#### DOCUMENTA MATHEMATICA, Vol. 15 (2010), 1009-1028

Ulrich Görtz, Xuhua He

Dimensions of Affine Deligne-Lusztig Varieties in Affine Flag Varieties

Affine Deligne-Lusztig varieties are analogs of Deligne-Lusztig varieties in the context of an affine root system. We prove a conjecture stated in the paper [5] by Haines, Kottwitz, Reuman, and the first named author, about the question which affine Deligne-Lusztig varieties (for a split group and a basic $\sigma$-conjugacy class) in the Iwahori case are non-empty. If the underlying algebraic group is a classical group and the chosen basic $\sigma$-conjugacy class is the class of $b=1$, we also prove the dimension formula predicted in op. cit. in almost all cases.

2010 Mathematics Subject Classification: 20F55, 20G25

Keywords and Phrases: Affine Deligne-Lusztig varieties

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