Massey products in the \'etale cohomology of number fields
Massey products in the \'etale cohomology of number fields
复制标题
数域 etale 上同调中的梅西积
DOI:
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发表时间:
2022
期刊:
影响因子:
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通讯作者:
Magnus Carlson
中科院分区:
文献类型:
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作者:
Eric Ahlqvist;Magnus Carlson
We give formulas for 3-fold Massey products in the \'etale cohomology of the ring of integers of a number field and use these to find the first known examples of imaginary quadratic fields with class group of $p$-rank two possessing an infinite $p$-class field tower, where $p$ is an odd prime. Furthermore, a necessary and sufficient condition, in terms of class groups of $p$-extensions, for the vanishing of 3-fold Massey products is given. As a consequence, we give an elementary and sufficient condition for the infinitude of class field towers of imaginary quadratic fields. We also disprove McLeman's $(3,3)$-conjecture. Lastly, we relate the vanishing of Massey products to the existence of Galois representations of $G_{\mathbb{Q},S}$ which realize an unexpectedly large class group for certain extensions of a quadratic imaginary number field.
DOI:
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发表时间:
2023
期刊:
Sigma
影响因子:
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作者:
Lam, Yeuk Hay;Liu, Yuan;Sharifi, Romyar;Wake, Preston;Wang, Jiuya
通讯作者:
Wang, Jiuya