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arXiv 2104.11528math.RTmath.NT
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$(\mathrm{GL}_{n+1},\mathrm{GL}_n)$标准表示的外重数定理

Ext-Multiplicity Theorem for Standard Representations of $(\mathrm{GL}_{n+1},\mathrm{GL}_n)$

Kei Yuen Chan

摘要:

令$π_1$是$\mathrm{GL}_{n+1}(F)$的标准表示,令$π_2$是$\mathrm{GL}_n(F)$的标准表示的光滑对偶。当$F$非阿基米德时,证明了当$i=0$时$\mathrm{Ext}^i_{\mathrm{GL}_n(F)}(π_1, π_2)$是$\cong \mathbb C$,当$i \geq 1$时为零.证明的主要工具是左和右Bernstein-Zelevinsky过滤的概念。该结果的直接后果是给出了最多一个定理的多重性的新证明。同时,我们还研究了D. Prasad关于Kazhdan-Lusztig多项式的系数。当$F$是阿基米德域时,利用左右Bruhat滤子证明了标准主级数的等秩Fourier-Jacobi模型的一个多重性结果.

英文摘要:

Let $π_1$ be a standard representation of $\mathrm{GL}_{n+1}(F)$ and let $π_2$ be the smooth dual of a standard representation of $\mathrm{GL}_n(F)$. When $F$ is non-Archimedean, we prove that $\mathrm{Ext}^i_{\mathrm{GL}_n(F)}(π_1, π_2)$ is $\cong \mathbb C$ when $i=0$ and vanishes when $i \geq 1$. The main tool of the proof is a notion of left and right Bernstein-Zelevinsky filtrations. An immediate consequence of the result is to give a new proof on the multiplicity at most one theorem. Along the way, we also study an application of an Euler-Poincaré pairing formula of D. Prasad on the coefficients of Kazhdan-Lusztig polynomials. When $F$ is an Archimedean field, we use the left-right Bruhat-filtration to prove a multiplicity result for the equal rank Fourier-Jacobi models of standard principal series.

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