Constant $k$th-mixed curvature on locally conformal Kähler manifolds

In this paper, we consider compact locally conformal Kähler manifolds with constant $k$th-mixed curvature. By using a recent method of Huang-Wan for constant Chern holomorphic sectional curvature, we prove that if a compact LCK manifold has nonzero constant $k$th-mixed curvature, then its Hermitian metric is Kähler. For the second mixed curvature, the same conclusion also holds when the curvature constant is zero. We also study some special parameters related to the general constant mixed curvature conjecture. In particular, we obtain a torsion-energy identity and a sign obstruction for compact Hermitian manifolds, and characterize an exceptional Kähler case by Bochner–Kähler geometry.