Global Iwasawa-decomposition of SL($n$, $\mathbb{A}_{\mathbb{Q}}$)
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.
- Publication:
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arXiv e-prints
- Pub Date:
- September 2016
- DOI:
- 10.48550/arXiv.1609.06621
- arXiv:
- arXiv:1609.06621
- Bibcode:
- 2016arXiv160906621A
- Keywords:
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- Mathematics - Number Theory;
- High Energy Physics - Theory;
- Mathematics - Group Theory
- E-Print:
- 20 pages