Global Iwasawa-decomposition of SL($n$, $\mathbb{A}_{\mathbb{Q}}$)

Olof Ahlén

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arXiv · 1609.06621

Global Iwasawa-decomposition of SL($n$, $\mathbb{A}_{\mathbb{Q}}$)

Olof Ahlén

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Abstract

We discuss the Iwasawa-decomposition of a general matrix in SL($n$, $\mathbb{Q}_p$) and SL($n$, $\mathbb{R}$). For SL($n$, $\mathbb{Q}_p$) we define an algorithm for computing a complete Iwasawa-decomposition and give a formula parameterizing the full family of decompositions. Furthermore, we prove that the $p$-adic norms of the coordinates on the Cartan torus are unique across all decompositions and give a closed formula for them which is proven using induction. For the case SL($n$, $\mathbb{R}$), the decomposition is unique and we give formulae for the complete decomposition which are also proven inductively. Lastly we outline a method for deriving the norms of the coordinates on the Cartan torus in the framework of representation theory. This yields a simple formula valid globally which expresses these norms in terms of the vector norms of generalized Plücker coordinates.

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Olof Ahlén. 2016-09-21. Global Iwasawa-decomposition of SL($n$, $\mathbb{A}_{\mathbb{Q}}$). https://arxiv.org/abs/1609.06621

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