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We prove a uniform local non-collapsing volume estimate for a large family of singular metrics in the big cohomology classes, which are K\"ahler on an open Euclidean subset of the manifold. The key ingredient is a generalization of a mixed…

Differential Geometry · Mathematics 2026-02-25 Thai Duong Do , Duc-Bao Nguyen , Duc-Viet Vu

Diameter estimates for K\"ahler metrics are established which require only an entropy bound and no lower bound on the Ricci curvature. The proof builds on recent PDE techniques for $L^\infty$ estimates for the Monge-Amp\`ere equation, with…

Differential Geometry · Mathematics 2022-09-21 Bin Guo , Duong H. Phong , Jian Song , Jacob Sturm

We prove a uniform diameter estimate and a uniform local non-collapsing of volumes for a large family of Kaehler metrics generalizing those obtained recently by Guo-Phong-Song-Sturm. We treat also similar questions in the singular setting.

Differential Geometry · Mathematics 2024-06-06 Duc-Viet Vu

We prove uniform gradient and diameter estimates for a family of geometric complex Monge-Ampere equations. Such estimates can be applied to study geometric regularity of singular solutions of complex Monge-Ampere equations. We also prove a…

Differential Geometry · Mathematics 2017-06-07 Xin Fu , Bin Guo , Jian Song

We generalize previous diameter estimates and local non-vanishing of volumes for Kaehler metrics to the case of big cohomology classes. In our proof, among other things, we will prove a uniform diameter estimate for a family of smooth…

Differential Geometry · Mathematics 2024-11-01 Duc-Bao Nguyen , Duc-Viet Vu

We obtain an estimate for the volume of neighbourhoods of sets of large curvature in three-dimensional K\"ahler-Einstein manifolds.

Differential Geometry · Mathematics 2011-04-22 X-X. Chen , S. K. Donaldson

In this paper, we establish diameter bounds for compact K\"ahler manifolds equipped with K\"ahler metrics $\omega$, assuming the associated measure lies in a specific Orlicz space and satisfies an integrability condition. Firstly, we prove…

Differential Geometry · Mathematics 2026-01-16 Lei Zhang , Zhenlei Zhang

Let $(X,\omega)$ be a compact K\"ahler manifold. We prove the existence and uniqueness of solutions to complex Monge-Amp\`ere equations with prescribed singularity type. Compared to previous work, the assumption of small unbounded locus is…

Differential Geometry · Mathematics 2023-09-19 Tamás Darvas , Eleonora Di Nezza , Chinh H. Lu

Uniform $L^\infty$ and H\"older estimates were proved by the Kolodziej for complex Monge-Amp\`ere equations on compact K\"ahler manifolds with $L^p$ volume measure with $p>1$. On the other hand, establishing H\"older estimates on singular…

Complex Variables · Mathematics 2025-08-29 Bin Guo , Slawomir Kolodziej , Jian Song , Jacob Sturm

We prove uniform sup-norm estimates for the Monge-Ampere equation with respect to a family of Kahler metrics which degenerate towards a pull-back of a metric from a lower dimensional manifold. This is then used to show the existence of…

Differential Geometry · Mathematics 2007-10-08 Slawomir Kolodziej , Gang Tian

We prove local smoothing estimates for the massless Dirac equation with a Coulomb potential in 2 and 3 space dimensions. Our strategy of proof is inspired by a paper of Burq et al. (2003) about Schroedinger and wave equations with…

Analysis of PDEs · Mathematics 2023-12-18 Federico Cacciafesta , Eric Séré

We prove a local version of the noncollapsing estimate for mean curvature flow. By combining our result with earlier work of X.-J. Wang, it follows that certain ancient convex solutions that sweep out the entire space are noncollapsed.

Differential Geometry · Mathematics 2022-07-14 Simon Brendle , Keaton Naff

We introduce new families of four-dimensional Ricci solitons of cohomogeneity two with volume collapsing ends. In a local presentation of the metric conformal to a product, we reduce the soliton equation to a degenerate Monge-Amp\`{e}re…

Differential Geometry · Mathematics 2025-11-04 Benjy Firester , Raphael Tsiamis

In this paper, we prove the local gradient estimate for harmonic functions on complete, noncompact Finsler measure spaces under the condition that the weighted Ricci curvature has a lower bound. As applications, we obtain Liouville type…

Analysis of PDEs · Mathematics 2013-12-18 Chao Xia

In this paper, we prove a uniform and sharp estimate for the modulus of continuity of solutions to complex Monge-Amp\`ere equations, using the PDE-based approach developed by the first three authors in their approach to supremum estimates…

Differential Geometry · Mathematics 2021-12-07 Bin Guo , Duong H. Phong , Freid Tong , Chuwen Wang

We obtain a local volume growth for complete, noncompact Riemannian manifolds with small integral bounds and with Bach tensor having finite $L^2$ norm in dimension 4.

Differential Geometry · Mathematics 2007-05-23 Ye Li

We prove a relative $L^\infty$ estimate for a class of complex Monge-Amp\`ere type equations on K\"ahler manifolds. It provides a unified approach to Tundinger type estimate and uniform estimate. It also improves the previous results about…

Differential Geometry · Mathematics 2024-10-08 Junbang Liu

In this article we study the K\"ahler Ricci flow, the corresponding parabolic Monge Amp\`{e}re equation and complete non-compact K\"ahler Ricci flat manifolds. In our main result Theorem \ref{mainthm} we prove that if $(M, g)$ is…

Differential Geometry · Mathematics 2019-02-20 Albert Chau , Luen-Fai Tam

Uniform bounds are obtained using the auxiliary Monge-Amp\`ere equation method for solutions of very general classes of fully non-linear partial differential equations, assuming the existence of a ${C}$-subsolution in the sense of G.…

Analysis of PDEs · Mathematics 2024-01-23 Bin Guo , Duong H. Phong

We prove a local regularity (and a corresponding a priori estmate) for plurisubharmonic solutions of the nondegenerate complex Monge-Amp\'ere equation assuming that their $W^{2,p}$-norm is under control for some $p>n(n-1)$. This condition…

Complex Variables · Mathematics 2010-05-07 Zbigniew Blocki , Slawomir Dinew
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