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arxiv: 1506.00737 · v1 · pith:6N6YI2VWnew · submitted 2015-06-02 · 🧮 math.FA

Remarks on an operator Wielandt inequality

classification 🧮 math.FA
keywords gammaoperatorboundsinequalitymathcalpositivewielandtcomplement
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Let $A$ be a positive operator on a Hilbert space $\mathcal{H}$ with $0<m\leq A\leq M$ and $X$ and $Y$ are two isometries on $\mathcal{H}$ such that $X^{*}Y=0$. For every 2-positive linear map $\Phi$, define $$\Gamma=\left(\Phi(X^{*}AY)\Phi(Y^{*}AY)^{-1}\Phi(Y^{*}AX)\right)^{p}\Phi(X^{*}AX)^{-p}, \, \, \, p>0.$$ We consider several upper bounds for $\frac{1}{2}|\Gamma+\Gamma^{*}|$. These bounds complement a recent result on operator Wielandt inequality.

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