On deformations of hyperbolic varieties

Mario Kummer^a, Eli Shamovich<sup>b

a</sup> Technische Universität Dresden, Fakultät Mathematik, Institut für Geometrie, Zellescher Weg 12-14, 01062 Dresden, Germany
^b Department of Mathematics, Ben-Gurion University of the Negev, Beer-Sheva, Israel

Abstract: In this paper we study flat deformations of real subschemes of $\mathbb{P}^n$, hyperbolic with respect to a fixed linear subspace, i.e., admitting a finite surjective and real fibered linear projection. We show that the subset of the corresponding Hilbert scheme consisting of such subschemes is closed and connected in the classical topology. Every smooth variety in this set lies in the interior of this set. Furthermore, we provide sufficient conditions for a hyperbolic subscheme to admit a flat deformation to a smooth hyperbolic subscheme. This leads to new examples of smooth hyperbolic varieties.

Key words and phrases: hyperbolic variety, Hilbert scheme, deformations.

MSC: Primary 14P99; Secondary 14D99

Language: English

DOI: 10.17323/1609-4514-2021-21-3-593-612

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