- December 3, 2025
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Algebra Seminar: Dmitri Nikshych - Witt Reduction of Braided Fusion Categories
December 3, 2025 9:30 am - 10:30 am
Braided fusion categories can be viewed as “quantum analogues’’ of metric Lie algebras—those equipped with a symmetric invariant form. This goes back to Drinfeld’s work on quasi-Hopf algebras from 1980’s. This analogy allows one to adapt familiar linear-algebraic constructions to the categorical setting.
I will describe a notion of Witt reduction (or localization) for braided fusion categories over C, obtained by factoring out certain characteristic Tannakian subcategories. The resulting reduction gives rise to a complete invariant of the category that admits an interpretation in terms of orthogonal representations of finite groups over finite fields. This leads to new approaches to the classification of fusion categories and to natural group-theoretic questions. -
EDGE Seminar: Danil Koževnikov (University of Edinburgh) - Lagrangian skeleta of very affine complete intersections
December 3, 2025 10:50 am - 11:50 am
Bayes 5.46Abstract: In this talk, I will present some new results about skeleta of complete intersections inside (C*)^n. I will start by briefly reviewing the Batyrev-Borisov mirror construction, which uses combinatorial dualities between lattice polytopes to produce mirror pairs of Calabi-Yau complete intersections in Fano toric varieties. The main focus of the talk will be open Batyrev-Borisov complete intersections (…
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GGT: Samuël Borza
December 3, 2025 3:00 pm - 4:00 pm
G.8 Gaddum LT (1 George Square)Speaker(s):
Dear all,The Groups, Geometry, and Topology (GGT) seminar will take place Wednesday at 3pm; details below. There will also be a short pre-talk at 2.15 by the speaker in the same room.Speaker: Samuël Borza*New* Location: G.8 Gaddum LT (1 George Square)———————————Title: Ollivier-Ricci curvature in non-smooth Lorentzian geometry and causal set theoryAbstract: This talk will explore some aspects of non-smooth Lorentzian geometry, the mathematical theory underlying Einstein’s general relativity, which is currently being developed. Just as metric length spaces provide a synthetic generalisation of smooth Riemannian manifolds, the time-separation function plays the role of a ‘distance’ in Lorentzian geometry. The need for a non-smooth Lorentzian framework appeared early on, most famously with Penrose’s singularity theorems. After introducing the basic concepts and some initial results in this synthetic setting, we will turn to Causal Set Theory, a radical approach to quantum gravity in which spacetime is modelled as a discrete causal graph. I will formulate a new notion of curvature in the spirit of Ollivier-Ricci curvature, using optimal transport between causal diamonds (Alexandrov intervals).———————————Hope you can join,Alessandro and Matt -
GGT: Samuël Borza
December 3, 2025 3:00 pm - 4:00 pm
G.8 Gaddum LT (1 George Square)Speaker(s):
Dear all,The Groups, Geometry, and Topology (GGT) seminar will take place Wednesday at 3pm; details below. There will also be a short pre-talk at 2.15 by the speaker in the same room.Speaker: Samuël Borza*New* Location: G.8 Gaddum LT (1 George Square)———————————Title: Ollivier-Ricci curvature in non-smooth Lorentzian geometry and causal set theoryAbstract: This talk will explore some aspects of non-smooth Lorentzian geometry, the mathematical theory underlying Einstein’s general relativity, which is currently being developed. Just as metric length spaces provide a synthetic generalisation of smooth Riemannian manifolds, the time-separation function plays the role of a ‘distance’ in Lorentzian geometry. The need for a non-smooth Lorentzian framework appeared early on, most famously with Penrose’s singularity theorems. After introducing the basic concepts and some initial results in this synthetic setting, we will turn to Causal Set Theory, a radical approach to quantum gravity in which spacetime is modelled as a discrete causal graph. I will formulate a new notion of curvature in the spirit of Ollivier-Ricci curvature, using optimal transport between causal diamonds (Alexandrov intervals).———————————Hope you can join,Alessandro and Matt -
AGATE: tbd
December 3, 2025 3:00 pm - 4:00 pm
3.01 40 George Square, The University of Edinburgh, EH8 9JX, UKtbd
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- December 4, 2025
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AGQ integrability seminar
December 4, 2025 1:00 pm - 4:30 pm
G.02, 19 George SquareBayes Centre, room 5.46
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- December 5, 2025
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EDGE Seminar: Elizabeth Gasparim (Universidad Católica del Norte) - Applications of Lie Theory to Symplectic geometry
December 5, 2025 11:00 am - 12:00 pm
BAYES Meeting room 5.46 (capacity 30) (GB)Abstract: I will discuss the construction of Symplectic Lefschetz fibrations
using tools from classical Lie theory, and then explain how they were used
to provide examples of existence/nonexistence of Mirrors having the
prescribed categories of coherent sheaves and of singularities.
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- December 10, 2025
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Algebra Seminar: David Jaklitsch (Oslo) - ⊗-Frobenius functors and exact module categories
December 10, 2025 9:30 am - 10:30 am
Bayes 5.46Abstract: Frobenius algebras are structures relevant in multiple disciplines such as subfactor theory, conformal field theory or topological field theory. The purpose of the talk is to present results based on arxiv:2501.16978 about preservation and construction of Frobenius algebras. We introduce the notion of ⊗-Frobenius functors and provide characterizations relating them with the other Frobenius-type functors. These are used to twist module categories. Results on necessary and sufficient conditions for the preservation of certain properties under twisting and preservation of Frobenius algebras are summarized.
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AGATE: Iris Yoon (Wesleyan University) - tbd
December 10, 2025 3:00 pm - 4:00 pm
3.01 40 George Square, The University of Edinburgh, EH8 9JX, UKtbd
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- December 17, 2025
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AGATE: tbd
December 17, 2025 3:00 pm - 4:00 pm
3.01 40 George Square, The University of Edinburgh, EH8 9JX, UKtbd
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- December 18, 2025
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CANCELLED! AGQ integrability seminar
December 18, 2025 1:00 pm - 4:30 pm
School of Mathematics and Statistics, 132 University Pl, Glasgow G12 8TA, UK
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