Some moduli spaces for rank 2 stable reflexive sheaves on

Some moduli spaces for rank 2 stable reflexive sheaves on
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2 阶稳定自反滑轮的一些模空间

DOI:
10.1090/s0002-9947-1987-0869229-0
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发表时间:
1987
影响因子:
1.3
通讯作者:
R. Miró
R. Miró
中科院分区:
数学1区
文献类型:
--
作者:
R. Miró

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.在[Ma]中,Maruyama证明了P3上秩为2的稳定自反层与Chern类(q,c2,c3)的同构类的集合M(c1,c2,c3)具有作为代数概型的自然结构.到目前为止,关于这些格式的维数、不可约性、合理性等问题还没有一般性的结果,只有在少数情况下才知道它们的精确描述。本文研究了M(-1,c2,c2 rc 2 + 2 r(r + 1)),其中c2 > 4,1 <r<(-1 + ^4c2 - 7)/2,以及A/(-1,c2,c2| - 2(r-l)c2),其中c2>8,2 <r-l(-l + y-c1 - 7)/2。
. In [Ma], Maruyama proved that the set M(c\,c2, c3) of isomorphism classes of rank 2 stable reflexive sheaves on P3 with Chern classes (q, c2,c3) has a natural structure as an algebraic scheme. Until now, there are no general results about these schemes concerning dimension, irreducibility, rationality, etc. and only in a few cases a precise description of them is known. This paper is devoted to the following cases: (i) M(-\,c2,c\ - 2rc2 + 2r(r + 1)) with c2 > 4, 1 <r< (-1 + ^4c2 - 7)/2; and (ii) A/(-l,c2,c| - 2(r - l)c2) with c2>8, 2 « r«(-1 + y^c, - 7)/2.