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arXiv 0810.0849math.RTmath.GR
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有限特殊线性群的非定义特征表示

Representations of finite special linear groups in non-defining characteristic

Alexander S. Kleshchev, Pham Huu Tiep

摘要:

我们精确地确定了$GL_{n}(q)$在限制为$SL_{n}(q)$时的不可约交叉特征表示的不可约和数。结合C. Bonnafe,这产生了$SL_{n}(q)$的不可约$\ell$ -模表示的规范标记,其中$(\ell,q)=1$。作为一个应用,我们分类的第一次复表示的$SL_{n}(q)$,其减少模$\ell$是不可约的。

英文摘要:

We determine precisely the number of irreducible summands of an irreducible cross characteristic representation of $GL_{n}(q)$ on restriction to $SL_{n}(q)$. Combined with a recent result of C. Bonnafe, this yields a canonical labeling for irreducible $\ell$-modular representations of $SL_{n}(q)$, where $(\ell,q)=1$. As an application, we classify for the first time complex representations of $SL_{n}(q)$ whose reductions modulo $\ell$ are irreducible.

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