Luca Battaglia, Maria Medina, Angela Pistoia
We consider a non-local Liouville equation corresponding to the prescription of the geodesic curvature on the circle. We build a family of solutions which blow up at a critical point of the harmonic extension of the prescribed curvature function, provided some generic assumptions are satisfied.
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We analyse a blow-up sequence of solutions for Liouville type equations involving Dirac measures with "collapsing" poles. We consider the case where blow-up occurs exactly at a point where the poles coalesce. After proving that a "quantization" property still holds for the "blow-up mass", we obtain precise point-wise estimates when blow-up occurs with the least blow-up mass. Interestingly, such estimates express the exact analogue of those obtained for "bubble" solutions of "regular" Liouville equations, when the "collapsing" Dirac measures are neglected. Such information will be used to descr…
We consider the Hardy-Hénon parabolic equation $u_t-Δu =|x|^a |u|^{p-1}u$ with $p>1$ and $a\in {\mathbb R}$. We establish the space-time singularity and decay estimates, and Liouville-type theorems for radial and nonradial solutions. As applications, we study universal and a priori bound of global solutions as well as the blow-up estimates for the corresponding initial boundary value problem.
We consider generic 2 x 2 singular Liouville systems on a smooth bounded domain in the plane having some symmetry with respect to the origin. We construct a family of solutions to which blow-up at the origin and whose local mass at the origin is a given quantity depending on the parameters of the system. We can get either finitely many possible blow-up values of the local mass or infinitely many. The blow-up values are produced using an explicit formula which involves Chebyshev polynomials.
In this paper we study the asymptotic behavior of sequences of stationary weak solutions to the following Liouville-type equation $-Δu=e^u~~~{in }~~~Ω$, where $Ω$ is an open set of $R^3$. By improving the partial regularity estimates obtained by the first author for the above equation, we succeed in performing a blow-up analysis without Morrey-type assumptions on the solutions $u$ and on the nonlinearity $e^u.$
Simple blow-up solutions of singular Liouville equations
本文证明在球面Harnack不等式成立时，奇异Liouville方程存在具有非消失系数函数的爆破解，强化了Wei-Zhang的消失定理。
We are concerned with wave equations associated to some Liouville-type problems on compact surfaces, focusing on sinh-Gordon equation and general Toda systems. Our aim is on one side to develop the analysis for wave equations associated to the latter problems and second, to substantially refine the analysis initiated in [11] concerning the mean field equation. In particular, by exploiting the variational analysis recently derived for Liouville-type problems we prove global existence in time for the sub-critical case and we give general blow up criteria for the super-critical and critical case.…
On Non-simple blowup solutions of Liouville equation
针对带量化奇异源的Liouville方程的非简单爆破难题，研究者证明了单位球Dirichlet边界条件下无非简单爆破的猜想，并推广到任意有界区域，为相关研究方向铺平道路。
Laplacian Vanishing Theorem for Quantized Singular Liouville Equation
本文针对带量化奇异源的奇异Liouville方程建立拉普拉斯消失定理，给出非简单爆破情形下系数函数拉普拉斯趋于零的结论，是该类方程的首个二阶估计，具有重要应用价值。
Blow-Up Theory and Liouville-Type Theorem for Solutions of a Class of Generalized Camassa-Holm-Kadomtsev-Petviashvili Equations
本文研究了一类广义CH-KP方程解的爆发行为和Liouville型定理，通过特征线、先验估计和Riccati不等式证明了爆发准则和唯一性定理。
We consider the nonlocal Liouville type equation $$ (-Δ)^{\frac{1}{2}} u = \varepsilon κ(x) e^u, \quad u > 0, \quad \mbox{in } I, \qquad u = 0, \quad \mbox{in } \mathbb{R} \setminus I, $$ where $I$ is a union of $d \geq 2$ disjoint bounded intervals, $κ$ is a smooth bounded function with positive infimum and $\varepsilon > 0$ is a small parameter. For any integer $1 \leq m \leq d$, we construct a family of solutions $(u_\varepsilon)_{\varepsilon}$ which blow up at $m$ interior distinct points of $I$ and for which $\varepsilon \int_I κe^{u_\varepsilon} \, \rightarrow 2 m π$, as $\varepsilon \to…
On the Classification of blow-up solutions of a singular Liouville equation on the disk
本文研究了奇异李乌维尔方程的爆破行为，分类了所有爆破解，并确定了解的数量。对于固定α>0和λ∈(0,λ_α)，方程有确切的解数，包括最小能量解、奇异序列和多峰序列。
Quantization of blow-up masses for the Finsler $N$-Liouville equation
本文对 Finsler $N$-Liouville 方程的爆破解质量进行量化，推广了 Li-Shafrir、Wang-Xia 及 Esposito-Lucia 等关于 Liouville 型方程的相关经典结果。
We are concerned with the existence of blowing-up solutions to the following boundary value problem $$-Δu= \la a(x) e^u-4πN δ_0\;\hbox{ in } Ω,\quad u=0 \;\hbox{ on }\partial Ω,$$ where $Ω$ is a smooth and bounded domain in $\R^2$ such that $0\inΩ$, $a(x)$ is a positive smooth function, $N$ is a positive integer and $\la>0$ is a small parameter. Here $δ_0$ defines the Dirac measure with pole at $0$. We find conditions on the function $a$ and on the domain $Ω$ under which there exists a solution $u_\la$ blowing up at $0$ and satisfying $\la\into a(x)e^{u_\la} \to 8π(N+1)$ as $\la\to 0^+$.
In this paper, we study the blow-up analysis for a sequence of solutions to the Liouville type equation with exponential Neumann boundary condition. For interior case, i.e. the blow-up point is an interior point, Li \cite{Li} gave a uniform asymptotic estimate. Later, Zhang \cite{Zhang} and Gluck \cite{Gluck} improved Li's estimate in the sense of $C^0$-convergence by using the method of moving planes or classification of solutions of the linearized version of Liouville equation. If the sequence blows up at a boundary point, Bao-Wang-Zhou \cite{Bao-Wang-Zhou} proved a similar asymptotic estima…
Excluding blowup at zero points of the potential by means of Liouville-type theorems
本文证明了 Merle 和 Zaag 关于次临界非线性热方程爆破点附近 ODE 行为结果的局部版本，利用 Liouville 型定理排除了时间单调解在势函数零点处发生爆破的可能性，解决了先前遗留的开放问题。
In this paper we study the Euler-Poincaré equations in $\Bbb R^N$. We prove local existence of weak solutions in $W^{2,p}(\Bbb R^N),$ $p>N$, and local existence of unique classical solutions in $H^k (\Bbb R^N)$, $k>N/2+3$, as well as a blow-up criterion. For the zero dispersion equation($α=0$) we prove a finite time blow-up of the classical solution. We also prove that as the dispersion parameter vanishes, the weak solution converges to a solution of the zero dispersion equation with sharp rate as $α\to0$, provided that the limiting solution belongs to $C([0, T);H^k(\Bbb R^N))$ with $k>N/2 +3$…
Liouville comparison theory for blowup of Euler-Arnold equations
该研究提出无穷维函数空间中基于Liouville方程比较的Euler-Arnold方程爆破新准则，证明了三维及以上高阶EPDiff方程在一维存在全局解的情形下仍会发生C^1爆破。
We study the existence of solutions with multiple concentration to the following boundary value problem $$-Δu=\e^2 e^u-4π\sum_{p\in Z}α_p δ_{p}\;\hbox{in} Ω,\quad u=0 \;\hbox{on}\partial Ω,$$ where $Ω$ is a smooth and bounded domain in $\R^2$, $α_{p}$'s are positive numbers, $Z\subset Ω$ is a finite set, $δ_p$ defines the Dirac mass at $p$, and $\e>0$ is a small parameter. In particular we extend the result of Del-Pino-Kowalczyk-Musso (\cite{delkomu}) to the case of several singular sources. More precisely we prove that, under suitable restrictions on the weights $α_p$, a solution exists with …
Super-Liouville equation with a spinorial Yamabe type term
本文研究带有旋量Yamabe型项的超Liouville方程，为爆破序列建立精细定性性质，证明旋量与函数部分的能量恒等式并计算局部质量，揭示了由非线性项导致的两种奇性新现象。
We establish blow-up profiles for any blowing-up sequence of solutions of general conformally invariant fully nonlinear elliptic equations on Euclidean domains. We prove that (i) the distance between blow-up points is bounded from below by a universal positive number, (ii) the solutions are very close to a single standard bubble in a universal positive distance around each blow-up point, and (iii) the heights of these bubbles are comparable by a universal factor. As an application of this result, we establish a quantitative Liouville theorem.
On the construction of non-simple blow-up solutions for the singular Liouville equation with a potential
本文研究了带势函数的奇异 Liouville 方程边值问题，在 $N=1$ 且对势函数在原点的导数作适当假设下，构造出参数趋于零时呈现非简单爆破轮廓的解。
High Order Vanishing Theorems for Nonsimple Blowup Solutions of Singular Liouville Equation
本文研究奇异 Liouville 方程中非简单爆破现象，证明其仅在系数函数导数趋于零时发生，确定了任意量子化奇异源的消失阶数，为消除非简单爆破情形和研究移动极点爆破解提供了理论工具。
We consider positive solutions of cooperative parabolic Lotka-Volterra systems with equal diffusion coefficients, in bounded and unbounded domains. The systems are complemented by the Dirichlet or Neumann boundary conditions. Under suitable assumptions on the coefficients of the reaction terms, these problems possess both global solutions and solutions which blow up in finite time. We show that any solution $(u,v)$ defined on the time interval $(0,T)$ satisfies a universal estimate of the form $$u(x,t)+v(x,t)\leq C(1+t^{-1}+(T-t)^{-1}),$$ where $C$ does not depend on $x,t,u,v,T$. In particular…
A Liouville-type theorem in a half-space and its applications to the gradient blow-up behavior for superquadratic diffusive Hamilton-Jacobi equations
本文证明半空间中超二次扩散Hamilton-Jacobi方程的刘维尔型分类定理，断言解必为一维，并以此研究一般有界区域抛物问题的边界梯度爆破行为，揭示法向普适爆破剖面、切向更奇异行为及粘性解延拓后边界条件的丢失。
We prove that the family $\mathcal{F}_C(D)$ of all meromorphic functions $f$ on a domain $D\subseteq \mathbb{C}$ with the property that the spherical area of the image domain $f(D)$ is uniformly bounded by $C π$ is quasi--normal of order $\le C$. We also discuss the close relations between this result and the well--known work of Brézis and Merle on blow--up solutions of Liouville's equation. These results are completely in the spirit of Gromov's compactness theorem, as pointed out at the end of the paper.
Higher-order criteria and sharpness for blow-up at quantized singularities in Liouville equations
针对Liouville方程解在量子奇点处的爆破问题，研究了其高阶判据，证明了Wei-Zhang上界的尖锐性，区分了简单与非简单爆破行为。
In this paper we perform a blow-up and quantization analysis of the following nonlocal Liouville-type equation \begin{equation}(-Δ)^\frac12 u= κe^u-1~\mbox{in $S^1$,} \end{equation} where $(-Δ)^\frac{1}{2}$ stands for the fractional Laplacian and $κ$ is a bounded function. We interpret the above equation as the prescribed curvature equation to a curve in conformal parametrization. We also establish a relation between this equation and the analogous equation in $\mathbb{R}$ \begin{equation} (-Δ)^\frac{1}{2} u =Ke^u \quad \text{in }\mathbb{R}, \end{equation} with $K$ bounded on $\mathbb{R}$.
Local uniqueness and non-degeneracy of blowup solutions for regular Liouville systems
本文研究紧 Riemann 曲面上正则 Liouville 系统的爆破解，在自然假设下证明其局部唯一性与非退化性，并通过高精度逐点估计、Fredholm 理论及任意有限阶分析推广单方程结果。
In this paper, we consider the indefinite fractional elliptic problem. A corresponding Liouville-type theorem for the indefinite fractional elliptic equations is established. Furthermore, we obtain a priori bound for solutions in a bounded domain by blowing-up and re-scaling. We also classify the solutions of some degenerate elliptic equation originated from fractional Laplacian.
Quantization for Palais-Smale sequences of the Liouville functional on closed surfaces
本文证明了紧致曲面上Liouville方程泛函的Palais-Smale序列的量子化性质，通过精细的$L^p$估计获得梯度界和颈部分析，从而直接应用变分方法在非共振区域获得解的存在性，并讨论了爆点的聚集与孤立条件。
We prove Liouville type theorems for the self-similar solutions to the Navier-Stokes equations. One of our results generalizes the previous ones by Nečas-Ružička-Šverak and Tsai. Using the Liouville type theorem we also remove a scenario of asymtotically self-similar blow-up for the Navier-Stokes equations with the profile belonging to $L^{p, \infty} (\Bbb R^3)$ with $p> \frac{3}{2}$.
In this paper, we establish blow-up rates for higher-order semilinear parabolic equations with nonlocal in time nonlinearity with no positive assumption on the solution. We also give Liouville-type theorem for higher-order semilinear parabolic equation with infinite memory nonlinear term which plays the main tools to prove our blow-up rate result. Finally, we study the well-posedness of mild solutions.
We prove a Liouville type classification theorem in half-spaces for infinite boundary value problems related to fully nonlinear, uniformly elliptic operators. We then apply the result in order to obtain gradient boundary blow up rates for ergodic functions in bounded domains related to degenerate/singular operators, and, as a further consequence, we deduce the uniqueness of the ergodic functions.
Non degeneracy of blow-up solutions of non-quantized singular Liouville-type equations and the convexity of the mean field entropy of the Onsager vortex model with singular sources
本文证明了奇异平均场方程在正则或非量子化奇异源爆破解点处泡泡解的非退化性，推广了已有结果，并由此得到带奇异源的Onsager涡旋模型中一类二维区域熵在大能量极限下的严格凸性。
We study the wave analog of the Liouville equation and the constant mean curvature equations in 2 space dimensions, which are energy critical. We exhibit a blow-up criteria for the former using tools from conformal geometry, and we exhibit finite time blow-up for the latter under suitable assumptions on the initial data.
We study a class of semilinear elliptic equations with constraints in higher dimension. It is known that several mathematical structures of the problem are closed to those of the Liouville equation in dimension two. In this paper, we establish a classification of entire solutions, the $\sup + \inf$ type inequality and the quantized blowup mechanism.
Second order classification for singular Liouville equations with a coefficient function
本文研究了奇异李乌维尔方程在单位球内解的发散性，通过分析势函数$V$的第二阶分类，确定了当参数$λ$趋近于零时解序列发散的条件。
Super-Liouville equation with a Dirichlet-chiral boundary
本文证明在Dirichlet-手性边界条件下，超Liouville方程不存在爆破，解决了其紧性问题。
Liouville phenomenon for the Klein-Gordon equation in 1+1 dimensions
本文研究1+1维Klein-Gordon方程，发现时空分裂成四个象限时，其中两个是类时，两个是类空，类空区域中解表现出Liouville现象，即解的生长不足导致对称性。
In this paper we mainly investigate the initial value problem of the periodic Euler-Poincaré equations. We first present a new blow-up result to the system for a special class of smooth initial data by using the rotational invariant properties of the system. Then, we prove that the periodic Euler-Poincaré equations is ill-posed in critical Besov spaces by a contradiction argument. Finally, we verify the system possesses a class of peakon solutions in the sense of distributions.
Construction of blowup solutions for Liouville systems
本文在平坦环面上研究Liouville系统，针对多泡解存在性这一核心问题，在最一般设定下给出了多泡解的全面构造。
In this paper, we develop the blow-up analysis and establish the energy quantization for solutions to super-Liouville type equations on Riemann surfaces with conical singularities at the boundary. In other problems in geometric analysis, the blow-up analysis usually strongly utilizes conformal invariance, which yields a Noether current from which strong estimates can be derived. Here, however, the conical singularities destroy conformal invariance. Therefore, we develop another, more general, method that uses the vanishing of the Pohozaev constant for such solutions to deduce the removability …
In this paper, we consider a blow-up solution for the complex-valued semilinear wave equation with power non-linearity in one space dimension. We show that the set of non characteristic points $I_0$ is open and that the blow-up curve is of class $C^{1,μ_0}$ and the phase $θ$ is $C^{μ_0}$ on this set. In order to prove this result, we introduce a Liouville Theorem for that equation.
Liouville type of theorems play a key role in the blow-up approach to study the global regularity of the three-dimensional Navier-Stokes equations. In this paper, we will prove Liouville type of theorems to the 3-D axisymmetric Navier-Stokes equations with swirls under some suitable assumptions on swirl component velocity $u_θ$ which are scaling invariant. It is known that $ru_θ$ satisfies the maximum principle. The assumptions on $u_θ$ will be natural and useful to make further studies on the global regularity to the three-dimensional incompressible axisymmetric Navier-Stokes equations.
A note on certain scenarios of Type II blowups of suitable weak solutions to the Navier-Stokes equations
本文研究Navier-Stokes方程合适弱解的II型爆炸场景，证明在特定条件下此类爆炸不存在，从而得出正则性结果。
In this paper, we are concerned with Liouville-type theorems for the nonlinear elliptic equation {equation*} Δ^2 u=|x|^a |u|^{p-1}u\;\ {in}\;\ Ω, {equation*}where $a \ge 0$, $p>1$ and $Ω\subset \mathbb{R}^n$ is an unbounded domain of $\mathbb{R}^n$, $n \ge 5$. We prove Liouville-type theorems for solutions belonging to one of the following classes: stable solutions and finite Morse index solutions (whether positive or sign-changing). Our proof is based on a combination of the {\it Pohozaev-type identity}, {\it monotonicity formula} of solutions and a {\it blowing down} sequence, which is used …
Motivated by the supersymmetric extension of Liouville theory in the recent physics literature, we couple the standard Liouville functional with a spinor field term. The resulting functional is conformally invariant. We study geometric and analytic aspects of the resulting Euler-Lagrange equations, culminating in a blow up analysis.
The propagation of regularity and dispersive blow-up phenomenon to higher-order generalized KdV equations
本文研究了高阶广义 KdV 方程初值问题的光滑性与奇异性，证明了正则性以无穷大速度传播，并通过构造光滑初始数据揭示了由短波或长波聚焦引起的色散爆破现象。
On potential Type II blowups for the Navier-Stokes equations
本文在局部层面考虑Navier-Stokes方程解的潜在Type II爆破情景，基于Euler缩放和Liouville型定理推广了先前工作，并分析了爆破特征。
Motivated by the study of non abelian Chern Simons vortices of non topological type in Gauge Field Theory, we analyse the solvability of planar Liouville systems of Toda type in presence of singular sources. We identify necessary and sufficient conditions on the "flux" pair which ensure the radial solvability of the system. Since the given system includes the (integrable) 2 X 2 Toda system as a particular case, thus we recover the existence result available in this case. Our method relies on a blow-up analysis, which even in the radial setting, takes new turns compared with the single equation…
In this paper, we consider the dynamics of the solution to the mass critical focusing Hartree equation with inverse-square potential in the energy space $H^{1}(\mathbb{R}^d)$. The main difficulties are the equation is \emph{not} space-translation invariant and the nonlinearity is non-local. We first prove that if the mass of the initial data is less than that of ground states, then the solution will be global. Although we don't know whether the ground state is unique, we can verify all the ground states have the same, minimal mass threshold. Then at the minimal mass threshold, we can construct…
This work studies nonnegative solutions for the Cauchy, Neumann, and Dirichlet problems of a logistic type reaction-diffusion equation. The finite time blowup results for nonnegative solutions under various restrictions on the coefficients of this equation are presented. Applying the results allows one to construct some reaction diffusion systems with the so-called diffusion-induced blowup phenomenon, particularly in the case of equal diffusion rates.
In this paper, we investigate blow-up of solutions to semilinear wave equations with scale-invariant damping and nonlinear memory term in $\mathbb{R}^n$, which can be represented by the Riemann-Liouville fractional integral of order $1-γ$ with $γ\in(0,1)$. Our main interest is to study mixed influence from damping term and the memory kernel on blow-up conditions for the power of nonlinearity, by using test function method or generalized Kato's type lemma. We find a new competition, particularly for the small value of $γ$, on the blow-up range between the effective case and the non-effective ca…
This paper is devoted to the analysis of the classical Keller-Segel system over $\mathbb{R}^d$, $d\geq 3$. We describe as much as possible the dynamics of the system characterized by various criteria, both in the parabolic-elliptic case and in the fully parabolic case. The main results when dealing with the parabolic-elliptic case are: local existence without smallness assumption on the initial density, global existence under an improved smallness condition and comparison of blow-up criteria. A new concentration phenomenon criteria for the fully parabolic case is also given. The analysis is co…
This paper is concerned with the blowup phenomenon of stochastic parabolic equations both on bounded domain and in the whole space. We introduce a new method to study the blowup phenomenon on bounded domain. Comparing with the existing results, we delete the assumption that the solutions to stochastic heat equations are non-negative. Then the blowup phenomenon in the whole space is obtained by using the properties of heat kernel. We obtain that the solutions will blow up in finite time for nontrivial initial data.
This paper concerns with the explicit blowup phenomenon for 3D incompressible MHD equations in R^3. More precisely, we find two family of explicit blowup solutions for 3D incompressible MHD equations in R^3. One family of solutions admit the smooth initial data, and the initial data of another family of solutions are not smooth. The energy of those solutions is infinite. Moreover, our results tell us that the blowup phenomenon of 3D incompressible MHD can only take place in the velocity field of the fluid, but no blowup for the magnetic field.
The well-posedness and blow up phenomenon for a Tsunamis model with time-fractional derivative
本文针对时间分数阶海啸浅水波模型，采用共形分数阶导数，证明了其在临界Besov空间$B^{\frac{3}{2}}_{2,1}$中的局部适定性，以及满足对称与符号条件时强解的有限时间爆破性质。
Blow up analysis for a parabolic MEMS problem, I: Hölder estimate
本文针对抛物型 MEMS 方程的淬灭现象，运用爆破方法与 Liouville 定理建立解的最优 Hölder 估计及一致连续解序列的收敛理论，并据此证明破裂集分层定理。
We consider the nonlocal Hénon-Gelfand-Liouville problem $$ (-Δ)^s u = |x|^a e^u\quad\mathrm{in}\quad \mathbb R^n, $$ for every $s\in(0,1)$, $a>0$ and $n>2s$. We prove a monotonicity formula for solutions of the above equation using rescaling arguments. We apply this formula together with blow-down analysis arguments and technical integral estimates to establish non-existence of finite Morse index solutions when $$\dfrac{Γ(\frac n2)Γ(s)}{Γ(\frac{n-2s}{2})}\left(s+\frac a2\right)> \dfrac{Γ^2(\frac{n+2s}{4})}{Γ^2(\frac{n-2s}{4})}.$$
In this paper, we are concerned with the weighted elliptic system \begin{equation*} \begin{cases} -Δu=|x|^β v^{\vartheta},\\ -Δv=|x|^α |u|^{p-1}u, \end{cases}\quad \mbox{in}\;\ Ω, \end{equation*}where $Ω$ is a subset of $\mathbb{R}^N$, $N \ge 5$, $α>-4$, $0 \le β\le \dfrac{N-4}{2}$, $p>1$ and $\vartheta=1$. We first apply Pohozaev identity to construct a monotonicity formula and find their certain equivalence relation. By the use of {\it Pohozaev identity}, {\it monotonicity formula} of solutions together with a {\it blowing down} sequence, we prove Liouville-type theorems of stable solutions …
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