Yuri Bozhkov, Igor Leite Freire
We show that any Lie point symmetry of semilinear Kohn-Laplace equations on the Heisenberg group H^1 with power nonlinearity is a divergence symmetry if and only if the corresponding exponent assumes critical value.
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We study the Lie point symmetries of semilinear Kohn-Laplace equations on the Heisenberg group H^1 and obtain a complete group classification of these equations.
Using the complete group classification of semilinear differential equations on the three-dimensional Heisenberg group carried out in a preceding work, we establish the conservation laws for the critical Kohn-Laplace equations via the Noether's Theorem.
We show which Lie point symmetries of non-critical semilinear Kohn-Laplace equations on the Heisenberg group $H^1$ are Noether symmetries and we establish their respectives conservations laws.
We use a suitable transform related to Sobolev inequality to investigate the sharp constants and optimizers for some Caffarelli-Kohn-Nirenberg-type inequalities which are related to the weighted $p$-Laplace equations. Moreover, we give the classification to the linearized problem related to the radial extremals. As an application, we investigate the gradient type remainder term of related inequality by using spectral estimate combined with a compactness argument which extends the work of Figalli and Zhang (Duke Math. J. 2022) at least for radial case.
Fractional Caffarelli-Kohn-Nirenberg type inequalities on the Heisenberg group
本文在 Heisenberg 群的分数阶 Sobolev 空间中建立了若干 Caffarelli-Kohn-Nirenberg 不等式情形，并改进了已有 Hardy 型不等式的指标范围。
Optimal in tail Hölder estimates for weak solutions of the nonlocal parabolic p-Laplace equations on the Heisenberg group
本文研究了海森堡群上非局部抛物p-拉普拉斯方程弱解的最优尾Hölder估计问题，通过引入最优尾条件证明了弱解的Hölder连续性。
For $1\leq q \leq n-2$, we provide explicit examples to demonstrate non-compactness of the Neumann operator for the Kohn Laplacian acting on $L^2$ $(0,q)$-forms on the unit ball in $(2n+1)$-dimensional Heisenberg space.
We derive two equivalent definitions of the viscosity solutions to the homogeneous sub-p- Laplace parabolic equations on the Heisenberg group, and characterize the viscosity solutions in terms of an asymptotic mean value formula. Moreover, we construct an example to show that these formulae do not hold in non-asymptotic sense.
In this note we construct an integral boundary condition for the Kohn Laplacian in a given domain on the Heisenberg group extending to the setting of the Heisenberg group M. Kac's "principle of not feeling the boundary". This also amounts to finding the trace on smooth surfaces of the Newton potential associated to the Kohn Laplacian. We also obtain similar results for higher powers of the Kohn Laplacian.
Gradient stability of Caffarelli-Kohn-Nirenberg inequality involving weighted p-Laplace
本文研究含加权 p-Laplace 的 CKN 不等式，通过线性化问题分类证明极值元非退化，并结合谱估计与紧性论证建立梯度型余项稳定性。
Equivalence of weak and viscosity solutions for nonlocal p-Laplace type equations on the Heisenberg group
研究海森堡群上一类非局部p-拉普拉斯型方程弱解与粘性解的等价性，核心方法是修正下卷积的内在逼近、海森堡平滑化及适应次黎曼几何的非局部分部积分论证，克服了海森堡群非交换结构带来的困难。
Mixed local-nonlocal $p$-Laplace equation with variable singular nonlinearity in the Heisenberg group
本文研究了海森堡群中混合局部-非局部 $p$-拉普拉斯方程的弱解存在性、唯一性和正则性，首次在非交换设定中处理此类问题。
We discuss the wellposedness of the Neumann problem on a half-space for the Kohn-Laplacian in the Heisenberg group. We then construct the Neumann function and explicitly represent the solution of the associated inhomogeneous problem.
Entire Nodal Solutions with Prescribed Symmetry to Caffarelli-Kohn-Nirenberg Equations
针对Caffarelli-Kohn-Nirenberg型带权临界p-Laplace方程，本文通过分析对称构型的性质与相容条件，证明了无穷多类指定对称性下非平凡变号整体节点解的存在性。
A Struwe-type Decomposition Result for Weighted Critical $p$-Laplace Equations
本文在包含原点的有界区域中，为Caffarelli-Kohn-Nirenberg型临界p-Laplace方程建立了Palais-Smale序列的Struwe型分解，并引入新的重标度律以处理权函数带来的新困难。
Existence and uniqueness of the solution of the Neumann problem for the Kohn-Laplacian on the Korányi ball of the Heisenberg group $\mathbb{H}_n$ are discussed. Explicit representations of Green's type function (Neumann function) for the half space and Korányi ball in $\mathbb{H}_n$ for circular functions have been obtained. These functions are then used on above regions in $\mathbb{H}_n$ to solve the inhomogeneous Neumann boundary value problem for circular data.
In this article, we are study the following Dirichlet problem with Choquard type non linearity \[ -Δ_{\mathbb{H}} u = a u+ \left(\int_Ω\frac{|u(η)|^{Q^*_λ}}{|η^{-1}ξ|^λ}dη\right)|u|^{Q^*_λ-2}u \; \text{in}\; Ω,\quad u = 0 \; \text{ on } \partial Ω, \] where $Ω$ is a smooth bounded subset of the Heisenberg group $\mathbb{H}^N, N\in \mathbb N$ with $C^2$ boundary and $Δ_{\mathbb{H}}$ is the Kohn Laplacian on the Heisenberg group $\mathbb{H}^N$. Here, $Q^*_λ=\frac{2Q-λ}{Q-2},\; Q= 2N+2$ and $a$ is a positive real parameter. We derive the Brezis-Nirenberg type result for the above problem. Moreove…
Beals, Gaveau and Greiner (1996) find the fundamental solution to a 2-Laplace-type equation in a class of sub-Riemannian spaces. This solution is related to the well-known fundamental solution to the p-Laplace equation in Grushin-type spaces (Bieske-Gong, 2006) and the Heisenberg group (Capogna, Danielli, Garofalo, 1997). We extend the 2-Laplace-type equation to a p-Laplace-type equation. We show that the obvious generalization does not have desired properties, but rather, our generalization preserves some natural properties.
We consider positive critical points of Caffarelli-Kohn-Nirenberg inequalities and prove a Liouville type result which allows us to give a complete classification of the solutions in a certain range of parameters, providing a symmetry result for positive solutions. The governing operator is a weighted $p$-Laplace operator, which we consider for a general $p \in (1,d)$. For $p=2$, the symmetry breaking region for extremals of Caffarelli-Kohn-Nirenberg inequalities was completely characterized in [J. Dolbeault, M. Esteban, M. Loss, Invent. Math. 44 (2016)]. Our results extend this result to a ge…
We present a proof of the local Hölder regularity of the horizontal derivatives of weak solutions to the $p$-Laplace equation in the Heisenberg group $\mathbb{H}^1$ for $p>4 $.
We find fundamental solutions to p-Laplace equations with drift terms in the Heisenberg group and Grushin-type planes. These solutions are natural generalizations to the fundamental solutions discovered by Beals, Gaveau, and Greiner for the Laplace equation with drift term. Our results are independent of the results of Bieske and Childers, in that Bieske and Childers consider a generalization that focuses on a p-Laplace-type equation while we primarily concentrate on a generalization of the drift term.
Fujita exponent for the fractional sub-Laplace semilinear heat equation with forcing term on the Heisenberg group
本文在海森堡群上研究带强迫项的分数次亚拉普拉斯半线性热方程，确定其 Fujita 指数为 Q/(Q-2s)，并证明超临界情形全局解存在、次临界情形全局解不存在、临界情形存在有限时间爆破解，从而将经典 Fujita 现象推广到次黎曼非局部框架。
Consider the wave equation associated with the Kohn Laplacian on groups of Heisenberg type. We construct parametrices using oscillatory integral representations and use them to prove sharp $L^p$ and Hardy space regularity results.
In an interesting note, E.M. Stein observed some 20 years ago that while the Kohn Laplacian $\square_b$ on functions is neither locally solvable nor (analytic) hypoelliptic, the addition of a non-zero complex constant reversed these conclusions at least on the Heisenberg group, and Kwon reproved and generalized this result using the method of concatenations. Recently Hanges and Cordaro have studied this situation on the Heisenberg group in detail. Here we give a purely $L^2$ proof of Stein's result using the author's now classical construction of $(T^p)_ϕ= ϕT^p +...,$ where $T$ is the 'missing…
Regularity theory for nonlocal equations with general growth in the Heisenberg group
本文在海森堡群中研究非局部 $G$-Laplace 方程，利用改进的非局部 Caccioppoli 型估计，以 De Giorgi-Nash-Moser 理论统一证明了弱解的有界性、Hölder 连续性与 Harnack 不等式。
We prove some basic inequalities relating the Gagliardo-Nirenberg seminorms of a symmetric function $u$ on $\mathbb R^n$ and of its perturbation $uφ_μ$, where $φ_μ$ is a suitably chosen eigenfunction of the Laplace-Beltrami operator on the sphere $\mathbb S^{n-1}$, thus providing a technical but rather powerful tool to detect symmetry breaking and multiplicity phenomena in variational equations driven by the fractional Laplace operator. A concrete application to a problem related to the fractional Caffarelli-Kohn-Nirenberg inequality is given.
The goal of this article is to establish local Lipschitz continuity of weak solutions for a class of degenerated elliptic equations of divergence form, in the Heisenberg Group. The considered hypothesis for the growth and ellipticity condition is a natural generalization of the p-Laplace equation and more general quasilinear elliptic equations with polynomial or exponential type growth.
On sharp singular Moser-Trudinger type inequalities and applications to zero mass $(p,Q)$-Laplace subelliptic equations in the Heisenberg group
本文在Heisenberg群中建立尖锐奇异Moser-Trudinger型不等式，分析其等价性，运用山路定理证明零质量(p,Q)-Laplace次椭圆方程正基态解的存在性。
Sharp pointwise estimates for weighted critical $p$-Laplace equations
本文研究由 Caffarelli–Kohn–Nirenberg 不等式导出的加权拟线性椭圆方程解的渐近行为，利用 Kelvin 型变换获得比非加权情形更精细的无穷远处锐点态估计，并克服了拟线性情形下应用该变换所需的预备估计困难。
Optimal stability hierarchies of the Heisenberg Uncertainty Principle for solenoidal fields and of the second order Caffarelli--Kohn--Nirenberg inequalities
本文针对螺线管场的海森堡不确定性原理和二阶CKN不等式，建立了最优稳定性层级，给出显式稳定性常数，并通过Fourier--Hankel变换新方法简化证明。
We prove dispersive and Strichartz inequalities for the solution of the wave equation related to the full Laplacian on the Heisenberg group, by means of Besov spaces defined by a Littlewood--Paley decomposition related to the spectral resolution of the full Laplacian. This requires a careful analysis due also to the non-homogeneous nature of the full Laplacian. This result has to be compared to a previous one by Bahouri, Gérard and Xu concerning the solution of the wave equation related to the Kohn-Laplacian.
Nonlocal singular problem and associated Sobolev type inequality with extremal in the Heisenberg group
本文在海森堡群中研究含变指数奇异项的分数阶p-Laplace方程，证明弱解的存在性、正则性与常指数情形下的唯一性，并刻画相关Sobolev型不等式的极值函数及其与奇异问题解的联系。
A representation formula for regular functions on the characteristic plane of the second Heisenberg group
本文研究第二海森堡群特征平面上的拉普拉斯型算子及其基本解，引入共形拉普拉斯算子，证明外围空间嵌入诱导距离是其基本解的良好近似，给出光滑函数的表示公式且该公式在特征点内稳定。
On mixed local-nonlocal Sobolev-type inequalities and their connection with singular equations in the Heisenberg group
本文在Heisenberg群中建立混合局部-非局部Sobolev型不等式，证明其与奇异p-Laplace方程的解关系，并提供了一种统一框架，连接不同情形下奇异方程的存在理论。
In this note, we concentrate on the sub-Laplace on the nilpotent Lie group of rank two, which is the infinitesimal generator of the diffusion generated by $n$ Brownian motions and their $\frac{n(n-1)}2$ Lévy area processes, which is the simple extension of the sub-Laplace on the Heisenberg group $\mathbb{H}$. In order to study contraction properties of the heat kernel, we show that, as in the cases of the Heisenberg group and the three Brownian motion model, the restriction of the sub-Laplace acting on radial functions (see Definition \ref{radial fun}) satisfies a positive Ricci curvature cond…
A fast reconstruction algorithm for geometric inverse problems using topological sensitivity analysis and Dirichlet-Neumann cost functional approach
本文提出了一种基于Kohn-Vogelius公式和拓扑灵敏度分析的快速算法，用于从边界测量中重建浸入各向异性介质中的物体，通过拓扑优化方法最小化能量型函数，利用拓扑渐近展开重构未知物体。
On the study of $(p, Q)$-Laplace Choquard equations with critical Trudinger-Moser nonlinearity in $\mathbb{H}^N$
本文研究Heisenberg群上具有临界Trudinger-Moser非线性与Stein-Weiss反应的(p,Q)-Laplace Choquard方程解的存在性与多重性，结合变分原理与全新Brézis-Lieb引理证明。
Quasilinear Schrödinger Critical Problem on the Heisenberg group \(\mathbb{H}^N\)
研究海森堡群上特定拟线性薛定谔方程驻波解的存在性，通过非线性变量变换转化方程，运用变分方法及集中紧致性论证，在福兰德 - 斯坦索伯列夫空间中建立了非平凡解的存在性。
Symmetry and uniqueness of the positive solution for the critical Hartree equation on the Heisenberg group
本文通过积分形式的移动平面方法，证明了临界Hartree方程在海森堡群上正解的对称性和唯一性。
Brezis-Nirenberg type problem for fractional sub-Laplacian on the Heisenberg group
本文研究海森堡群上含临界 Sobolev 指数项的分数次亚拉普拉斯方程，受 Brezis-Nirenberg 问题启发，证明了在有界连续边界区域中弱解的存在性。
In this paper we define an intrinsic notion of principal for the Hypoelliptic calculus on Heisenberg manifolds. More precisely, the principal symbol of a \psivdo appears as a homogeneous section over the linear dual of the tangent Lie algebra bundle of the manifold. This definition is an important step towards using global $K$-theoretic tools in the Heisenberg setting, such as those involved in the elliptic setting for proving the Atiyah-Singer index theorem or the regularity of the eta invariant. On the other hand, the intrinsic definition of the principal symbol enables us to give an intrins…
In this paper, generalised weighted $L^p$-Hardy,$ L^p$-Caffarelli-Kohn-Nirenberg, and $L^p$-Rellich inequalities with boundary terms are obtained on stratified Lie groups. As consequences, most of the Hardy type inequalities and Heisenberg- Pauli-Weyl type uncertainty principles on stratified groups are recovered. Moreover, a weighted $L^2$-Rellich type inequality with the boundary term is obtained.
Critical Quasilinear Schrödinger Equations on the Heisenberg Group: Existence and Nonexistence
该研究针对海森堡群上带临界指数的拟线性Schrödinger方程，在势函数满足不同条件时分别得到非平凡解的存在性与不存在性结果，还证明了弱解的有界性与指数衰减性。
We give dimension-free regularity conditions for a class of possibly degenerate sub-elliptic equations in the Heisenberg group exhibiting super-quadratic growth in the horizontal gradient; this solves an issue raised by Manfredi & Mingione (Math. Ann. 2007) where only dimension dependent bounds for the growth exponent are given. We also obtain explicit a priori local regularity estimates, and cover the case of the horizontal p-Laplacean operator, extending some regularity proven by Domokos & Manfredi (Cont. Math. 2005). In turn, the a priori estimates found are shown to imply the suitable loca…
Nondegeneracy of positive solutions for critical Hartree equation on Heisenberg group and it's applications
本文研究Heisenberg群上广义能量临界Hartree方程正气泡解的唯一性与非退化性，通过Cayley变换等方法完成证明，并将其应用于分析Brezis-Nirenberg型问题解当$\boldsymbol{\reals}\rightarrow0$时的渐近行为。
Excess decay for quasilinear equations in the Heisenberg group and consequences
本文在海森堡群中为拟线性次椭圆 p-Laplace 型方程建立了与欧氏情形类似的过剩衰减估计，并由此将解的 Hölder 连续性推广到全范围 1<p<∞，同时证明了水平梯度的尖锐临界连续性结果。
The aim of this paper is to study the qualitative behaviour of non-negative entire solutions of certain differential inequalities involving gradient terms on the Heisenberg group. We focus our investigation on the two classes of inequalities of the form $Δ^ϕu \ge f(u)l(|\nabla u|)$ and $Δ^ϕu \ge f(u) - h(u) g(|\nabla u|)$, where $f,l,h,g$ are non-negative continuous functions satisfying certain monotonicity properties. The operator $Δ^ϕ$, called the $ϕ$-Laplacian, can be viewed as a natural generalization of the $p$-Laplace operator recently considered by various authors in this setting. We pr…
High and low perturbations of the critical Choquard equation on the Heisenberg group
本文利用集中紧致原理与临界点理论，研究了海森堡群上临界Choquard方程在高低位扰动下的解的存在性与多重性，证明了不同参数区间下正解、基态解及非平凡弱解的存在性。
Different authors had received a lot of results regarding the Euler and Navier-Stokes equations. Existence and smoothness of solution for the Navier-Stokes equations in two dimensions have been known for a long time. Leray showed that the Navier-Stokes equations in three dimensional space have a weak solution. Scheffer, and Shnirelman, obtained weak solution of the Euler equations with compact support in spacetime. Caffarelli, Kohn and Nirenberg improved Scheffer's results, and F.-H. Lin simplified the proof of the results of J. Leray. Many problems and conjectures about behavior of weak solut…
We present an invariant definition of the hypoelliptic Laplacian on sub-Riemannian structures with constant growth vector, using the Popp's volume form introduced by Montgomery. This definition generalizes the one of the Laplace-Beltrami operator in Riemannian geometry. In the case of left-invariant problems on unimodular Lie groups we prove that it coincides with the usual sum of squares. We then extend a method (first used by Hulanicki on the Heisenberg group) to compute explicitly the kernel of the hypoelliptic heat equation on any unimodular Lie group of type I. The main tool is the noncom…
The overall goal of this dissertation is to investigate certain classical results from harmonic analysis, replacing the Euclidean setting, the abelian structure and the elliptic Laplace operator with a non-commutative environment and hypoelliptic operators. More specifically, we consider wave equations for hypoelliptic homogeneous left-invariant operators on graded Lie groups with time-dependent non-negative propagation speeds that are Hölder-regular or even more so. The corresponding Euclidean problem has been extensively studied in the `80s and some additional results have been recently obta…
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