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DTSTART;TZID=America/New_York:20260910T163000
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SUMMARY:Higher Virasoro algebras
DESCRIPTION:Geometry and Mathematical Physics Seminar \nSpeaker: Brian Williams\, Boston University \nTitle: Higher Virasoro algebras \nAbstract: I will introduce and classify central extensions of the dg Lie algebra of derived global sections of the tangent sheaf on the punctured d-disk for d > 1. Then\, I will formulate and sketch the proof of a formal and universal version of the Grothendieck–Riemann–Roch theorem. Time permitting I will discuss how to generalize this work to complements of other algebraic subvarities of affine space. This is joint work with Zhengping Gui.
URL:https://cmsa.fas.harvard.edu/event/dgphys_91026/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Geometry and Mathematical Physics Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Geometry-Math-Physics-Seminar-9.10.26-scaled.png
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DTSTAMP:20260922T145208Z
CREATED:20260729T160440Z
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UID:10003972-1790267400-1790271000@cmsa.fas.harvard.edu
SUMMARY:Why do Feynman integrals know Calabi-Yau geometry?  
DESCRIPTION:Geometry and Mathematical Physics Seminar \nSpeaker: Chuck Doran\, CMSA & University of Alberta \nTitle: Why do Feynman integrals know Calabi-Yau geometry? \nAbstract: Feynman integrals provide a rich source of Calabi-Yau geometry\, but the geometric origin of these structures is often obscure. I will describe a simple point of view that begins with two-dimensional examples and leads naturally to moduli problems for vectors and polyhedra in three dimensions. I will discuss recent results for tetrahedral moduli and some new phenomena for pentahedral geometry that point toward a broader geometric framework for the Calabi-Yau structures appearing in Feynman integrals. \n 
URL:https://cmsa.fas.harvard.edu/event/dgphys_92426/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Geometry and Mathematical Physics Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/2026/07/CMSA-Geometry-Math-Physics-Seminar-9.24.26.docx-scaled.png
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