Seokchang Hong
We study the failure of the smoothness of flow maps for the $(1+3)$ dimensional Yang-Mills system in the Lorenz gauge by Knapp type counterexamples. This shows a gap between the scaling critical regularity exponents and the best attainable regularity via Picard's iteration in the Yang-Mills system under the Lorenz gauge condition.
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The Yang-Mills-Higgs equations (Y-M-H), when written relative to Lorenz gauge, become a system of nonlinear wave equations. The key bilinear terms in the resulting system turn out to be null forms--this is in light of a recent discovery of null structure by Selberg and the present author for Yang-Mills equations in Lorenz gauge. Using the null structure found and bilinear space-time estimates, we prove local well-posedness of Y-M-H in Lorenz gauge for finite energy data.
In this paper, we prove the local well-posedness of the Yang-Mills system in the Lorenz gauge for initial data in the Besov space $B^\frac12_{2,1}\times B^{-\frac12}_{2,1}$ with additional angular regularity. To the best of our knowledge, our study is the first result on $(1+3)$ dimensional Yang-Mills system with initial data in the scaling critical regularity.
We demonstrate null structure in the Yang-Mills equations in Lorenz gauge. Such structure was found in Coulomb gauge by Klainerman and Machedon, who used it to prove global well-posedness for finite-energy data. Compared with Coulomb gauge, Lorenz gauge has the advantage---shared with the temporal gauge---that it can be imposed globally in space even for large solutions. Using the null structure and bilinear space-time estimates, we also prove local-in-time well-posedness of the equations in Lorenz gauge, for data with finite energy. The time of existence depends on the initial energy and on t…
In this paper, we study the local well-posedness of the $(1+3)$-dimensional Yang-Mills-Higgs (YMH) and the Yang-Mills-Dirac (YMD) system in the Lorenz gauge. Since there is some bilinear term in (YMH), which is a lack of null structure, one may obtain the well-posedness at most the energy space. However, we attain the scaling critical regularity of (YMH) by imposing the extra weighted regularity in the angular variables. In (YMD), for the coupled system to persist in time, it is required to impose the angular regularity on the Dirac spinor as much as the Yang-Mills gauge potential and curvatur…
We prove that the Yang-Mills equation in Lorenz gauge in the (n+1)-dimensional case is locally well-posed for data of the gauge potential in $H^s$ and the curvature in $H^r$ , where $s >\frac{n}{2}-\frac{7}{8}$ , $r > \frac{n}{2}-\frac{7}{4}$ , if $n \ge 4$, and $ s > \frac{3}{4}$ , $ r > - \frac{1}{8}$ , if $n=3$. The proof is based on the fundamental results of Klainerman-Selberg [KS] and on the null structure of most of the nonlinear terms detected by Selberg-Tesfahun [ST] and Tesfahun [Te].
We prove that the Yang-Mills equations in the Lorenz gauge (YM-LG) is locally well-posed for data below the energy norm, in particular, we can take data for the gauge potential $A$ and the associated curvature $F$ in $H^s\times H^{s-1}$ and $H^r\times H^{r-1}$ for $s=(\frac67+,-\frac1{14} +)$, respectively. This extends a recent by Selberg and the present author on the local well-posedness of YM-LG for finite energy data (specifically, for $(s, r)=(1-, 0)$). We also prove unconditional uniqueness of the energy class solution, that is, uniqueness in the classical space $C([-T, T]; X_0)$, where …
In this paper, we consider the Cauchy problem of local well-posedness of the Chern-Simons-Dirac system in the Lorenz gauge for $B^{\frac14}_{2,1}$ initial data. We improve the low regularity well-posedness, compared to Huh-Oh \cite{huhoh} and Okamoto \cite{oka}, by using the localization of space-time Fourier side and bilinear estimates given by Selberg \cite{selb}, whereas the authors of \cite{huhoh, oka} used global estimates of \cite{danfoselb}. Then we show the Dirac spinor flow of Chern-Simons-Dirac system is not $C^2$ at the origin in $H^s$ if $ s < \frac14$. From this point of view, the…
Overview of the proof of the exterior stability of the $(1+3)$-Minkowski space-time governed by the Einstein-Yang-Mills system in the Lorenz gauge
本文在Lorenz规范下证明了取值于任意Lie代数的完全耦合Einstein-Yang-Mills系统支配的Minkowski时空外部稳定性，利用零标架分解方法处理不满足零条件的非线性困难，并证明小初值解收敛到零Yang-Mills场和Minkowski时空。
We consider the classical Yang-Mills system coupled with a Dirac equation in 3+1 dimensions in temporal gauge. Using that most of the nonlinear terms fulfill a null condition we prove local well-posedness for small data with minimal regularity assumptions. This problem for smooth data was solved forty years ago by Y. Choquet-Bruhat and D. Christodoulou. The corresponding problem in Lorenz gauge was considered recently by the author in [P1].
The global stability of the Minkowski space-time solution to the Einstein-Yang-Mills equations in higher dimensions
本文证明高维（n≥5）闵可夫斯基时空在洛伦兹规范下作为爱因斯坦-杨-米尔斯系统解的整体稳定性，并给出色散估计，为后续低维情形研究奠定基础。
Exterior stability of the $(1+3)$-dimensional Minkowski space-time solution to the Einstein-Yang-Mills equations
本文证明爱因斯坦-杨-米尔斯方程闵可夫斯基时空解的外部稳定性，通过零标架分解在Lorenz和调和规范下建立适定性并得到色散估计，为已有结果提供新证明。
We continue here with previous investigations on the global behavior of general type non-linear wave equations for a class of small, scale-invariant initial data. The method is based on the use of a new set of Strichartz estimates for the linear wave equation which incorporates extra weighted smoothness assumptions with respect to the angular variable, along with the construction of appropriate micro-local function spaces which take into account this type of additional regularity.
Energy estimates for the Einstein-Yang-Mills fields and applications
本文为张量非线性波动方程建立外部能量估计，并应用于证明闵可夫斯基时空在爱因斯坦-杨-米尔斯系统下的外部稳定性，为后续$(1+3)$维情形奠定基础。
Infinite time bubbling for the $SU(2)$ Yang-Mills heat flow on $\mathbb{R}^4$
研究 $\mathbb{R}^4$ 上 $SU(2)$ 丛的 Yang-Mills 热流的长时间行为，构造了两种无限时间气泡解：单点爆破和气泡塔，表明梯度流不一定收敛到 Yang-Mills 连接。
Mathematical Analysis of Regularity, Bifurcations, and Turbulence in Fluid Dynamics via Sobolev, Besov, and Triebel-Lizorkin Spaces
本文利用Sobolev、Besov和Triebel-Lizorkin空间建立数学框架，提出基于高低频模态相互作用的Navier-Stokes方程新正则性准则，并分析流体分岔与湍流机制，为Navier-Stokes存在性与光滑性问题及千禧年难题提供理论贡献。
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