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Journal article
Globally trace-positive noncommutative polynomials and the unbounded tracial moment problem
MATHEMATISCHE ANNALEN
19 Oct 2022
Abstract
A noncommutative (nc ) polynomial is called (globally) trace-positive if its evaluation at any tuple of operators in a tracial von Neumann algebra has nonnegative trace. Such polynomials emerge as trace inequalities in several matrix or operator variables, and are widespread in mathematics and physics. This paper delivers the first Positivstellensatz for global trace positivity of nc polynomials. Analogously to Hilbert's 17th problem in real algebraic geometry, trace-positive nc polynomials are shown to be weakly sums of hermitian squares and commutators of regular nc rational functions. In two variables, this result is strengthened further using a new sum-of-squares certificate with concrete univariate denominators for nonnegative bivariate polynomials. The trace positivity certificates in this paper are obtained by convex duality through solving the so-called unbounded tracial moment problem, which arises from noncommutative integration theory and free probability. Given a linear functional on nc polynomials, the tracial moment problem asks whether it is a joint distribution of integral operators affiliated with a tracial von Neumann algebra. A counterpart to Haviland's theorem on solvability of the tracial moment problem is established. Moreover, a variant of Carleman's condition is shown to guarantee the existence of a solution to the tracial moment problem. Together with semidefinite optimization, this is then used to prove that every trace-positive nc polynomial admits an explicit approximation in the 1-norm on its coefficients by sums of hermitian squares and commutators of nc polynomials.
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Details
- Title
- Globally trace-positive noncommutative polynomials and the unbounded tracial moment problem
- Publication Details
- MATHEMATISCHE ANNALEN
- Publisher
- SPRINGER HEIDELBERG; HEIDELBERG
- Grant note
- Supported by the Slovenian Research Agency Grants J1-2453, N1-0217, J1-3004 and P1-0222, Supported by DFG Grant SCHE281/10-2, Supported by Villum Fonden via the Villum Young Investigator Grant (no. 37532), the National Science Foundation Grant DMS-1954709, and the Slovenian Research Agency Grants J1-3004 and P1-0222.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000870089500001
- Scopus ID
- 2-s2.0-85140134016
- Other Identifier
- 991021861169704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Mathematics