The holomorphic discrete series contribution to the generalized Whittaker Plancherel formula

TY - JOUR

T1 - The holomorphic discrete series contribution to the generalized Whittaker Plancherel formula

AU - Frahm, Jan

AU - Ólafsson, Gestur

AU - Ørsted, Bent

PY - 2024/3

Y1 - 2024/3

N2 - For a Hermitian Lie group G of tube type we find the contribution of the holomorphic discrete series to the Plancherel decomposition of the Whittaker space L 2(G/N,ψ), where N is the unipotent radical of the Siegel parabolic subgroup and ψ is a certain non-degenerate unitary character on N. The holomorphic discrete series embeddings are constructed in terms of generalized Whittaker vectors for which we find explicit formulas in the bounded domain realization, the tube domain realization and the L 2-model of the holomorphic discrete series. Although L 2(G/N,ψ) does not have finite multiplicities in general, the holomorphic discrete series contribution does. Moreover, we obtain an explicit formula for the formal dimensions of the holomorphic discrete series embeddings, and we interpret the holomorphic discrete series contribution to L 2(G/N,ψ) as boundary values of holomorphic functions on a domain Ξ in a complexification G C of G forming a Hardy type space H 2(Ξ,ψ).

AB - For a Hermitian Lie group G of tube type we find the contribution of the holomorphic discrete series to the Plancherel decomposition of the Whittaker space L 2(G/N,ψ), where N is the unipotent radical of the Siegel parabolic subgroup and ψ is a certain non-degenerate unitary character on N. The holomorphic discrete series embeddings are constructed in terms of generalized Whittaker vectors for which we find explicit formulas in the bounded domain realization, the tube domain realization and the L 2-model of the holomorphic discrete series. Although L 2(G/N,ψ) does not have finite multiplicities in general, the holomorphic discrete series contribution does. Moreover, we obtain an explicit formula for the formal dimensions of the holomorphic discrete series embeddings, and we interpret the holomorphic discrete series contribution to L 2(G/N,ψ) as boundary values of holomorphic functions on a domain Ξ in a complexification G C of G forming a Hardy type space H 2(Ξ,ψ).

KW - Hardy space

KW - Holomorphic discrete series

KW - Whittaker Plancherel formula

KW - Whittaker vector

U2 - 10.48550/arXiv.2203.14784

DO - 10.48550/arXiv.2203.14784

M3 - Journal article

SN - 0022-1236

VL - 286

JO - Journal of Functional Analysis

JF - Journal of Functional Analysis

IS - 6

M1 - 110333

ER -