Ioana Dumitriu

collaborators

2 papers

math.PR2026

BBP Phase Transition for a Doubly Sparse Deformed Model

Ioana Dumitriu, JD Flynn, Zhichao Wang

We prove the equivalent of the Baik, Ben Arous, PÃ©chÃ© (2004) phenomenon for a novel, doubly sparse model where both the Wigner noise matrix and signal vector(s) are sparse. Speci…

math.PR2025

Singular values of sparse random rectangular matrices: Emergence of outliers at criticality

Ioana Dumitriu, Hai-Xiao Wang, Zhichao Wang +1

Consider the random bipartite ErdÅs-RÃ©nyi graph $G (n, m, p)$ , where each edge with one vertex in $V_{1} = [n]$ and the other vertex in $V_{2} = [m]$ is connected with proba…