BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Sukruti Bansal (Chulangkorn University\, Bangkok) DTSTART:20210304T153000Z DTEND:20210304T163000Z DTSTAMP:20260423T041623Z UID:HEPTUW/18 DESCRIPTION:Title: Unimodular vs Nilpotent Superfield Approach to Pure dS Supergravity\nb y Sukruti Bansal (Chulangkorn University\, Bangkok) as part of HEP seminar s TU Wien (Vienna)\n\n\nAbstract\nRecent progress in understanding de Sitt er spacetime in supergravity and string theory has led to the development of a 4D supergravity with spontaneously broken supersymmetry allowing for de Sitter vacua\, also called de Sitter supergravity. One approach makes use of constrained (nilpotent) superfields\, while an alternative one coup les supergravity to a locally supersymmetric generalization of the Volkov- Akulov goldstino action. These two approaches have been shown to give rise to the same 4D action.\nA novel approach to de Sitter vacua in supergravi ty involves the generalisation of unimodular gravity to supergravity usin g a super-Stückelberg mechanism. We make a connection between this new ap proach and the previous two. We show that upon appropriate field redefinit ions\, the 4D actions match up to the cubic order in the fields. This poin ts at the possible existence of a more general framework to obtain de Sitt er spacetimes from high-energy theories.\n LOCATION:https://researchseminars.org/talk/HEPTUW/18/ END:VEVENT END:VCALENDAR