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- W4211107661 abstract "Malle proposed a conjecture for counting the number of $G$-extensions $L/K$ with discriminant bounded above by $X$, denoted $N(K,G;X)$, where $G$ is a fixed transitive subgroup $Gsubset S_n$ and $X$ tends towards infinity. We introduce a refinement of Malle's conjecture, if $G$ is a group with a nontrivial Galois action then we consider the set of crossed homomorphisms in $Z^1(K,G)$ (or equivalently $1$-coclasses in $H^1(K,G)$) with bounded discriminant. This has a natural interpretation given by counting $G$-extensions $F/L$ for some fixed $L$ and prescribed extension class $F/L/K$. If $T$ is an abelian group with any Galois action, we compute the asymptotic growth rate of this refined counting function for $Z^1(K,T)$ (and equivalently for $H^1(K,T)$) and show that it is a natural generalization of Malle's conjecture. The proof technique is in essence an application of a theorem of Wiles on generalized Selmer groups, and additionally gives the asymptotic main term when restricted to certain local behaviors. As a consequence, whenever the inverse Galois problem is solved for $Gsubset S_n$ over $K$ and $G$ has an abelian normal subgroup $Ttrianglelefteq G$ we prove a nontrivial lower bound for $N(K,G;X)$ given by a nonzero power of $X$ times a power of $log X$. For many groups, including many solvable groups, these are the first known nontrivial lower bounds. These bounds prove Malle's predicted lower bounds for a large family of groups, and for an infinite subfamily they generalize Kluners' counter example to Malle's conjecture and verify the corrected lower bounds predicted by Turkelli." @default.
- W4211107661 created "2022-02-13" @default.
- W4211107661 creator A5063777958 @default.
- W4211107661 date "2021-12-31" @default.
- W4211107661 modified "2023-10-18" @default.
- W4211107661 title "Statistics of the first Galois cohomology group : A refinement of Malle’s conjecture" @default.
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- W4211107661 doi "https://doi.org/10.2140/ant.2021.15.2513" @default.
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