关于乘子的几个端点估计

In this paper,the author proves that Multiplier operator is bounded on BMO（Rⁿ）,LMO（Rⁿ） and CBMO^ρ,λ（Rⁿ）respectively if some concellation conditions are satisfied.     

Special John-Nirenberg-Campanato spaces via congruent cubes

Let p ∈ [1, ∞), q ∈ [1, ∞), α∈ R, and s be a non-negative integer. Inspired by the space JNp introduced by John and Nirenberg(1961) and the space B introduced by Bourgain et al.(2015), we introduce a special John-Nirenberg-Campanato space JN^con_(p,q,s) over Rⁿ or a given cube of R;with finite side length via congruent subcubes, which are of some amalgam features. The limit space of such spaces as p →∞ is just the Campanato space which coincides with the space BMO(the space of functions with bounded mean oscillations)when α = 0. Moreover, a vanishing subspace of this new space is introduced, and its equivalent characterization is established as well, which is a counterpart of the known characterization for the classical space VMO(the space of functions with vanishing mean oscillations) over Rⁿ or a given cube of Rⁿ with finite side length.Furthermore, some VMO-H¹-BMO-type results for this new space are also obtained, which are based on the aforementioned vanishing subspaces and the Hardy-type space defined via congruent cubes in this article. The geometrical properties of both the Euclidean space via its dyadic system and congruent cubes play a key role in the proofs of all these results.     

ISOMORPHISMS OF VARIABLE HARDY SPACES ASSOCIATED WITH SCHRÖDINGER OPERATORS

Let L:=-△+V be the Schrodinger operator on Rⁿwith n≥3,where V is a non-negative potential satisfying△^-1(V)∈L^∞(Rⁿ).Let w be an L-harmonic function,determined by V,satisfying that there exists a positive constantδsuch that,for any x∈Rn,0<δ≤w(x)≤1.Assume that p(·):Rⁿ→(0,1]is a variable exponent satisfying the globally log-H?lder continuous condition.In this article,the authors show that the mappings HL^p(·))(Rⁿ)■f■wf∈H^p(·)(Rⁿ)and HL^p(·)(Rⁿ)■f■(-△)^1/2L^-1/2(f)∈H^p(·)(Rⁿ)are isomorphisms between the variable Hardy spaces HL^p(·)(Rⁿ),associated with L,and the variable Hardy spaces H^p(·)(Rⁿ).     

Fourier transform of anisotropic mixed-norm Hardy spaces

Let a:=(a1,…,an)∈[1,∞)n,p:=(p1,…,pn)∈(0,1]n,Hpa(Rⁿ)be the anisotropic mixed-norm Hardy space associated with adefined via the radial maximal function,and let f belong to the Hardy space Hpa(Rⁿ).In this article,we show that the Fourier transform fcoincides with a continuous function g on?n in the sense of tempered distributions and,moreover,this continuous function g,multiplied by a step function associated with a,can be pointwisely controlled by a constant multiple of the Hardy space norm of f.These proofs are achieved via the known atomic characterization of Hpa(Rⁿ)and the establishment of two uniform estimates on anisotropic mixed-norm atoms.As applications,we also conclude a higher order convergence of the continuous function gat the origin.Finally,a variant of the Hardy-Littlewood inequality in the anisotropic mixed-norm Hardy space setting is also obtained.All these results are a natural generalization of the well-known corresponding conclusions of the classical Hardy spaces Hp(Rⁿ)with p∈0,1],and are even new for isotropic mixed-norm Hardy spaces on∈n.     

Dynamical behaviors of non-autonomous fractional FitzHugh-Nagumo system driven by additive noise in unbounded domains

The regularity of random attractors is considered for the non-autonomous fractional stochastic FitzHugh-Nagumo system.We prove that the system has a pullback random attractor that is compact in Hs(Rⁿ)×L²(Rⁿ)and attracts all tempered random sets of L²(Rⁿ)×L²(Rⁿ)in the topology of Hs(Rⁿ)×L²(Rⁿ)with s∈(0,1).By the idea of positive and negative truncations,spectral decomposition in bounded domains,and tail estimates,we achieved the desired results.     

一类关于波方程的振荡乘子在 Triebel-Lizorkin空间中的有界性

研究了与波方程的Cauchy问题相关的振荡乘子在Triebel-Lizorkin空间审F_p^γ,q（Rⁿ）中的有界性.     

带有分布导数的反应扩散方程在Rn中全局吸引子的存在性

该文考虑Rⁿ中一类带有加权项V(x)和分布导数的反应扩散方程解的长时间行为,证明了(L²(Rⁿ),L²(Rⁿ)∩L^p(Rⁿ))-全局吸引子的存在性;而且对任意的δ₁∈[0,+∞),该吸引子能够在L²∩L^p+δ₁-拓扑下吸引L²(Rⁿ)中的有界集.     

乘积型Morrey空间中乘积Hardy型算子的最佳界

本文得到了乘积Hardy型算子Hm在乘积Morrey空间L^q,λ(Rⁿ×…×Rⁿ)和齐次中心Morrey空间B^q,λ(Rⁿ×…×Rⁿ)上的算子范数.基于旋转方法,我们推广了傅尊伟等人的结果(见[Houston J.Math.,2012,38(1):225-244]).     

分数阶拉普拉斯算子指数非线性热方程的局部适定性解

本文研究了分数阶拉普拉斯算子指数非线性热方程的柯西问题.将expL₀^p_o(Rⁿ)中的初始条件分解成光滑部分和exp L^p(Rⁿ)中的很小部分,得到了Orlicz空间exp L^p(Rⁿ)中的局部适定性解.     

欧氏空间中升序变换半群的格林关系和正则元

设L(Rⁿ)表示n维欧氏空间Rn)表示n维欧氏空间Rⁿ的所有线性变换构成的集合,||α||表示向量α的欧氏长度,由欧氏长度建立起向量间的序关系.令:O+(Rn的所有线性变换构成的集合,||α||表示向量α的欧氏长度,由欧氏长度建立起向量间的序关系.令:O+(Rⁿ)={f∈L(Rn)={f∈L(Rⁿ)|(?)α∈Rn)|(?)α∈Rⁿ,||f(α)||≥||α||},则O+(Rn,||f(α)||≥||α||},则O+(Rⁿ)是欧氏空间Rn)是欧氏空间Rⁿ的所有升序变换构成的集合,其在交换的合成运算下构成一个半群,讨论了O+(Rn的所有升序变换构成的集合,其在交换的合成运算下构成一个半群,讨论了O+(Rⁿ)的格林关系和正则元.     

带非光滑核的奇异积分算子的交换子的加权BMO估计

研究了由BMO(ω)函数b和具有非光滑核的奇异积分算子T生成的交换子[b,T]的sharp极大函数的点态估计,证明了这类交换子是由L~p(μ)到L~q(v)上的有界算子,其中ω=(μv~(-1))~(1/p)且μ,v∈A_p,1相似文献   

高维Hausdorff算子在Hp(Rn)上的有界性

本文主要研究以下形式的Hausdorff算子H_Φf(x)=∫_RⁿΦ(u₁….,u_n)f(u₁x₁,…,u_nx_n)du₁…du_n,其中Φ是Rⁿ上的缓增分布.当n≥2,0Φ在H^p(Rⁿ)上有界当且仅当Φ≡0.进一步,当n≥2,n/n+1Φ有合适定义,那么H_Φ在H^p(Rⁿ)上有界当且仅当Φ是常数.这些结果都表明Hausdorff算子H_Φ在H^p(Rⁿ)上的有界性很复杂.此外,我们将H_Φ转化成卷积型算子,得到H_Φ在Lebesgue空间上有界的一些新的结果.     

Bochner-Riesz算子在加权Morrey空间上的一些估计

要本文将得到Bochner-Riesz算子T_R~((n-1)/2)在加权Morrey空间L~(p,k)(w)上的一些强型和弱型估计,1≤P<∞且0相似文献   

Molecular Characterization of Anisotropic Musielak–Orlicz Hardy Spaces and Their Applications

Let A be an expansive dilation on R~n and φ:R~n× [0,∞)→[0,∞) an anisotropic Musielak–Orlicz function.Let H_A~φ(R~n) be the anisotropic Hardy space of Musielak–Orlicz type defined via the grand maximal function.In this article,the authors establish its molecular characterization via the atomic characterization of H_A~φ(R~n).The molecules introduced in this article have the vanishing moments up to order s and the range of s in the isotropic case(namely,A:=2I_(n×n)) coincides with the range of well-known classical molecules and,moreover,even for the isotropic Hardy space H~p(R~n)with p∈(0,1](in this case,A:=2I_(n×n),φ(x,t) :=t~p for all x∈R~n and t∈[0,∞)),this molecular characterization is also new.As an application,the authors obtain the boundedness of anisotropic Calderón–Zygmund operators from H_A~φ(R~n) to L~φ(R~n) or from H_A~φ(R~n) to itself.     

几类具有粗糙核的算子在加权Morrey空间上的有界性

设Ω∈L~q(S~(n-1))且1相似文献   

强奇异Calderón-Zygmund算子的交换子的双权BMO估计

研究了由强奇异Calderón-Zygmund算子T和加权BMO（ω）函数b生成的交换子Tb的sharp极大函数的点态估计,证明了这类交换子是由L^[p]（μ）到LP（μ）到LP（υ）上的有界算子,其中ω=（μυ^[-1]）^[1/P]且μυ∈Ap,1〈P〈∞．     

Weighted norm inequalities for the commutators of multilinear singular integral operators

In this paper, the authors consider the weighted estimates for the commutators of multilinear Calderón-Zygmund operators.By introducing an operator which shifts the commutation, and establishing the weighted estimates for this new operator, the authors prove that, if p₁ ∈ （1,∞）, p₂,…,p_m ∈(1,∞], p ∈ （0,∞） with 1/p =Σ1≤k≤ m 1/pk, then for any weight w, the commutators of m-linear Galderón-Zygmund operator are bounded from L^P1（Rⁿ,M_l（logL）^σw）× p2（Rn,M^w）×...×Lpm（Rn,Mw） to Lp（Rn,w）with σ to be a constant depending only on p₁ and the order of commutator     

一类积分方程组正解的对称性和单调性

本文讨论积分方程组（？）解的性质,其中G_α是α阶贝塞尔位势核,0≤β〈α（n-α＋β）/n,1/（q＋1）＋1/（r＋1）〉（n-α＋β）/n,1/（r＋1）＋1/（p＋1）〉（n-α＋β）/n.我们用积分形式的移动平面法证明上述积分方程组的正解是径向对称且单调的.     

带多项式相位的高维振荡积分算子的有界性

考虑如下的振荡积分算子:T_(m,k,n)f(x):=∫_(R~n)e~(i(x_1~2+…+x_n~2))~m(y_1~2+…+y_n~2)~kf(y)dy,其中函数f为定义在R~n上的Schwartz函数,并且满足m,k0.本文给出算子T_(m,k,n).从L~p(R~n)(1≤p∞)到L~q(R~n)有界的一个充分必要条件.此外,我们还证明了算子T_(m,k,n)把L~1(R~n)映到C_0(R~n).     

向量值哈代-洛伦茨空间

对于1r∞与巴拿哈空间B=L~r(Ω,F,μ),我们研究了欧几里得空间R~n上B-值缓分布构成的哈代-洛伦茨空间H~(p,q)(R~n,B)及哈代-洛伦茨空间之间的内插,其中0p∞和0q≤∞,获得了H~(p,q)(R~n,B)的一系列等价的刻画及其原子分解.若Ω={1},则H~(p,q)(R~n,B)=H~(p,q)(R~n)是经典的情形;若Ω=Z是整数集且μ是Z上的计数测度并且r=2,0p∞及q=∞,则H~(p,q)(R~n,B)=H~(p,∞)(R~n,e~2)转化为Grafakos和He在文[Weak Hardy spaces,Preprint,2014]中讨论的情形.