Title : ( Some operator inequalities involving operator means and positive linear maps )
Authors: Maryam Khosravi , Mohammad Sal Moslehian , Alemeh Sheikhhosseini ,Access to full-text not allowed by authors
Abstract
Let $A$ and $B$ be two positive operators with $0 < m \leqslant A, B \leqslant M$ for positive real numbers $ M, m, \, \sigma$ be an operator mean and $\sigma^{*}$ be the adjoint mean of $ \sigma.$ If $\sigma\leqslant \sigma_1,\sigma_2\leqslant \sigma^*$ and $\Phi$ is a positive unital linear map, then $$\Phi^{p}(A \sigma_{1} B) \leqslant \alpha^{p} \Phi^{p}(A \sigma_{2} B),$$ where $$ \alpha= \max \left \lbrace K, 4^{1-\frac{2}{p}}K \right \rbrace,$$ and $ K= \frac{(M+m)^2}{4mM}$ is the Kantorovich constant. In addition, for $p\geqslant 4$ $$\Phi^{p}(A \sigma_{1} B) \leqslant \dfrac{1}{16}\left (\dfrac{ K(M^{2}+m^{2})}{mM}\right )^{p} \Phi^{p}(A \sigma_{2} B).$$
Keywords
Kantorovich constant; operator mean; operator inequality; positive linear map@article{paperid:1063569,
author = {Maryam Khosravi and Sal Moslehian, Mohammad and Alemeh Sheikhhosseini},
title = {Some operator inequalities involving operator means and positive linear maps},
journal = {Linear and Multilinear Algebra},
year = {2017},
volume = {66},
number = {6},
month = {March},
issn = {0308-1087},
pages = {1186--1198},
numpages = {12},
keywords = {Kantorovich constant; operator mean; operator inequality; positive linear map},
}
%0 Journal Article
%T Some operator inequalities involving operator means and positive linear maps
%A Maryam Khosravi
%A Sal Moslehian, Mohammad
%A Alemeh Sheikhhosseini
%J Linear and Multilinear Algebra
%@ 0308-1087
%D 2017