Closure of Steinberg fibers and affine Deligne-Lusztig varieties

@article{He2010ClosureOS,
  title={Closure of Steinberg fibers and affine Deligne-Lusztig varieties},
  author={Xuhua He},
  journal={arXiv: Representation Theory},
  year={2010}
}
  • Xuhua He
  • Published 1 March 2010
  • Mathematics
  • arXiv: Representation Theory
We discuss some connections between the closure $\bar F$ of a Steinberg fiber in the wonderful compactification of an adjoint group and the affine Deligne-Lusztig varieties $X_w(1)$ in the affine flag variety. Among other things, we describe the emptiness/nonemptiness pattern of $X_w(1)$ if the translation part of $w$ is quasi-regular. As a by-product, we give a new proof of the explicit description of $\bar F$, first obtained in \cite{H1}. 
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