Hodge Laplacian and geometry of Kuranishi family of Fano manifolds

Abstract

We first obtain eigenvalue estimates for the Hodge Laplacian on Fano manifolds, which follow from the Bochner-Kodaira formula. Then we apply it to study the geometry of the Kuranishi family of deformations of Fano manifolds. We show that the original Kähler form remains to be a Kähler form for other members of the Kuranishi family, and give an explicit formula of the Ricci potential. We also show that our set-up gives another account for the Donaldson-Fujiki picture.

Typos were fixed, and the third author's email address was renewed. To appear in Kyoto Journal of Mathematics