The stable cohomology of the Satake compactification of A g

The stable cohomology of the Satake compactification of A g
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Ag 佐竹紧致化的稳定上同调

DOI:
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
JIAMING CHEN
JIAMING CHEN
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文献类型:
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作者:
JIAMING CHEN

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Charney和Lee已经证明了A g的Satake-Bachelor-Borel分解A bb g的有理上同调稳定为g!1,他们计算这个稳定的上同调作为一个霍普夫代数。我们给出了一个相对简单的algebrogeometric证明他们的定理,并表明,这种稳定的上同调带有一个混合的霍奇结构,我们确定霍奇数。我们发现,Q的4 rC 2次本原上同调上的混合Hodge结构是Q的一个扩张. (cid:0)2 r(cid:0)1 /由Q . 0;特别是,它不是纯的。
Charney and Lee have shown that the rational cohomology of the Satake–Baily–Borel compactification A bb g of A g stabilizes as g ! 1 and they computed this stable cohomology as a Hopf algebra. We give a relatively simple algebrogeometric proof of their theorem and show that this stable cohomology comes with a mixed Hodge structure of which we determine the Hodge numbers. We find that the mixed Hodge structure on the primitive cohomology in degrees 4r C 2 with r (cid:21) 1 is an extension of Q . (cid:0) 2r (cid:0) 1 / by Q . 0 / ; in particular, it is not pure.
DOI: 10.4310/pamq.2017.v13.n2.a1
发表时间: 2017
影响因子: 0.7
作者:
Esnault, Hélène;Harris, Michael
通讯作者: Harris, Michael