Varieties that are not stably rational, zero-cycles and unramified cohomology

Varieties that are not stably rational, zero-cycles and unramified cohomology
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不稳定有理数、零环和无分支上同调的簇

DOI:
10.1090/pspum/097.2/01713
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发表时间:
2016
期刊:
Algebraic Geometry: Salt Lake City 2015
影响因子:
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通讯作者:
Alena Pirutka
Alena Pirutka
中科院分区:
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文献类型:
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作者:
Alena Pirutka

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这是对最近不稳定理性品种的例子的调查。我们回顾了这些例子中使用的基于零圈Chow群性质的特殊化方法,并解释了构造特殊纤维的非平凡稳定不变量的未分支上同调的观点。特别地,我们得到了有理曲面上二维二次曲面上四重Brauer群的一个显式公式。
This is a survey of recent examples of varieties that are not stably rational. We review the specialization method based on properties of the Chow group of zero-cycles used in these examples and explain the point of view of unramified cohomology for the construction of nontrivial stable invariants of the special fiber. In particular, we find an explicit formula for the Brauer group of fourfolds fibered in quadrics of dimension two over a rational surface.
代数环和纤维化
DOI: 10.4171/dm/435
发表时间: 2013
影响因子: 0.9
作者:
Vial C
通讯作者: Vial C