Kähler-Ricci Flow on Projective Bundles over Kähler-Einstein Manifolds

Details Kähler-Ricci Flow on Projective Bundles over Kähler-Einstein Manifolds Kähler-Ricci Flow on Projective Bundles over Kähler-Einstein Manifolds

2011-04-20

arxiv.org/abs/1104.3924v2

Mathematics

Differential Geometry

revised version for publication, to appear in Trans. Amer. Math. Soc

Scientific paper

We study the K\"ahler-Ricci flow on a class of projective bundles $\mathbb{P}(\mathcal{O}_\Sigma \oplus L)$ over compact K\"ahler-Einstein manifold $\Sigma^n$. Assuming the initial K\"ahler metric $\omega_0$ admits a U(1)-invariant momentum profile, we give a criterion, characterized by the triple $(\Sigma, L, [\omega_0])$, under which the $\mathbb{P}^1$-fiber collapses along the K\"ahler-Ricci flow and the projective bundle converges to $\Sigma$ in Gromov-Hausdorff sense. Furthermore, the K\"ahler-Ricci flow must have Type I singularity and is of $(\C^n \times \mathbb{P}^1)$-type. This generalizes and extends part of Song-Weinkove's work \cite{SgWk09} on Hirzebruch surfaces.

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