On k-ampleness equivalence

Abstract

For a partition $a$ and a vector bundle $E$ on a projective variety $X$ let $\mathcal{F}l_s(E)$ be the corresponding flag manifold. There is a line bundle $\it Q_a^s$ on $\mathcal{F}l_s(E)$ with $p:\mathcal{F}l_s(E)\to X $ and $\it p_*Q_a^s = \mathcal{S}_aE$. We prove, if $\mathcal{S}_aE $ is $k$-ample (in the sense of Sommese) then $\it Q_a^s$ is $k$-ample. For the inverse if $\it Q_a^s$ is $k$-ample, we prove that one of two the conditions of k-ampleness namely the cohomological vanishing is proved here but not yet the condition of semiamplenes of $\mathcal{S}_aE $ .

Theorems & Definitions (12)

• Definition 1.1
• Theorem 2.1
• proof
• Remark 2.2
• Theorem 2.3
• proof
• Lemma 2.4
• Proposition 2.5
• Lemma 2.7
• Lemma 2.8