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Heat kernel and curvature bounds in Ricci flows with bounded scalar curvature
Richard H. Bamler,Qi S. Zhang +1 more
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In this article, the authors analyzed Ricci flows on which the scalar curvature is globally or locally bounded from above by a uniform or time-dependent constant, and established a new time-derivative bound for solutions to the heat equation.Abstract:
In this paper we analyze Ricci flows on which the scalar curvature is globally or locally bounded from above by a uniform or time-dependent constant. On such Ricci flows we establish a new time-derivative bound for solutions to the heat equation. Based on this bound, we solve several open problems: 1. distance distortion estimates, 2. the existence of a cutoff function, 3. Gaussian bounds for heat kernels, and, 4. a backward pseudolocality theorem, which states that a curvature bound at a later time implies a curvature bound at a slightly earlier time.
Using the backward pseudolocality theorem, we next establish a uniform $L^2$ curvature bound in dimension 4 and we show that the flow in dimension 4 converges to an orbifold at a singularity. We also obtain a stronger $\varepsilon$-regularity theorem for Ricci flows. This result is particularly useful in the study of Kahler Ricci flows on Fano manifolds, where it can be used to derive certain convergence results.read more
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On the constant scalar curvature Kähler metrics (I)—A priori estimates
Xiuxiong Chen,Jingrui Cheng +1 more
TL;DR: In this article, the authors derived apriori estimates for constant scalar curvature K\\\"ahler metrics on a compact K\\´ahler manifold, and showed that higher order derivatives can be estimated in terms of a $C^0$ bound for the K\\''ahler potential.
Journal ArticleDOI
On the constant scalar curvature Kähler metrics (II)—Existence results
Xiuxiong Chen,Jingrui Cheng +1 more
TL;DR: In this paper, the authors generalize their apriori estimates on cscK(constant scalar curvature K\\\"ahler) metric equation to more general curvature type equations (e.g., twistedcscK metric equation) under the assumption that the automorphism group is discrete.
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Convergence of Ricci flows with bounded scalar curvature
TL;DR: In this article, it was shown that Ricci flows with bounded scalar curvature and entropy converge smoothly away from a singular set of codimension in the Riemannian case.
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Entropy and heat kernel bounds on a Ricci flow background
TL;DR: New geometric and analytic bounds for Ricci flows are established and imply a local $\varepsilon$-regularity theorem, improving a result of Hein and Naber.
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Structure theory of non-collapsed limits of Ricci flows
TL;DR: In this paper, the authors characterize noncollapsed limits of Ricci flows and show that these limits are smooth away from a set of codimension in the parabolic sense and that the tangent flows at every point are given by gradient shrinking solitons.
References
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The entropy formula for the Ricci flow and its geometric applications
TL;DR: In this article, a monotonic expression for Ricci flow, valid in all dimensions and without curvature assumptions, is presented, interpreted as an entropy for a certain canonical ensemble.
Journal ArticleDOI
Three-manifolds with positive Ricci curvature
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On the parabolic kernel of the Schrödinger operator
Peter Li,Shing-Tung Yau +1 more
TL;DR: Etude des equations paraboliques du type (Δ−q/x,t)−∂/∂t)u(x, t)=0 sur une variete riemannienne generale as discussed by the authors.
Book
Heat Kernel and Analysis on Manifolds
TL;DR: In this article, the Laplace operator and the heat equation on a Riemannian manifold were studied in the context of regularity theory and spectral properties of distance functions and completeness.
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Heat kernel and curvature bounds in Ricci flows with bounded scalar curvature
Richard H. Bamler,Qi S. Zhang +1 more