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arXiv math/0103237math.NT
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单位L函数与Katz猜想

Unit L-functions and a conjecture of Katz

Matthew Emerton, Mark Kisin

摘要:

令f:X -> Y是特征为p的有限域上的有限型概型的分离态射,λ是具有有限剩余域的Artin局部Z_p-代数,m是λ的极大理想,L^ \bullet是Y的有限自由λ-模层的有界可构造复形.证明了L函数L(X,L^ \bullet)/L(Y,f_!L(\bullet)是1+T λ [[T]]的先验元素,实际上位于1+ m T λ [T]中。这意味着Katz的一个猜想,它预言了闭单位圆盘上的p-adic étale lisse层的L-函数的零点和极点在紧支集下的平展上同调的位置。

英文摘要:

Let f: X -> Y be a separated morphism of schemes of finite type over a finite field of characteristic p, let Lambda be an artinian local Z_p-algebra with finite residue field, let m be the maximal ideal of Lambda, and let L^\bullet be a bounded constructible complex of sheaves of finite free Lambda-modules on the étale site of Y. We show that the ratio of L-functions L(X,L^\bullet)/L(Y,f_! L^\bullet), which is a priori an element of 1+T Lambda[[T]], in fact lies in 1+ m T Lambda [T]. This implies a conjecture of Katz predicting the location of the zeroes and poles of the L-function of a p-adic étale lisse sheaf on the closed unit disk in terms of étale cohomology with compact support.

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