BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CMSA - ECPv6.15.18//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:CMSA X-ORIGINAL-URL:https://cmsa.fas.harvard.edu X-WR-CALDESC:Events for CMSA REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20240310T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20241103T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20250309T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20251102T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20260308T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20261101T060000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/New_York:20251030T160000 DTEND;TZID=America/New_York:20251030T170000 DTSTAMP:20260417T175700 CREATED:20250904T162918Z LAST-MODIFIED:20251027T145519Z UID:10003782-1761840000-1761843600@cmsa.fas.harvard.edu SUMMARY:RCD structures on singular Kahler varieties DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Jian Song\, Rutgers University \nTitle: RCD structures on singular Kahler varieties \nAbstract: Let X be a 3-dimensional projective variety with klt singularities. We prove that every singular Kahler metric on X with bounded Nash entropy and Ricci curvature bounded below induces a unique compact RCD space homeomorphic to the projective variety X itself. In particular\, singular Kahler- Einstein spaces of complex dimension 3 with bounded Nash entropy are compact RCD spaces topologically and holomorphically equivalent to the underlying projective variety.  Such results establish connections among algebraic\, geometric and analytic structures of klt singularities from birational geometry and provide abundant examples of RCD spaces from algebraic geometry via complex Monge-Ampere equations. URL:https://cmsa.fas.harvard.edu/event/dgphys_103025/ LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-10.30.2025-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251023T160000 DTEND;TZID=America/New_York:20251023T170000 DTSTAMP:20260417T175700 CREATED:20250904T162649Z LAST-MODIFIED:20251021T144005Z UID:10003781-1761235200-1761238800@cmsa.fas.harvard.edu SUMMARY:On some new irrationality results DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Ron Donagi\, UPenn \nTitle: On some new irrationality results \nAbstract: An algebraic variety X is rational if a Zariski-open subset of X is isomorphic to a Zariski-open subset of projective space. A weaker property is unirationality: X is unirational if a Zariski-open subset of projective space maps onto a Zariski-open subset of X. These properties are equivalent in dimensions 1 and 2. In the seventies it was discovered that they are not equivalent in dimension 3\, as several different approaches succeeded in proving irrationality of some unirational varieties. The theory of Hodge atoms\, recently developed by Katzarkov\, Kontsevich\, Pantev and Yu\, uses ideas from mirror symmetry and quantum cohomology to exhibit new birational invariants capable of proving irrationality of some 4-dimensional unirational varieties. We illustrate the power of this new technique by applying it to the 4 dimensional intersection of quadrics in P^7. \n  \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_102325/ LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-10.23.2025.docx-1-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251016T160000 DTEND;TZID=America/New_York:20251016T170000 DTSTAMP:20260417T175700 CREATED:20250904T162550Z LAST-MODIFIED:20251014T150012Z UID:10003780-1760630400-1760634000@cmsa.fas.harvard.edu SUMMARY:Differential Geometry and Physics Seminar DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Andy Neitzke\, Yale \nTitle: Abelianization of tau functions \nAbstract: The symplectic and hyperkahler geometry of moduli spaces of flat connections over Riemann surfaces is in a sense quantized by the theory of isomonodromic tau functions. These functions in turn arise as partition functions in the conformal field theory of twisted free fermions. I will describe a new scheme for computing these tau functions via abelianization\, and what it produces in one simple example\, related to the Painleve I equation. This scheme is joint work with Qianyu Hao. The talk is intended to be self-contained (you don’t have to know in advance what a tau function or a conformal field theory is). \n  \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_101625/ LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-10.16.2025-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251009T160000 DTEND;TZID=America/New_York:20251009T170000 DTSTAMP:20260417T175700 CREATED:20250904T162516Z LAST-MODIFIED:20251010T130239Z UID:10003779-1760025600-1760029200@cmsa.fas.harvard.edu SUMMARY:Symmetries and Moduli Spaces: Baby Steps beyond Calabi-Yau DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Xingyang Yu\, Virginia Tech \nTitle: Symmetries and Moduli Spaces: Baby Steps beyond Calabi-Yau \nAbstract: I will explore the interplay between symmetries and moduli spaces in string compactifications\, starting from the familiar Calabi–Yau case and then taking some baby steps toward more general settings. A classical benchmark is the line bundle over Calabi–Yau complex structure moduli space\, whose physical counterpart corresponds to the Berry phase of the spectral flow operator in worldsheet SCFT. I will review this story and then discuss how it begins to change in c=1 theories with worldsheet anomalies\, and in G_2 and Spin(7) compactifications where U(1)_R symmetry is absent. The goal is not a finished framework\, but to highlight how anomalies and non-invertible symmetries may enter the picture and to raise open questions about what kinds of structures might live over moduli spaces beyond Calabi–Yau. URL:https://cmsa.fas.harvard.edu/event/dgphys_10925/ LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-9.9.2025-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251002T160000 DTEND;TZID=America/New_York:20251002T170000 DTSTAMP:20260417T175700 CREATED:20250904T162108Z LAST-MODIFIED:20250926T180606Z UID:10003778-1759420800-1759424400@cmsa.fas.harvard.edu SUMMARY:Special Kähler geometry and collapsing DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Valentino Tosatti\, NYU Courant Institute \nTitle: Special Kähler geometry and collapsing \nAbstract: Special Kähler geometry was first discovered in the context of N=2 supersymmetric 4D gauge theories\, and it also plays a prominent role in mirror symmetry. A key observation of Donagi-Witten and Freed is that the base of every algebraic integrable system admits a special Kähler metric\, while the total space admits a hyperkähler metric. In this talk I will consider compact hyperkähler manifolds with a an algebraic integrable system (i.e. a holomorphic Lagrangian torus fibration)\, and consider a family of hyperkähler metrics such that the volume of the torus fibers shrinks to zero. I will explain how the hyperkähler metrics must collapse to a special Kähler metric on the base (away from the discriminant locus)\, and what we can say about the metric completion of the limit. \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_10225/ LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-10.2.2025.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20250925T160000 DTEND;TZID=America/New_York:20250925T170000 DTSTAMP:20260417T175700 CREATED:20250826T192430Z LAST-MODIFIED:20250919T142937Z UID:10003762-1758816000-1758819600@cmsa.fas.harvard.edu SUMMARY:Degeneration of Calabi-Yau 3-folds and 3-forms DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Teng Fei\, Rutgers \nTitle: Degeneration of Calabi-Yau 3-folds and 3-forms \nAbstract: We study the geometries associated to various 3-forms on a symplectic 6-manifold of different orbital types. As an application\, we demonstrate how this can be used to find Lagrangian foliations and other geometric structures of interest arising from certain degeneration of Calabi-Yau 3-folds. \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_92525/ LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-9.25.2025.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20250918T160000 DTEND;TZID=America/New_York:20250918T170000 DTSTAMP:20260417T175700 CREATED:20250904T162209Z LAST-MODIFIED:20250910T174655Z UID:10003777-1758211200-1758214800@cmsa.fas.harvard.edu SUMMARY:Moduli spaces of 4d N=2 quantum field theories DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Robert Moscrop\, CMSA \nTitle: Moduli spaces of 4d N=2 quantum field theories \nAbstract: Supersymmetry endows quantum field theories with several rich algebraic and geometric structures associated to their moduli space of vacua\, providing powerful tools to study such theories non-perturbatively. For example\, in four-dimensional theories with eight supercharges\, the low energy dynamics of the theory is captured by an algebraic completely integrable system whose base is the Coulomb branch– a particular distinguished submanifold of the moduli space. This structure is so tightly constrained\, that there is an ongoing program to classify such theories purely by understanding their Coulomb branch geometry. In this talk\, I will give a gentle introduction to the geometry of the moduli spaces of 4d N=2 theories and\, time permitting\, discuss some recent results showcasing how the geometry of the Coulomb branch can be used to constrain certain physical quantities of the theory. \n  \n  \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_91825/ LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-9.18.2025-scaled.png END:VEVENT END:VCALENDAR