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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260421T161500
DTEND;TZID=America/New_York:20260421T180000
DTSTAMP:20260508T150720
CREATED:20260408T190831Z
LAST-MODIFIED:20260417T142320Z
UID:10003930-1776788100-1776794400@cmsa.fas.harvard.edu
SUMMARY:Introduction to A-infty categories
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \nSpeaker: Ahsan Khan\, Harvard CMSA \nTitle: Introduction to A-infty categories\n\nAbstract: I will give a pedagogical account of A-infty categories and the various places they show up in mathematical physics.\n 
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_42126/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Geometry-and-Quantum-Theory-Seminar-04.21.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260420T150000
DTEND;TZID=America/New_York:20260420T160000
DTSTAMP:20260508T150720
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260417T120000
DTEND;TZID=America/New_York:20260417T130000
DTSTAMP:20260508T150720
CREATED:20260212T190403Z
LAST-MODIFIED:20260409T160741Z
UID:10003906-1776427200-1776430800@cmsa.fas.harvard.edu
SUMMARY:Higgs and Coulomb branches: Geometry and Representation Theory
DESCRIPTION:Member Seminar \nSpeaker: Vasily Krylov \nTitle: Higgs and Coulomb branches: Geometry and Representation Theory \nAbstract: Higgs and Coulomb branches of quiver gauge theories form two important families of Poisson varieties that are expected to be exchanged under so-called 3D mirror symmetry. Quantized Coulomb branches are associative algebras deforming the algebras of functions on Coulomb branches. They are closely related to many important representation-theoretic structures\, such as Yangians\, quantum groups\, and Hecke algebras. In this talk\, I will discuss how 3D mirror symmetry\, together with other insights motivated by physics\, yields very explicit answers to purely representation-theoretic questions about representations of some of these quantum groups. Talk is based on joint works with Dinkins\, Karpov\, Klyuev\, and Lance.
URL:https://cmsa.fas.harvard.edu/event/member-seminar-41726/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Member-Seminar-4.17.26.docx.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260416T160000
DTEND;TZID=America/New_York:20260416T170000
DTSTAMP:20260508T150720
CREATED:20260317T165726Z
LAST-MODIFIED:20260402T134930Z
UID:10003918-1776355200-1776358800@cmsa.fas.harvard.edu
SUMMARY:Interpolation for points in $\mathbb{P}^N\, N\geq 2$
DESCRIPTION:Algebra Seminar \nSpeaker: Dipendranath Mahato\, Tulane University \nTitle: Interpolation for points in $\mathbb{P}^N\, N\geq 2$ \nAbstract: Interpolation problems study hypersurfaces in projective space passing through prescribed sets of points. Classically\, one asks how many independent conditions a collection of points imposes on hypersurfaces of a fixed degree\, a question that can be studied algebraically via homogeneous ideals and their Hilbert functions. In this talk\, I will begin with the classical interpolation problem for reduced points and introduce the algebraic framework used to study it. I will then move to fat point schemes\, where points are assigned multiplicities and hypersurfaces are required to vanish to higher order. In this setting\, interpolation problems naturally lead to symbolic powers of ideals and containment relations between symbolic and ordinary powers. I will conclude by discussing open questions\, including potential connections between interpolation problems and combinatorial structures such as matroids.
URL:https://cmsa.fas.harvard.edu/event/algebra-seminar_41626/
LOCATION:CMSA Room G02\, 20 Garden Street\, Cambridge\, MA\, 02138
CATEGORIES:Algebra Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Algebra-Seminar-4.16.26_G02.docx.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260414T161500
DTEND;TZID=America/New_York:20260414T180000
DTSTAMP:20260508T150720
CREATED:20260408T190745Z
LAST-MODIFIED:20260408T200311Z
UID:10003929-1776183300-1776189600@cmsa.fas.harvard.edu
SUMMARY:Abelian gauge fields and duality
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \nSpeaker: Dan Freed\, Harvard Math & CMSA \nTitle: Abelian gauge fields and duality \nAbstract: Motivated by the new paper arXiv:2603.19161\, I will give a general talk about abelian gauge fields\, including duality. I will start with classical Maxwell theory\, then discuss various “finite” examples\, the typical p-form abelian gauge field\, and some exotic examples such as Ramond–Ramond fields and the B-field in superstring theory. I will then get to the new paper and\, time permitting\, will suggest a very general framework that covers all examples. \n 
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_41426/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Geometry-and-Quantum-Theory-Seminar-04.14.26.docx.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260410T120000
DTEND;TZID=America/New_York:20260410T130000
DTSTAMP:20260508T150720
CREATED:20260212T190254Z
LAST-MODIFIED:20260330T200409Z
UID:10003905-1775822400-1775826000@cmsa.fas.harvard.edu
SUMMARY:Quantum topology from dynamics
DESCRIPTION:Member Seminar \nSpeaker: Sunghyuk Park\, CMSA \nTitle: Quantum topology from dynamics \nAbstract: Dynamics studies the long-term behavior of systems that evolve over time\, such as the famous Lorenz system.\nQuantum topology\, by contrast\, studies knots and low-dimensional manifolds through invariants that are usually constructed using representation-theoretic tools. In this talk\, I will explain how quantum invariants of knots and 3-manifolds can be recovered from the dynamics of certain three-dimensional flows. Time permitting\, I will also explain how this new bridge arises from ideas in topological string theory. \n 
URL:https://cmsa.fas.harvard.edu/event/member-seminar-41026/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Member-Seminar-4.10.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260409T160000
DTEND;TZID=America/New_York:20260409T170000
DTSTAMP:20260508T150720
CREATED:20260310T170229Z
LAST-MODIFIED:20260310T192334Z
UID:10003917-1775750400-1775754000@cmsa.fas.harvard.edu
SUMMARY:Multiplicities of graded families of ideals on Noetherian local rings
DESCRIPTION:Algebra Seminar \nSpeaker: Dale Cutkosky\, University of Missouri \nTitle: Multiplicities of graded families of ideals on Noetherian local rings \nAbstract: Let $R$ be an arbitrary $d$-dimensional Noetherian local ring with maximal ideal $m_R$. In this talk\, we give a generalization of the multiplicity $e(I)$ of an $m_R$-primary ideal $I$ of $R$ to a multiplicity $e(\mathcal I)$ of a graded family of $m_R$-primary ideals $\mathcal I$ in $R$. This multiplicity gives the classical multiplicity $e(I)$ if $\mathcal I=\{I^n\}$ is the $I$-adic filtration\, and agrees with the volume\, $\lim_{n\rightarrow \infty}d!\frac{\ell(R/I_n) }{n^d}$ for $R$ such that $\dim N(\hat R)>d$\, the required condition for the volume of graded families of $m_R$-primary ideals to exist as a limit. We will show that many of the classical theorems for the multiplicity of an ideal generalize to this multiplicity\, including mixed multiplicities\, the Rees theorem and the Minkowski inequality and equality. We give proofs which are independent of the theory of volumes and Okounkov bodies for all of our results\, with the one exception being the proof of the Minkowski equality. We do this by interpreting the multiplicity of graded families of $m_R$-primary ideals as an intersection product on the family of $R$-schemes which are obtained by blowing up $m_R$-primary ideals in $R$. \n 
URL:https://cmsa.fas.harvard.edu/event/algebra-seminar_4926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebra Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Algebra-Seminar-4.9.26.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260407T161500
DTEND;TZID=America/New_York:20260407T180000
DTSTAMP:20260508T150720
CREATED:20260402T150251Z
LAST-MODIFIED:20260402T152237Z
UID:10003928-1775578500-1775584800@cmsa.fas.harvard.edu
SUMMARY:A Mumford form on infinite Grassmannians
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \nSpeaker: Oswaldo Vázquez (Harvard) \nTitle: A Mumford form on infinite Grassmannians \nAbstract: The Polyakov measure in bosonic string theory can be expressed in terms of the Mumford form\, which is a trivializing section of a product of determinant line bundles over the moduli space of genus g curves. We will discuss the work in https://arxiv.org/abs/2412.18570\, which reviews how the moduli space can be embedded in an infinite dimensional Grassmannian as a Virasoro orbit and generalizes the Mumford form to other such orbits. In particular\, this “universal Mumford form” can be described in terms of coordinates in the Grassmannian\, which are amenable to computation and thus could have implications to the evaluation of amplitudes. \n 
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_4726/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Geometry-and-Quantum-Theory-Seminar-04.07.26.docx.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260406T163000
DTEND;TZID=America/New_York:20260406T173000
DTSTAMP:20260508T150720
CREATED:20251223T190645Z
LAST-MODIFIED:20260402T152156Z
UID:10003851-1775493000-1775496600@cmsa.fas.harvard.edu
SUMMARY:Facets of link homology
DESCRIPTION:Colloquium \nSpeaker: Mikhail Khovanov\, Johns Hopkins University \nTitle: Facets of link homology \nAbstract: We will review some link homology theories of algebraic origin and their connections to representation theory and geometry.
URL:https://cmsa.fas.harvard.edu/event/colloquium-22326/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-4.6.2026.docx.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260406T150000
DTEND;TZID=America/New_York:20260406T160000
DTSTAMP:20260508T150720
CREATED:20260224T161017Z
LAST-MODIFIED:20260401T201808Z
UID:10003912-1775487600-1775491200@cmsa.fas.harvard.edu
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260403T120000
DTEND;TZID=America/New_York:20260403T130000
DTSTAMP:20260508T150720
CREATED:20260212T190229Z
LAST-MODIFIED:20260331T190743Z
UID:10003904-1775217600-1775221200@cmsa.fas.harvard.edu
SUMMARY:Failures of Holographic Emergence
DESCRIPTION:Member Seminar \nSpeaker: Elliott Gesteau\, CMSA \nTitle: Failures of Holographic Emergence \nAbstract: Recent developments have taught us that some semiclassical spacetimes\, in particular those containing closed universe components\, cannot emerge from a holographic correspondence. In this talk\, I will explain how one can get to this conclusion by using either quantum information theory or properties of the large N limit of AdS/CFT\, and propose a criterion for detecting failures of spacetime emergence. \n 
URL:https://cmsa.fas.harvard.edu/event/member-seminar-4326/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Member-Seminar-4.3.26.docx.1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260401T120000
DTEND;TZID=America/New_York:20260401T130000
DTSTAMP:20260508T150720
CREATED:20260327T194647Z
LAST-MODIFIED:20260327T195536Z
UID:10003925-1775044800-1775048400@cmsa.fas.harvard.edu
SUMMARY:CMSA Q&A Seminar: Lauren Williams\, Harvard
DESCRIPTION:CMSA Q&A Seminar \nSpeaker: Lauren Williams\, Harvard \nTopic: The First Proof Project \n 
URL:https://cmsa.fas.harvard.edu/event/cmsaqa_4126/
LOCATION:Common Room\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:CMSA Q&A Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Q-A-Seminar-4.1.2026-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260331T161500
DTEND;TZID=America/New_York:20260331T180000
DTSTAMP:20260508T150720
CREATED:20260323T144017Z
LAST-MODIFIED:20260330T153340Z
UID:10003920-1774973700-1774980000@cmsa.fas.harvard.edu
SUMMARY:1-shifted Yangians from 1-shifted Lie bialgebras
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \nSpeaker: Vasily Krylov\, Harvard \nTitle: 1-shifted Yangians from 1-shifted Lie bialgebras \nAbstract: In the previous talk\, Keyou explained that the fusion of line defects in 3d holomorphic–topological field theories is expected to be governed by so-called DG-shifted Yangians. Following arXiv:2503.08770\, I will present examples of such DG-shifted Yangians arising from 1-shifted Lie bialgebras. We will discuss both the classical and DG-shifted settings from a purely mathematical perspective.
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_33126/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Geometry-and-Quantum-Theory-Seminar-03.31.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260330T150000
DTEND;TZID=America/New_York:20260330T160000
DTSTAMP:20260508T150720
CREATED:20260126T190411Z
LAST-MODIFIED:20260325T163011Z
UID:10003879-1774882800-1774886400@cmsa.fas.harvard.edu
SUMMARY:K-theoretic stable envelopes\, quantum loop groups and wall-crossings
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Tianqin Zhu\, Columbia University \nTitle: K-theoretic stable envelopes\, quantum loop groups and wall-crossings \nAbstract: The stable envelope is an important tool in both geometric representation theory and the enumerative geometry. One of the most important application is that it generates the geometric quantum loop group via the FRT formalism. In this talk\, we will show that the geometric quantum loop group is isomorphic to the Drinfeld double given by the preprojective K-theoretic Hall algebra and the nilpotent K-theoretic Hall algebra. Moreover we will show a more refined result that the wall-crossing for the K-theoretic stable envelope is controlled by the universal R-matrix for the slope subalgebra of the Drinfeld double\, which leads to the isomorphism between the wall subalgebra in geometric quantum loop groups and the slope subalgebras in the Drinfeld double. If time permits\, I will talk about the recent progress of such isomorphism in the case of the critcial stable envelopes in both critical K-theory and critical cohomology. This is based on the work 2511.02161 \n 
URL:https://cmsa.fas.harvard.edu/event/qft_33026/
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-3.30.26.docx.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260327T150000
DTEND;TZID=America/New_York:20260327T171500
DTSTAMP:20260508T150720
CREATED:20260323T145751Z
LAST-MODIFIED:20260323T194752Z
UID:10003922-1774623600-1774631700@cmsa.fas.harvard.edu
SUMMARY:Exotic R^4's are unclassifiable
DESCRIPTION:Freedman Seminar \nSpeaker: Robert Gompf\, UT Austin \nTitle: Exotic R^4’s are unclassifiable \nAbstract: We will use descriptive set theory to show that there is a precise sense in which exotic R^4’s are unclassifiable. For other open manifolds\, we can reach a much higher level of unclassifiability. This is work in progress with Aristotelis Panagiotopoulos.
URL:https://cmsa.fas.harvard.edu/event/freedman_32726/
LOCATION:Virtual
CATEGORIES:Freedman Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Freedman-Seminar-3.27.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260326T160000
DTEND;TZID=America/New_York:20260326T170000
DTSTAMP:20260508T150720
CREATED:20260127T192705Z
LAST-MODIFIED:20260310T192236Z
UID:10003883-1774540800-1774544400@cmsa.fas.harvard.edu
SUMMARY:The Beilinson-Bloch conjecture for some non-isotrivial varieties over global function fields
DESCRIPTION:Algebra Seminar \nSpeaker: Matt Broe\, Boston University \nTitle: The Beilinson-Bloch conjecture for some non-isotrivial varieties over global function fields \nAbstract: The Beilinson-Bloch conjecture is a generalization of the Birch and Swinnerton-Dyer conjecture\, which relates the ranks of Chow groups of smooth projective varieties over global fields to the order of vanishing of L-functions. We prove the conjecture for certain classes of non-isotrivial varieties over Fq(t)\, including some cubic threefolds and fivefolds. We deduce the Birch and Swinnerton-Dyer conjecture for their intermediate Jacobians\, and use it to establish new cases of the Tate conjecture over finite fields. \n 
URL:https://cmsa.fas.harvard.edu/event/algebra-seminar_32626/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebra Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Algebra-Seminar_3.26.26.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260326T133000
DTEND;TZID=America/New_York:20260326T143000
DTSTAMP:20260508T150720
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:20260324T161500
DTEND;TZID=America/New_York:20260324T180000
DTSTAMP:20260508T150720
CREATED:20260323T143256Z
LAST-MODIFIED:20260323T143854Z
UID:10003919-1774368900-1774375200@cmsa.fas.harvard.edu
SUMMARY:Line operators in holomorphic QFT
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \nSpeaker: Keyou Zeng (CMSA) \nTitle: Line operators in holomorphic QFT \nAbstract: We will discuss the recent work (arxiv:2508.11749)\, which defines the so called dg shifted Yangian. I will discuss their origin from the study of 3d holomorphic topological field theories\, a variant of 3d TQFT. A dg shifted Yangian is supposed to control the fusion of line defect in the corresponding 3d HT theories. I will illustrate these discussions in examples.
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_32426/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Geometry-and-Quantum-Theory-Seminar-03.24.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260319T160000
DTEND;TZID=America/New_York:20260319T170000
DTSTAMP:20260508T150720
CREATED:20260127T192620Z
LAST-MODIFIED:20260310T190851Z
UID:10003882-1773936000-1773939600@cmsa.fas.harvard.edu
SUMMARY:Moduli of subcanonical points
DESCRIPTION:Algebra Seminar \nSpeaker: Dawei Chen\, Boston College \nTitle: Moduli of subcanonical points \nAbstract: Subcanonical points are special Weierstrass points on smooth algebraic curves whose semigroups are symmetric. In this talk\, I will explain the rich geometry of the moduli space of subcanonical points\, with a focus on its connected components\, birational geometry\, topology\, and the deformation theory of related monomial singularities.
URL:https://cmsa.fas.harvard.edu/event/algebra-seminar_31926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebra Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Algebra-Seminar-3.19.26.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260318T140000
DTEND;TZID=America/New_York:20260318T150000
DTSTAMP:20260508T150720
CREATED:20260309T145907Z
LAST-MODIFIED:20260311T161332Z
UID:10003916-1773842400-1773846000@cmsa.fas.harvard.edu
SUMMARY:Dynamic reasoning
DESCRIPTION:New Technologies in Mathematics Seminar \nSpeaker: Emmanuel Abbé\, EPFL\, Institute of Mathematics and School of Computer and Communication Sciences & Apple \nTitle: Dynamic reasoning \nAbstract: In the current AI landscape\, reasoning is frequently equated with the generation of intermediate “thinking traces”. However\, these traces are merely a mechanism\, not the ultimate objective.\nRelying solely on the presence of a trace can be deceptive\, as models often learn to mimic the format of reasoning while effectively overfitting to specific training distributions.\nTo build more robust and versatile reasoners\, we shift our focus to more specific structural properties of the thinking process\, in particular compositionality (inductive CoT\, AdaBack) and abstraction (AbstRaL).
URL:https://cmsa.fas.harvard.edu/event/newtech_31826-2/
LOCATION:Virtual
CATEGORIES:New Technologies in Mathematics Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-NTM-Seminar-3.18.2026.docx-1-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260316T150000
DTEND;TZID=America/New_York:20260316T160000
DTSTAMP:20260508T150720
CREATED:20260224T160950Z
LAST-MODIFIED:20260311T180714Z
UID:10003911-1773673200-1773676800@cmsa.fas.harvard.edu
SUMMARY:Finite N indices from branes and negative branes
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Kasia Budzik (Harvard University) \nTitle: Finite N indices from branes and negative branes \nAbstract: Finite-N effects in large-N gauge theories\, such as trace relations\, are expected to be holographically dual to non-perturbative phenomena in string theory\, such as Giant Graviton branes. A convenient setting to study these effects are supersymmetric indices of U(N) gauge theories. The finite-N indices can be reproduced by a series of corrections to the infinite-N result\, known as the Giant Graviton expansion.\nIn this talk I will present a generalization of the Molien-Weyl formula computing generating functions of invariants of supergroups U(N|M)\, which arise as gauge groups of brane/negative brane systems in string theory. The formula leads to a new expansion relating finite-N and infinite-N indices of U(N) gauge theories. I will comment on its relation to Murthy’s Giant Graviton expansion and suggest a physical interpretation in terms of branes and negative branes. This talk is based on arXiv:2509.20451 and work in progress with Davide Gaiotto.
URL:https://cmsa.fas.harvard.edu/event/qft_31626/
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-3.16.26.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260312T133000
DTEND;TZID=America/New_York:20260312T143000
DTSTAMP:20260508T150720
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:20260310T161500
DTEND;TZID=America/New_York:20260310T180000
DTSTAMP:20260508T150720
CREATED:20260302T172556Z
LAST-MODIFIED:20260309T175638Z
UID:10003914-1773159300-1773165600@cmsa.fas.harvard.edu
SUMMARY:TQFTs do not detect the Milnor sphere
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \nSpeaker: Lorenzo Riva\, Harvard CMSA \nTitle: TQFTs do not detect the Milnor sphere \nAbstract: I will talk about the recent paper of Gripaios and Randall-Williams with that title\, where they prove that a functorial TQFT (i.e. a symmetric monoidal functor from the n-dimensional bordism category into a suitably nice target category) assigns the same value to homotopy spheres that bound a parallelizable manifold\, extending some no-go theorems of Reutter and Schommer-Pries.
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_31026/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Geometry-and-Quantum-Theory-Seminar-03.10.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260309T150000
DTEND;TZID=America/New_York:20260309T160000
DTSTAMP:20260508T150720
CREATED:20260224T160904Z
LAST-MODIFIED:20260224T160904Z
UID:10003910-1773068400-1773072000@cmsa.fas.harvard.edu
SUMMARY:Quantum Field Theory and Physical Mathematics
DESCRIPTION:Quantum Field Theory and Physical Mathematics Seminar \nSpeaker: Davide Gaiotto (Perimeter Institute)
URL:https://cmsa.fas.harvard.edu/event/qft_3926-2/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Field Theory and Physical Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260306T150000
DTEND;TZID=America/New_York:20260306T171500
DTSTAMP:20260508T150720
CREATED:20260205T145433Z
LAST-MODIFIED:20260225T152603Z
UID:10003889-1772809200-1772817300@cmsa.fas.harvard.edu
SUMMARY:Freedman Seminar: Mattie Ji\, Penn and Jeongwan Haah\, Stanford
DESCRIPTION:Freedman Seminar \nSpeakers: Mattie Ji (Penn) and Jeongwan Haah (Stanford) \nMattie Ji Title: Quantum Cellular Automata via Algebraic K-Theory \nAbstract: Algebraic K-theory\, on a very high level\, is the study of how to break apart and assemble objects linearly\, which makes the field amenable to classification questions. In this work\, we apply this methodology to study the classification of quantum cellular automata (QCA). Over an arbitrary commutative ring R and a general class of metric spaces X\, we construct a space of QCA that depends only on the large-scale (coarse) geometry of X. We explain how QCA classification groups (QCA modulo circuits) either arise naturally as or are refined by this space in most cases of interest. \nMotivated by negative K-theory\, we also show the classification of QCA on Euclidean lattices is given by an $\Omega$-spectrum indexed by the dimension. As a corollary\, we also obtain a non-connective delooping of the K-theory of Azumaya R-algebras\, whose negative homotopy groups are the QCA classification groups. When R is the complex numbers\, our method can be adapted to yield an $\Omega$-spectrum for QCA of $C^*$-algebras with unitary circuits. This talk is based on joint work with Bowen Yang. \n  \nJeongwan Haah Title: Fermionic QCA in 2d are trivial \nAbstract: We consider bounded spread automorphisms of Z/2-graded algebra (fermionic QCA) on the two-dimensional lattice and prove that every fQCA is a unitary circuit followed by fermionic shifts when stabilized by Majorana modes. This is an analog of a theorem by Freedman and Hastings for the case of ungraded algebras. The overall argument follows a similar line in that we show invertible subalgebras in 1d is trivial\, but the stabilization is used crucially. By an existing argument\, this triviality of fQCA in 2d implies that the 3d (bosonic) QCA that disentangles the Walker-Wang model with three-fermion theory is nontrivial. The latter was known to be nontrivial against Clifford gates but remained conjectural against more general unitary gates. To my knowledge\, this gives the only example ungraded QCA that is proved to be nontrivial against general unitary circuits and shifts\, and the only example ungraded invertible subalgebra that is not isomorphic to any tensor product algebra. I will explain elements new to the fermionic setting and give an overview of the nontriviality argument. (Based on an upcoming work with Jeffrey Kwan and David Long)
URL:https://cmsa.fas.harvard.edu/event/freedman_3626/
LOCATION:Hybrid
CATEGORIES:Freedman Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Freedman-Seminar-3.6.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260305T133000
DTEND;TZID=America/New_York:20260305T143000
DTSTAMP:20260508T150720
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:20260303T161500
DTEND;TZID=America/New_York:20260303T180000
DTSTAMP:20260508T150720
CREATED:20251223T191945Z
LAST-MODIFIED:20260209T160052Z
UID:10003853-1772554500-1772560800@cmsa.fas.harvard.edu
SUMMARY:Solitonic Symmetry: Cohomology with TFT Coefficients
DESCRIPTION:Geometry and Quantum Theory Seminar \nSpeaker: Sanjay Raman\, Harvard \nTitle: Solitonic Symmetry: Cohomology with TFT Coefficients \nAbstract: We review the formalism of https://arxiv.org/pdf/2307.00939\, which develops the theory of solitonic symmetry in quantum field theory. The algebraic structure of solitonic symmetry is determined by the fusion of topological functionals in a given path-integral formulation of topological field theory\, and acts generically on topological defects determined by homotopy classes of maps to a “space of fields.” We will argue that the structure of solitonic symmetry in a theory with field space (Y) assembles into what looks like the cohomology of (Y) with coefficients in TFTs. We study this formalism in examples and show in particular that the maximal invertible solitonic subsymmetry reduces to the expected result.
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_3326/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Geometry-Quantum-Theory-3.3.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260302T163000
DTEND;TZID=America/New_York:20260302T173000
DTSTAMP:20260508T150720
CREATED:20260206T191834Z
LAST-MODIFIED:20260224T141143Z
UID:10003890-1772469000-1772472600@cmsa.fas.harvard.edu
SUMMARY:Inverse problems in soft and active matter
DESCRIPTION:Colloquium \nSpeaker: L. Mahadevan\, Harvard \nTitle: Inverse problems in soft and active matter \nAbstract: How can one grow a face or a flower from a flat sheet? Fold a sheet into an origami pattern? Control phase separation? Transport a drop of active matter?  Steer an ant swarm? I will discuss potential answers to some of these inverse problems that unites ideas from optimal control and optimal transport for the steering of particles and fields.
URL:https://cmsa.fas.harvard.edu/event/colloquium-3226/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-3.2.2026.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260227T120000
DTEND;TZID=America/New_York:20260227T130000
DTSTAMP:20260508T150720
CREATED:20251223T204714Z
LAST-MODIFIED:20260223T194128Z
UID:10003867-1772193600-1772197200@cmsa.fas.harvard.edu
SUMMARY:Gauge theory\, from low dimensions to higher dimensions and back
DESCRIPTION:Member Seminar \nSpeaker: Saman Habibi Esfahani\, CMSA \nTitle: Gauge theory\, from low dimensions to higher dimensions and back \nAbstract: Almost thirty years ago\, Donaldson and Thomas proposed extending powerful ideas from gauge theory\, which had transformed the study of three- and four-dimensional manifolds\, to higher dimensions\, with the goal of defining new invariants of special holonomy manifolds. In this talk\, I will outline the main ideas behind this program\, mention some recent progress\, and describe the key obstacles that remain\, most notably non-compactness phenomena that make the analysis difficult.
URL:https://cmsa.fas.harvard.edu/event/member-seminar-22726/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Member-Seminar-2.27.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260226T133000
DTEND;TZID=America/New_York:20260226T143000
DTSTAMP:20260508T150720
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
END:VCALENDAR