Balanced metrics for Kahler-Ricci solitons and quantized Futaki invariants

摘要

We show that a Kahler-Ricci soliton on a Fano manifold can always be smoothly approximated by a sequence of relative anticanonically balanced metrics, also called quantized KahlerRicci solitons. The proof uses a semiclassical estimate on the spectral gap of an equivariant Berezin transform to extend a strategy due to Donaldson, and can be seen as the quantization of a method due to Tian and Zhu, using quantized Futaki invariants as obstructions for quantized Kahler-Ricci solitons. As corollaries, we recover the uniqueness of Kahler-Ricci solitons up to automorphisms, and show how our result also applies to Kahler-Einstein Fano manifolds with general automorphism group.(c) 2022 Elsevier Inc. All rights reserved.