Vol. 254, No. 2, 2011

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An analogue of Krein’s theorem for semisimple Lie groups

Sanjoy Pusti

Vol. 254 (2011), No. 2, 381–395
Abstract

We give an integral representation of K-positive definite functions on a real rank n connected, noncompact, semisimple Lie group with finite centre. Moreover, we characterize the λ’s for which the τ-spherical function ϕσ,λτ is positive definite for the group G = Spine(n,1) and the complex spin representation τ.

Keywords
positive definite functions, K-positive definite functions, τ-positive definite functions
Mathematical Subject Classification 2010
Primary: 43A85
Secondary: 22E30
Milestones
Received: 10 July 2011
Revised: 19 July 2011
Accepted: 25 July 2011
Published: 27 February 2012
Authors
Sanjoy Pusti
Mathematics Research Unit
University of Luxembourg, Campus Kirchberg
6, rue Richard Coudenhove-Kalergi
1359 Luxembourg
Luxembourg