Casorati inequalities for Riemannian submersion along mixed distributions and their applications

This paper introduces Casorati inequalities for the normalised scalar curvature and normalised Casorati curvature of vertical and horizontal distributions for Riemannian submersions between Riemannian manifolds. We completely characterise the equality cases from both algebraic and geometric perspectives. As applications, we derive the corresponding inequalities for Riemannian submersions from real, complex, and generalised Sasakian space forms, including Sasakian, cosymplectic, Kenmotsu, and almost $C(\alpha)$ space forms. We provide several examples to demonstrate the effectiveness and applicability of the results obtained.