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The moduli space of hypersurfaces whose singular locus has high dimension (1208.1118v2)

Published 6 Aug 2012 in math.AG

Abstract: Let $k$ be an algebraically closed field and let $b$ and $n$ be integers with $n\geq 3$ and $1\leq b \leq n-1.$ Consider the moduli space $X$ of hypersurfaces in $\mathbb{P}n_k$ of fixed degree $l$ whose singular locus is at least $b$-dimensional. We prove that for large $l$, $X$ has a unique irreducible component of maximal dimension, consisting of the hypersurfaces singular along a linear $b$-dimensional subspace of $\mathbb{P}n$. The proof will involve a probabilistic counting argument over finite fields.

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