Supercuspidal characters of $\operatorname{SL}_2$ over a $p$-adic field

Details Supercuspidal characters of $\operatorname{SL}_2$ over a $p$-adic field Supercuspidal characters of $\operatorname{SL}_2$ over a $p$-adic field

2010-12-26

arxiv.org/abs/1012.5548v1

Mathematics

Representation Theory

51 pages; 1 figure; to appear in "Harmonic analysis on reductive, p-adic groups"

Scientific paper

The character formulas of Sally and Shalika are an early triumph in $p$-adic harmonic analysis, but, to date, the calculations underlying the formulas have not been available. In this paper, which should be viewed as a precursor of the forthcoming volume by the authors and Alan Roche, we leverage modern technology (for example, the Moy-Prasad theory) to compute explicit character tables. An interesting highlight is the computation of the 'exceptional' supercuspidal characters, i.e., those depth-zero representations not arising by inflation-induction from a Deligne-Lusztig representation of finite $\operatorname{SL}_2$; this provides a concrete application for the recent work of DeBacker and Kazhdan.

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