BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Arun Debray (Purdue University)
DTSTART:20231024T180000Z
DTEND:20231024T195000Z
DTSTAMP:20260422T174255Z
UID:tandg/10
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/tandg/10/">C
 onstructing the Virasoro groups using differential cohomology</a>\nby Arun
  Debray (Purdue University) as part of Topology and Geometry Seminar (Texa
 s\, Kansas)\n\n\nAbstract\nAbstract: The Virasoro groups are a family of c
 entral extensions of ${\\rm Diff}^+(S^1)$ by the circle group $\\bf T$.\nI
 n this talk I will discuss recent work\, joint with Yu Leon Liu and Christ
 oph Weis\,\nconstructing these groups by beginning with a lift of the firs
 t Pontrjagin class to "off-diagonal" differential cohomology\,\nthen trans
 gressing it to obtain a central extension.\nAlong the way\, I will discuss
  what the Virasoro extensions are and how to recognize them\;\na brief int
 roduction to differential cohomology\; and lifts of characteristic classes
  to differential cohomology.\n
LOCATION:https://researchseminars.org/talk/tandg/10/
END:VEVENT
END:VCALENDAR