English

Distinction of the Steinberg representation for inner forms of $GL(n)$

Representation Theory 2016-12-30 v2

Abstract

Let FF be a non archimedean local field of characteristic not 22. Let DD be a division algebra of dimension d2d^2 over its center FF, and EE a quadratic extension of FF. If mm is a positive integer, to a character χ\chi of EE^*, one can attach the Steinberg representation St(χ)St(\chi) of G=GL(m,DFE)G=GL(m,D\otimes_F E). Let HH be the group GL(m,D)GL(m,D), we prove that St(χ)St(\chi) is HH-distinguished if and only if χF\chi_{|F^*} is the quadratic character ηE/Fmd1\eta_{E/F}^{md-1}, where ηE/F\eta_{E/F} is the character of FF^* with kernel the norms of EE^*. We also get multiplicity one for the space of invariant linear forms. As a corollary, we see that the Jacquet-Langlands correspondence preserves distinction for Steinberg representations.

Keywords

Cite

@article{arxiv.1602.05101,
  title  = {Distinction of the Steinberg representation for inner forms of $GL(n)$},
  author = {Nadir Matringe},
  journal= {arXiv preprint arXiv:1602.05101},
  year   = {2016}
}

Comments

We corrected a mistake in Section 3.1