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arXiv 1602.08253math.RTmath.CT
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N-拟阿贝尔范畴与N-倾斜挠偶

N-Quasi-Abelian Categories vs N-Tilting Torsion Pairs

Luisa Fiorot

摘要:

这是一个公认的事实,即准阿贝尔范畴和倾斜扭转对的概念是等价的。这种等价性适用于包括$t$ -结构的倾斜对在内的更广泛的情况。首先,我们将这一图推广到$n$ -拟阿贝尔范畴和$n$ -倾斜挠类的层次中.证明了任何$n$ -拟阿贝尔范畴都有一个派生范畴,该派生范畴具有一个$n$ -倾斜的$t$ -结构对,使得它们的心是派生等价的.其次,我们将这些$t$ -结构的中心描述为相干函子的商范畴,推广了Auslander公式。第三,我们将我们的结果应用到Bridgeland的反常相干层理论的翻转压缩。在Bridgeland的工作中,相对维数$1$假设保证了$f_*$ -无圈凝聚层形成一个$1$ -倾斜挠类,其相关的心等价于$D(Y)$ .我们把这个定理推广到相对维数$2$上。

英文摘要:

It is a well established fact that the notions of quasi-abelian categories and tilting torsion pairs are equivalent. This equivalence fits in a wider picture including tilting pairs of $t$-structures. Firstly, we extend this picture into a hierarchy of $n$-quasi-abelian categories and $n$-tilting torsion classes. We prove that any $n$-quasi-abelian category admits a derived category endowed with a $n$-tilting pair of $t$-structures such that the respective hearts are derived equivalent. Secondly, we describe the hearts of these $t$-structures as quotient categories of coherent functors, generalizing Auslander's Formula. Thirdly, we apply our results to Bridgeland's theory of perverse coherent sheaves for flop contractions. In Bridgeland's work, the relative dimension $1$ assumption guaranteed that $f_*$-acyclic coherent sheaves form a $1$-tilting torsion class, whose associated heart is derived equivalent to $D(Y)$. We generalize this theorem to relative dimension $2$.

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