Sparse sum of Hermitian squares in group algebras of finite groups

Jianting Yang; Ke Ye; Lihong Zhi

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arXiv · 2207.08076

Sparse sum of Hermitian squares in group algebras of finite groups

Jianting Yang·Ke Ye·Lihong Zhi

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Abstract

Nonnegative elements in group algebras play a central role in harmonic analysis, operator algebras, and computational optimization. This paper investigates sparse sum-of-Hermitian-squares (SOHS) representations of nonnegative elements in the group algebras of finite groups. We prove that the convex relaxation of the sparse SOHS problem admits a closed-form solution, namely the square root of the given element. Based on this result, we propose a thresholding hierarchy for approximating sparse SOHS representations. We analyze the error of this hierarchy with respect to two natural residuals and establish exponential decay rates. Remarkably, one error bound is independent of the group order, and the other is also group-size independent when the group is cyclic or dihedral. These results extend existing work on Fourier sums of squares for abelian groups to a broader class of finite groups and provide new algorithmic tools for sparse noncommutative positivity certificates.

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BibTeX RIS

Jianting Yang, Ke Ye, Lihong Zhi. 2022-07-17. Sparse sum of Hermitian squares in group algebras of finite groups. https://arxiv.org/abs/2207.08076

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