Hayk Mikayelyan
The method proposed by T. I. Zelenjak is applied to the mean curvature flow in the plane. A new type of monotonicity formula for star-shaped curves is obtained.
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We apply the stabilization technique, developed by T. Zelenyak in 1960s for parabolic equations, on curve shortening flow in $\R^3$, and derive several new monotonicity formulas. All of them share one main feature: the dependence of the "energy" term on the angle between the position vector and the plane orthogonal to the tangent vector. The first formula deals with the projection of the curve on the unit sphere, and computes the derivative of its length. The second formula is the generalization of the classical formula of G. Huisken, while the third one is the generalization of the monotonici…
In this paper, we study a family of curves on $S^2$ that defines a two-dimensional smooth projective plane. We use curve shortening flow to prove that any two-dimensional smooth projective plane can be smoothly deformed through a family of smooth projective planes into one which is isomorphic to the real projective plane. In addition, as a consequence of our main result, we show that any two smooth embedded curves on $RP^2$ which intersect transversally at exactly one point converge to two different geodesics under the flow.
We study the area preserving curve shortening flow with Neumann free boundary conditions outside of a convex domain in the Euclidean plane. Under certain conditions on the initial curve the flow does not develop any singularity, and it subconverges smoothly to an arc of a circle sitting outside of the given fixed domain and enclosing the same area as the initial curve.
We formulate a uniqueness conjecture for curve shortening flow of proper curves on certain symmetric surfaces and give an example of a non-flat metric on the plane with respect to which curve shortening flow is not unique. That is, with respect to a suitably chosen metric, we construct a non-static solution to curve shortening flow starting from a properly embedded geodesic.
In this paper we explore the nature of self-similar solutions of the Curve Shortening Flow and the Vortex Filament Equation, also known as the Binormal Flow. We explore some of their fundamental conservation properties and describe the behavior of their self-similar solutions. For Curve Shortening Flow we mainly expose the results of Huisken, Grayson, and Halldorsson concerning the equation's basic properties and self-similar solutions in the plane. For the Vortex Filament Equation we present the results by Banica and Vega, Arms and Hama, and Hasimoto. We also derive the evolution equations of…
Monotonicity of the modulus under curve shortening flow
研究了平面中两个嵌入的闭曲线在曲线缩短流下的模长单调性，证明其随时间递增，并推广到满足下曲率界的 ambient 表面。
We consider a network in the Euclidean plane that consists of three distinct half-lines with common start points. From that network as initial condition, there exists a network that consists of three curves that all start at one point, where they form 120 degree angles, and expands homothetically under curve shortening flow. We also prove uniqueness of these networks.
Lectures on curve shortening flow
本文通过曲线缩短流的几何热方程，展示非线性偏微分方程中的最大原理估计、单调性公式、Harnack不等式和奇点分析等核心方法，阐述Huisken证明Grayson定理的过程，即任何平面闭合嵌入曲线最终收缩为一个圆点。
In this paper we are concerned with a initial boundary-value problem for a coupled system of two KdV equations, posed on the positive half line, under the effect of a localized damping term. The model arises when modeling the propagation of long waves generated by a wave maker in a channel. It is shown that the solutions of the system are exponential stable and globally well-posed in the weighted space $L^2(e^{2bx}dx)$ for $b>0$. The stabilization problem is studied using a Lyapunov approach while the well-posedness result is obtained combining fixed point arguments and energy type estimates.
The Harnack inequality without convexity for curve shortening flow
本文提出了一种无需凸性假设的曲线缩短流哈纳克不等式，用于分析曲线演化过程中的正则性及图形化时间。
In this paper we introduce a geometric quantity, the $r$-multiplicity, that controls the length of a smooth curve as it evolves by curve shortening flow. The length estimates we obtain are used to prove results about the level set flow in the plane. If $K$ is locally-connected, connected and compact, then the level set flow of $K$ either vanishes instantly, fattens instantly or instantly becomes a smooth closed curve. If the compact set in question is a Jordan curve $J$, then the proof proceeds by using the $r$-multiplicity to show that if $γ_n$ is a sequence of smooth curves converging unifor…
Curve shortening flow with an ambient force field
本文研究了环境力场下平面各向异性曲线缩短流，证明了高曲率闭合嵌入曲线收缩至圆点，并给出环境力场使初始凸曲线最终变非凸的充分条件。
With few exceptions, known explicit solutions of the curve shortening flow (CSE) of a plane curve, can be constructed by classical Lie point symmetry reductions or by functional separation of variables. One of the functionally separated solutions is the exact curve shortening flow of a closed, convex "oval"-shaped curve and another is the smoothing of an initial periodic curve that is close to a square wave. The types of anisotropic evaporation coefficient are found for which the evaporation-condensation evolution does or does not have solutions that are analogous to the basic solutions of the…
Which shapes can appear in a Curve Shortening Flow Singularity?
本文研究平面曲线缩短流奇点中可能出现的缠结，提出 n-环曲线并猜想其渐近收敛于挤压蝴蝶结，通过形式分析和数值模拟提供支持。
Using area-preserving curve shortening flow, and a new inequality relating the potential generated by a set to its curvature, we study a non-local isoperimetric problem which arises in the study of di-block copolymer melts, also referred to as the Ohta-Kawasaki energy. We are able to show that the only connected critical point is the ball under mild assumptions on the boundary, in the small energy/mass regime. In particular this class includes all rectifiable, connected 1-manifolds in $\mathbb{R}^2$. We also classify the simply connected critical points on the torus in this regime, showing the…
Grim Raindrop: A Translating Solution to Curve Diffusion Flow
本文证明了平面中曲线扩散流存在一个正则浸入的平移解，并指出该流是曲线缩短流的高阶版本。
The continuity of curvature flow in Fréchet distance
本文研究平面Jordan曲线在曲率流及水平集流下的演化，证明其演化在Fréchet距离下连续依赖于初始曲线。
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