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Self-similar solutions of $σ_k^α$-curvature flow

In this paper, employing a new inequality, we show that under certain curvature pinching condition, the strictly convex closed smooth self-similar solution of $σ_k^α$-flow must be a round sphere. We also obtain a similar result for the solutions of $F=-\langle X, e_{n+1}\rangle \, (*)$ with a non-homogeneous function $F$. At last, we prove that if $F$ can be compared with $\frac{(n-k+1)σ_{k-1}}{kσ_{k}}$, then a closed strictly $k$-convex solution of $(*)$ must be a round sphere.