T004549Z UID:PhysBound/4 DESCRIPTION:Title: The partial Bondi gauge\nby Marc Geiller as part of Physics @ Bounda ries Workshop\n\n\nAbstract\nI will present an analysis of 4d gravity in a partial Bondi gauge\, where only three conditions instead of the usual fo ur are imposed on the metric. The so-called determinant condition usually imposed on the angular metric is in particular dropped. This partial gauge still enables to construct a solution space\, which can accommodate an ar bitrary cosmological constant\, boundary sources\, the ''trace of the shea r''\, and polyhomogeneous terms. After presenting this solution space I wi ll discuss the asymptotic symmetries. The partial gauge is in particular a dapted to treating in a unified manner and contrasting the celebrated Bond i-Sachs gauge\, and the Newman-Unti gauge\, which we find to be inequivale nt. This latter does indeed enable to access a new asymptotic symmetry. Th is construction generalizes previous work in 3d gravity\, which I will als o present as further motivation for the 4d extension.\n LOCATION:https://researchseminars.org/talk/PhysBound/4/ END:VEVENT END:VCALENDAR