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X-FROM-URL:https://eom.sdu.dk/events/ical/e8443f7f-deb7-4c76-82e3-97de12a2
 d956
X-WR-CALNAME:QM Research Seminar: Grothendieck- Teichmüller group and the 
 (Cyclic) Ribbon group operad
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TZID:Europe/Copenhagen
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DTSTART:20261028T030000
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DESCRIPTION:[b]Speaker: Chandan Singh[/b]\n(University of Melbourn)\n\n\n[
 b]Abstract:[/b]\nIn this talk\, we show that a groupoid model based on th
 e operad of\nparenthesized ribbons admits a cyclic structure. This extend
 s the action of\nGT from braids to ribbons\, thus providing a new charact
 erization of GT as\nan automorphism group of the prounipotent cyclic oper
 ad of parenthesized\nribbons. As a consequence\, we exploit this GT actio
 n to provide a simple\nproof of the formality of the cyclic-framed little
  disk operad. Finally\, this\naction extends to the category of parenthes
 ized tangles\, which verifies the\nconjecture of Kessel-Turaev about Galo
 is actions on framed tangles.\nThe work discussed here lays foundation to
  exploring GT actions on a\nbroader class of knotted objects such as B-ta
 ngles\, virtual tangles and\nwelded tangles\, which will be addressed in 
 our future work. This is a joint\nwork with Marcy Robertson.
DTEND:20250212T150000Z
DTSTAMP:20261007T214830Z
DTSTART:20250212T140000Z
LOCATION:Syddansk Universitet\, Campusvej 55\, 5230\, Odense M
SEQUENCE:0
SUMMARY:QM Research Seminar: Grothendieck- Teichmüller group and the (Cycl
 ic) Ribbon group operad
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