Degree formula for Grassmann bundles
Degree formula for Grassmann bundles
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格拉斯曼丛的度数公式
DOI:
10.1016/j.jpaa.2015.05.024
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发表时间:
2015
影响因子:
0.8
通讯作者:
Tomohide Terasoma
中科院分区:
文献类型:
--
作者:
Hajime Kaji; Tomohide Terasoma
Let X be a non-singular quasi-projective variety over a field, and let E be a vector bundle over X. Let G X (d, E) be the Grassmann bundle of E over X parametrizing corank d subbundles of E with projection π: G X (d, E)→ X, let Q← π⁎ E be the universal quotient bundle of rank d, and denote by θ the Plücker class of G X (d, E), that is, the first Chern class of the Plücker line bundle, det Q. In this short note, a closed formula for the push-forward of powers of the Plücker class θ is given in terms of the Schur polynomials in Segre classes of E, which yields a degree formula for G X (d, E) with respect to θ when X is projective and∧ d E is very ample.
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