BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//UM//UM*Events//EN
CALSCALE:GREGORIAN
BEGIN:VTIMEZONE
TZID:America/Detroit
TZURL:http://tzurl.org/zoneinfo/America/Detroit
X-LIC-LOCATION:America/Detroit
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20070311T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20071104T020000
RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20261004T100755
DTSTART;TZID=America/Detroit:20261005T160000
DTEND;TZID=America/Detroit:20261005T170000
SUMMARY:Workshop / Seminar:The ABCT Variety is a Positive Geometry
DESCRIPTION:The ABCT variety is the image closure of the rational Veronese map between Grassmannians. It was studied by Arkani-Hamed--Bourjaily--Cachazo--Trnka in the context of tree-level scattering amplitudes arising in planar \mathcal{N} = 4 supersymmetric Yang-Mills theory and Witten's twistor string theory. From this perspective\, the ABCT variety is conjectured to be a positive geometry by Lam. We study the combinatorial\, analytic\, and algebro-geometric aspects of the ABCT variety and its face stratification. We interpret the strata as certain point configurations on \mathbb{P}^2\, by the Gelfand-MacPherson correspondence. We construct the canonical forms on the ABCT variety and its strata\, and we show that they are positive geometries\, proving Lam's conjecture. No backgrounds in physics or positive geometry assumed.
UID:153239-21915490@events.umich.edu
URL:https://events.umich.edu/event/153239
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3866
CONTACT:
END:VEVENT
END:VCALENDAR