Combinatorial Representation Theory: Discovering the Interfaces of Algebra with Geometry and Topology

Lead Research Organisation: University of Leeds
Department Name: Pure Mathematics

Abstract

A fundamental, and often successful, way of studying an abstract mathematical object is to consider methods of representing it in another, more concrete object. This is a powerful idea, and recent progress in algebraic representation theory and related areas has given rise to strong opportunities for the transformation of other fields. In particular, geometric and combinatorial phenomena initially specific to representation theory have emerged in many other fields, leading to effective new techniques and applications. Our team is at the forefront of these developments. The PI and the five CoIs have contributed to major advances in the past decade, with their expertise ranging from algebra, geometry, and topology to mathematical physics. This provides new ways to link algebra and geometry & topology. Examples include the categorification of the Grassmannian cluster structure, the McKay correspondence for reflection groups, the lifting of Lie-theoretic techniques to 2-dimensional category theory, with applications to topological physics, and the derivation of decomposition matrices of Brauer algebras from generalised Lie geometry. In all cases, the medium for interpolating between the theories is an emergent geometrical property which is not well understood. For the advancement of research, there is a strong need for explaining these phenomena and placing them in an encompassing novel paradigm. Our proposal hence seeks to understand and investigate relations between very different areas, and so to push on from there in a more systematic framework. This aim would benefit from a broad, holistic view of representation theory, embracing Lie theory, algebraic geometry, low dimensional topology and mathematical physics. Our team in Leeds is uniquely qualified to pursue this programme. Together with specialist collaboration of many mathematicians at our international partner institutions, we will address the current challenges, provide solutions to open questions and develop applications by establishing bridging to other fields. We are in a position to embrace the perspectives of both pure and application-driven mathematics, and with the potential, in the long term, for serving the needs of physical sciences, life sciences and engineering. This unification of perspectives requires a programme-level research structure and algebra is the right core platform for such an ambitious venture. Thus our proposal will push forward the mathematical state-of-the-art and will shape the future directions in the areas we touch upon.

Publications

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August J (2023) Cluster structures for the A8$A_\infty$ singularity in Journal of the London Mathematical Society

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August J (2023) Categories for Grassmannian Cluster Algebras of Infinite Rank in International Mathematics Research Notices

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Baur K (2023) Infinite friezes and triangulations of annuli in Journal of Algebra and Its Applications

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Baur K (2023) Corrigendum: A geometric model for the module category of a gentle algebra in International Mathematics Research Notices

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Baur K (2023) Listen2Intuition: A Mathematics & Arts exhibition project in European Mathematical Society Magazine

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Baur K (2023) Orbifold diagrams in Journal of Algebra

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Baur K (2022) Torsion pairs and cosilting in type A ˜ in Journal of Pure and Applied Algebra

 
Description Internal Algebra Seminar 
Form Of Engagement Activity A formal working group, expert panel or dialogue
Part Of Official Scheme? No
Geographic Reach Local
Primary Audience Professional Practitioners
Results and Impact This seminar is for the core team member (PI and CoIs, postdocs, PhD students of team members) and open to the pure mathematics department in Leeds. The contents vary:
We have mini courses by team members, talks by visitors and research discussions where team members present a current aspect of their research in a short talk (10 minutes). With this, we provide new opportunities to interact and create new collaborations.
Year(s) Of Engagement Activity 2022,2023
URL https://sites.google.com/view/crt-leeds/activities-in-leeds
 
Description Master Class 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Postgraduate students
Results and Impact 20-30 participants (early career researchers) attended this master class. I taught a course on cluster structures and geometric models
Year(s) Of Engagement Activity 2022
URL https://www.math.ku.dk/english/calendar/events/cart/
 
Description Resolutions in Local Algebra and Singularity Theory 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Professional Practitioners
Results and Impact High profile workshop in Oberwolfach, Germany. Co-I Eleonore Faber was an organiser for it.
Year(s) Of Engagement Activity 2023
URL https://www.mfo.de/occasion/2306/www_view