English

Banach space valued $H^p$ spaces with $A_p$ weight

Functional Analysis 2023-01-06 v3 Classical Analysis and ODEs

Abstract

In this research we introduce the Banach space valued HpH^p spaces with ApA_p weight, and prove the following results: Let A\mathbb{A} and B\mathbb{B} Banach spaces, and TT be a convolution operator mapping A\mathbb{A}-valued functions into B\mathbb{B}-valued functions, i.e., Tf(x)=RnK(xy)f(y)dy,Tf(x)=\int_{\mathbb{R}^n}K(x-y)\cdot f(y)\, dy, where KK is a strongly measurable function defined on Rn\mathbb{R}^n such that K(x)B\|K(x)\|_{\mathbb{B}} is locally integrable away from the origin. Suppose that ww is a positive weight function defined on Rn\mathbb{R}^n, and that i) For some q[1,]q\in [1, \infty ], there exists a positive constant C1C_1 such that RnTf(x)Bqw(x)dxC1Rnf(x)Aqw(x)dx\int_{\mathbb{R}^n}\|Tf(x)\|^q_{\mathbb{B}}w(x)\, dx\leq C_1\int_{\mathbb{R}^n}\|f(x)\|_{\mathbb{A}}^q w(x)\,dx for all fLAq(Rn)f\in L^q_{\mathbb{A}}(\mathbb{R}^n). ii) There exists a positive constant C2C_2 independent of yRny\in\mathbb{R}^n such that x>2yK(xy)K(x)Bdx<C2.\int_{|x|>2|y|}\|K(x-y)-K(x)\|_{\mathbb{B}}\, dx<C_2. Then there exists a positive constant C3C_3 such that TfLB1(w)C3fHA1(w)\|Tf\|_{L^1_{\mathbb{B}}(w)}\leq C_3\|f\|_{H^1_{\mathbb{A}}(w)} for all fHA1(w)f\in H^1_{\mathbb{A}}(w). Let wA1w\in A_1. Assume that KLloc(Rn\{0})K\in L_{\rm{loc}}(\mathbb{R}^n\backslash \{0\}) satisfies KfLB2(w)C1fLA2(w)\|K\ast f\|_{L^2_{\mathbb{B}}(w)}\leq C_1\|f\|_{L^2_{\mathbb{A}}(w)} and xC2yK(xy)K(x)Bw(x+h)dxC3w(y+h)      (y0,hRn)\int_{|x|\geq C_2|y|}\|K(x-y)-K(x)\|_{\mathbb{B}}w(x+h)\, dx\leq C_3w(y+h)\;\;\;(\forall y\neq 0, \forall h\in\mathbb{R}^n) for certain absolute constants C1C_1, C2C_2, and C3C_3. Then there exists a positive constant CC independent of ff such that KfLB1(w)CfHA1(w)\|K\ast f\|_{L^1_{\mathbb{B}}(w)}\leq C\|f\|_{H^1_{\mathbb{A}}(w)} for all fHA1(w)f\in H^1_{\mathbb{A}}(w).

Keywords

Cite

@article{arxiv.2209.04033,
  title  = {Banach space valued $H^p$ spaces with $A_p$ weight},
  author = {Sakin Demir},
  journal= {arXiv preprint arXiv:2209.04033},
  year   = {2023}
}
R2 v1 2026-06-28T00:59:04.554Z