Hyperbolic Secant Varieties of M-Curves

Abstract

We relate the geometry of curves to the notion of hyperbolicity in real algebraic geometry. A hyperbolic variety is a real algebraic variety that (in particular) admits a real fibered morphism to a projective space whose dimension is equal to the dimension of the variety. We study hyperbolic varieties with a special interest in the case of hypersurfaces that admit a real algebraic ruling. The central part of the paper is concerned with secant varieties of real algebraic curves where the real locus has the maximal number of connected components, which is determined by the genus of the curve. For elliptic normal curves, we further obtain definite symmetric determinantal representations for the hyperbolic secant hypersurfaces, which implies the existence of symmetric Ulrich sheaves of rank one on these hypersurfaces.

arXiv comment32 pages, 2 figures; Comments welcome!

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Cited by in corpus (3)

• Ulrich sheaves, the arithmetic writhe and algebraic isotopies of space curves
• Positive Ulrich Sheaves
• A Real Generalized Trisecant Trichotomy