arXiv subjects

Pascale Harinck

Publications and source records attributed to Pascale Harinck.

9 recordsLinked to original sources

arXiv2025

Local zeta functions for a class of p-adic symmetric spaces (II)

In this paper we study the zeta functions associated to the minimal spherical principal series of representations for a class of reductive p-adic symmetric spaces, which are realized as open orbits of some prehomogeneous spaces. These symmetric spaces have been studied in the paper arXiv: 2003.05764. We prove that the zeta functions satisfy a functional equation which is given explicitly (see Theorem 4.3.9 and Theorem 4.4.5). Moreover, for a subclass of these spaces, we define L-functions and epsilon-factors associated to the representations.

math.RT↗

arXiv2020

Local Zeta Functions for a class of p-adic symmetric spaces

This is an extended version of the first part of a forthcoming paper where we will study the local Zeta functions of the minimal spherical series for the symmetric spaces arising as open orbits of the parabolic prehomogeneous spaces of commutative type over a p-adic field. The case where the ground field is $\mathbb{R}$ has already been considered by Nicole Bopp and the second author ([7]). If $F$ is a p-adic field of characteristic $0$, we consider a reductive Lie algebra $\widetilde{\mathfrak{g}}$ over $F$ which is endowed with a short $\mathbb{Z}$-grading: $\widetilde{\mathfrak{g}} = \mathfrak{g}_{-1}\oplus\mathfrak{g}_{0}\oplus \mathfrak{g}_1$. We also suppose that the representation $(\mathfrak{g}_0, \mathfrak{g}_1)$ is absolutely irreducible. Under a so-called regularity condition we study the orbits of $G_{0}$ in $\mathfrak{g}_{1}$, where $G_{0}$ is an algebraic group defined over $F$, whose Lie algebra is $\mathfrak{g}_{0}$. We also investigate the $P$-orbits, where $P$ is a minimal $σ$-split parabolic subgroup of $G$ ($σ$ being the involution which defines a structure of symmetric space on any open $G_{0}$-orbit in $\mathfrak{g}_1$).

math.RT↗

arXiv2018

Relative trace formula for compact quotient and pseudocoefficients for relative discrete series

We introduce the notion of relative pseudocoefficient for relative discrete series of real spherical homogeneous spaces of reductive groups. We prove that such relative pseudocoefficient does not exist for semisimple symmetric spaces of type G(C)/G(R) and construct strong relative pseudocoefficients for some hyperbolic spaces. We establish a toy model for the relative trace formula of H.Jacquet for compact discrete quotient Γ\G. This allows us to prove that a relative discrete series which admits strong pseudocoefficient with sufficiently small support occurs in the spectral decomposition of L^2(Γ\G) with a nonzero period.

math.RT↗

arXiv2017

Paley-Wiener theorems for a p-adic spherical variety

Let S(X) be the Schwartz space of compactly supported smooth functions on the p-adic points of a spherical variety X, and let C(X) be the space of Harish-Chandra Schwartz functions. Under assumptions on the spherical variety, which are satisfied when it is symmetric, we prove Paley-Wiener theorems for the two spaces, characterizing them in terms of their spectral transforms. As a corollary, we get relative analogs of the smooth and tempered Bernstein centers -- rings of multipliers for S(X) and C(X). When X= a reductive group, our theorem for C(X) specializes to the well-known theorem of Harish-Chandra, and our theorem for S(X) corresponds to a first step -- enough to recover the structure of the Bernstein center -- towards the well-known theorem of Bernstein and Heiermann.

math.RT↗

arXiv2016

A local relative trace formula for PGL(2)

Following a scheme inspired by B. Feigon, we describe the spectral side of a local relative trace formula for $G:= PGL(2,\rm E)$ relative to the symmetric subgroup $H:=PGL(2,\rm F)$ where $\rm E/\rm F$ is an unramified quadratic extension of local non archimedean fields of characteristic $0$. This spectral side is given in terms of regularized normalized periods and normalized $C$-functions of Harish-Chandra. Using the geometric side obtained in a more general setting by P. Delorme, P. Harinck and S. Souaifi , we deduce a local relative trace formula for $G$ relative to $H$. We apply our result to invert some orbital integrals.

math.RT↗

arXiv2015

Geometric side of a local relative trace formula

Following a scheme suggested by B. Feigon, we investigate a local relative trace formula in the situation of a reductive $p$ -adic group $G$ relative to a symmetric subgroup $H= \underline{H}(F)$ where $\underline{H}$ is split over the local field $F$ of characteristic zero and $G = \underline{G} (F)$ is the restriction of scalars of $\underline{H} _{I E}$ relative to a quadratic unramified extension $E$ of $F$. We adapt techniques of the proof of the local trace formula by J. Arthur in order to get a geometric expansion of the integral over $H \times H$ of a truncated kernel associated to the regular representation of $G$.

math.RT↗

arXiv2014

Regularity of some invariant distributions on nice symmetric pairs

J.~Sekiguchi determined the semisimple symmetric pairs (g,h), called nice symmetric pairs, on which there is no non-zero invariant eigendistribution with singular support. On such pairs, we study regularity of invariant distributions annihilated by a polynomial of the Casimir operator. We deduce that invariant eigendistributions on (gl(4,R),gl(2,R)*gl(2,R)) are locally integrable functions.

math.RT↗

arXiv2011

Distributions propres invariantes sur la paire sym\' etrique (gl(4,R),gl(2,R)*gl(2,R))

We study orbital integrals and invariant eigendistributions for the symmetric pair (g,h)=(gl(4,R),gl(2,R)*gl(2,R)). Let q=g/h and let N be the set of nilpotents of q. We first obtain an asymptotic behavior of orbital integrals around nonzero semisimple elements of q. We study eigendistributions around such elements and give an explicit basis of eigendistributions on q-N given by a locally integrable function on q-N.

math.RT↗

arXiv2008

Solution non universelle pour le problème KV-78

In 78' M. Kashiwara and Vergne conjectured some property on the Campbell-Hausdorff series in such way a trace formula is satisfied. They proposed an explicit solution in the case of solvable Lie algebras. In this note we prove that this "solvable solution" is not universal. Our method is based on computer calculation. Furthermore our programs prove up to degree 16, Drinfeld's Lie algebra $\mathfrak{grt}_1$ coincides with the Lie algebra $\hat{kv_2}$ defined in \cite{AT}.

math.GR↗