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WEIGHTED ORLICZ ALGEBRAS ON LOCALLY COMPACT GROUPS

Part of: Linear function spaces and their duals Abstract harmonic analysis Commutative Banach algebras and commutative topological algebras

Published online by Cambridge University Press:  02 September 2015

ALEN OSANÇLIOL  and
SERAP ÖZTOP
ALEN OSANÇLIOL
Affiliation:
Department of Mathematics, Faculty of Science, İstanbul University, İstanbul, Turkey email [email protected]
SERAP ÖZTOP*
Affiliation:
Department of Mathematics, Faculty of Science, İstanbul University, İstanbul, Turkey email [email protected]
*
✉[email protected]
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Abstract

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For a locally compact group $G$ with left Haar measure and a Young function ${\rm\Phi}$, we define and study the weighted Orlicz algebra $L_{w}^{{\rm\Phi}}(G)$ with respect to convolution. We show that $L_{w}^{{\rm\Phi}}(G)$ admits no bounded approximate identity under certain conditions. We prove that a closed linear subspace $I$ of the algebra $L_{w}^{{\rm\Phi}}(G)$ is an ideal in $L_{w}^{{\rm\Phi}}(G)$ if and only if $I$ is left translation invariant. For an abelian $G$, we describe the spectrum (maximal ideal space) of the weighted Orlicz algebra and show that weighted Orlicz algebras are semisimple.

Keywords

weighted Orlicz spaceYoung functionunbounded approximate identitymaximal ideal spacesemisimple

MSC classification

Primary: 46E30: Spaces of measurable functions ($L^p$-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.)
Secondary: 43A15: $L^p$-spaces and other function spaces on groups, semigroups, etc. 46J20: Ideals, maximal ideals, boundaries
Type
Research Article
Information
Journal of the Australian Mathematical Society , Volume 99 , Issue 3 , December 2015 , pp. 399 - 414
Copyright
© 2015 Australian Mathematical Publishing Association Inc. 

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