English

Unitary Dual of p-adic U(5)

Representation Theory 2014-12-10 v1

Abstract

We study the parabolically induced complex representations of the unitary group in 5 variables, U(5), U(5), defined over a p-adic field. Let FF be a p-adic field. Let E:FE : F be a field extension of degree two. Let Gal(E:F)={1,σ}.Gal(E : F ) = \{ 1, \sigma \}. We write σ(x)=x  xE. \sigma(x) = \overline{x} \; \forall x \in E. Let E:=E{0} E^* := E \setminus \{ 0 \} and let E1:={xExx=1} E^1 := \{x \in E \mid x \overline{x} = 1 \}. U(5)U(5) has three proper standard Levi subgroups, the minimal Levi subgroup M0E×E×E1 M_0 \cong E^* \times E^* \times E^1 and the two maximal Levi subgroups M1GL(2,E)×E1 M_1 \cong GL(2, E) \times E^1 and M2E×U(3) M_2 \cong E^* \times U(3). We consider representations induced from the minimal Levi subgroup M0, M_0, representations induced from non-cuspidal, not fully-induced representations of the two maximal Levi subgroups M1 M_1 and M2, M_2, and representations induced from cuspidal representations of M1. M_1. We describe - except several particular cases - the unitary dual in terms of Langlands-quotients.

Keywords

Cite

@article{arxiv.1412.2924,
  title  = {Unitary Dual of p-adic U(5)},
  author = {Claudia Schoemann},
  journal= {arXiv preprint arXiv:1412.2924},
  year   = {2014}
}

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27 pages