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arXiv · 2008.13452

Spectral linear matrix inequalities

Mario Kummer
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Abstract

We prove, under a certain representation theoretic assumption, that the set of real symmetric matrices, whose eigenvalues satisfy a linear matrix inequality, is itself a spectrahedron. The main application is that derivative relaxations of the positive semidefinite cone are spectrahedra. From this we further deduce statements on their Wronskians. These imply that Newton's inequalities, as well as a strengthening of the correlation inequalities for hyperbolic polynomials, can be expressed as sums of squares.

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Mario Kummer. 2020-08-31. Spectral linear matrix inequalities. https://doi.org/10.1016/j.aim.2021.107749

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