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math.OC2021
The cone of completely positive matrices
Max Pfeffer, Jose Alejandro Samper
We study the cone of completely positive (cp) matrices for the first interesting case . This is a semialgebraic set, which means that the polynomial equalities and inequliti…
math.NA2021
Particle Number Conservation and Block Structures in Matrix Product States
Markus Bachmayr, Michael Götte, Max Pfeffer
The eigenvectors of the particle number operator in second quantization are characterized by the block sparsity of their matrix product state representations. This is shown to gene…
math.OC2021
Riemannian thresholding methods for row-sparse and low-rank matrix recovery
Henrik Eisenmann, Felix Krahmer, Max Pfeffer +1
In this paper, we present modifications of the iterative hard thresholding (IHT) method for recovery of jointly row-sparse and low-rank matrices. In particular a Riemannian version…