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Week of October 19, 2025

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October 20, 2025
Geometric Analysis Seminar Hanbing Fang - Stony Brook University 3:45pm -
KT 906
Geometry, Symmetry and Physics [3] Strong uniqueness of tangent flows at cylindrical singularities in the Ricci flow Hanbing Fang - Stony Brook University 3:45pm -
KT 906
October 21, 2025
Geometry & Topology [4] Torus decomposition and foliation detected slopes Qingfeng Lyu - Boston College 4:30pm -
KT 207
October 23, 2025
Analysis [5] Scattering and wave asymptotics of the multi-pole Aharonov–Bohm Hamiltonian Mengxuan Yang - Princeton University 4:00pm -
KT 201
Geometry, Symmetry and Physics [3] Refined Gromov-Witten invariants Yannik Schuler - ETH Zurich 4:30pm -
KT 801
October 24, 2025
Friday Morning Seminar [6] Computational Complexity in Algebraic Combinatorics Greta Panova - USC 10:00am -
KT 801
Quantum Topology and Field Theory [7] Delannoy category, its uses and diagrammatics Mikhail Khovanov - Johns Hopkins University 4:30pm -
KT 801

Abstracts

Week of October 19, 2025

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October 20, 2025
Geometric Analysis Seminar 3:45pm -
KT 906
Geometry, Symmetry and Physics [3] Strong uniqueness of tangent flows at cylindrical singularities in the Ricci flow 3:45pm -
KT 906

Abstract:  The uniqueness of tangent flows is central to understanding singularity formation in geometric flows. A foundational result of Colding and Minicozzi establishes this uniqueness at cylindrical singularities under the Type I assumption in the Ricci flow. In this talk, I will present a strong uniqueness result for cylindrical tangent flows at the first singular time. Our proof hinges on a Łojasiewicz inequality for the pointed $\mathcal{W}$-entropy, which is established under the assumption that the local geometry near the base point is close to a standard cylinder or its quotient. This is joint work with Yu Li.

October 21, 2025
Geometry & Topology [4] Torus decomposition and foliation detected slopes 4:30pm -
KT 207

Boyer, Gordon, and Hu proposed a relative version of the L-space conjecture using slope detections and conjectured that this should be equivalent to the L-space conjecture for toroidal manifolds. We establish the equivalence for the foliation-detection part.

October 23, 2025
Analysis [5] Scattering and wave asymptotics of the multi-pole Aharonov–Bohm Hamiltonian 4:00pm -
KT 201

Abstract: The famous Aharonov–Bohm effect demonstrates the non-trivial quantum mechanical effect of (singular) magnetic potentials. Although the single pole case has been studied widely using rotational and scaling invariance, the technique fails to work for the Aharonov–Bohm Hamiltonian with multiple poles. In this talk, we will discuss a new framework to study the resolvent, resonances, and wave asymptotics of the Aharonov–Bohm Hamiltonian with multiple poles. This results in an interesting behavior where scattering and wave asymptotics depend on the magnetic fluxes, interpolating the odd and even dimensional Euclidean scattering. This talk includes joint works with Tanya Christiansen and Kiril Datchev. 

Geometry, Symmetry and Physics [3] Refined Gromov-Witten invariants 4:30pm -
KT 801

Abstract: Gromov–Witten invariants enumerate curves in a variety X via stable maps. In practise, degenerate contributions lead to substantial overcounting which makes these invariants far from being optimal. When X is a Calabi–Yau threefold, a set of more fundamental curve counting invariants is provided by Gopakumar–Vafa invariants. In this talk, I will propose a refined correspondence conjecture between Gromov–Witten and Gopakumar–Vafa invariants when X carries a non-trivial torus action. This refinement mathematically realises and generalises features which were expected from the so called refined topological string in physics literature. I will present evidence for the conjecture in case X is the local projective plane. This is based on joint work with Andrea Brini.

October 24, 2025
Friday Morning Seminar [6] Computational Complexity in Algebraic Combinatorics 10:00am -
KT 801

Representation theoretic multiplicities are at the heart of many open
problems in algebraic combinatorics. At the same time these
quantities appear in Geometric Complexity Theory in the search for
multiplicity obstructions for separating computational complexity
classes like VP vs VNP. Most recently they have also been considered
in quantum computing.
In this talk we will introduce the objects and problems, explain how
formalization through computational complexity theory could answer
some of the open problems in the negative. We will also explain their
role in GCT and quantum computing with a mixture of positive and
negative answers.

Quantum Topology and Field Theory [7] Delannoy category, its uses and diagrammatics 4:30pm -
KT 801

Abstract: Following Harman, Snowden and Snyder we’ll explain the construction of the Delannoy category, its properties and how it leads to a categorification of the ring of integer-valued polynomials. We’ll also discuss a diagrammatic description of that category, in a work in progress with Noah Snyder.

Seminar webpage: https://sites.google.com/yale.edu/qtft-seminar/fall-2025 [10]

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Links
[1] https://calendar.math.yale.edu/list/calendar/grid/week/2025-W42 [2] https://calendar.math.yale.edu/list/calendar/grid/week/2025-W44 [3] https://calendar.math.yale.edu/seminars/geometry-symmetry-and-physics [4] https://calendar.math.yale.edu/seminars/geometry-topology [5] https://calendar.math.yale.edu/seminars/analysis [6] https://calendar.math.yale.edu/seminars/friday-morning-seminar [7] https://calendar.math.yale.edu/seminars/quantum-topology-and-field-theory-0 [8] https://calendar.math.yale.edu/list/calendar/grid/week/abstract/2025-W42 [9] https://calendar.math.yale.edu/list/calendar/grid/week/abstract/2025-W44 [10] https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsites.google.com%2Fyale.edu%2Fqtft-seminar%2Ffall-2025&data=05%7C02%7Calr34%40connect.yale.edu%7C214596414c7d482a2c1d08de126ce0ba%7Cdd8cbebb21394df8b4114e3e87abeb5c%7C0%7C0%7C638968456007110861%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5zz1tV8ZCcsONvruONKl1j96bKTmESCsy5clxQZulZ4%3D&reserved=0