Hilbert squares: derived categories and deformations
Hilbert squares: derived categories and deformations
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希尔伯特平方:派生类别和变形
DOI:
10.1007/s00029-019-0482-y
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Belmans P
中科院分区:
文献类型:
--
作者:
Belmans P
For a smooth projective varietyXwith exceptional structure sheaf, andthe Hilbert scheme of two points onX, we show that the Fourier–Mukai functorinduced by the universal ideal sheaf is fully faithful, provided the dimension ofXis at least 2. This fully faithfulness allows us to construct a spectral sequence relating the deformation theories ofXandand to show that it degenerates at the second page, giving a Hochschild–Kostant–Rosenberg-type filtration on the Hochschild cohomology ofX. These results generalise known results for surfaces due to Krug–Sosna, Fantechi and Hitchin. Finally, as a by-product, we discover the following surprising phenomenon: for a smooth projective variety of dimension at least 3 with exceptional structure sheaf, it is rigid if and only if its Hilbert scheme of two points is rigid. This last fact contrasts drastically to the surface case: non-commutative deformations of a surface contribute to commutative deformations of its Hilbert square.
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DOI:
10.1112/jlms/jdn064
发表时间:
2006-10
期刊:
Journal of the London Mathematical Society
影响因子:
--
作者:
N. Markarian
通讯作者:
N. Markarian
影响因子:
1.4
作者:
Andreas Krug
通讯作者:
Andreas Krug
DOI:
10.1007/s00029-015-0178-x
发表时间:
2015
期刊:
Selecta Mathematica
影响因子:
--
作者:
Andreas Krug (with P. Sosna)
通讯作者:
Andreas Krug (with P. Sosna)
影响因子:
0.5
作者:
Dmitri Orlov
通讯作者:
Dmitri Orlov
影响因子:
0.9
作者:
Pieter Belmans
通讯作者:
Pieter Belmans