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arXiv 0907.3717math.AG
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关于导范畴与奇异范畴的等价性

On equivalences of derived and singular categories

Vladimir Baranovsky, Jeremy Pecharich

摘要:

设X和Y是两个光滑的Deligne-Mumford栈,分别考虑一个函数f,g,分别在X上,Y.假设在A^1上X和Y的纤维积上存在层的复F(由f和g诱导),使得具有核F的傅里叶-向井变换给出X和Y上相干层的有界导出范畴之间的等价性。如果X_0、Y_0分别是f和g的过零纤维,则证明了X_0和Y_0的奇异导出范畴也是等价的。本文在McKay对应的背景下应用这一结论,并将Orlov关于加权射影空间中Calabi-Yau超曲面的导出范畴的一个结果推广到单复曲面簇中的Calabi-Yau超曲面与nef反正则类的乘积.

英文摘要:

Let X and Y be two smooth Deligne-Mumford stacks and consider a function f, resp. g, on X, resp. Y. Assume that there exists a complex F of sheaves on the fiber product of X and Y over A^1 (induced by f and g), such that the Fourier-Mukai transform with the kernel F gives an equivalence between the bounded derived categories of coherent sheaves on X and Y. If X_0 Y_0 are the fibers of f and g over zero, respectively, we show that the singular derived categories of X_0 and Y_0 are also equivalent. We apply this statement in the setting of McKay correspondence, and generalize a result of Orlov on the derived category of a Calabi-Yau hypersurface in a weighted projective space, to products of Calabi-Yau hypersurfaces in simplicial toric varieties with nef anticanonical class.

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