Sheaves on the alcoves and modular representations I

Peter Fiebig; Martina Lanini

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arXiv · 1801.03959

Sheaves on the alcoves and modular representations I

Peter Fiebig·Martina Lanini

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Abstract

We consider the set of affine alcoves associated with a root system R as a topological space and consider a certain category S of sheaves of Z-modules on this space. Here Z is the structure algebra of the root system over a field k. To any wall reflection we associate a wall crossing functor on S. In the companion article "Sheaves on the alcoves and modular representations II" we prove that S encodes the simple rational characters of the connected, simply connected algebraic group with root system R over k, in the case that k is algebraically closed with characteristic above the Coxeter number.

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BibTeX RIS

Peter Fiebig, Martina Lanini. 2018-01-11. Sheaves on the alcoves and modular representations I. https://arxiv.org/abs/1801.03959

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