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A New Class of Representations of EALA Coordinated by Quantum Tori in Two Variables

Published online by Cambridge University Press:  20 November 2018

S. Eswara Rao  and
Punita Batra
S. Eswara Rao
Affiliation:
School of Mathematics Tata Institute of Fundamental Research Homi Bhabha Road Mumbai 400 005 India, email: senapati@math.tifr.res.in
Punita Batra
Affiliation:
Department of Mathematics Harish-Chandra Research Institute Chhatnag Road Jhushi Allahabad 211 019 India, email: batra@mri.ernet.in
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Abstract

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We study the representations of extended affine Lie algebras $s{{\ell }_{\ell +1}}\left( {{\mathbb{C}}_{q}} \right)$ where $q$ is $N$-th primitive root of unity ($({{\mathbb{C}}_{q}}$ is the quantum torus in two variables). We first prove that $\oplus \,s{{\ell }_{\ell +1}}\left( \mathbb{C} \right)$ for a suitable number of copies is a quotient of $s{{\ell }_{\ell +1}}\left( {{\mathbb{C}}_{q}} \right)$. Thus any finite dimensional irreducible module for $\oplus \,s{{\ell }_{\ell +1}}\left( \mathbb{C} \right)$lifts to a representation of $s{{\ell }_{\ell +1}}\left( {{\mathbb{C}}_{q}} \right)$. Conversely, we prove that any finite dimensional irreducible module for $s{{\ell }_{\ell +1}}\left( {{\mathbb{C}}_{q}} \right)$ comes from above. We then construct modules for the extended affine Lie algebras $s{{\ell }_{\ell +1}}\left( {{\mathbb{C}}_{q}} \right)\oplus \mathbb{C}{{d}_{1}}\oplus \mathbb{C}{{d}_{2}}$ which is integrable and has finite dimensional weight spaces.

Keywords

17B6517B6617B68
Type
Research Article
Information
Canadian Mathematical Bulletin , Volume 45 , Issue 4 , 01 December 2002 , pp. 672 - 685
Copyright
Copyright © Canadian Mathematical Society 2002

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