Asymptotic Positivity of Hurwitz Product Traces

Abstract

Consider the polynomial $tr(A+tB{)}^m$ in $t$ for positive hermitian matrices $A$ and $B$ with $m\in \mathbb{N}$. The Bessis-Moussa-Villani conjecture (in the equivalent form of Lieb and Seiringer) states that this polynomial has nonnegative coefficients only. We prove that they are at least asymptotically positive, for the nontrivial case of $AB\ne 0$. More precisely, we show that the $k$-th coefficient is positive for all integer $m\ge m_0$, where $m_0$ depends on $A$, $B$ and $k$.

18 pages, LaTeX

References in corpus (1)

• Proof of the cases $p\le 7$ of the Lieb-Seiringer formulation of the Bessis-Moussa-Villani conjecture

Cited by in corpus (2)

• Remarks on BMV conjecture
• Asymptotic Positivity of Hurwitz Product Traces: Two Proofs