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arXiv 1601.07599math.RT
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典型群酉群的一些界--非Archimeden情形

Some bounds on unitary duals of classical groups - non-archimeden case

Marko Tadic

摘要:

本文的第一部分给出了经典p-adic群的抛物诱导表示中可幺正化子元出现的域的界。粗略地说,它只有在极小抛物子群的模特征标的平方根以适当的方式支配诱导不可约尖点表示的中心特征标时才能出现。对于由固定抛物子群支撑的表示,给出了一个更精确的界。也有特定的伯恩斯坦成分的界限。这些上界中的一些是最佳可能的。第二部分的文件解决了一个问题有多远的平凡表示从其余的unramified自守对偶。利用L. Clozel,平凡表示在整体域的完备上的分裂秩1半单群的自守对偶中是孤立的,但它很少在酉对偶中是孤立的(它只能发生在阿基米德的情况下)。此外,SL(2)情形中的隔离程度对于数论是重要的。对于高阶群,平凡表示总是孤立于酉对偶中,这是D.卡日丹然而,我们可能会问,在自守的情况下,孤立的程度是否更高。我们证明了这个问题的答案是否定的辛p-adic群。

英文摘要:

In the first part of the paper we give some bounds for domains where the unitarizabile subquotients can show up in the parabolically induced representations of classical p-adic groups. Roughly, it can show up only if the central character of the inducing irreducible cuspidal representation is dominated in an appropriate way by the square root of the modular character of minimal parabolic subgroup. For representations supported by fixed parabolic subgroup, a more precise bound is given. There are also bounds for specific Bernstein components. A number of these upper bounds are best possible. The second part of the paper addresses a question how far is the trivial representation from the rest of the unramified automorphic dual. By a result of L. Clozel, trivial representation is isolated in the automorphic dual of a split rank one semisimple group over a completion of a global field, but it is very seldom isolated in the unitary dual (it can happen only in the archimedes cases). Further, the level of isolation in the case of SL(2) is important for the number theory. For the higher rank groups, the trivial representation is always isolated in the unitary dual by an old result of D. Kazhdan. Still, we may ask if the level of isolation is higher in the case of the automorphic duals. We show that the answer is negative to this question for symplectic p-adic groups.

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