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arXiv 1602.08623math.AG
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关于行列式超曲面轨迹的维数

On the dimension of the locus of determinantal hypersurfaces

Zinovy Reichstein, Angelo Vistoli

摘要:

$n \times n$矩阵的$r$元组$(A_1,..., A_r)$的特征多项式是行列式$\det(x_0 I + x_1 A_1 + ... + x_r A_r)$ .证明了若$r$至少为3且$A = (A_1,..., A_r)$是一般位置上的矩阵的$r$ -元组,则直到共轭时,只有100多个矩阵的$r$ -元组具有与$A$相同的特征多项式.等价地,$n$次行列式超曲面在$P^r$中的轨迹是维数$(r-1)n^2 + 1$不可约的。

英文摘要:

The characteristic polynomial of an $r$-tuple $(A_1,..., A_r)$ of $n \times n$ matrices is the determinant $\det(x_0 I + x_1 A_1 + ... + x_r A_r)$. We show that if $r$ is at least 3 and $A = (A_1,..., A_r)$ is an $r$-tuple of matrices in general position, then up to conjugacy there are only finitely many $r$-tuples of matrices with the same characteristic polynomial as $A$. Equivalently, the locus of determinantal hypersurfaces of degree $n$ in $P^r$ is irreducible of dimension $(r-1)n^2 + 1$.

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