Let X be a locally symmetric space defined by a simple Chevalley group G and a congruence subgroup of . In this generality, the Weyl law for X was proved by Lindenstrauss and Venkatesh. In the case where G is simply connected, we sharpen their result by giving a power-saving estimate for the remainder term.
"On the remainder term of the Weyl law for congruence subgroups of Chevalley groups." Duke Math. J. 170 (4) 653 - 695, 15 March 2021. https://doi.org/10.1215/00127094-2020-0094