Gianluca Ferrari, Marco Squassina
We obtain some nonlocal characterizations for a class of variable exponent Sobolev spaces arising in nonlinear elasticity theory and in the theory of electrorheological fluids. We also get a singular limit formula extending Nguyen results to the anisotropic case.
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We obtain some nonlocal characterizations for a class of variable exponent Sobolev spaces arising in nonlinear elasticity, in the theory of electrorheological fluids as well as in image processing for the regions where the variable exponent $p(x)$ reaches the value $1$.
Fractional Sobolev spaces via interpolation, and applications to mixed local-nonlocal operators
本文介绍分数阶Sobolev空间与插值理论的关联，给出其作为Lebesgue与整数阶Sobolev空间间实/复插值空间的等价刻画，并用插值理论证明混合局部-非局部算子的谱定理，为早期研究者提供该领域简洁入门内容。
Hardy inequalities and nonlocal capacity
本文引入并研究了与非局部Sobolev空间相关的容量，特别是零阶非局部算子对应的空间，通过证明Hardy型不等式获得Sobolev嵌入，进而估计球体的非局部容量。
We introduce a large class of concentrated $p$-Lévy integrable functions approximating the unity, which serves as the core tool from which we provide a nonlocal characterization of Sobolev spaces and the space of functions of bounded variation via nonlocal energies forms. It turns out that this nonlocal characterization is a necessary and sufficient criterion to define Sobolev spaces on domains satisfying the extension property. We also examine the general case where the extension property does not necessarily hold. In the latter case, we establish weak convergence of the nonlocal Radon measur…
Nonlocal Gagliardo-Nirenberg-Sobolev type inequality
本文在非局部Sobolev空间中建立Gagliardo-Nirenberg-Sobolev型不等式，导出Sobolev嵌入及紧嵌入，并揭示其与Poincaré型不等式的互反关系，经典分数阶情形作为特例。
This paper is concerned with the multiplicity of nontrivial solutions in an Orlicz-Sobolev space for a nonlocal problem involving N-functions and theory of locally Lispchitz continuous functionals.
In this paper, we investigate the existence of ground state solutions and non-existence of non-trivial weak solution of biharmonic equation with some nonlocal terms and critical Sobolev exponent. Firstly, we prove the non-existence by establishing Pohozaev type of identity. Next, we study the existence of ground state solutions by using the minimization method on the associated Nehari manifold.
We study elliptic equations of order $2m$ with nonlocal boundary-value conditions in plane angles and in bounded domains, dealing with the case where the support of nonlocal terms intersects the boundary. We establish necessary and sufficient conditions under which nonlocal problems are Fredholm in Sobolev spaces and, respectively, in weighted spaces with small weight exponents. We also obtain an asymptotics of solutions to nonlocal problems near the conjugation points on the boundary, where solutions may have power singularities.
This paper deals with Strauss and Lions-type theorems for fractional Sobolev spaces with variable exponent $W^{s,p(.),\tilde{p}(.,.)}(Ω)$, when $p$ and $\tilde{p}$ satisfies some conditions. As application, we study the existence of solutions for a class of Kirchhoff-Choquard problem in $\mathbb{R}^N$.
Higher Sobolev regularity for mixed local and nonlocal equations with nonstandard growth
本研究针对可模拟两类随机过程叠加的混合局部与非局部(p,q)-Laplace方程，开展其弱解内部Sobolev正则性的系统研究。
We give Hardy-Stein and Douglas identities for nonlinear nonlocal Sobolev-Bregman integral forms with unimodal Lévy measures. We prove that the corresponding Poisson integral defines an extension operator for the Sobolev-Bregman spaces. We also show that the Poisson integrals are quasiminimizers of the Sobolev-Bregman forms.
In this article, we consider mixed local and nonlocal Sobolev $(q,p)$-inequalities with extremal in the case $0<q<1<p<\infty$. We prove that the extremal of such inequalities is unique up to a multiplicative constant that is associated with a singular elliptic problem involving the mixed local and nonlocal $p$-Laplace operator. Moreover, it is proved that the mixed Sobolev inequalities are necessary and sufficient condition for the existence of weak solutions of such singular problems. As a consequence, a relation between the singular $p$-Laplace and mixed local and nonlocal $p$-Laplace equati…
Existence and uniqueness of solutions in fractional Orlicz-Sobolev spaces for a nonlocal singular elliptic problem
本文研究了一类带边界条件的奇异非线性椭圆问题，证明了其正解的存在性与唯一性，且该结果在分数阶 Orlicz-Sobolev 空间中成立。
On Fractional Anisotropic Musielak-Sobolev Spaces with Applications to Nonlocal Eigenvalue Problems
本文引入并研究分数阶各向异性Musielak-Sobolev空间，建立其基本性质与嵌入结果，将其应用于非局部各向异性特征值问题并证明特征值存在性，扩展并统一了相关现有模型。
Fine bounds for best constants of fractional subcritical Sobolev embeddings and applications to nonlocal PDEs
本文为分数次临界Sobolev嵌入建立了最佳常数的精细界，覆盖边界与极限情形，并应用于非局部PDE解的存在性与不存在性证明。
Nonlocal critical elliptic equations in homogeneous fractional Sobolev spaces
本文基于 ${\mathbb Z}_2$-上同调指标的抽象临界点定理、分数阶 $p$-Laplacian 方程的正则性结果与紧嵌入，证明了齐次分数阶 Sobolev 空间中非局部临界增长椭圆方程的多重性结果。
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。
Nonlocal problems with Hardy-Littlewood-Sobolev critical exponent and Hardy potential
本文研究了具有Hardy-Littlewood-Sobolev临界指数和Hardy势的非局部问题，通过变分方法获得存在性结果，并推导了非局部极小化问题的估计。
Sobolev regularity for the nonlocal $(1, p)$-Laplace equations in the superquadratic case
本文研究超二次情形下非局部$(1, p)$-Laplace方程弱解的内部Sobolev正则性，通过分析结构特征并结合有限差商法、尾部估计与Moser型迭代等技术，导出了弱解的显式Hölder连续性估计。
In this paper, we investigate the existence of weak solution for a fractional type problems driven by a nonlocal operator of elliptic type in a fractional Orlicz-Sobolev space, with homogeneous Dirichlet boundary conditions. We first extend the fractional Sobolev spaces $W^{s,p}$ to include the general case $W^sL_A$, where $A$ is an N-function and $s\in (0,1)$. We are concerned with some qualitative properties of the space $W^sL_A$ (completeness, reflexivity and separability). Moreover, we prove a continuous and compact embedding theorem of these spaces into Lebesgue spaces.
The effect of boundary geometry in nonlocal critical problems with Hardy-Littlewood-Sobolev exponent
本文研究了非局部临界问题中边界几何对基态解存在性的影响，考虑了Choquard非线性项和Hardy-Littlewood-Sobolev不等式意义下的上临界指数。
In this paper, we develop some properties of the $a_{x,y}(.)$-Neumann derivative for the fractional $a_{x,y}(.)$-Laplacian operator. Therefore we prove the basic proprieties of the correspondent function spaces. In the second part of this paper, by means of Ekeland's variational principal and direct variational approach, we prove the existence of weak solutions for a nonlocal problem with nonhomogeneous Neumann and Robin boundary condition.
Mixed Local-Nonlocal Equations in the Hyperbolic Space and Sharp Sobolev Constants
本文针对双曲空间中含混合局部-非局部算子的非线性椭圆方程，采用变分法研究次临界与临界非线性情形，证明了适当条件下弱解的存在性。
Nonlocal elliptic and parabolic equations with general stable operators in weighted Sobolev spaces
本文在加权Sobolev空间中研究$C^{1,τ}$开集上由对称稳定Lévy过程生成的非局部椭圆与抛物方程，允许Lévy测度高度奇异且时间变量仅可测，拓展了此类方程的可解性理论。
Fractional gradients and nonlocal PDEs in variable exponent spaces
本文在变指数Lebesgue空间中发展了Riesz分数阶梯度理论，引入非局部Sobolev空间，建立多种不等式和分数阶微积分基本定理，并应用于非线性变分问题，证明极小元存在性及Euler-Lagrange方程。
Mixed local and nonlocal weighted singular quasilinear elliptic problem and its associated Sobolev-type inequality
该研究针对一类混合各向异性与非局部奇异拟线性椭圆问题，采用单调逼近等方法证明弱解存在唯一性，刻画相关Sobolev型不等式最佳常数并证明其可达性，结果在p=2的混合加权拉普拉斯情形下为新成果。
We consider the minimizers of the energy $$ \|u\|_{H^s(Ω)}^2+\int_ΩW(u)\,dx,$$ with $s \in (0,1/2)$, where $\|u\|_{H^s(Ω)}$ denotes the total contribution from $Ω$ in the $H^s$ norm of $u$, and $W$ is a double-well potential. By using a fractional Sobolev inequality, we give a new proof of the fact that the sublevel sets of a minimizer $u$ in a large ball $B_R$ occupy a volume comparable with the volume of $B_R$.
Anisotropic fractional Sobolev spaces with variable exponent and application to nonlocal problems
本文引入具有变指数的分数阶各向异性Sobolev空间，建立其完备性、可分性、自反性及嵌入性质，证明各向异性分数阶$\vec{p}(.,.)$-Laplace算子的泛函性质，并利用山路定理和Ekeland变分原理证明非局部各向异性问题弱解的存在性。
We prove that the initial value problem associated to a nonlocal perturbation of the Benjamin-Ono equation is locally and globally well-posed in Sobolev spaces $H^s(\mathbb{R})$ for any $s>-3/2$ and we establish that our result is sharp in the sense that the flow map of this equation fails to be $C^2$ in $H^s(\mathbb{R})$ for $s<-3/2$. Finally, we study persistence properties of the solution flow in the weighted Sobolev spaces $Z_{s,r}=H^s(\mathbb{R})\cap L^2(|x|^{2r}\,dx)$ for $s\geq r >0$. We also prove some unique continuation properties of the solution flow in these spaces.
In this paper, we are going to investigate Cauchy problem for nonlocal nonlinear Schrödinger equation with the initial potential $q_0(x)$ in weighted sobolev space $H^{1,1}(\mathbb{R})$, \begin{align*} iq_t(x,t)&+q_{xx}(x,t)+2σq^2(x,t)\bar q(-x,t)=0,\quadσ=\pm1,\\ q(x,0)&=q_0(x). \end{align*} We show that the solution can be represented by the solution of a Riemann-Hilbert problem (RH problem), and assuming no discrete spectrum, we majorly apply $\bar\partial$-steepest cescent descent method on analyzing the long-time asymptotic behavior of it.
Nonlocal Choquard equations involving critical Hardy-Littlewood-Sobolev exponent: the effect of the topology of the domain
本文利用拓扑方法，在具有非平凡同调群的有界区域上证明了带Hardy-Littlewood-Sobolev上临界指标的非局部Choquard方程正解的存在性。
Unbounded operators corresponding to nonlocal elliptic problems on a bounded region $G\subset\mathbb R^2$ are considered. The domain of these operators consists of functions from the Sobolev space $W_2^m(G)$ being generalized solutions of the corresponding $2m$-order elliptic equation with right-hand side from $L_2(G)$ and satisfying homogeneous nonlocal boundary conditions. It is known that such unbounded operators have the Fredholm property. It is proved in the paper that low-order terms in the differential equation do not affect the index of the operator. Conditions under which nonlocal per…
In this paper, we investigate the existence of weak solution for a Kirchhoff type problem driven by a nonlocal operator of elliptic type in a fractional Orlicz-Sobolev space, with homogeneous Dirichlet boundary conditions {\small$$ (D_{K,A}) \hspace*{0.5cm} \left\{ \begin{array}{clclc} M\left( \displaystyle \int_{\R^{2N}}A\left( [u(x)-u(y)] K(x,y)\right) dxdy\right) \mathcal{L}^K_A u & = & f(x,u) & \text{ in }& Ω, \hspace*{7cm} u & = & 0 \hspace*{0.2cm} \hspace*{0.2cm} & \text{ in } & \R^N\setminus Ω. \label{eq1} \end{array} \right. $$ } Where $\mathcal{L}^K_A$ is a nonlocal operator with sing…
We consider the following nonlinear Choquard equation with Dirichlet boundary condition $$-Δu =\left(\int_Ω\frac{|u|^{2_μ^{\ast}}}{|x-y|^μ}dy\right)|u|^{2_μ^{\ast}-2}u+λf(u)\hspace{4.14mm}\mbox{in}\hspace{1.14mm} Ω, $$ where $Ω$ is a smooth bounded domain of $\mathbb{R}^N$, $λ>0$, $N\geq3$, $0<μ<N$ and $2_μ^{\ast}$ is the critical exponent in the sense of the Hardy-Littlewood-Sobolev inequality. Under suitable assumptions on different types of nonlinearities $f(u)$, we are able to prove some existence and multiplicity results for the equation by variational methods.
In this paper, we extend the fractional Sobolev spaces with variable exponents $W^{s,p(x,y)}$ to include the general fractional case $W^{K,p(x,y)}$, where $p$ is a variable exponent, $s\in (0,1)$ and $K$ is a suitable kernel. We are concerned with some qualitative properties of the space $W^{K,p(x,y)}$ (completeness, reflexivity, separability, and density). Moreover, we prove a continuous and compact embedding theorem of these spaces into variable exponent Lebesgue spaces. As applications, we discuss the existence of a nontrivial solution for a nonlocal $p(x,.)$-Kirchhoff type problem. Further…
In this paper, we establish that: Suppose a closed Riemannian manifold $(M^n,g_0)$ of dimension $\geq 8$ is not locally conformally flat, then the Paneitz-Sobolev constant of $M^n$ has the property that $q(g_0)<q(S^n)$. The analogy of this result was obtained by T. Aubin in 1976 and had been used to solve the Yamabe problem on closed manifolds. As an application, the above result can be used to recover the sequential convergence of the nonlocal Q-curvature flow on closed manifolds recently introduced by Gursky-Malchiodi.
In the first part of this article we deal with the existence of at least three non-trivial weak solutions of a nonlocal problem with nonstandard growth involving a nonlocal Robin type boundary condition. The second part of the article is devoted to study eigenvalues and minimizers of several nonlocal problems for the fractional $g-$Laplacian $(-Δ_g)^s$ with different boundary conditions, namely, Dirichlet, Neumann and Robin.
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。
On a Sobolev critical problem for the superposition of a local and nonlocal operator with the "wrong sign''
本文研究了由局部和非局部算子叠加形成的混合阶算子的临界问题，通过引入具有"错误符号"的分数拉普拉斯算子，实现了非平凡解的产生。
An eigenvalue problem for a nonlocal quasilinear anisotropic equation in fractional Orlicz Sobolev spaces without the $Δ_2$--condition
本文研究了一类非局部非标准生长扩散问题的特征值问题，不假设Young函数的Δ₂条件，证明了特征对序列(uk,λk)趋向于(0,+∞)的存在性。
In this paper we study the geometry of certain functionals associated to quasilinear elliptic boundary value problems with a degenerate nonlocal term of Kirchhoff type. Due to the degeneration of the nonlocal term it is not possible to directly use classical results such as uniform a-priori estimates and "Sobolev versus Hölder local minimizers" type of results. We prove that results similar to these hold true or not, depending on how degenerate the problem is. We apply our findings in order to show existence and multiplicity of solutions for the associated quasilinear equations, considering se…
We establish two new characterizations of magnetic Sobolev spaces for Lipschitz magnetic fields in terms of nonlocal functionals. The first one is related to the BBM formula, due to Bourgain, Brezis, and Mironescu. The second one is related to the work of the first author on the classical Sobolev spaces. We also study the convergence almost everywhere and the convergence in $L^1$ appearing naturally in these contexts.
In this work, we establish some abstract results on the perspective of the fractional Musielak-Sobolev spaces, such as: uniform convexity, Radon-Riesz property with respect to the modular function, $(S_{+})$-property, Brezis-Lieb type Lemma to the modular function and monotonicity results. Moreover, we apply the theory developed to study the existence of solutions to the following class of nonlocal problems \begin{equation*} \left\{ \begin{array}{ll} (-Δ)_{Φ_{x,y}}^s u = f(x,u),& \mbox{in }Ω, u=0,& \mbox{on }\mathbb{R}^N\setminus Ω, \end{array} \right. \end{equation*} where $N\geq 2$, $Ω\subse…
Nonlocal planar Schrödinger-Poisson systems in the fractional Sobolev limiting case
本文研究二维分数阶 Sobolev 极限情形下 Schrödinger-Poisson 系统的解的存在性与定性性质，通过辅助 Choquard 方程的变分逼近方法证明解存在，并利用移动平面技巧得到对称性与衰减结果。
This work is concerned with both higher integrability and differentiability for linear nonlocal equations with possibly very irregular coefficients of VMO-type or even coefficients that are merely small in BMO. In particular, such coefficients might be discontinuous. While for corresponding local elliptic equations with VMO coefficients such a gain of Sobolev regularity along the differentiability scale is unattainable, it was already observed in previous works that gaining differentiability in our nonlocal setting is possible under less restrictive assumptions than in the local setting. In th…
This article concerns about the existence and multiplicity of weak solutions for the following nonlinear doubly nonlocal problem with critical nonlinearity in the sense of Hardy-Littlewood-Sobolev inequality \begin{equation*} \left\{ \begin{split} (-Δ)^su &= λ|u|^{q-2}u + \left(\int_Ω\frac{|v(y)|^{2^*_μ}}{|x-y|^μ}~\mathrm{d}y\right) |u|^{2^*_μ-2}u\; \text{in}\; Ω (-Δ)^sv &= δ|v|^{q-2}v + \left(\int_{\Om}\frac{|u(y)|^{2^*_μ}}{|x-y|^μ}~\mathrm{d}y \right) |v|^{2^*_μ-2}v \; \text{in}\; Ω u &=v=0\; \text{in}\; \mb R^n\setminusΩ, \end{split} \right. \end{equation*} where $Ω$ is a smooth bounded dom…
In this note, we introduce a variant of Calderón and Zygmund's notion of $L^p$-differentiability - an \emph{$L^p$-Taylor approximation}. Our first result is that functions in the Sobolev space $W^{1,p}(\mathbb{R}^N)$ possess a first order $L^p$-Taylor approximation. This is in analogy with Calderón and Zygmund's result concerning the $L^p$-differentiability of Sobolev functions. In fact, the main result we announce here is that the first order $L^p$-Taylor approximation characterizes the Sobolev space $W^{1,p}(\mathbb{R}^N)$, and therefore implies $L^p$-differentiability. Our approach establis…
Nonlocal equations with degenerate weights
该研究引入带退化权的分数阶加权Sobolev空间，推导其嵌入与Poincaré不等式，证明对应非局部积分微分方程解的正则性，将经典结果推广到非线性非局部场景。
In this paper we use an algebraic topological argument due to Bahri and Coron to show how the topology of the domain influences the existence of positive solutions of some fourth order elliptic equation involving the critical Sobolev exponent.
Remainder terms of a nonlocal Sobolev inequality1
本文研究非局部Sobolev不等式，利用极值函数的非退化性质，证明了对所有0<α<N该不等式存在梯度型余项和弱L^{N/(N-2)}范数余项。
We study the removability of a singular set for elliptic equations involving weight functions and variable exponents. We consider the case where the singular set satisfies conditions related to some generalization of upper Minkowski content or a net measure, and give sufficient conditions for removability of this singularity for equations in the weighted variable exponent Sobolev spaces.
In this paper we study the Sobolev embedding theorem for variable exponent spaces with critical exponents. We find conditions on the best constant in order to guaranty the existence of extremals. The proof is based on a suitable refinement of the estimates in the Concentration--Compactness Theorem for variable exponents and an adaptation of a convexity argument due to P.L. Lions, F. Pacella and M. Tricarico.
In this paper, we study the existence of solutions for a critical time-harmonic Maxwell equation in nonlocal media. By introducing some suitable Coulomb spaces involving curl operator, we are able to obtain the ground state solutions of the curl-curl equation via the method of constraining Nehari-Pankov manifold. Correspondingly, some sharp constants of the Sobolev-like inequalities with curl operator are obtained by a nonlocal version of the concentration-compactness principle.
Relaxation of one-dimensional nonlocal supremal functionals in the Sobolev setting
本研究给出了Sobolev空间中非局部上确界泛函序列弱*下半连续的密度充要条件，并证明一维情形下其下半连续包络可通过密度的分别水平凸包络得到，丰富了变分法松弛理论。
The classical local Neumann problem is well studied and solutions of this problem lie, in general, in a Sobolev space. In this work, we focus on nonlocal Neumann problems with measurable, nonnegative kernels, whose solutions require less regularity assumptions. For kernels of this kind we formulate and study the weak formulation of the nonlocal Neumann problem and we investigate a nonlocal counterpart of the Sobolev space $H^{1}$ as well as a resulting nonlocal trace space. We further establish, mainly for symmetric kernels, various existence results for the weak solution of the Neumann proble…
Theory of capacities in fracional Sobolev spaces with variable exponents
本文发展了变指数分数阶 Sobolev 空间中的容度理论，研究了 Sobolev 容度与相对容度及其基本性质，并证明两者均为 Choquet 容度且所有 Borel 集可容。
In this study, we consider weighted stochastic field exponent function spaces $L_{\vartheta }^{p(.,.)}\left( D\times Ω\right) $ and $W_{\vartheta }^{k,p(.,.)}\left( D\times Ω\right) $. Also, we investigate some basic properties and embeddings of these spaces. Finally, we present an application of these spaces to the stochastic partial differential equations with stochastic field growth.
We show that a class of spaces of vector fields whose semi-norms involve the magnitude of "directional" difference quotients is in fact equivalent to the class of fractional Sobolev spaces. The equivalence can be considered a Korn-type characterization of fractional Sobolev spaces. We use the result to understand better the energy space associated to a strongly coupled system of nonlocal equations related to a nonlocal continuum model via peridynamics. Moreover, the equivalence permits us to apply classical space embeddings in proving that weak solutions to the nonlocal system enjoy both impro…
Nonlocal Schrödinger-Poisson systems in $\mathbb R^N$: the fractional Sobolev limiting case
本文研究全空间中非局部 Schrödinger-Poisson 系统在分数阶 Sobolev 极限情形下的正解存在性，通过变分逼近方法处理符号变化对数 Riesz 核带来的困难，并建立了解的对称性、正则性与衰减性。
Recovering functions via doubly homogeneous nonlocal gradients
本文研究在零和无穷远处具有不同齐次性的非局部梯度，为双齐次算子建立表示公式并推导 Sobolev 型不等式，同时提出受 Haim Brezis 工作启发的未来研究方向。
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