Majorization conjecture for products of positive semidefinite matrices

Let AA and BB be n×nn\times n positive semidefinite matrices. Let λ(X)\lambda(X) denote the vector of eigenvalues of a Hermitian matrix XX, arranged in decreasing order, and let \succ denote majorization. Majorization conjecture.

λ(A2+BAp)λ(A2+ABp)for all p>0.\lambda(A^2+|BA|^p)\succ\lambda(A^2+|AB|^p)\quad\text{for all }p>0.

If true, this would imply the corresponding determinant inequality for all positive pp and would extend the known cases discussed immediately beforehand. The source reports numerical evidence but leaves the majorization statement as a question.

Sources & referencesView supporting material

Primary source

Minghua Lin, “On a determinantal inequality arising from diffusion tensor imaging”, arXiv:1604.04141 (2016).

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