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Automorphisms of threefolds of general type acting trivially in cohomology
Geometriae Dedicata ( IF 0.5 ) Pub Date : 2021-03-23 , DOI: 10.1007/s10711-021-00619-w
Hang Zhao

Let X be a minimal projective threefold of general type over \(\mathbb {C}\) with only Gorenstein quotient singularities, and let \(\mathrm {Aut}_{\mathbb {Q}}(X)\) be the subgroup of automorphisms acting trivially on \(H^*(X,\mathbb {Q})\). In this paper, we show that if X is of maximal Albanese dimension, then \(|\mathrm {Aut}_{\mathbb {Q}}(X)|\le 6\). Moreover, if X is nonsingular and \(K_X\) is ample, then \(|\mathrm {Aut}_{\mathbb {Q}}(X)|\le 5\). Seeking for higher-dimensional examples of varieties with nontrivial \(\mathrm {Aut}_{\mathbb {Q}}(X)\), we concern d-folds X isogenous to an unmixed product of curves. If \(d=3\), we show that \(\mathrm {Aut}_{\mathbb {Q}}(X)\) is a 2-elementray abelian group whose order is at most 4 under some conditions on their minimal realizations. Moreover, each of the possible groups can be realized. If \(d\ge 3\), we give a sufficient condition for \(\mathrm {Aut}_{\mathbb {Q}}(X)\) being trivial. Curiously, there exist examples of projective threefolds X with terminal singularities and maximal Albanese dimension whose \(\mathrm {Aut}_{\mathbb {Q}}(X)\) can have an arbitrarily large order.



中文翻译:

在同调中微不足道的三倍普通型的同构

X为仅具有Gorenstein商奇异性的\(\ mathbb {C} \)上的普通类型的最小投影三倍性,并设\(\ mathrm {Aut} _ {\ mathbb {Q}}(X)\)为同构作用于\(H ^ *(X,\ mathbb {Q})\)的自同构子集。在本文中,我们证明了如果X具有最大阿尔巴涅斯维数,则\(| \ mathrm {Aut} _ {\ mathbb {Q}}(X)| \ le 6 \)。此外,如果X为非奇数\(K_X \)足够,则\(| \ mathrm {Aut} _ {\ mathbb {Q}}(X)| \ le 5 \)。寻求具有非平凡\(\ mathrm {Aut} _ {\ mathbb {Q}}(X)\)的变种的高维示例,我们关注d-folds X isogenous为曲线的未混合的产物。如果\(d = 3 \),则表明\(\ mathrm {Aut} _ {\ mathbb {Q}}(X)\)是2个元素的阿贝尔群,在某些条件下,它们的阶数最多为4最小的实现。此外,可以实现每个可能的组。如果\(d \ ge 3 \),我们给出足够的条件使\(\ mathrm {Aut} _ {\ mathbb {Q}}(X)\)不重要。奇怪的是,存在具有终极奇点和最大阿尔巴涅斯维数的射影三折X的示例,其\(\ mathrm {Aut} _ {\ mathbb {Q}}(X)\)可以具有任意大的阶数。

更新日期:2021-03-24
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