Singularities and syzygies of secant varieties of nonsingular projective curves
Singularities and syzygies of secant varieties of nonsingular projective curves
复制标题
非奇异射影曲线割线簇的奇异性和共性
DOI:
10.1007/s00222-020-00976-5
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发表时间:
2020
影响因子:
3.1
通讯作者:
Park, Jinhyung
中科院分区:
文献类型:
--
作者:
Ein, Lawrence;Niu, Wenbo;Park, Jinhyung
In recent years, the equations defining secant varieties and their syzygies have attracted considerable attention. The purpose of the present paper is to conduct a thorough study on secant varieties of curves by settling several conjectures and revealing interaction between singularities and syzygies. The main results assert that if the degree of the embedding line bundle of a nonsingular curve of genusgis greater thanfor nonnegative integerskandp, then thek-th secant variety of the curve has normal Du Bois singularities, is arithmetically Cohen–Macaulay, and satisfies the property. In addition, the singularities of the secant varieties are further classified according to the genus of the curve, and the Castelnuovo–Mumford regularities are also obtained as well. As one of the main technical ingredients, we establish a vanishing theorem on the Cartesian products of the curve, which may have independent interests and may find applications elsewhere.
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