Armine Bagyan

activity

20222025

collaborators

5 papers

math.ST2025

Random Linear Modulation with Spherically Symmetric Modulators

Armine Bagyan, Donald Richards

We consider the modulation of data given by random vectors $X_{n} \in R^{d_{n}}$ , $n \in N$ . For each $X_{n}$ , one chooses an independent modulating random vector $Ξ_n…

math.ST2024

Complete Asymptotic Expansions for the Normalizing Constants of High-Dimensional Matrix Bingham and Matrix Langevin Distributions

Armine Bagyan, Donald Richards

For positive integers $d$ and $p$ such that $d \geq p$ , let $R^{d \times p}$ denote the set of $d \times p$ real matrices, $I_{p}$ be the identity matrix of order $p$ , and $V…

math.ST2023

Complete Asymptotic Expansions and the High-Dimensional Bingham Distributions

Armine Bagyan, Donald Richards

For $d \geq 2$ , let $X$ be a random vector having a Bingham distribution on $S^{d - 1}$ , the unit sphere centered at the origin in $R^{d}$ , and let $Σ$ denote the symmetric m…

stat.AP2022

A Continuous-Time Markov Chain Model for the Spread of COVID-19

Armine Bagyan, Donald Richards

Since late 2019 the novel coronavirus, also known as COVID-19, has caused a pandemic that persists. This paper shows how a continuous-time Markov chain model for the spread of COVI…

math.PR2022

Hoffmann-Jørgensen Inequalities for Random Walks on the Cone of Positive Definite Matrices

Armine Bagyan, Donald Richards

We consider random walks on the cone of $m \times m$ positive definite matrices, where the underlying random matrices have orthogonally invariant distributions on the cone and the…