Images of toric variety and amplified endomorphism of weak Fano threefolds

We show that some important classes of weak Fano $3$-folds of Picard rank $2$ do not satisfy Bott vanishing.

Using this we show that any smooth projective $3$-fold $X$ of Picard rank $2$ with $-K_X$ nef which is the image of a projective toric variety is toric.

This proves a special case of a conjecture by Ochetta-Wisniewski, extending a corresponding previous work for Fano $3$-folds.

We also show that a weak Fano $3$-fold of Picard rank $2$ having an int-amplified endomorphism is toric.

This proves a special case of a conjecture by Fakhrudding, Meng, Zhang and Zhong, extending corresponding previous work for Fano $3$-folds.