Quartic Spectrahedra
Optimization and Control
2014-11-10 v2 Algebraic Geometry
Abstract
Quartic spectrahedra in 3-space form a semialgebraic set of dimension 24. This set is stratified by the location of its ten nodes. There are twenty maximal strata, identified recently by Degtyarev and Itenberg, via the global Torelli Theorem for real K3 surfaces. We here give a new proof that is self-contained and algorithmic. This involves extending Cayley's characterization of quartic symmetroids, by the property that the branch locus of the projection from a node consists of two cubic curves. This paper represents a first step towards the classification of all spectrahedra of a given degree and dimension.
Cite
@article{arxiv.1311.3675,
title = {Quartic Spectrahedra},
author = {John Christian Ottem and Kristian Ranestad and Bernd Sturmfels and Cynthia Vinzant},
journal= {arXiv preprint arXiv:1311.3675},
year = {2014}
}
Comments
28 pages, 9 figures