Abstract
By Richardson’s Theorem, there exists a dense open adjoint orbit in the nilpotent radical of any parabolic subalgebra of a semisimple Lie algebra. Elements contained in this orbit are called Richardson elements. Jensen, Su and Yu generalised the study of Richardson elements to seaweed (biparabolic) subalgebras, using ∆-filtered modules of a quasi-hereditary algebra arising as a quotient of the path algebra of a double quiver.In this thesis, we extend the study of these quiver representations to affine type
A, providing an explicit construction for a general ∆-filtered representation and a classification of the existence of open orbits in terms of the ∆-dimension vector. This allows us to give a combinatorial classification for the existence of Richardson elements in proper standard seaweed subalgebras of non-twisted affine Lie algebras of type A.
Date of Award | 22 Jun 2022 |
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Original language | English |
Awarding Institution |
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Supervisor | Xiuping Su (Supervisor) & Gunnar Traustason (Supervisor) |
Keywords
- quiver representations
- affine Lie algebras
- seaweed subalgebras