Teodor Oprea
As we showed in [3], a geometric inequality can be regarded as an optimization problem. In this paper we find another proof for a Chen's inequality,regarding the Ricci curvature [2] and we improve this inequality in the Lagrangian case.
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A generalization of the affine-geometric Wirtinger inequality for curves to hypersurfaces is given.
We give a geometric interpretation of the linear trace Harnack inequality for the Ricci flow.
In this paper, we use the inverse curvature flow to prove a sharp geometric inequality on star-shaped and two-convex hypersurface in hyperbolic space.
We give a geometric interpretation of Hamilton's matrix Harnack inequality for the Ricci flow as the curvature of a connection on space-time.
We use the inverse mean curvature flow with a free boundary perpendicular to the sphere to prove a geometric inequality involving the Willmore energy for convex hypersurfaces of dimension $n\geq 3$ with boundary on the sphere.
Gradient estimates and Harnack inequality for positive solutions to the heat equation under compact Finsler $CD(-K,N)$ geometric flows
本文在紧致Finsler $CD(-K,N)$几何流框架下推广热方程正解的整体梯度估计，并建立相应的Harnack不等式。
We provide a new proof of the following inequality: the maximum curvature $k_\mathrm{max}$ and the enclosed area $A$ of a smooth Jordan curve satisfy $k_\mathrm{max}\ge \sqrt{π/A}$. The feature of our proof is the use of the curve shortening flow.
A sharp geometric inequality for closed hypersurfaces in manifolds with asymptotically nonnegative curvature
本文利用黎曼几何标准比较方法，在渐近非负曲率的完备非紧流形中为闭超曲面建立了锐利几何不等式，并简化了非负里奇曲率情形下Willmore型不等式的证明。
Through the study of some elliptic and parabolic fully nonlinear PDEs, we establish conformal versions of quermassintegral inequality, the Sobolev inequality and the Moser-Trudinger inequality for the geometric quantities associated to the Schouten tensor on locally conformally flat manifolds.
In this paper, we prove that associated with a sub-static asymptotically flat manifold endowed with a harmonic potential there is a one-parameter family $\{F_β\}$ of functions which are monotone along the level-set flow of the potential. Such monotonicity holds up to the optimal threshold $β=\frac{n-2}{n-1}$ and allows us to prove a geometric capacitary inequality where the capacity of the horizon plays the same role as the ADM mass in the celebrated Riemannian Penrose Inequality.
A new proof of the Willmore inequality via a divergence inequality
本文通过散度形式的几何微分不等式推导出涉及静电势的参数化几何不等式，从而为任意光滑边界有界域的 Willmore 不等式提供了新证明，并推广至定量 Willmore 型与加权 Minkowski 不等式。
We prove that if the unit codisc bundle of a closed Riemannian manifold embeds symplectically into a symplectic cylinder of radius one then the length of the shortest nontrivial closed geodesic is at most half the area of the unit disc.
A sharp quantitative Alexandrov inequality and applications to volume preserving geometric flows in 3D
本文研究三维保体积平均曲率流和 Mullins-Sekerka 流的渐近行为，并建立了带周长界的 $C^2$ 集合的尖锐定量 Alexandrov 不等式，为其应用提供理论基础。
In this expository paper, we discuss some of the main geometric inequalities for minimal hypersurfaces. These include the classical monotonicity formula, the Alexander-Osserman conjecture, the isoperimetric inequality for minimal surfaces, and the Michael-Simon Sobolev inequality.
Geometric inequalities and the Alexandrov-Bakelman-Pucci technique
本文基于Alexandrov-Bakelman-Pucci技术，统一讨论了几何不等式的证明框架，涵盖欧几里得空间的等周不等式、子流形的均曲率不等式及Sobolev不等式等核心方法与贡献。
A proof of the reverse isoperimetric inequality using a geometric-analytic approach
本文通过几何-分析方法证明了爱因斯坦引力中黑洞的反等周不等式，揭示了引力在AdS黑洞视界反等周性质中的核心作用。
Geometric inequalities and rigidity of gradient shrinking Ricci solitons
该研究证明完备梯度收缩 Ricci 孤立子上六类几何不等式与热核估计等价存在，并给出紧致情形下的积分间隙刚性结果。
Recently, we have shown that there do not exist the warped product semi-slant submanifolds of cosymplectic manifolds [10]. As nearly cosymplectic structure generalizes cosymplectic ones same as nearly Kaehler generalizes Kaehler structure in almost Hermitian setting. It is interesting that the warped product semi-slant submanifolds exist in nearly cosymplectic case while in case of cosymplectic do not exist. In the beginning, we prove some preparatory results and finally we obtain an inequality such as $\|h\|^2 \geq 4q\csc^2θ\{1+\frac{1}{9}\cos^2θ\}\|\nabla \ln f\|^2$ in terms of intrinsic and…
We generalize Brendle's geometric inequality considered in \cite{B} to static manifolds. The inequality bounds the integral of inverse mean curvature of an embedded mean-convex hypersurface by geometric data of the horizon. As a consequence, we obtain a reverse Penrose inequality on static asymptotically locally hyperbolic manifolds in the spirit of Chruściel and Simon \cite{CS}.
In this article, we prove a geometric inequality for star-shaped and mean-convex hypersurfaces in hyperbolic space by inverse mean curvature flow. This inequality can be considered as a generalization of Willmore inequality for closed surface in hyperbolic $3$-space.
The Wintgen inequality (1979) is a sharp geometric inequality for surfaces in the 4-dimensional Euclidean space involving the Gauss curvature (intrinsic invariant) and the normal curvature and squared mean curvature (extrinsic invariants), respectively. In the present paper we obtain a Wintgen inequality for statistical surfaces.
Remark on a geometric inequality for closed hypersurfaces in weighted manifolds
本文在具有非负Bakry-Émery里奇曲率的非紧加权流形中建立闭超曲面的最优几何不等式，刻画了$N=\infty$情形的刚性条件，推广了经典Willmore型不等式。
In this paper, we deals with isoperimetric-type inequalities for closed convex curves in the Euclidean plane R^2. We derive a family of parametric inequalities involving the following geometric functionals associated to a given convex curve with a simple Fourier series proof: length, area of the region included by the curve, area of the domain enclosed by the locus of curvature centers and integral of the radius of curvature. By using our isoperimetric-type inequalities, we also obtain some new geometric Bonnesen-type inequalities. Furthermore we investigate stability properties of such inequa…
In this short note we establish an integral geometric inequality in a smooth metric measure space of the nonnegative Bakry-Émery Ricci curvature. This result can be regarded as a mild generalization of the almost Schur theorem due to De Lellis and Topping (Calc. Var., DOI: 10.1007/s00526-011-0413-z).
Geometric inequalities for quasi-Einstein manifolds
本文利用广义Reilly公式研究拟爱因斯坦流形，建立了带边界紧致流形的边界估计、等周型及Heintze-Karcher型不等式。
We give a proof of Gaussian upper bound for the heat kernel coupled with the Ricci ow. Previous proofs by Lei Ni [5] use Harnack inequality and doubling volume property, also the recent proof by Zhang and Cao [6] uses Sobolev type inequality that is conserved along Ricci ow. We will use a horizontal coupling of curve [1] Arnaudon Thalmaier, C., in order to generalize Harnack inequality with power -for inhomogeneous heat equation - introduced by F.Y Wang. In the case of Ricci ow, we will derive on-diagonal bound of the Heat kernel along Ricci ow (and also for the usual Heat kernel on complete M…
We propose a geometric inequality for two-dimensional spacelike surfaces in the Schwarzschild spacetime. This inequality implies the Penrose inequality for collapsing dust shells in general relativity, as proposed by Penrose and Gibbons. We prove that the inequality holds in several important cases.
Some geometric inequalities by the ABP method
本文运用ABP方法证明了极小子流形的对数Sobolev不等式、正对称张量的Sobolev型不等式及闭超曲面quermassintegrals相关不等式，推广了经典结果。
We prove that monotonicity of density and energy inequality imply the rectifiability of the singular sets for Yang-Mills flow.
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