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The Fuglede-Kadison determinant of matrix-valued semicircular elements and the noncommutative Edmonds' problem

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Authors : Mai, Tobias (Author of the conference)
CIRM (Publisher )

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Abstract : Over the last couple of years, it has become evident that matrix-valued semicircular elements establish strong links between free probability theory and noncommutative algebra. Another surprising connection of this kind was found in a recently finished project with Roland Speicher. We have shown that the Fuglede-Kadison determinant of an arbitrary matrix-valued semicircular element is essentially given by the capacity of its associated covariance map. In addition, we have improved a lower bound by Garg, Gurvits, Oliveira, and Widgerson on this capacity, by making it dimension-independent. Besides analytic tools from operator-valued free probability, these are the crucial ingredients in some novel algorithmic solution to the noncommutative Edmonds' problem which we described in collaboration with Johannes Hoffmann. In my talk, I will present our work and provide the background on free probability and noncommutative algebra required for this purpose.

Keywords : Fuglede-Kadison determinant; operator-valued semicircular elements; capacity; noncommutative Edmonds' problem; free probability theory

MSC Codes :
12E15 - Skew fields, division rings, See also {11R52,11R54,11S45, 16Kxx}
15A22 - Matrix pencils, See also {47A56}
46L54 - Free probability and free operator algebras
65J15 - Equations with nonlinear operators (do not use 65Hxx)

    Information on the Video

    Film maker : Recanzone, Luca
    Language : English
    Available date : 04/11/2024
    Conference Date : 07/10/2024
    Subseries : Research talks
    arXiv category : Operator Algebras ; Functional Analysis ; Rings and Algebras
    Mathematical Area(s) : Algebra ; Analysis and its Applications ; Numerical Analysis & Scientific Computing ; Probability & Statistics
    Format : MP4 (.mp4) - HD
    Video Time : 00:45:48
    Targeted Audience : Researchers ; Graduate Students ; Doctoral Students, Post-Doctoral Students
    Download : https://videos.cirm-math.fr/2024-10-07_mai.mp4

Information on the Event

Event Title : Chaire Jean Morlet - Conference - Algebraic aspects of random matrices / Chaire Jean Morlet - Conference - Aspects algébriques des matrices aléatoires
Event Organizers : Bordenave, Charles ; Capitaine, Mireille ; Chhaibi, Reda ; Collins, Benoît ; Defosseux, Manon ; Demni, Nizar
Dates : 07/10/2024 - 11/10/2024
Event Year : 2024
Event URL : https://conferences.cirm-math.fr/3052.html

Citation Data

DOI : 10.24350/CIRM.V.20255503
Cite this video as: Mai, Tobias (2024). The Fuglede-Kadison determinant of matrix-valued semicircular elements and the noncommutative Edmonds' problem. CIRM. Audiovisual resource. doi:10.24350/CIRM.V.20255503
URI : http://dx.doi.org/10.24350/CIRM.V.20255503

See Also

Bibliography

  • HOFFMANN, Johannes, MAI, Tobias, et SPEICHER, Roland. Computing the noncommutative inner rank by means of operator-valued free probability theory. arXiv preprint arXiv:2308.03667, 2023. - https://doi.org/10.48550/arXiv.2308.03667

  • MAI, Tobias et SPEICHER, Roland. Fuglede-Kadison determinants of matrix-valued semicircular elements and capacity estimates. arXiv preprint arXiv:2406.15922, 2024. - https://doi.org/10.48550/arXiv.2406.15922



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