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DTSTART;TZID=America/New_York:20260406T150000
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DTSTAMP:20260510T164349
CREATED:20260224T161017Z
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SUMMARY:Twistorial constructions of higher genus integrability
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Seraphim Jarov\, Perimeter Institute \nTitle: Twistorial constructions of higher genus integrability \nAbstract: I will present a new method to engineer integrable models in 4d with higher genus spectral parameters. The method has a twistorial origin – by working on a branched covering of twistor space\, I show how one can derive deformations of holomorphic BF theory on twistor space which descend to elliptic and hyperelliptic models on R^4 via the Penrose transform. I show how one can bootstrap the Penrose transformed actions using symmetry and integrability to find deformations of self-dual Yang-Mills theory. I will also discuss some novel deformations of a BF type description of Hitchin’s equations. This is based on my paper: 2509.12486
URL:https://cmsa.fas.harvard.edu/event/qft_4626/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Field Theory and Physical Mathematics
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QFT-and-Physical-Mathematics-4.6.26.docx.png
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DTSTART;TZID=America/New_York:20260420T150000
DTEND;TZID=America/New_York:20260420T160000
DTSTAMP:20260510T164349
CREATED:20260210T203936Z
LAST-MODIFIED:20260420T142242Z
UID:10003899-1776697200-1776700800@cmsa.fas.harvard.edu
SUMMARY:Zigzags\, adjoints\, and bordisms
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Lorenzo Riva (Harvard CMSA) \nTitle: Zigzags\, adjoints\, and bordisms \nAbstract: We will learn how to freely add adjoints to a category using a combinatorial procedure which involves drawing zigzags of squares. Peculiarly\, we can use these to draw some bordisms. This is joint work with Martina Rovelli.
URL:https://cmsa.fas.harvard.edu/event/qft_4202026/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Field Theory and Physical Mathematics
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QFT-and-Physical-Mathematics-4.20.26-scaled.png
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DTSTART;TZID=America/New_York:20260427T150000
DTEND;TZID=America/New_York:20260427T160000
DTSTAMP:20260510T164349
CREATED:20260401T191402Z
LAST-MODIFIED:20260420T211652Z
UID:10003927-1777302000-1777305600@cmsa.fas.harvard.edu
SUMMARY:Higher current algebras and chiral algebras
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Charles Young (University of Hertfordshire) \nTitle: Higher current algebras and chiral algebras \nAbstract: Vertex algebras capture physicists’ notion of OPEs in chiral CFTs\, in complex dimension one. For various motivations\, one would like to have analogs of vertex algebras in higher dimensions. Chiral algebras\, in the sense of Beilinson-Drinfeld and Francis-Gaitsgory\, provide a natural framework here\, because they re-express the vertex algebra axioms (which are rather sui generis\, and therefore hard to generalize) as something more recognizable (a chiral algebra is a Lie algebra\, of a sort).\nI will review this\, and then go on to introduce a certain concrete model of the unit chiral algebra in higher dimensions. In higher dimensions one is forced to work up to coherent homotopy in some fashion; in this model it turns out to be in the mildest fashion one could hope for: namely\, one moves from Lie algebras to their homotopy analogs\, L-infinity algebras\, and from chiral algebras to homotopy chiral algebras in a sense introduced by Malikov-Schechtman.\nThe main tool in the talk will be a strict cdga model — the polysimplicial model — of derived global sections of the structure sheaf on configuration space. The hope is that this model will prove well-adapted to doing concrete calculations\, and in that direction\, I will gesture towards a homotopy version of the usual Arnold/Orlik-Solomon relations for broken circuits. \nThis is joint work with Zhengping Gui and Laura Felder and is based largely on the preprint 2506.09728 \n  \n 
URL:https://cmsa.fas.harvard.edu/event/qft_42726/
LOCATION:CMSA G102\, 20 Garden Street\, Cambridge\, MA\, 02138
CATEGORIES:Quantum Field Theory and Physical Mathematics
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QFT-and-Physical-Mathematics-4.27.26.docx-1-scaled.png
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