Positive Cones of the Projectivization of a parabolic vector bundle and Their Products over a Curve

We compute the positive cones of the projectivization of a parabolic vector bundle and the fiber product of two parabolic projective bundles over a smooth complex projective curve.

Specifically, we determine their Néron--Severi groups and compute their nef and pseudoeffective cones.

Moreover, for the projectivization of a parabolic vector bundle, we explicitly describe the generators of the higher nef and pseudoeffective cones.

As an application, we obtain a necessary and sufficient criterion for the semistability of a parabolic vector bundle.