BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CMSA - ECPv6.15.18//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH 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 BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20270314T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20271107T060000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/New_York:20260326T133000 DTEND;TZID=America/New_York:20260326T143000 DTSTAMP:20260418T070257 CREATED:20260323T144545Z LAST-MODIFIED:20260324T172207Z UID:10003921-1774531800-1774535400@cmsa.fas.harvard.edu SUMMARY:Gauge theory on Hyperkähler manifolds DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker. Emily Autumn Windes (New Uzbekistan University) \nTitle: Gauge theory on Hyperkähler manifolds \nAbstract: In this talk\, I describe various distinguished classes of connections on Hyperkähler manifolds and their dimensional reductions. Then\, I describe a construction of new examples of Sp(2)-instantons\, primitive HYM connections\, and Spin(7)-instantons with symmetry on the manifold T*CP2. This talk is based on joint work with Jesse Madnick and Izar Alonso. URL:https://cmsa.fas.harvard.edu/event/dgphys_32627/ 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-3.26.26.docx-1.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260312T133000 DTEND;TZID=America/New_York:20260312T143000 DTSTAMP:20260418T070257 CREATED:20260309T143543Z LAST-MODIFIED:20260309T161222Z UID:10003915-1773322200-1773325800@cmsa.fas.harvard.edu SUMMARY:Strongly adapted contact geometry of Anosov 3-flows DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Surena Hozoori (Brandeis) \nTitle: Strongly adapted contact geometry of Anosov 3-flows \nAbstract: We will discuss some recent developments in the contact geometric theory of Anosov 3-flows\, whose roots go back to the works of Mitsumatsu and Eliashberg-Thurston in the mid 1990s. In particular\, we provide a contact geometric characterization of Anosov 3-flows based on interactions with Reeb dynamics\, as well as investigate the basic properties of the resulting geometries. Time permitting\, we will discuss how these results allow one to re-approach some classical questions in Anosov dynamics. URL:https://cmsa.fas.harvard.edu/event/dgphys_31226/ 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-3.12.26-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260305T133000 DTEND;TZID=America/New_York:20260305T143000 DTSTAMP:20260418T070257 CREATED:20260220T155737Z LAST-MODIFIED:20260303T174902Z UID:10003909-1772717400-1772721000@cmsa.fas.harvard.edu SUMMARY:Fukaya categories and higher representation theory DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Vivek Shende (Syddansk Universitet & UC Berkeley) \nTitle: Fukaya categories and higher representation theory \nAbstract: I will explain how Lagrangian Floer homology in certain monopole moduli spaces recovers the Khovanov homology and its relatives\, by a description strikingly similar to the Oszvath-Szabo Heegard-Floer theory.  I will also explain how the ‘sectorial descent’ of Fukaya categories can be used to construct Rouquier’s promised monoidal structure on the category of representations of the categorified “positive part” of the quantum group.  This is joint work with Mina Aganagic\, Elise LePage\, and Peng Zhou. \nNote: Location change to Harvard Science Center Room 300H \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_3526/ LOCATION:Harvard Science Center\, 1 Oxford Street\, Cambridge\, MA\, 02138 CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-3.5.26.docx-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260226T133000 DTEND;TZID=America/New_York:20260226T143000 DTSTAMP:20260418T070257 CREATED:20260122T151917Z LAST-MODIFIED:20260220T171301Z UID:10003876-1772112600-1772116200@cmsa.fas.harvard.edu SUMMARY:Higher Symmetries\, Eta Invariants and Anomaly Theories  DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Mirjam Cvetic\, University of Pennsylvania \nTitle: Higher Symmetries\, Eta Invariants and Anomaly Theories \nAbstract: In recent years\, much progress has been made in understanding the extra-dimensional origin of higher symmetry structures of many quantum field theories (QFTs) obtained via geometric engineering. Among others\, our understanding of anomaly structures in QFTs has been significantly improved. Key in these considerations is the asymptotic boundary of the internal dimensions which geometrizes many topological QFT features. Within this context we present explicit results for anomaly coefficients in five-dimensional supersymmetric QFTs that are engineered in M-theory on Calabi-Yau three-folds\, and show that eta-invariants of the asymptotic boundary of the engineered geometry are key to determine 1-form self-anomaly coefficients. The results both for orbifolds with isolated and non-isolated orbifold singularities are presented. \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_22626/ 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-2.26.26-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260219T133000 DTEND;TZID=America/New_York:20260219T143000 DTSTAMP:20260418T070257 CREATED:20260122T151851Z LAST-MODIFIED:20260217T153656Z UID:10003875-1771507800-1771511400@cmsa.fas.harvard.edu SUMMARY:Topics in the Relation of Four-Manifold Invariants and Supersymmetric Field Theory DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Greg Moore\, Rutgers University \nTitle: Topics in the Relation of Four-Manifold Invariants and Supersymmetric Field Theory \nAbstract: We will begin with a review of topological twisting as a choice of background fields. We then review the standard paradigm for the formulation of Donaldson invariants as correlation functions in twisted supersymmetric N=2 d=4 quantum field theory\, together with the quantum field theory (QFT) derivation of the relation of the Donaldson invariants to Seiberg-Witten invariants. We then consider what can be said using other twisted QFTs. We present some new results on the four-manifold invariants derived from N=2 supersymmetric QCD. We then move on to 5d theories and the “K-theoretic Donaldson invariants” and comment briefly on the 6d theories and the “elliptic Donaldson invariants.” In the unlikely event that time permits we finish with the extension to families of four-manifolds\, where the coupling to a suitably twisted and truncated superconformal gravity is expected to produce invariants valued in the cohomology of the classifying space of the diffeomorphism group of the four-manifold. URL:https://cmsa.fas.harvard.edu/event/dgphys_21926/ 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-2.19.26-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260212T133000 DTEND;TZID=America/New_York:20260212T143000 DTSTAMP:20260418T070257 CREATED:20260122T151823Z LAST-MODIFIED:20260206T203024Z UID:10003874-1770903000-1770906600@cmsa.fas.harvard.edu SUMMARY:Gromov-Hausdorff limits of collapsing Calabi-Yau fibrations DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Gabor Szekelyhidi\, Northwestern University \nTitle: Gromov-Hausdorff limits of collapsing Calabi-Yau fibrations \nAbstract: A well studied problem is the metric behavior of Calabi-Yau metrics on a fibration in a family of Kahler classes that collapses the fibers. I will discuss recent progress showing that the Gromov-Hausdorff limit can be identified with the base of the fibration\, generalizing results of Gross-Tosatti-Zhang\, Song-Tian-Zhang and Li-Tosatti. A new ingredient is to exploit the RCD property of the Gromov-Hausdorff limit. URL:https://cmsa.fas.harvard.edu/event/dgphys_21226/ 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-2.12.26-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260205T144500 DTEND;TZID=America/New_York:20260205T154500 DTSTAMP:20260418T070257 CREATED:20260122T151728Z LAST-MODIFIED:20260202T164823Z UID:10003873-1770302700-1770306300@cmsa.fas.harvard.edu SUMMARY:On E7+1/2 gauge theory DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Yinan Wang\, Peking University \nTitle: On E7+1/2 gauge theory\n\nAbstract: We propose that an exotic gauge theory based on the intermediate Lie algebra E7+1/2 naturally appears in the landscape of 6d F-theory. We give strong evidence of this proposal with 6d anomaly cancellation\, dual M-theory geometry and elliptic genus of the single-string worldsheet CFT.  URL:https://cmsa.fas.harvard.edu/event/dgphys2526_2/ 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-2.5.26_2-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260205T133000 DTEND;TZID=America/New_York:20260205T143000 DTSTAMP:20260418T070257 CREATED:20260122T151622Z LAST-MODIFIED:20260203T184418Z UID:10003872-1770298200-1770301800@cmsa.fas.harvard.edu SUMMARY:Index from a point DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Monica Jinwoo Kang\, Texas A&M University \nTitle: Index from a point \nAbstract: We argue that protected data of 4d N=2 SCFTs admits a purely algebro-geometric characterization. We conjecture that both the Macdonald index (and hence the Schur index) and the Higgs branch are encoded by a bifiltered affine scheme determined by OPE nilpotency and decoupling relations. Focusing on Argyres–Douglas theories\, where the Higgs branch is a point\, we show that this geometric construction suffices to reconstruct the full Macdonald index. This is based on recent works with Craig Lawrie and Jaewon Song. URL:https://cmsa.fas.harvard.edu/event/dgphys__2526/ 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-2.5.26_1-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20260129T133000 DTEND;TZID=America/New_York:20260129T143000 DTSTAMP:20260418T070257 CREATED:20251223T195721Z LAST-MODIFIED:20260122T171100Z UID:10003860-1769693400-1769697000@cmsa.fas.harvard.edu SUMMARY:Complete Calabi-Yau Metrics and Optimal Transport DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Tristan Collins\, University of Toronto \nTitle: Complete Calabi-Yau Metrics and Optimal Transport \nAbstract: I will discuss the connection between optimal transport and the existence of complete Calabi-Yau metrics on log Calabi-Yau varieties.  I will explain how the geometric problem of constructing complete Calabi-Yau metrics gives rise to problems in the boundary regularity theory for optimal transport\, and how ideas from geometry can be used to make progress on some of these problems.  This talk will survey joint works with Li\, Tong\, Tong-Yau\, Firester\, and Tong-Firester. URL:https://cmsa.fas.harvard.edu/event/dgphys_12926/ 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-1.29.26-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251204T120000 DTEND;TZID=America/New_York:20251204T130000 DTSTAMP:20260418T070257 CREATED:20250904T163130Z LAST-MODIFIED:20251203T150446Z UID:10003786-1764849600-1764853200@cmsa.fas.harvard.edu SUMMARY:Towards a Dolbeault AGT correspondence DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Surya Raghavendran\, Yale \nTitle: Towards a Dolbeault AGT correspondence \nAbstract: The AGT correspondence and its extensions propose geometric constructions of vertex algebras and their modules from the cohomology of various moduli spaces of sheaves on surfaces. Physically\, the correspondence is illuminated throgh the holomorphic–topological twist of the six-dimensional N=(2\,0) superconformal field theories. In this talk\, I will describe a variant of AGT arising instead from the so-called minimal twist of these theories. In this setting\, the natural algebraic structures are holomorphic factorization algebras in three complex dimensions. From these\, one can extract an associative algebra together with a natural module\, which we conjecture to coincide with a quantization of the moduli of Higgs sheaves on surfaces. In examples\, this pair is furthermore expected to admit a Hodge–de Rham deformation to the Heisenberg algebra and its action on the cohomology of Hilbert schemes of surfaces\, as constructed by Grojnowski and Nakajima. \n  \n  \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_12425/ 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-12.4.2025.docx-1-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251120T160000 DTEND;TZID=America/New_York:20251120T170000 DTSTAMP:20260418T070257 CREATED:20250904T163048Z LAST-MODIFIED:20251117T220513Z UID:10003785-1763654400-1763658000@cmsa.fas.harvard.edu SUMMARY:Tropical-Topological(Tropological) Sigma Models DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Andrés Franco Valiente\, UC Berkeley \nTitle: Tropical-Topological (Tropological) Sigma Models \nAbstract: Tropical geometry provides a powerful bridge between complex and combinatorial worlds\, allowing certain curve-counting invariants to be computed in a piecewise-linear “tropical” limit. Building on Mikhalkin’s insight that Gromov–Witten invariants can be recovered from tropical curves\, this talk revisits Mikhalkin’s result from the viewpoint of topological field theory and functional integration.  I will first review the topological sigma model and explain how the localization equations admit a natural notion of tropicalization which allows us to reproduce the Gromov-Witten invariants using standard cohomological BRST methods without having to reformulate the functional integral in terms of the tropical semifield. We find that the relevant geometries associated to the tropical limit of the topological sigma models no longer require a complex structure but they are instead based on nilpotent structures on singular foliated manifolds. We close with a discussion on recent progress on how the tropological sigma model has a close connection to Hořava’s topologicial quantum gravity for Ricci Flow in a joint work with Emil Albrychiewicz and Viola Zixin Zhao. \n  \n  \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_112025/ LOCATION:Virtual CATEGORIES:Differential Geometry and Physics Seminar ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-11.20.2025.docx-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251106T160000 DTEND;TZID=America/New_York:20251106T170000 DTSTAMP:20260418T070257 CREATED:20250904T163021Z LAST-MODIFIED:20251104T160806Z UID:10003784-1762444800-1762448400@cmsa.fas.harvard.edu SUMMARY:Dimension Reduction and Adiabatic Limits of Generalized ASD Instantons DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Dylan Galt\, Harvard \nTitle: Dimension Reduction and Adiabatic Limits of Generalized ASD Instantons \nAbstract: I will begin by explaining a dimension reduction result for Tian’s generalized ASD instantons over product manifolds\, which generalizes work of Yuanqi Wang on codimension-one reduction and includes the cases of G2 and Spin(7) instantons as well as degree zero Hermitian-Yang-Mills connections. The proof is inspired by a simple observation about the Yang-Mills energy and suggests a natural adiabatic picture for these generalized ASD connections. I will describe ongoing work towards establishing such an adiabatic scheme\, emphasizing some of the complications that arise in the general case and explaining what can be said for G2 instantons. Everything I will talk about is joint work with my collaborator Langte Ma. \n  URL:https://cmsa.fas.harvard.edu/event/dgphys_11625/ 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-11.6.2025.docx-scaled.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20251030T160000 DTEND;TZID=America/New_York:20251030T170000 DTSTAMP:20260418T070257 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:20260418T070257 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:20260418T070257 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:20260418T070257 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:20260418T070257 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:20260418T070257 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:20260418T070257 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