Math. Z. (2011) 269:555–586
DOI 10.1007/s00209-010-0750-1 Mathematische Zeitschrift
Wiener–Tauberian type theorems for radial sections
of homogenous vector bundles on certain rank one
Riemannian symmetric spaces of noncompact type
Sanjoy Pusti · Swagato K. Ray · Rudra P. Sarkar
Received: 19 March 2010 / Accepted: 8 June 2010 / Published online: 2 July 2010
© Springer-Verlag 2010
Abstract We will show that an uniform treatment yields Wiener–Tauberian type results
for various Banach algebras and modules consisting of radial sections of some homogenous
vector bundles on rank one Riemannian symmetric spaces G/ K of noncompact type. One
example of such a vector bundle is the spinor bundle. The algebras and modules we consider
are natural generalizations of the commutative Banach algebra of integrable radial functions
on G/ K . The first set of them are Beurling algebras with analytic weights, while the second
set arises due to Kunze–Stein phenomenon for noncompact semisimple Lie groups.
Keywords Lorentz spaces · Spinor · Wiener–Tauberian theorem
Mathematics Subject Classification (2000) Primary 43A85; Secondary 22E30
1 Introduction
A classical theorem of Norbert Wiener [51] states that if the Fourier transform of a function
f ∈ L
1
(R) has no real zeros then the finite linear combinations of translations f (x - a) of f
with complex coefficients form a dense subspace in L
1
(R), equivalently, span{g ∗ f | g ∈
L
1
(R)} is dense in L
1
(R). This theorem which is well known as the Wiener–Tauberian Theo-
rem (WTT), was generalized for abelian locally compact groups where the hypothesis is on a
Haar integrable function which has nonvanishing Fourier transform on all unitary characters.
S. Pusti (B ) · R. P. Sarkar
Stat-Math Unit, Indian Statistical Institute, 203 B. T. Rd., Calcutta 700108, India
e-mail: spusti_r@isical.ac.in
R. P. Sarkar
e-mail: rudra@isical.ac.in
S. K. Ray
Department of Mathematics and Statistics, Indian Institute of Technology Kanpur,
Kanpur 208016, India
e-mail: skray@iitk.ac.in
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