Convexity of a certain operator trace functional

Eric Evert, Scott McCullough, Tea Štrekelj +1

In this article the operator trace function ${\Lambda }_{r,s}(A)[K,M]:=\mathrm{tr}(K^{\ast }{A}^{r}M{A}^{r}K{)}^s$ is introduced and its convexity and concavity properties are investigated.…