Higher secants of spinor varieties

Details Higher secants of spinor varieties Higher secants of spinor varieties

2010-11-10

arxiv.org/abs/1011.2337v1

Bollettino U.M.I. (9) IV (2011), 213-235

Mathematics

Algebraic Geometry

23 pages

Scientific paper

Let $S_h$ be the even pure spinors variety of a complex vector space $V$ of even dimension $2h$ endowed with a non degenerate quadratic form $Q$ and let $\sigma_k(S_h) $ be the $k$-secant variety of $S_h$. We decribe a probabilistic algorithm which computes the complex dimension of $\sigma_k(S_h) $. Then, by using an inductive argument, we get our main result: $\sigma_3(S_h) $ has the expected dimension except when $h\in \{7,8\} $. Also we provide theoretical arguments which prove that $S_7$ has a defective 3-secant variety and $S_8$ has defective 3-secant and 4-secant varieties.

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